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Andrew Geisslerc9f78652020-09-18 14:11:35 -05002
3******************
4Variables Glossary
5******************
6
7This chapter lists common variables used in the OpenEmbedded build
8system and gives an overview of their function and contents.
9
Andrew Geisslerf0343792020-11-18 10:42:21 -060010:term:`A <ABIEXTENSION>` :term:`B` :term:`C <CACHE>`
11:term:`D` :term:`E <EFI_PROVIDER>` :term:`F <FEATURE_PACKAGES>`
12:term:`G <GCCPIE>` :term:`H <HOMEPAGE>` :term:`I <ICECC_DISABLED>`
13:term:`K <KARCH>` :term:`L <LABELS>` :term:`M <MACHINE>`
14:term:`N <NATIVELSBSTRING>` :term:`O <OBJCOPY>` :term:`P`
15:term:`R <RANLIB>` :term:`S` :term:`T`
16:term:`U <UBOOT_CONFIG>` :term:`V <VOLATILE_LOG_DIR>`
17:term:`W <WARN_QA>` :term:`X <XSERVER>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -050018
19.. glossary::
20
Andrew Geisslerf0343792020-11-18 10:42:21 -060021 :term:`ABIEXTENSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -050022 Extension to the Application Binary Interface (ABI) field of the GNU
23 canonical architecture name (e.g. "eabi").
24
25 ABI extensions are set in the machine include files. For example, the
26 ``meta/conf/machine/include/arm/arch-arm.inc`` file sets the
27 following extension:
28 ::
29
30 ABIEXTENSION = "eabi"
31
Andrew Geisslerf0343792020-11-18 10:42:21 -060032 :term:`ALLOW_EMPTY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -050033 Specifies whether to produce an output package even if it is empty.
34 By default, BitBake does not produce empty packages. This default
35 behavior can cause issues when there is an
36 :term:`RDEPENDS` or some other hard runtime
37 requirement on the existence of the package.
38
39 Like all package-controlling variables, you must always use them in
40 conjunction with a package name override, as in:
41 ::
42
43 ALLOW_EMPTY_${PN} = "1"
44 ALLOW_EMPTY_${PN}-dev = "1"
45 ALLOW_EMPTY_${PN}-staticdev = "1"
46
Andrew Geisslerf0343792020-11-18 10:42:21 -060047 :term:`ALTERNATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -050048 Lists commands in a package that need an alternative binary naming
49 scheme. Sometimes the same command is provided in multiple packages.
50 When this occurs, the OpenEmbedded build system needs to use the
51 alternatives system to create a different binary naming scheme so the
52 commands can co-exist.
53
54 To use the variable, list out the package's commands that also exist
55 as part of another package. For example, if the ``busybox`` package
56 has four commands that also exist as part of another package, you
57 identify them as follows:
58 ::
59
60 ALTERNATIVE_busybox = "sh sed test bracket"
61
62 For more information on the alternatives system, see the
63 ":ref:`update-alternatives.bbclass <ref-classes-update-alternatives>`"
64 section.
65
Andrew Geisslerf0343792020-11-18 10:42:21 -060066 :term:`ALTERNATIVE_LINK_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -050067 Used by the alternatives system to map duplicated commands to actual
68 locations. For example, if the ``bracket`` command provided by the
69 ``busybox`` package is duplicated through another package, you must
70 use the ``ALTERNATIVE_LINK_NAME`` variable to specify the actual
71 location:
72 ::
73
74 ALTERNATIVE_LINK_NAME[bracket] = "/usr/bin/["
75
76 In this example, the binary for the ``bracket`` command (i.e. ``[``)
77 from the ``busybox`` package resides in ``/usr/bin/``.
78
79 .. note::
80
Andrew Geissler4c19ea12020-10-27 13:52:24 -050081 If ``ALTERNATIVE_LINK_NAME`` is not defined, it defaults to ``${bindir}/name``.
Andrew Geisslerc9f78652020-09-18 14:11:35 -050082
83 For more information on the alternatives system, see the
84 ":ref:`update-alternatives.bbclass <ref-classes-update-alternatives>`"
85 section.
86
Andrew Geisslerf0343792020-11-18 10:42:21 -060087 :term:`ALTERNATIVE_PRIORITY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -050088 Used by the alternatives system to create default priorities for
89 duplicated commands. You can use the variable to create a single
90 default regardless of the command name or package, a default for
91 specific duplicated commands regardless of the package, or a default
92 for specific commands tied to particular packages. Here are the
93 available syntax forms:
94 ::
95
96 ALTERNATIVE_PRIORITY = "priority"
97 ALTERNATIVE_PRIORITY[name] = "priority"
98 ALTERNATIVE_PRIORITY_pkg[name] = "priority"
99
100 For more information on the alternatives system, see the
101 ":ref:`update-alternatives.bbclass <ref-classes-update-alternatives>`"
102 section.
103
Andrew Geisslerf0343792020-11-18 10:42:21 -0600104 :term:`ALTERNATIVE_TARGET`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500105 Used by the alternatives system to create default link locations for
106 duplicated commands. You can use the variable to create a single
107 default location for all duplicated commands regardless of the
108 command name or package, a default for specific duplicated commands
109 regardless of the package, or a default for specific commands tied to
110 particular packages. Here are the available syntax forms:
111 ::
112
113 ALTERNATIVE_TARGET = "target"
114 ALTERNATIVE_TARGET[name] = "target"
115 ALTERNATIVE_TARGET_pkg[name] = "target"
116
117 .. note::
118
119 If ``ALTERNATIVE_TARGET`` is not defined, it inherits the value
120 from the :term:`ALTERNATIVE_LINK_NAME` variable.
121
122 If ``ALTERNATIVE_LINK_NAME`` and ``ALTERNATIVE_TARGET`` are the
123 same, the target for ``ALTERNATIVE_TARGET`` has "``.{BPN}``"
124 appended to it.
125
126 Finally, if the file referenced has not been renamed, the
127 alternatives system will rename it to avoid the need to rename
128 alternative files in the :ref:`ref-tasks-install`
129 task while retaining support for the command if necessary.
130
131 For more information on the alternatives system, see the
132 ":ref:`update-alternatives.bbclass <ref-classes-update-alternatives>`"
133 section.
134
Andrew Geissler6ce62a22020-11-30 19:58:47 -0600135 :term:`ANY_OF_DISTRO_FEATURES`
136 When inheriting the
137 :ref:`features_check <ref-classes-features_check>`
138 class, this variable identifies a list of distribution features where
139 at least one must be enabled in the current configuration in order
140 for the OpenEmbedded build system to build the recipe. In other words,
141 if none of the features listed in ``ANY_OF_DISTRO_FEATURES``
142 appear in ``DISTRO_FEATURES`` within the current configuration, then
143 the recipe will be skipped, and if the build system attempts to build
144 the recipe then an error will be triggered.
145
146
Andrew Geisslerf0343792020-11-18 10:42:21 -0600147 :term:`APPEND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500148 An override list of append strings for each target specified with
149 :term:`LABELS`.
150
151 See the :ref:`grub-efi <ref-classes-grub-efi>` class for more
152 information on how this variable is used.
153
Andrew Geisslerf0343792020-11-18 10:42:21 -0600154 :term:`AR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500155 The minimal command and arguments used to run ``ar``.
156
Andrew Geisslerf0343792020-11-18 10:42:21 -0600157 :term:`ARCHIVER_MODE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500158 When used with the :ref:`archiver <ref-classes-archiver>` class,
159 determines the type of information used to create a released archive.
160 You can use this variable to create archives of patched source,
161 original source, configured source, and so forth by employing the
162 following variable flags (varflags):
163 ::
164
165 ARCHIVER_MODE[src] = "original" # Uses original (unpacked) source files.
166 ARCHIVER_MODE[src] = "patched" # Uses patched source files. This is the default.
167 ARCHIVER_MODE[src] = "configured" # Uses configured source files.
168 ARCHIVER_MODE[diff] = "1" # Uses patches between do_unpack and do_patch.
169 ARCHIVER_MODE[diff-exclude] ?= "file file ..." # Lists files and directories to exclude from diff.
170 ARCHIVER_MODE[dumpdata] = "1" # Uses environment data.
171 ARCHIVER_MODE[recipe] = "1" # Uses recipe and include files.
172 ARCHIVER_MODE[srpm] = "1" # Uses RPM package files.
173
174 For information on how the variable works, see the
175 ``meta/classes/archiver.bbclass`` file in the :term:`Source Directory`.
176
Andrew Geisslerf0343792020-11-18 10:42:21 -0600177 :term:`AS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500178 Minimal command and arguments needed to run the assembler.
179
Andrew Geisslerf0343792020-11-18 10:42:21 -0600180 :term:`ASSUME_PROVIDED`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500181 Lists recipe names (:term:`PN` values) BitBake does not
182 attempt to build. Instead, BitBake assumes these recipes have already
183 been built.
184
185 In OpenEmbedded-Core, ``ASSUME_PROVIDED`` mostly specifies native
186 tools that should not be built. An example is ``git-native``, which
187 when specified, allows for the Git binary from the host to be used
188 rather than building ``git-native``.
189
Andrew Geisslerf0343792020-11-18 10:42:21 -0600190 :term:`ASSUME_SHLIBS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500191 Provides additional ``shlibs`` provider mapping information, which
192 adds to or overwrites the information provided automatically by the
193 system. Separate multiple entries using spaces.
194
195 As an example, use the following form to add an ``shlib`` provider of
196 shlibname in packagename with the optional version:
197 ::
198
199 shlibname:packagename[_version]
200
201 Here is an example that adds a shared library named ``libEGL.so.1``
202 as being provided by the ``libegl-implementation`` package:
203 ::
204
205 ASSUME_SHLIBS = "libEGL.so.1:libegl-implementation"
206
Andrew Geisslerf0343792020-11-18 10:42:21 -0600207 :term:`AUTHOR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500208 The email address used to contact the original author or authors in
209 order to send patches and forward bugs.
210
Andrew Geisslerf0343792020-11-18 10:42:21 -0600211 :term:`AUTO_LIBNAME_PKGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500212 When the :ref:`debian <ref-classes-debian>` class is inherited,
213 which is the default behavior, ``AUTO_LIBNAME_PKGS`` specifies which
214 packages should be checked for libraries and renamed according to
215 Debian library package naming.
216
217 The default value is "${PACKAGES}", which causes the debian class to
218 act on all packages that are explicitly generated by the recipe.
219
Andrew Geisslerf0343792020-11-18 10:42:21 -0600220 :term:`AUTO_SYSLINUXMENU`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500221 Enables creating an automatic menu for the syslinux bootloader. You
222 must set this variable in your recipe. The
223 :ref:`syslinux <ref-classes-syslinux>` class checks this variable.
224
Andrew Geisslerf0343792020-11-18 10:42:21 -0600225 :term:`AUTOREV`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500226 When ``SRCREV`` is set to the value of this variable, it specifies to
227 use the latest source revision in the repository. Here is an example:
228 ::
229
230 SRCREV = "${AUTOREV}"
231
232 If you use the previous statement to retrieve the latest version of
233 software, you need to be sure :term:`PV` contains
234 ``${``\ :term:`SRCPV`\ ``}``. For example, suppose you
235 have a kernel recipe that inherits the
236 :ref:`kernel <ref-classes-kernel>` class and you use the previous
237 statement. In this example, ``${SRCPV}`` does not automatically get
238 into ``PV``. Consequently, you need to change ``PV`` in your recipe
239 so that it does contain ``${SRCPV}``.
240
241 For more information see the
Andrew Geissler09209ee2020-12-13 08:44:15 -0600242 ":ref:`dev-manual/common-tasks:automatically incrementing a package version number`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500243 section in the Yocto Project Development Tasks Manual.
244
Andrew Geisslerf0343792020-11-18 10:42:21 -0600245 :term:`AVAILABLE_LICENSES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500246 List of licenses found in the directories specified by
247 :term:`COMMON_LICENSE_DIR` and
248 :term:`LICENSE_PATH`.
249
250 .. note::
251
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500252 It is assumed that all changes to ``COMMON_LICENSE_DIR`` and
253 ``LICENSE_PATH`` have been done before ``AVAILABLE_LICENSES``
254 is defined (in :ref:`ref-classes-license`).
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500255
Andrew Geisslerf0343792020-11-18 10:42:21 -0600256 :term:`AVAILTUNES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500257 The list of defined CPU and Application Binary Interface (ABI)
258 tunings (i.e. "tunes") available for use by the OpenEmbedded build
259 system.
260
261 The list simply presents the tunes that are available. Not all tunes
262 may be compatible with a particular machine configuration, or with
263 each other in a
Andrew Geissler09209ee2020-12-13 08:44:15 -0600264 :ref:`Multilib <dev-manual/common-tasks:combining multiple versions of library files into one image>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500265 configuration.
266
267 To add a tune to the list, be sure to append it with spaces using the
268 "+=" BitBake operator. Do not simply replace the list by using the
269 "=" operator. See the
270 ":ref:`Basic Syntax <bitbake:bitbake-user-manual/bitbake-user-manual-metadata:basic syntax>`" section in the BitBake
271 User Manual for more information.
272
Andrew Geisslerf0343792020-11-18 10:42:21 -0600273 :term:`B`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500274 The directory within the :term:`Build Directory` in
275 which the OpenEmbedded build system places generated objects during a
276 recipe's build process. By default, this directory is the same as the
277 :term:`S` directory, which is defined as:
278 ::
279
280 S = "${WORKDIR}/${BP}"
281
282 You can separate the (``S``) directory and the directory pointed to
283 by the ``B`` variable. Most Autotools-based recipes support
284 separating these directories. The build system defaults to using
285 separate directories for ``gcc`` and some kernel recipes.
286
Andrew Geisslerf0343792020-11-18 10:42:21 -0600287 :term:`BAD_RECOMMENDATIONS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500288 Lists "recommended-only" packages to not install. Recommended-only
289 packages are packages installed only through the
290 :term:`RRECOMMENDS` variable. You can prevent any
291 of these "recommended" packages from being installed by listing them
292 with the ``BAD_RECOMMENDATIONS`` variable:
293 ::
294
295 BAD_RECOMMENDATIONS = "package_name package_name package_name ..."
296
297 You can set this variable globally in your ``local.conf`` file or you
298 can attach it to a specific image recipe by using the recipe name
299 override:
300 ::
301
302 BAD_RECOMMENDATIONS_pn-target_image = "package_name"
303
304 It is important to realize that if you choose to not install packages
305 using this variable and some other packages are dependent on them
306 (i.e. listed in a recipe's :term:`RDEPENDS`
307 variable), the OpenEmbedded build system ignores your request and
308 will install the packages to avoid dependency errors.
309
310 Support for this variable exists only when using the IPK and RPM
311 packaging backend. Support does not exist for DEB.
312
313 See the :term:`NO_RECOMMENDATIONS` and the
314 :term:`PACKAGE_EXCLUDE` variables for related
315 information.
316
Andrew Geisslerf0343792020-11-18 10:42:21 -0600317 :term:`BASE_LIB`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500318 The library directory name for the CPU or Application Binary
319 Interface (ABI) tune. The ``BASE_LIB`` applies only in the Multilib
Andrew Geissler09209ee2020-12-13 08:44:15 -0600320 context. See the ":ref:`dev-manual/common-tasks:combining multiple versions of library files into one image`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500321 section in the Yocto Project Development Tasks Manual for information
322 on Multilib.
323
324 The ``BASE_LIB`` variable is defined in the machine include files in
325 the :term:`Source Directory`. If Multilib is not
326 being used, the value defaults to "lib".
327
Andrew Geisslerf0343792020-11-18 10:42:21 -0600328 :term:`BASE_WORKDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500329 Points to the base of the work directory for all recipes. The default
330 value is "${TMPDIR}/work".
331
Andrew Geisslerf0343792020-11-18 10:42:21 -0600332 :term:`BB_ALLOWED_NETWORKS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500333 Specifies a space-delimited list of hosts that the fetcher is allowed
334 to use to obtain the required source code. Following are
335 considerations surrounding this variable:
336
337 - This host list is only used if ``BB_NO_NETWORK`` is either not set
338 or set to "0".
339
340 - Limited support for wildcard matching against the beginning of
341 host names exists. For example, the following setting matches
342 ``git.gnu.org``, ``ftp.gnu.org``, and ``foo.git.gnu.org``.
343 ::
344
345 BB_ALLOWED_NETWORKS = "*.gnu.org"
346
347 .. note::
348
349 The use of the "``*``" character only works at the beginning of
350 a host name and it must be isolated from the remainder of the
351 host name. You cannot use the wildcard character in any other
352 location of the name or combined with the front part of the
353 name.
354
355 For example, ``*.foo.bar`` is supported, while ``*aa.foo.bar``
356 is not.
357
358 - Mirrors not in the host list are skipped and logged in debug.
359
360 - Attempts to access networks not in the host list cause a failure.
361
362 Using ``BB_ALLOWED_NETWORKS`` in conjunction with
363 :term:`PREMIRRORS` is very useful. Adding the host
364 you want to use to ``PREMIRRORS`` results in the source code being
365 fetched from an allowed location and avoids raising an error when a
366 host that is not allowed is in a :term:`SRC_URI`
367 statement. This is because the fetcher does not attempt to use the
368 host listed in ``SRC_URI`` after a successful fetch from the
369 ``PREMIRRORS`` occurs.
370
Andrew Geisslerf0343792020-11-18 10:42:21 -0600371 :term:`BB_DANGLINGAPPENDS_WARNONLY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500372 Defines how BitBake handles situations where an append file
373 (``.bbappend``) has no corresponding recipe file (``.bb``). This
374 condition often occurs when layers get out of sync (e.g. ``oe-core``
375 bumps a recipe version and the old recipe no longer exists and the
376 other layer has not been updated to the new version of the recipe
377 yet).
378
379 The default fatal behavior is safest because it is the sane reaction
380 given something is out of sync. It is important to realize when your
381 changes are no longer being applied.
382
383 You can change the default behavior by setting this variable to "1",
384 "yes", or "true" in your ``local.conf`` file, which is located in the
385 :term:`Build Directory`: Here is an example:
386 ::
387
388 BB_DANGLINGAPPENDS_WARNONLY = "1"
389
Andrew Geisslerf0343792020-11-18 10:42:21 -0600390 :term:`BB_DISKMON_DIRS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500391 Monitors disk space and available inodes during the build and allows
392 you to control the build based on these parameters.
393
394 Disk space monitoring is disabled by default. To enable monitoring,
395 add the ``BB_DISKMON_DIRS`` variable to your ``conf/local.conf`` file
396 found in the :term:`Build Directory`. Use the
397 following form:
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500398
399 .. code-block:: none
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500400
401 BB_DISKMON_DIRS = "action,dir,threshold [...]"
402
403 where:
404
405 action is:
406 ABORT: Immediately abort the build when
407 a threshold is broken.
408 STOPTASKS: Stop the build after the currently
409 executing tasks have finished when
410 a threshold is broken.
411 WARN: Issue a warning but continue the
412 build when a threshold is broken.
413 Subsequent warnings are issued as
414 defined by the BB_DISKMON_WARNINTERVAL
415 variable, which must be defined in
416 the conf/local.conf file.
417
418 dir is:
419 Any directory you choose. You can specify one or
420 more directories to monitor by separating the
421 groupings with a space. If two directories are
422 on the same device, only the first directory
423 is monitored.
424
425 threshold is:
426 Either the minimum available disk space,
427 the minimum number of free inodes, or
428 both. You must specify at least one. To
429 omit one or the other, simply omit the value.
430 Specify the threshold using G, M, K for Gbytes,
431 Mbytes, and Kbytes, respectively. If you do
432 not specify G, M, or K, Kbytes is assumed by
433 default. Do not use GB, MB, or KB.
434
435 Here are some examples:
436 ::
437
438 BB_DISKMON_DIRS = "ABORT,${TMPDIR},1G,100K WARN,${SSTATE_DIR},1G,100K"
439 BB_DISKMON_DIRS = "STOPTASKS,${TMPDIR},1G"
440 BB_DISKMON_DIRS = "ABORT,${TMPDIR},,100K"
441
442 The first example works only if you also provide the
443 :term:`BB_DISKMON_WARNINTERVAL`
444 variable in the ``conf/local.conf``. This example causes the build
445 system to immediately abort when either the disk space in
446 ``${TMPDIR}`` drops below 1 Gbyte or the available free inodes drops
447 below 100 Kbytes. Because two directories are provided with the
448 variable, the build system also issue a warning when the disk space
449 in the ``${SSTATE_DIR}`` directory drops below 1 Gbyte or the number
450 of free inodes drops below 100 Kbytes. Subsequent warnings are issued
451 during intervals as defined by the ``BB_DISKMON_WARNINTERVAL``
452 variable.
453
454 The second example stops the build after all currently executing
455 tasks complete when the minimum disk space in the ``${TMPDIR}``
456 directory drops below 1 Gbyte. No disk monitoring occurs for the free
457 inodes in this case.
458
459 The final example immediately aborts the build when the number of
460 free inodes in the ``${TMPDIR}`` directory drops below 100 Kbytes. No
461 disk space monitoring for the directory itself occurs in this case.
462
Andrew Geisslerf0343792020-11-18 10:42:21 -0600463 :term:`BB_DISKMON_WARNINTERVAL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500464 Defines the disk space and free inode warning intervals. To set these
465 intervals, define the variable in your ``conf/local.conf`` file in
466 the :term:`Build Directory`.
467
468 If you are going to use the ``BB_DISKMON_WARNINTERVAL`` variable, you
469 must also use the :term:`BB_DISKMON_DIRS`
470 variable and define its action as "WARN". During the build,
471 subsequent warnings are issued each time disk space or number of free
472 inodes further reduces by the respective interval.
473
474 If you do not provide a ``BB_DISKMON_WARNINTERVAL`` variable and you
475 do use ``BB_DISKMON_DIRS`` with the "WARN" action, the disk
476 monitoring interval defaults to the following:
477 ::
478
479 BB_DISKMON_WARNINTERVAL = "50M,5K"
480
481 When specifying the variable in your configuration file, use the
482 following form:
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500483
484 .. code-block:: none
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500485
486 BB_DISKMON_WARNINTERVAL = "disk_space_interval,disk_inode_interval"
487
488 where:
489
490 disk_space_interval is:
491 An interval of memory expressed in either
492 G, M, or K for Gbytes, Mbytes, or Kbytes,
493 respectively. You cannot use GB, MB, or KB.
494
495 disk_inode_interval is:
496 An interval of free inodes expressed in either
497 G, M, or K for Gbytes, Mbytes, or Kbytes,
498 respectively. You cannot use GB, MB, or KB.
499
500 Here is an example:
501 ::
502
503 BB_DISKMON_DIRS = "WARN,${SSTATE_DIR},1G,100K"
504 BB_DISKMON_WARNINTERVAL = "50M,5K"
505
506 These variables cause the
507 OpenEmbedded build system to issue subsequent warnings each time the
508 available disk space further reduces by 50 Mbytes or the number of
509 free inodes further reduces by 5 Kbytes in the ``${SSTATE_DIR}``
510 directory. Subsequent warnings based on the interval occur each time
511 a respective interval is reached beyond the initial warning (i.e. 1
512 Gbytes and 100 Kbytes).
513
Andrew Geisslerf0343792020-11-18 10:42:21 -0600514 :term:`BB_GENERATE_MIRROR_TARBALLS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500515 Causes tarballs of the source control repositories (e.g. Git
516 repositories), including metadata, to be placed in the
517 :term:`DL_DIR` directory.
518
519 For performance reasons, creating and placing tarballs of these
520 repositories is not the default action by the OpenEmbedded build
521 system.
522 ::
523
524 BB_GENERATE_MIRROR_TARBALLS = "1"
525
526 Set this variable in your
527 ``local.conf`` file in the :term:`Build Directory`.
528
529 Once you have the tarballs containing your source files, you can
530 clean up your ``DL_DIR`` directory by deleting any Git or other
531 source control work directories.
532
Andrew Geisslerf0343792020-11-18 10:42:21 -0600533 :term:`BB_NUMBER_THREADS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500534 The maximum number of tasks BitBake should run in parallel at any one
535 time. The OpenEmbedded build system automatically configures this
536 variable to be equal to the number of cores on the build system. For
537 example, a system with a dual core processor that also uses
538 hyper-threading causes the ``BB_NUMBER_THREADS`` variable to default
539 to "4".
540
541 For single socket systems (i.e. one CPU), you should not have to
542 override this variable to gain optimal parallelism during builds.
543 However, if you have very large systems that employ multiple physical
544 CPUs, you might want to make sure the ``BB_NUMBER_THREADS`` variable
545 is not set higher than "20".
546
547 For more information on speeding up builds, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -0600548 ":ref:`dev-manual/common-tasks:speeding up a build`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500549 section in the Yocto Project Development Tasks Manual.
550
Andrew Geisslerf0343792020-11-18 10:42:21 -0600551 :term:`BB_SERVER_TIMEOUT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500552 Specifies the time (in seconds) after which to unload the BitBake
553 server due to inactivity. Set ``BB_SERVER_TIMEOUT`` to determine how
554 long the BitBake server stays resident between invocations.
555
556 For example, the following statement in your ``local.conf`` file
557 instructs the server to be unloaded after 20 seconds of inactivity:
558 ::
559
560 BB_SERVER_TIMEOUT = "20"
561
562 If you want the server to never be unloaded,
563 set ``BB_SERVER_TIMEOUT`` to "-1".
564
Andrew Geisslerf0343792020-11-18 10:42:21 -0600565 :term:`BBCLASSEXTEND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500566 Allows you to extend a recipe so that it builds variants of the
567 software. Common variants for recipes exist such as "natives" like
568 ``quilt-native``, which is a copy of Quilt built to run on the build
569 system; "crosses" such as ``gcc-cross``, which is a compiler built to
570 run on the build machine but produces binaries that run on the target
571 :term:`MACHINE`; "nativesdk", which targets the SDK
572 machine instead of ``MACHINE``; and "mulitlibs" in the form
573 "``multilib:``\ multilib_name".
574
575 To build a different variant of the recipe with a minimal amount of
576 code, it usually is as simple as adding the following to your recipe:
577 ::
578
579 BBCLASSEXTEND =+ "native nativesdk"
580 BBCLASSEXTEND =+ "multilib:multilib_name"
581
582 .. note::
583
584 Internally, the ``BBCLASSEXTEND`` mechanism generates recipe
585 variants by rewriting variable values and applying overrides such
586 as ``_class-native``. For example, to generate a native version of
587 a recipe, a :term:`DEPENDS` on "foo" is rewritten
588 to a ``DEPENDS`` on "foo-native".
589
590 Even when using ``BBCLASSEXTEND``, the recipe is only parsed once.
591 Parsing once adds some limitations. For example, it is not
592 possible to include a different file depending on the variant,
593 since ``include`` statements are processed when the recipe is
594 parsed.
595
Andrew Geisslerf0343792020-11-18 10:42:21 -0600596 :term:`BBFILE_COLLECTIONS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500597 Lists the names of configured layers. These names are used to find
598 the other ``BBFILE_*`` variables. Typically, each layer will append
599 its name to this variable in its ``conf/layer.conf`` file.
600
Andrew Geisslerf0343792020-11-18 10:42:21 -0600601 :term:`BBFILE_PATTERN`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500602 Variable that expands to match files from
603 :term:`BBFILES` in a particular layer. This variable
604 is used in the ``conf/layer.conf`` file and must be suffixed with the
605 name of the specific layer (e.g. ``BBFILE_PATTERN_emenlow``).
606
Andrew Geisslerf0343792020-11-18 10:42:21 -0600607 :term:`BBFILE_PRIORITY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500608 Assigns the priority for recipe files in each layer.
609
610 This variable is useful in situations where the same recipe appears
611 in more than one layer. Setting this variable allows you to
612 prioritize a layer against other layers that contain the same recipe
613 - effectively letting you control the precedence for the multiple
614 layers. The precedence established through this variable stands
615 regardless of a recipe's version (:term:`PV` variable). For
616 example, a layer that has a recipe with a higher ``PV`` value but for
617 which the ``BBFILE_PRIORITY`` is set to have a lower precedence still
618 has a lower precedence.
619
620 A larger value for the ``BBFILE_PRIORITY`` variable results in a
621 higher precedence. For example, the value 6 has a higher precedence
622 than the value 5. If not specified, the ``BBFILE_PRIORITY`` variable
623 is set based on layer dependencies (see the ``LAYERDEPENDS`` variable
624 for more information. The default priority, if unspecified for a
625 layer with no dependencies, is the lowest defined priority + 1 (or 1
626 if no priorities are defined).
627
628 .. tip::
629
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500630 You can use the command ``bitbake-layers show-layers``
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500631 to list all configured layers along with their priorities.
632
Andrew Geisslerf0343792020-11-18 10:42:21 -0600633 :term:`BBFILES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500634 A space-separated list of recipe files BitBake uses to build
635 software.
636
637 When specifying recipe files, you can pattern match using Python's
638 `glob <https://docs.python.org/3/library/glob.html>`_ syntax.
639 For details on the syntax, see the documentation by following the
640 previous link.
641
Andrew Geisslerf0343792020-11-18 10:42:21 -0600642 :term:`BBFILES_DYNAMIC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500643 Activates content when identified layers are present. You identify
644 the layers by the collections that the layers define.
645
646 Use the ``BBFILES_DYNAMIC`` variable to avoid ``.bbappend`` files
647 whose corresponding ``.bb`` file is in a layer that attempts to
648 modify other layers through ``.bbappend`` but does not want to
649 introduce a hard dependency on those other layers.
650
651 Use the following form for ``BBFILES_DYNAMIC``:
652 collection_name:filename_pattern The following example identifies two
653 collection names and two filename patterns:
654 ::
655
656 BBFILES_DYNAMIC += " \
657 clang-layer:${LAYERDIR}/bbappends/meta-clang/*/*/*.bbappend \
658 core:${LAYERDIR}/bbappends/openembedded-core/meta/*/*/*.bbappend \
659 "
660
661 This next example shows an error message that occurs because invalid
662 entries are found, which cause parsing to abort:
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500663
664 .. code-block:: none
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500665
666 ERROR: BBFILES_DYNAMIC entries must be of the form <collection name>:<filename pattern>, not:
667 /work/my-layer/bbappends/meta-security-isafw/*/*/*.bbappend
668 /work/my-layer/bbappends/openembedded-core/meta/*/*/*.bbappend
669
Andrew Geisslerf0343792020-11-18 10:42:21 -0600670 :term:`BBINCLUDELOGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500671 Variable that controls how BitBake displays logs on build failure.
672
Andrew Geisslerf0343792020-11-18 10:42:21 -0600673 :term:`BBINCLUDELOGS_LINES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500674 If :term:`BBINCLUDELOGS` is set, specifies the
675 maximum number of lines from the task log file to print when
676 reporting a failed task. If you do not set ``BBINCLUDELOGS_LINES``,
677 the entire log is printed.
678
Andrew Geisslerf0343792020-11-18 10:42:21 -0600679 :term:`BBLAYERS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500680 Lists the layers to enable during the build. This variable is defined
681 in the ``bblayers.conf`` configuration file in the :term:`Build Directory`.
682 Here is an example:
683 ::
684
685 BBLAYERS = " \
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500686 /home/scottrif/poky/meta \
687 /home/scottrif/poky/meta-poky \
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500688 /home/scottrif/poky/meta-yocto-bsp \
689 /home/scottrif/poky/meta-mykernel \
690 "
691
692 This example enables four layers, one of which is a custom,
693 user-defined layer named ``meta-mykernel``.
694
Andrew Geisslerf0343792020-11-18 10:42:21 -0600695 :term:`BBMASK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500696 Prevents BitBake from processing recipes and recipe append files.
697
698 You can use the ``BBMASK`` variable to "hide" these ``.bb`` and
699 ``.bbappend`` files. BitBake ignores any recipe or recipe append
700 files that match any of the expressions. It is as if BitBake does not
701 see them at all. Consequently, matching files are not parsed or
702 otherwise used by BitBake.
703
704 The values you provide are passed to Python's regular expression
705 compiler. Consequently, the syntax follows Python's Regular
706 Expression (re) syntax. The expressions are compared against the full
707 paths to the files. For complete syntax information, see Python's
Andrew Geisslerc3d88e42020-10-02 09:45:00 -0500708 documentation at https://docs.python.org/3/library/re.html#regular-expression-syntax.
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500709
710 The following example uses a complete regular expression to tell
711 BitBake to ignore all recipe and recipe append files in the
712 ``meta-ti/recipes-misc/`` directory:
713 ::
714
715 BBMASK = "meta-ti/recipes-misc/"
716
717 If you want to mask out multiple directories or recipes, you can
718 specify multiple regular expression fragments. This next example
719 masks out multiple directories and individual recipes: ::
720
721 BBMASK += "/meta-ti/recipes-misc/ meta-ti/recipes-ti/packagegroup/"
722 BBMASK += "/meta-oe/recipes-support/"
723 BBMASK += "/meta-foo/.*/openldap"
724 BBMASK += "opencv.*\.bbappend"
725 BBMASK += "lzma"
726
727 .. note::
728
729 When specifying a directory name, use the trailing slash character
730 to ensure you match just that directory name.
731
Andrew Geisslerf0343792020-11-18 10:42:21 -0600732 :term:`BBMULTICONFIG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500733 Specifies each additional separate configuration when you are
734 building targets with multiple configurations. Use this variable in
735 your ``conf/local.conf`` configuration file. Specify a
736 multiconfigname for each configuration file you are using. For
737 example, the following line specifies three configuration files:
738 ::
739
740 BBMULTICONFIG = "configA configB configC"
741
742 Each configuration file you
743 use must reside in the :term:`Build Directory`
744 ``conf/multiconfig`` directory (e.g.
745 build_directory\ ``/conf/multiconfig/configA.conf``).
746
747 For information on how to use ``BBMULTICONFIG`` in an environment
748 that supports building targets with multiple configurations, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -0600749 ":ref:`dev-manual/common-tasks:building images for multiple targets using multiple configurations`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500750 section in the Yocto Project Development Tasks Manual.
751
Andrew Geisslerf0343792020-11-18 10:42:21 -0600752 :term:`BBPATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500753 Used by BitBake to locate ``.bbclass`` and configuration files. This
754 variable is analogous to the ``PATH`` variable.
755
756 .. note::
757
758 If you run BitBake from a directory outside of the
759 Build Directory
760 , you must be sure to set
761 BBPATH
762 to point to the Build Directory. Set the variable as you would any
763 environment variable and then run BitBake:
764 ::
765
766 $ BBPATH = "build_directory"
767 $ export BBPATH
768 $ bitbake target
769
770
Andrew Geisslerf0343792020-11-18 10:42:21 -0600771 :term:`BBSERVER`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500772 If defined in the BitBake environment, ``BBSERVER`` points to the
773 BitBake remote server.
774
775 Use the following format to export the variable to the BitBake
776 environment:
777 ::
778
779 export BBSERVER=localhost:$port
780
781 By default, ``BBSERVER`` also appears in
782 :term:`bitbake:BB_HASHBASE_WHITELIST`.
783 Consequently, ``BBSERVER`` is excluded from checksum and dependency
784 data.
785
Andrew Geisslerf0343792020-11-18 10:42:21 -0600786 :term:`BINCONFIG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500787 When inheriting the
788 :ref:`binconfig-disabled <ref-classes-binconfig-disabled>` class,
789 this variable specifies binary configuration scripts to disable in
790 favor of using ``pkg-config`` to query the information. The
791 ``binconfig-disabled`` class will modify the specified scripts to
792 return an error so that calls to them can be easily found and
793 replaced.
794
795 To add multiple scripts, separate them by spaces. Here is an example
796 from the ``libpng`` recipe:
797 ::
798
799 BINCONFIG = "${bindir}/libpng-config ${bindir}/libpng16-config"
800
Andrew Geisslerf0343792020-11-18 10:42:21 -0600801 :term:`BINCONFIG_GLOB`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500802 When inheriting the :ref:`binconfig <ref-classes-binconfig>` class,
803 this variable specifies a wildcard for configuration scripts that
804 need editing. The scripts are edited to correct any paths that have
805 been set up during compilation so that they are correct for use when
806 installed into the sysroot and called by the build processes of other
807 recipes.
808
809 .. note::
810
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500811 The ``BINCONFIG_GLOB`` variable uses
812 `shell globbing <https://tldp.org/LDP/abs/html/globbingref.html>`__,
813 which is recognition and expansion of wildcards during pattern
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500814 matching. Shell globbing is very similar to
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500815 `fnmatch <https://docs.python.org/3/library/fnmatch.html#module-fnmatch>`__
816 and `glob <https://docs.python.org/3/library/glob.html>`__.
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500817
818 For more information on how this variable works, see
819 ``meta/classes/binconfig.bbclass`` in the :term:`Source Directory`.
820 You can also find general
821 information on the class in the
822 ":ref:`binconfig.bbclass <ref-classes-binconfig>`" section.
823
Andrew Geisslerf0343792020-11-18 10:42:21 -0600824 :term:`BP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500825 The base recipe name and version but without any special recipe name
826 suffix (i.e. ``-native``, ``lib64-``, and so forth). ``BP`` is
827 comprised of the following:
828 ::
829
830 ${BPN}-${PV}
831
Andrew Geisslerf0343792020-11-18 10:42:21 -0600832 :term:`BPN`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500833 This variable is a version of the :term:`PN` variable with
834 common prefixes and suffixes removed, such as ``nativesdk-``,
835 ``-cross``, ``-native``, and multilib's ``lib64-`` and ``lib32-``.
836 The exact lists of prefixes and suffixes removed are specified by the
837 :term:`MLPREFIX` and
838 :term:`SPECIAL_PKGSUFFIX` variables,
839 respectively.
840
Andrew Geisslerf0343792020-11-18 10:42:21 -0600841 :term:`BUGTRACKER`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500842 Specifies a URL for an upstream bug tracking website for a recipe.
843 The OpenEmbedded build system does not use this variable. Rather, the
844 variable is a useful pointer in case a bug in the software being
845 built needs to be manually reported.
846
Andrew Geisslerf0343792020-11-18 10:42:21 -0600847 :term:`BUILD_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500848 Specifies the architecture of the build host (e.g. ``i686``). The
849 OpenEmbedded build system sets the value of ``BUILD_ARCH`` from the
850 machine name reported by the ``uname`` command.
851
Andrew Geisslerf0343792020-11-18 10:42:21 -0600852 :term:`BUILD_AS_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500853 Specifies the architecture-specific assembler flags for the build
854 host. By default, the value of ``BUILD_AS_ARCH`` is empty.
855
Andrew Geisslerf0343792020-11-18 10:42:21 -0600856 :term:`BUILD_CC_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500857 Specifies the architecture-specific C compiler flags for the build
858 host. By default, the value of ``BUILD_CC_ARCH`` is empty.
859
Andrew Geisslerf0343792020-11-18 10:42:21 -0600860 :term:`BUILD_CCLD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500861 Specifies the linker command to be used for the build host when the C
862 compiler is being used as the linker. By default, ``BUILD_CCLD``
863 points to GCC and passes as arguments the value of
864 :term:`BUILD_CC_ARCH`, assuming
865 ``BUILD_CC_ARCH`` is set.
866
Andrew Geisslerf0343792020-11-18 10:42:21 -0600867 :term:`BUILD_CFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500868 Specifies the flags to pass to the C compiler when building for the
869 build host. When building in the ``-native`` context,
870 :term:`CFLAGS` is set to the value of this variable by
871 default.
872
Andrew Geisslerf0343792020-11-18 10:42:21 -0600873 :term:`BUILD_CPPFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500874 Specifies the flags to pass to the C preprocessor (i.e. to both the C
875 and the C++ compilers) when building for the build host. When
876 building in the ``-native`` context, :term:`CPPFLAGS`
877 is set to the value of this variable by default.
878
Andrew Geisslerf0343792020-11-18 10:42:21 -0600879 :term:`BUILD_CXXFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500880 Specifies the flags to pass to the C++ compiler when building for the
881 build host. When building in the ``-native`` context,
882 :term:`CXXFLAGS` is set to the value of this variable
883 by default.
884
Andrew Geisslerf0343792020-11-18 10:42:21 -0600885 :term:`BUILD_FC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500886 Specifies the Fortran compiler command for the build host. By
887 default, ``BUILD_FC`` points to Gfortran and passes as arguments the
888 value of :term:`BUILD_CC_ARCH`, assuming
889 ``BUILD_CC_ARCH`` is set.
890
Andrew Geisslerf0343792020-11-18 10:42:21 -0600891 :term:`BUILD_LD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500892 Specifies the linker command for the build host. By default,
893 ``BUILD_LD`` points to the GNU linker (ld) and passes as arguments
894 the value of :term:`BUILD_LD_ARCH`, assuming
895 ``BUILD_LD_ARCH`` is set.
896
Andrew Geisslerf0343792020-11-18 10:42:21 -0600897 :term:`BUILD_LD_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500898 Specifies architecture-specific linker flags for the build host. By
899 default, the value of ``BUILD_LD_ARCH`` is empty.
900
Andrew Geisslerf0343792020-11-18 10:42:21 -0600901 :term:`BUILD_LDFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500902 Specifies the flags to pass to the linker when building for the build
903 host. When building in the ``-native`` context,
904 :term:`LDFLAGS` is set to the value of this variable
905 by default.
906
Andrew Geisslerf0343792020-11-18 10:42:21 -0600907 :term:`BUILD_OPTIMIZATION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500908 Specifies the optimization flags passed to the C compiler when
909 building for the build host or the SDK. The flags are passed through
910 the :term:`BUILD_CFLAGS` and
911 :term:`BUILDSDK_CFLAGS` default values.
912
913 The default value of the ``BUILD_OPTIMIZATION`` variable is "-O2
914 -pipe".
915
Andrew Geisslerf0343792020-11-18 10:42:21 -0600916 :term:`BUILD_OS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500917 Specifies the operating system in use on the build host (e.g.
918 "linux"). The OpenEmbedded build system sets the value of
919 ``BUILD_OS`` from the OS reported by the ``uname`` command - the
920 first word, converted to lower-case characters.
921
Andrew Geisslerf0343792020-11-18 10:42:21 -0600922 :term:`BUILD_PREFIX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500923 The toolchain binary prefix used for native recipes. The OpenEmbedded
924 build system uses the ``BUILD_PREFIX`` value to set the
925 :term:`TARGET_PREFIX` when building for
926 ``native`` recipes.
927
Andrew Geisslerf0343792020-11-18 10:42:21 -0600928 :term:`BUILD_STRIP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500929 Specifies the command to be used to strip debugging symbols from
930 binaries produced for the build host. By default, ``BUILD_STRIP``
931 points to
932 ``${``\ :term:`BUILD_PREFIX`\ ``}strip``.
933
Andrew Geisslerf0343792020-11-18 10:42:21 -0600934 :term:`BUILD_SYS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500935 Specifies the system, including the architecture and the operating
936 system, to use when building for the build host (i.e. when building
937 ``native`` recipes).
938
939 The OpenEmbedded build system automatically sets this variable based
940 on :term:`BUILD_ARCH`,
941 :term:`BUILD_VENDOR`, and
942 :term:`BUILD_OS`. You do not need to set the
943 ``BUILD_SYS`` variable yourself.
944
Andrew Geisslerf0343792020-11-18 10:42:21 -0600945 :term:`BUILD_VENDOR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500946 Specifies the vendor name to use when building for the build host.
947 The default value is an empty string ("").
948
Andrew Geisslerf0343792020-11-18 10:42:21 -0600949 :term:`BUILDDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500950 Points to the location of the :term:`Build Directory`.
951 You can define this directory indirectly through the
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500952 :ref:`structure-core-script` script by passing in a Build
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500953 Directory path when you run the script. If you run the script and do
954 not provide a Build Directory path, the ``BUILDDIR`` defaults to
955 ``build`` in the current directory.
956
Andrew Geisslerf0343792020-11-18 10:42:21 -0600957 :term:`BUILDHISTORY_COMMIT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500958 When inheriting the :ref:`buildhistory <ref-classes-buildhistory>`
959 class, this variable specifies whether or not to commit the build
960 history output in a local Git repository. If set to "1", this local
961 repository will be maintained automatically by the ``buildhistory``
962 class and a commit will be created on every build for changes to each
963 top-level subdirectory of the build history output (images, packages,
964 and sdk). If you want to track changes to build history over time,
965 you should set this value to "1".
966
967 By default, the ``buildhistory`` class does not commit the build
968 history output in a local Git repository:
969 ::
970
971 BUILDHISTORY_COMMIT ?= "0"
972
Andrew Geisslerf0343792020-11-18 10:42:21 -0600973 :term:`BUILDHISTORY_COMMIT_AUTHOR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500974 When inheriting the :ref:`buildhistory <ref-classes-buildhistory>`
975 class, this variable specifies the author to use for each Git commit.
976 In order for the ``BUILDHISTORY_COMMIT_AUTHOR`` variable to work, the
977 :term:`BUILDHISTORY_COMMIT` variable must
978 be set to "1".
979
980 Git requires that the value you provide for the
981 ``BUILDHISTORY_COMMIT_AUTHOR`` variable takes the form of "name
982 email@host". Providing an email address or host that is not valid
983 does not produce an error.
984
985 By default, the ``buildhistory`` class sets the variable as follows:
986 ::
987
988 BUILDHISTORY_COMMIT_AUTHOR ?= "buildhistory <buildhistory@${DISTRO}>"
989
Andrew Geisslerf0343792020-11-18 10:42:21 -0600990 :term:`BUILDHISTORY_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500991 When inheriting the :ref:`buildhistory <ref-classes-buildhistory>`
992 class, this variable specifies the directory in which build history
993 information is kept. For more information on how the variable works,
994 see the ``buildhistory.class``.
995
996 By default, the ``buildhistory`` class sets the directory as follows:
997 ::
998
999 BUILDHISTORY_DIR ?= "${TOPDIR}/buildhistory"
1000
Andrew Geisslerf0343792020-11-18 10:42:21 -06001001 :term:`BUILDHISTORY_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001002 When inheriting the :ref:`buildhistory <ref-classes-buildhistory>`
1003 class, this variable specifies the build history features to be
1004 enabled. For more information on how build history works, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06001005 ":ref:`dev-manual/common-tasks:maintaining build output quality`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001006 section in the Yocto Project Development Tasks Manual.
1007
1008 You can specify these features in the form of a space-separated list:
1009
1010 - *image:* Analysis of the contents of images, which includes the
1011 list of installed packages among other things.
1012
1013 - *package:* Analysis of the contents of individual packages.
1014
1015 - *sdk:* Analysis of the contents of the software development kit
1016 (SDK).
1017
1018 - *task:* Save output file signatures for
Andrew Geissler09209ee2020-12-13 08:44:15 -06001019 :ref:`shared state <overview-manual/concepts:shared state cache>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001020 (sstate) tasks.
1021 This saves one file per task and lists the SHA-256 checksums for
1022 each file staged (i.e. the output of the task).
1023
1024 By default, the ``buildhistory`` class enables the following
1025 features:
1026 ::
1027
1028 BUILDHISTORY_FEATURES ?= "image package sdk"
1029
Andrew Geisslerf0343792020-11-18 10:42:21 -06001030 :term:`BUILDHISTORY_IMAGE_FILES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001031 When inheriting the :ref:`buildhistory <ref-classes-buildhistory>`
1032 class, this variable specifies a list of paths to files copied from
1033 the image contents into the build history directory under an
1034 "image-files" directory in the directory for the image, so that you
1035 can track the contents of each file. The default is to copy
1036 ``/etc/passwd`` and ``/etc/group``, which allows you to monitor for
1037 changes in user and group entries. You can modify the list to include
1038 any file. Specifying an invalid path does not produce an error.
1039 Consequently, you can include files that might not always be present.
1040
1041 By default, the ``buildhistory`` class provides paths to the
1042 following files:
1043 ::
1044
1045 BUILDHISTORY_IMAGE_FILES ?= "/etc/passwd /etc/group"
1046
Andrew Geisslerf0343792020-11-18 10:42:21 -06001047 :term:`BUILDHISTORY_PUSH_REPO`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001048 When inheriting the :ref:`buildhistory <ref-classes-buildhistory>`
1049 class, this variable optionally specifies a remote repository to
1050 which build history pushes Git changes. In order for
1051 ``BUILDHISTORY_PUSH_REPO`` to work,
1052 :term:`BUILDHISTORY_COMMIT` must be set to
1053 "1".
1054
1055 The repository should correspond to a remote address that specifies a
1056 repository as understood by Git, or alternatively to a remote name
1057 that you have set up manually using ``git remote`` within the local
1058 repository.
1059
1060 By default, the ``buildhistory`` class sets the variable as follows:
1061 ::
1062
1063 BUILDHISTORY_PUSH_REPO ?= ""
1064
Andrew Geisslerf0343792020-11-18 10:42:21 -06001065 :term:`BUILDSDK_CFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001066 Specifies the flags to pass to the C compiler when building for the
1067 SDK. When building in the ``nativesdk-`` context,
1068 :term:`CFLAGS` is set to the value of this variable by
1069 default.
1070
Andrew Geisslerf0343792020-11-18 10:42:21 -06001071 :term:`BUILDSDK_CPPFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001072 Specifies the flags to pass to the C pre-processor (i.e. to both the
1073 C and the C++ compilers) when building for the SDK. When building in
1074 the ``nativesdk-`` context, :term:`CPPFLAGS` is set
1075 to the value of this variable by default.
1076
Andrew Geisslerf0343792020-11-18 10:42:21 -06001077 :term:`BUILDSDK_CXXFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001078 Specifies the flags to pass to the C++ compiler when building for the
1079 SDK. When building in the ``nativesdk-`` context,
1080 :term:`CXXFLAGS` is set to the value of this variable
1081 by default.
1082
Andrew Geisslerf0343792020-11-18 10:42:21 -06001083 :term:`BUILDSDK_LDFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001084 Specifies the flags to pass to the linker when building for the SDK.
1085 When building in the ``nativesdk-`` context,
1086 :term:`LDFLAGS` is set to the value of this variable
1087 by default.
1088
Andrew Geisslerf0343792020-11-18 10:42:21 -06001089 :term:`BUILDSTATS_BASE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001090 Points to the location of the directory that holds build statistics
1091 when you use and enable the
1092 :ref:`buildstats <ref-classes-buildstats>` class. The
1093 ``BUILDSTATS_BASE`` directory defaults to
1094 ``${``\ :term:`TMPDIR`\ ``}/buildstats/``.
1095
Andrew Geisslerf0343792020-11-18 10:42:21 -06001096 :term:`BUSYBOX_SPLIT_SUID`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001097 For the BusyBox recipe, specifies whether to split the output
1098 executable file into two parts: one for features that require
1099 ``setuid root``, and one for the remaining features (i.e. those that
1100 do not require ``setuid root``).
1101
1102 The ``BUSYBOX_SPLIT_SUID`` variable defaults to "1", which results in
1103 splitting the output executable file. Set the variable to "0" to get
1104 a single output executable file.
1105
Andrew Geisslerf0343792020-11-18 10:42:21 -06001106 :term:`CACHE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001107 Specifies the directory BitBake uses to store a cache of the
1108 :term:`Metadata` so it does not need to be parsed every time
1109 BitBake is started.
1110
Andrew Geisslerf0343792020-11-18 10:42:21 -06001111 :term:`CC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001112 The minimal command and arguments used to run the C compiler.
1113
Andrew Geisslerf0343792020-11-18 10:42:21 -06001114 :term:`CFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001115 Specifies the flags to pass to the C compiler. This variable is
1116 exported to an environment variable and thus made visible to the
1117 software being built during the compilation step.
1118
1119 Default initialization for ``CFLAGS`` varies depending on what is
1120 being built:
1121
1122 - :term:`TARGET_CFLAGS` when building for the
1123 target
1124
1125 - :term:`BUILD_CFLAGS` when building for the
1126 build host (i.e. ``-native``)
1127
1128 - :term:`BUILDSDK_CFLAGS` when building for
1129 an SDK (i.e. ``nativesdk-``)
1130
Andrew Geisslerf0343792020-11-18 10:42:21 -06001131 :term:`CLASSOVERRIDE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001132 An internal variable specifying the special class override that
1133 should currently apply (e.g. "class-target", "class-native", and so
1134 forth). The classes that use this variable (e.g.
1135 :ref:`native <ref-classes-native>`,
1136 :ref:`nativesdk <ref-classes-nativesdk>`, and so forth) set the
1137 variable to appropriate values.
1138
1139 .. note::
1140
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001141 ``CLASSOVERRIDE`` gets its default "class-target" value from the
1142 ``bitbake.conf`` file.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001143
1144 As an example, the following override allows you to install extra
1145 files, but only when building for the target:
1146 ::
1147
1148 do_install_append_class-target() {
1149 install my-extra-file ${D}${sysconfdir}
1150 }
1151
1152 Here is an example where ``FOO`` is set to
1153 "native" when building for the build host, and to "other" when not
1154 building for the build host:
1155 ::
1156
1157 FOO_class-native = "native"
1158 FOO = "other"
1159
1160 The underlying mechanism behind ``CLASSOVERRIDE`` is simply
1161 that it is included in the default value of
1162 :term:`OVERRIDES`.
1163
Andrew Geisslerf0343792020-11-18 10:42:21 -06001164 :term:`CLEANBROKEN`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001165 If set to "1" within a recipe, ``CLEANBROKEN`` specifies that the
1166 ``make clean`` command does not work for the software being built.
1167 Consequently, the OpenEmbedded build system will not try to run
1168 ``make clean`` during the :ref:`ref-tasks-configure`
1169 task, which is the default behavior.
1170
Andrew Geisslerf0343792020-11-18 10:42:21 -06001171 :term:`COMBINED_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001172 Provides a list of hardware features that are enabled in both
1173 :term:`MACHINE_FEATURES` and
1174 :term:`DISTRO_FEATURES`. This select list of
1175 features contains features that make sense to be controlled both at
1176 the machine and distribution configuration level. For example, the
1177 "bluetooth" feature requires hardware support but should also be
1178 optional at the distribution level, in case the hardware supports
1179 Bluetooth but you do not ever intend to use it.
1180
Andrew Geisslerf0343792020-11-18 10:42:21 -06001181 :term:`COMMON_LICENSE_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001182 Points to ``meta/files/common-licenses`` in the
1183 :term:`Source Directory`, which is where generic license
1184 files reside.
1185
Andrew Geisslerf0343792020-11-18 10:42:21 -06001186 :term:`COMPATIBLE_HOST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001187 A regular expression that resolves to one or more hosts (when the
1188 recipe is native) or one or more targets (when the recipe is
1189 non-native) with which a recipe is compatible. The regular expression
1190 is matched against :term:`HOST_SYS`. You can use the
1191 variable to stop recipes from being built for classes of systems with
1192 which the recipes are not compatible. Stopping these builds is
1193 particularly useful with kernels. The variable also helps to increase
1194 parsing speed since the build system skips parsing recipes not
1195 compatible with the current system.
1196
Andrew Geisslerf0343792020-11-18 10:42:21 -06001197 :term:`COMPATIBLE_MACHINE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001198 A regular expression that resolves to one or more target machines
1199 with which a recipe is compatible. The regular expression is matched
1200 against :term:`MACHINEOVERRIDES`. You can use
1201 the variable to stop recipes from being built for machines with which
1202 the recipes are not compatible. Stopping these builds is particularly
1203 useful with kernels. The variable also helps to increase parsing
1204 speed since the build system skips parsing recipes not compatible
1205 with the current machine.
1206
Andrew Geisslerf0343792020-11-18 10:42:21 -06001207 :term:`COMPLEMENTARY_GLOB`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001208 Defines wildcards to match when installing a list of complementary
1209 packages for all the packages explicitly (or implicitly) installed in
1210 an image.
1211
1212 .. note::
1213
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001214 The ``COMPLEMENTARY_GLOB`` variable uses Unix filename pattern matching
1215 (`fnmatch <https://docs.python.org/3/library/fnmatch.html#module-fnmatch>`__),
1216 which is similar to the Unix style pathname pattern expansion
1217 (`glob <https://docs.python.org/3/library/glob.html>`__).
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001218
1219 The resulting list of complementary packages is associated with an
1220 item that can be added to
1221 :term:`IMAGE_FEATURES`. An example usage of
1222 this is the "dev-pkgs" item that when added to ``IMAGE_FEATURES``
1223 will install -dev packages (containing headers and other development
1224 files) for every package in the image.
1225
1226 To add a new feature item pointing to a wildcard, use a variable flag
1227 to specify the feature item name and use the value to specify the
1228 wildcard. Here is an example:
1229 ::
1230
1231 COMPLEMENTARY_GLOB[dev-pkgs] = '*-dev'
1232
Andrew Geisslerf0343792020-11-18 10:42:21 -06001233 :term:`COMPONENTS_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001234 Stores sysroot components for each recipe. The OpenEmbedded build
1235 system uses ``COMPONENTS_DIR`` when constructing recipe-specific
1236 sysroots for other recipes.
1237
1238 The default is
1239 "``${``\ :term:`STAGING_DIR`\ ``}-components``."
1240 (i.e.
1241 "``${``\ :term:`TMPDIR`\ ``}/sysroots-components``").
1242
Andrew Geisslerf0343792020-11-18 10:42:21 -06001243 :term:`CONF_VERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001244 Tracks the version of the local configuration file (i.e.
1245 ``local.conf``). The value for ``CONF_VERSION`` increments each time
1246 ``build/conf/`` compatibility changes.
1247
Andrew Geisslerf0343792020-11-18 10:42:21 -06001248 :term:`CONFFILES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001249 Identifies editable or configurable files that are part of a package.
1250 If the Package Management System (PMS) is being used to update
1251 packages on the target system, it is possible that configuration
1252 files you have changed after the original installation and that you
1253 now want to remain unchanged are overwritten. In other words,
1254 editable files might exist in the package that you do not want reset
1255 as part of the package update process. You can use the ``CONFFILES``
1256 variable to list the files in the package that you wish to prevent
1257 the PMS from overwriting during this update process.
1258
1259 To use the ``CONFFILES`` variable, provide a package name override
1260 that identifies the resulting package. Then, provide a
1261 space-separated list of files. Here is an example:
1262 ::
1263
1264 CONFFILES_${PN} += "${sysconfdir}/file1 \
1265 ${sysconfdir}/file2 ${sysconfdir}/file3"
1266
1267 A relationship exists between the ``CONFFILES`` and ``FILES``
1268 variables. The files listed within ``CONFFILES`` must be a subset of
1269 the files listed within ``FILES``. Because the configuration files
1270 you provide with ``CONFFILES`` are simply being identified so that
1271 the PMS will not overwrite them, it makes sense that the files must
1272 already be included as part of the package through the ``FILES``
1273 variable.
1274
1275 .. note::
1276
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001277 When specifying paths as part of the ``CONFFILES`` variable, it is
1278 good practice to use appropriate path variables.
1279 For example, ``${sysconfdir}`` rather than ``/etc`` or ``${bindir}``
1280 rather than ``/usr/bin``. You can find a list of these variables at
1281 the top of the ``meta/conf/bitbake.conf`` file in the
1282 :term:`Source Directory`.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001283
Andrew Geisslerf0343792020-11-18 10:42:21 -06001284 :term:`CONFIG_INITRAMFS_SOURCE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001285 Identifies the initial RAM filesystem (initramfs) source files. The
1286 OpenEmbedded build system receives and uses this kernel Kconfig
1287 variable as an environment variable. By default, the variable is set
1288 to null ("").
1289
1290 The ``CONFIG_INITRAMFS_SOURCE`` can be either a single cpio archive
1291 with a ``.cpio`` suffix or a space-separated list of directories and
1292 files for building the initramfs image. A cpio archive should contain
1293 a filesystem archive to be used as an initramfs image. Directories
1294 should contain a filesystem layout to be included in the initramfs
1295 image. Files should contain entries according to the format described
1296 by the ``usr/gen_init_cpio`` program in the kernel tree.
1297
1298 If you specify multiple directories and files, the initramfs image
1299 will be the aggregate of all of them.
1300
1301 For information on creating an initramfs, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06001302 ":ref:`dev-manual/common-tasks:building an initial ram filesystem (initramfs) image`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001303 in the Yocto Project Development Tasks Manual.
1304
Andrew Geisslerf0343792020-11-18 10:42:21 -06001305 :term:`CONFIG_SITE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001306 A list of files that contains ``autoconf`` test results relevant to
1307 the current build. This variable is used by the Autotools utilities
1308 when running ``configure``.
1309
Andrew Geisslerf0343792020-11-18 10:42:21 -06001310 :term:`CONFIGURE_FLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001311 The minimal arguments for GNU configure.
1312
Andrew Geisslerf0343792020-11-18 10:42:21 -06001313 :term:`CONFLICT_DISTRO_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001314 When inheriting the
Andrew Geissler6ce62a22020-11-30 19:58:47 -06001315 :ref:`features_check <ref-classes-features_check>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001316 class, this variable identifies distribution features that would be
1317 in conflict should the recipe be built. In other words, if the
1318 ``CONFLICT_DISTRO_FEATURES`` variable lists a feature that also
Andrew Geissler6ce62a22020-11-30 19:58:47 -06001319 appears in ``DISTRO_FEATURES`` within the current configuration, then
1320 the recipe will be skipped, and if the build system attempts to build
1321 the recipe then an error will be triggered.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001322
Andrew Geisslerf0343792020-11-18 10:42:21 -06001323 :term:`COPYLEFT_LICENSE_EXCLUDE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001324 A space-separated list of licenses to exclude from the source
1325 archived by the :ref:`archiver <ref-classes-archiver>` class. In
1326 other words, if a license in a recipe's
1327 :term:`LICENSE` value is in the value of
1328 ``COPYLEFT_LICENSE_EXCLUDE``, then its source is not archived by the
1329 class.
1330
1331 .. note::
1332
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001333 The ``COPYLEFT_LICENSE_EXCLUDE`` variable takes precedence over the
1334 :term:`COPYLEFT_LICENSE_INCLUDE` variable.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001335
1336 The default value, which is "CLOSED Proprietary", for
1337 ``COPYLEFT_LICENSE_EXCLUDE`` is set by the
1338 :ref:`copyleft_filter <ref-classes-copyleft_filter>` class, which
1339 is inherited by the ``archiver`` class.
1340
Andrew Geisslerf0343792020-11-18 10:42:21 -06001341 :term:`COPYLEFT_LICENSE_INCLUDE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001342 A space-separated list of licenses to include in the source archived
1343 by the :ref:`archiver <ref-classes-archiver>` class. In other
1344 words, if a license in a recipe's :term:`LICENSE`
1345 value is in the value of ``COPYLEFT_LICENSE_INCLUDE``, then its
1346 source is archived by the class.
1347
1348 The default value is set by the
1349 :ref:`copyleft_filter <ref-classes-copyleft_filter>` class, which
1350 is inherited by the ``archiver`` class. The default value includes
1351 "GPL*", "LGPL*", and "AGPL*".
1352
Andrew Geisslerf0343792020-11-18 10:42:21 -06001353 :term:`COPYLEFT_PN_EXCLUDE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001354 A list of recipes to exclude in the source archived by the
1355 :ref:`archiver <ref-classes-archiver>` class. The
1356 ``COPYLEFT_PN_EXCLUDE`` variable overrides the license inclusion and
1357 exclusion caused through the
1358 :term:`COPYLEFT_LICENSE_INCLUDE` and
1359 :term:`COPYLEFT_LICENSE_EXCLUDE`
1360 variables, respectively.
1361
1362 The default value, which is "" indicating to not explicitly exclude
1363 any recipes by name, for ``COPYLEFT_PN_EXCLUDE`` is set by the
1364 :ref:`copyleft_filter <ref-classes-copyleft_filter>` class, which
1365 is inherited by the ``archiver`` class.
1366
Andrew Geisslerf0343792020-11-18 10:42:21 -06001367 :term:`COPYLEFT_PN_INCLUDE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001368 A list of recipes to include in the source archived by the
1369 :ref:`archiver <ref-classes-archiver>` class. The
1370 ``COPYLEFT_PN_INCLUDE`` variable overrides the license inclusion and
1371 exclusion caused through the
1372 :term:`COPYLEFT_LICENSE_INCLUDE` and
1373 :term:`COPYLEFT_LICENSE_EXCLUDE`
1374 variables, respectively.
1375
1376 The default value, which is "" indicating to not explicitly include
1377 any recipes by name, for ``COPYLEFT_PN_INCLUDE`` is set by the
1378 :ref:`copyleft_filter <ref-classes-copyleft_filter>` class, which
1379 is inherited by the ``archiver`` class.
1380
Andrew Geisslerf0343792020-11-18 10:42:21 -06001381 :term:`COPYLEFT_RECIPE_TYPES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001382 A space-separated list of recipe types to include in the source
1383 archived by the :ref:`archiver <ref-classes-archiver>` class.
1384 Recipe types are ``target``, ``native``, ``nativesdk``, ``cross``,
1385 ``crosssdk``, and ``cross-canadian``.
1386
1387 The default value, which is "target*", for ``COPYLEFT_RECIPE_TYPES``
1388 is set by the :ref:`copyleft_filter <ref-classes-copyleft_filter>`
1389 class, which is inherited by the ``archiver`` class.
1390
Andrew Geisslerf0343792020-11-18 10:42:21 -06001391 :term:`COPY_LIC_DIRS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001392 If set to "1" along with the
1393 :term:`COPY_LIC_MANIFEST` variable, the
1394 OpenEmbedded build system copies into the image the license files,
1395 which are located in ``/usr/share/common-licenses``, for each
1396 package. The license files are placed in directories within the image
1397 itself during build time.
1398
1399 .. note::
1400
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001401 The ``COPY_LIC_DIRS`` does not offer a path for adding licenses for
1402 newly installed packages to an image, which might be most suitable for
1403 read-only filesystems that cannot be upgraded. See the
1404 :term:`LICENSE_CREATE_PACKAGE` variable for additional information.
Andrew Geissler09209ee2020-12-13 08:44:15 -06001405 You can also reference the ":ref:`dev-manual/common-tasks:providing license text`"
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001406 section in the Yocto Project Development Tasks Manual for
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001407 information on providing license text.
1408
Andrew Geisslerf0343792020-11-18 10:42:21 -06001409 :term:`COPY_LIC_MANIFEST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001410 If set to "1", the OpenEmbedded build system copies the license
1411 manifest for the image to
1412 ``/usr/share/common-licenses/license.manifest`` within the image
1413 itself during build time.
1414
1415 .. note::
1416
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001417 The ``COPY_LIC_MANIFEST`` does not offer a path for adding licenses for
1418 newly installed packages to an image, which might be most suitable for
1419 read-only filesystems that cannot be upgraded. See the
1420 :term:`LICENSE_CREATE_PACKAGE` variable for additional information.
Andrew Geissler09209ee2020-12-13 08:44:15 -06001421 You can also reference the ":ref:`dev-manual/common-tasks:providing license text`"
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001422 section in the Yocto Project Development Tasks Manual for
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001423 information on providing license text.
1424
Andrew Geisslerf0343792020-11-18 10:42:21 -06001425 :term:`CORE_IMAGE_EXTRA_INSTALL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001426 Specifies the list of packages to be added to the image. You should
1427 only set this variable in the ``local.conf`` configuration file found
1428 in the :term:`Build Directory`.
1429
1430 This variable replaces ``POKY_EXTRA_INSTALL``, which is no longer
1431 supported.
1432
Andrew Geisslerf0343792020-11-18 10:42:21 -06001433 :term:`COREBASE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001434 Specifies the parent directory of the OpenEmbedded-Core Metadata
1435 layer (i.e. ``meta``).
1436
1437 It is an important distinction that ``COREBASE`` points to the parent
1438 of this layer and not the layer itself. Consider an example where you
1439 have cloned the Poky Git repository and retained the ``poky`` name
1440 for your local copy of the repository. In this case, ``COREBASE``
1441 points to the ``poky`` folder because it is the parent directory of
1442 the ``poky/meta`` layer.
1443
Andrew Geisslerf0343792020-11-18 10:42:21 -06001444 :term:`COREBASE_FILES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001445 Lists files from the :term:`COREBASE` directory that
1446 should be copied other than the layers listed in the
1447 ``bblayers.conf`` file. The ``COREBASE_FILES`` variable exists for
1448 the purpose of copying metadata from the OpenEmbedded build system
1449 into the extensible SDK.
1450
1451 Explicitly listing files in ``COREBASE`` is needed because it
1452 typically contains build directories and other files that should not
1453 normally be copied into the extensible SDK. Consequently, the value
1454 of ``COREBASE_FILES`` is used in order to only copy the files that
1455 are actually needed.
1456
Andrew Geisslerf0343792020-11-18 10:42:21 -06001457 :term:`CPP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001458 The minimal command and arguments used to run the C preprocessor.
1459
Andrew Geisslerf0343792020-11-18 10:42:21 -06001460 :term:`CPPFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001461 Specifies the flags to pass to the C pre-processor (i.e. to both the
1462 C and the C++ compilers). This variable is exported to an environment
1463 variable and thus made visible to the software being built during the
1464 compilation step.
1465
1466 Default initialization for ``CPPFLAGS`` varies depending on what is
1467 being built:
1468
1469 - :term:`TARGET_CPPFLAGS` when building for
1470 the target
1471
1472 - :term:`BUILD_CPPFLAGS` when building for the
1473 build host (i.e. ``-native``)
1474
1475 - :term:`BUILDSDK_CPPFLAGS` when building
1476 for an SDK (i.e. ``nativesdk-``)
1477
Andrew Geisslerf0343792020-11-18 10:42:21 -06001478 :term:`CROSS_COMPILE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001479 The toolchain binary prefix for the target tools. The
1480 ``CROSS_COMPILE`` variable is the same as the
1481 :term:`TARGET_PREFIX` variable.
1482
1483 .. note::
1484
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001485 The OpenEmbedded build system sets the ``CROSS_COMPILE``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001486 variable only in certain contexts (e.g. when building for kernel
1487 and kernel module recipes).
1488
Andrew Geisslerf0343792020-11-18 10:42:21 -06001489 :term:`CVSDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001490 The directory in which files checked out under the CVS system are
1491 stored.
1492
Andrew Geisslerf0343792020-11-18 10:42:21 -06001493 :term:`CXX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001494 The minimal command and arguments used to run the C++ compiler.
1495
Andrew Geisslerf0343792020-11-18 10:42:21 -06001496 :term:`CXXFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001497 Specifies the flags to pass to the C++ compiler. This variable is
1498 exported to an environment variable and thus made visible to the
1499 software being built during the compilation step.
1500
1501 Default initialization for ``CXXFLAGS`` varies depending on what is
1502 being built:
1503
1504 - :term:`TARGET_CXXFLAGS` when building for
1505 the target
1506
1507 - :term:`BUILD_CXXFLAGS` when building for the
1508 build host (i.e. ``-native``)
1509
1510 - :term:`BUILDSDK_CXXFLAGS` when building
1511 for an SDK (i.e. ``nativesdk-``)
1512
Andrew Geisslerf0343792020-11-18 10:42:21 -06001513 :term:`D`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001514 The destination directory. The location in the :term:`Build Directory`
1515 where components are installed by the
1516 :ref:`ref-tasks-install` task. This location defaults
1517 to:
1518 ::
1519
1520 ${WORKDIR}/image
1521
1522 .. note::
1523
1524 Tasks that read from or write to this directory should run under
Andrew Geissler09209ee2020-12-13 08:44:15 -06001525 :ref:`fakeroot <overview-manual/concepts:fakeroot and pseudo>`.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001526
Andrew Geisslerf0343792020-11-18 10:42:21 -06001527 :term:`DATE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001528 The date the build was started. Dates appear using the year, month,
1529 and day (YMD) format (e.g. "20150209" for February 9th, 2015).
1530
Andrew Geisslerf0343792020-11-18 10:42:21 -06001531 :term:`DATETIME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001532 The date and time on which the current build started. The format is
1533 suitable for timestamps.
1534
Andrew Geisslerf0343792020-11-18 10:42:21 -06001535 :term:`DEBIAN_NOAUTONAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001536 When the :ref:`debian <ref-classes-debian>` class is inherited,
1537 which is the default behavior, ``DEBIAN_NOAUTONAME`` specifies a
1538 particular package should not be renamed according to Debian library
1539 package naming. You must use the package name as an override when you
1540 set this variable. Here is an example from the ``fontconfig`` recipe:
1541 ::
1542
1543 DEBIAN_NOAUTONAME_fontconfig-utils = "1"
1544
Andrew Geisslerf0343792020-11-18 10:42:21 -06001545 :term:`DEBIANNAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001546 When the :ref:`debian <ref-classes-debian>` class is inherited,
1547 which is the default behavior, ``DEBIANNAME`` allows you to override
1548 the library name for an individual package. Overriding the library
1549 name in these cases is rare. You must use the package name as an
1550 override when you set this variable. Here is an example from the
1551 ``dbus`` recipe:
1552 ::
1553
1554 DEBIANNAME_${PN} = "dbus-1"
1555
Andrew Geisslerf0343792020-11-18 10:42:21 -06001556 :term:`DEBUG_BUILD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001557 Specifies to build packages with debugging information. This
1558 influences the value of the ``SELECTED_OPTIMIZATION`` variable.
1559
Andrew Geisslerf0343792020-11-18 10:42:21 -06001560 :term:`DEBUG_OPTIMIZATION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001561 The options to pass in ``TARGET_CFLAGS`` and ``CFLAGS`` when
1562 compiling a system for debugging. This variable defaults to "-O
1563 -fno-omit-frame-pointer ${DEBUG_FLAGS} -pipe".
1564
Andrew Geisslerf0343792020-11-18 10:42:21 -06001565 :term:`DEFAULT_PREFERENCE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001566 Specifies a weak bias for recipe selection priority.
1567
1568 The most common usage of this is variable is to set it to "-1" within
1569 a recipe for a development version of a piece of software. Using the
1570 variable in this way causes the stable version of the recipe to build
1571 by default in the absence of ``PREFERRED_VERSION`` being used to
1572 build the development version.
1573
1574 .. note::
1575
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001576 The bias provided by ``DEFAULT_PREFERENCE`` is weak and is overridden
1577 by :term:`BBFILE_PRIORITY` if that variable is different between two
1578 layers that contain different versions of the same recipe.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001579
Andrew Geisslerf0343792020-11-18 10:42:21 -06001580 :term:`DEFAULTTUNE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001581 The default CPU and Application Binary Interface (ABI) tunings (i.e.
1582 the "tune") used by the OpenEmbedded build system. The
1583 ``DEFAULTTUNE`` helps define
1584 :term:`TUNE_FEATURES`.
1585
1586 The default tune is either implicitly or explicitly set by the
1587 machine (:term:`MACHINE`). However, you can override
1588 the setting using available tunes as defined with
1589 :term:`AVAILTUNES`.
1590
Andrew Geisslerf0343792020-11-18 10:42:21 -06001591 :term:`DEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001592 Lists a recipe's build-time dependencies. These are dependencies on
1593 other recipes whose contents (e.g. headers and shared libraries) are
1594 needed by the recipe at build time.
1595
1596 As an example, consider a recipe ``foo`` that contains the following
1597 assignment:
1598 ::
1599
1600 DEPENDS = "bar"
1601
1602 The practical effect of the previous
1603 assignment is that all files installed by bar will be available in
1604 the appropriate staging sysroot, given by the
1605 :term:`STAGING_DIR* <STAGING_DIR>` variables, by the time the
1606 :ref:`ref-tasks-configure` task for ``foo`` runs.
1607 This mechanism is implemented by having ``do_configure`` depend on
1608 the :ref:`ref-tasks-populate_sysroot` task of
1609 each recipe listed in ``DEPENDS``, through a
1610 ``[``\ :ref:`deptask <bitbake:bitbake-user-manual/bitbake-user-manual-metadata:variable flags>`\ ``]``
1611 declaration in the :ref:`base <ref-classes-base>` class.
1612
1613 .. note::
1614
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001615 It seldom is necessary to reference, for example, ``STAGING_DIR_HOST``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001616 explicitly. The standard classes and build-related variables are
1617 configured to automatically use the appropriate staging sysroots.
1618
1619 As another example, ``DEPENDS`` can also be used to add utilities
1620 that run on the build machine during the build. For example, a recipe
1621 that makes use of a code generator built by the recipe ``codegen``
1622 might have the following:
1623 ::
1624
1625 DEPENDS = "codegen-native"
1626
1627 For more
1628 information, see the :ref:`native <ref-classes-native>` class and
1629 the :term:`EXTRANATIVEPATH` variable.
1630
1631 .. note::
1632
1633 - ``DEPENDS`` is a list of recipe names. Or, to be more precise,
1634 it is a list of :term:`PROVIDES` names, which
1635 usually match recipe names. Putting a package name such as
1636 "foo-dev" in ``DEPENDS`` does not make sense. Use "foo"
1637 instead, as this will put files from all the packages that make
1638 up ``foo``, which includes those from ``foo-dev``, into the
1639 sysroot.
1640
1641 - One recipe having another recipe in ``DEPENDS`` does not by
1642 itself add any runtime dependencies between the packages
1643 produced by the two recipes. However, as explained in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06001644 ":ref:`overview-manual/concepts:automatically added runtime dependencies`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001645 section in the Yocto Project Overview and Concepts Manual,
1646 runtime dependencies will often be added automatically, meaning
1647 ``DEPENDS`` alone is sufficient for most recipes.
1648
1649 - Counterintuitively, ``DEPENDS`` is often necessary even for
1650 recipes that install precompiled components. For example, if
1651 ``libfoo`` is a precompiled library that links against
1652 ``libbar``, then linking against ``libfoo`` requires both
1653 ``libfoo`` and ``libbar`` to be available in the sysroot.
1654 Without a ``DEPENDS`` from the recipe that installs ``libfoo``
1655 to the recipe that installs ``libbar``, other recipes might
1656 fail to link against ``libfoo``.
1657
1658 For information on runtime dependencies, see the
1659 :term:`RDEPENDS` variable. You can also see the
1660 ":ref:`Tasks <bitbake:bitbake-user-manual/bitbake-user-manual-metadata:tasks>`" and
1661 ":ref:`Dependencies <bitbake:bitbake-user-manual/bitbake-user-manual-execution:dependencies>`" sections in the
1662 BitBake User Manual for additional information on tasks and
1663 dependencies.
1664
Andrew Geisslerf0343792020-11-18 10:42:21 -06001665 :term:`DEPLOY_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001666 Points to the general area that the OpenEmbedded build system uses to
1667 place images, packages, SDKs, and other output files that are ready
1668 to be used outside of the build system. By default, this directory
1669 resides within the :term:`Build Directory` as
1670 ``${TMPDIR}/deploy``.
1671
1672 For more information on the structure of the Build Directory, see
Andrew Geissler09209ee2020-12-13 08:44:15 -06001673 ":ref:`ref-manual/structure:the build directory - \`\`build/\`\``" section.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001674 For more detail on the contents of the ``deploy`` directory, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06001675 ":ref:`overview-manual/concepts:images`",
1676 ":ref:`overview-manual/concepts:package feeds`", and
1677 ":ref:`overview-manual/concepts:application development sdk`" sections all in the
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001678 Yocto Project Overview and Concepts Manual.
1679
Andrew Geisslerf0343792020-11-18 10:42:21 -06001680 :term:`DEPLOY_DIR_DEB`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001681 Points to the area that the OpenEmbedded build system uses to place
1682 Debian packages that are ready to be used outside of the build
1683 system. This variable applies only when
1684 :term:`PACKAGE_CLASSES` contains
1685 "package_deb".
1686
1687 The BitBake configuration file initially defines the
1688 ``DEPLOY_DIR_DEB`` variable as a sub-folder of
1689 :term:`DEPLOY_DIR`:
1690 ::
1691
1692 DEPLOY_DIR_DEB = "${DEPLOY_DIR}/deb"
1693
1694 The :ref:`package_deb <ref-classes-package_deb>` class uses the
1695 ``DEPLOY_DIR_DEB`` variable to make sure the
1696 :ref:`ref-tasks-package_write_deb` task
1697 writes Debian packages into the appropriate folder. For more
Andrew Geissler09209ee2020-12-13 08:44:15 -06001698 information on how packaging works, see the
1699 ":ref:`overview-manual/concepts:package feeds`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001700 in the Yocto Project Overview and Concepts Manual.
1701
Andrew Geisslerf0343792020-11-18 10:42:21 -06001702 :term:`DEPLOY_DIR_IMAGE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001703 Points to the area that the OpenEmbedded build system uses to place
1704 images and other associated output files that are ready to be
1705 deployed onto the target machine. The directory is machine-specific
1706 as it contains the ``${MACHINE}`` name. By default, this directory
1707 resides within the :term:`Build Directory` as
1708 ``${DEPLOY_DIR}/images/${MACHINE}/``.
1709
1710 For more information on the structure of the Build Directory, see
Andrew Geissler09209ee2020-12-13 08:44:15 -06001711 ":ref:`ref-manual/structure:the build directory - \`\`build/\`\``" section.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001712 For more detail on the contents of the ``deploy`` directory, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06001713 ":ref:`overview-manual/concepts:images`" and
1714 ":ref:`overview-manual/concepts:application development sdk`" sections both in
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001715 the Yocto Project Overview and Concepts Manual.
1716
Andrew Geisslerf0343792020-11-18 10:42:21 -06001717 :term:`DEPLOY_DIR_IPK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001718 Points to the area that the OpenEmbedded build system uses to place
1719 IPK packages that are ready to be used outside of the build system.
1720 This variable applies only when
1721 :term:`PACKAGE_CLASSES` contains
1722 "package_ipk".
1723
1724 The BitBake configuration file initially defines this variable as a
1725 sub-folder of :term:`DEPLOY_DIR`:
1726 ::
1727
1728 DEPLOY_DIR_IPK = "${DEPLOY_DIR}/ipk"
1729
1730 The :ref:`package_ipk <ref-classes-package_ipk>` class uses the
1731 ``DEPLOY_DIR_IPK`` variable to make sure the
1732 :ref:`ref-tasks-package_write_ipk` task
1733 writes IPK packages into the appropriate folder. For more information
Andrew Geissler09209ee2020-12-13 08:44:15 -06001734 on how packaging works, see the
1735 ":ref:`overview-manual/concepts:package feeds`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001736 in the Yocto Project Overview and Concepts Manual.
1737
Andrew Geisslerf0343792020-11-18 10:42:21 -06001738 :term:`DEPLOY_DIR_RPM`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001739 Points to the area that the OpenEmbedded build system uses to place
1740 RPM packages that are ready to be used outside of the build system.
1741 This variable applies only when
1742 :term:`PACKAGE_CLASSES` contains
1743 "package_rpm".
1744
1745 The BitBake configuration file initially defines this variable as a
1746 sub-folder of :term:`DEPLOY_DIR`:
1747 ::
1748
1749 DEPLOY_DIR_RPM = "${DEPLOY_DIR}/rpm"
1750
1751 The :ref:`package_rpm <ref-classes-package_rpm>` class uses the
1752 ``DEPLOY_DIR_RPM`` variable to make sure the
1753 :ref:`ref-tasks-package_write_rpm` task
1754 writes RPM packages into the appropriate folder. For more information
Andrew Geissler09209ee2020-12-13 08:44:15 -06001755 on how packaging works, see the
1756 ":ref:`overview-manual/concepts:package feeds`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001757 in the Yocto Project Overview and Concepts Manual.
1758
Andrew Geisslerf0343792020-11-18 10:42:21 -06001759 :term:`DEPLOY_DIR_TAR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001760 Points to the area that the OpenEmbedded build system uses to place
1761 tarballs that are ready to be used outside of the build system. This
1762 variable applies only when
1763 :term:`PACKAGE_CLASSES` contains
1764 "package_tar".
1765
1766 The BitBake configuration file initially defines this variable as a
1767 sub-folder of :term:`DEPLOY_DIR`:
1768 ::
1769
1770 DEPLOY_DIR_TAR = "${DEPLOY_DIR}/tar"
1771
1772 The :ref:`package_tar <ref-classes-package_tar>` class uses the
1773 ``DEPLOY_DIR_TAR`` variable to make sure the
1774 :ref:`ref-tasks-package_write_tar` task
1775 writes TAR packages into the appropriate folder. For more information
Andrew Geissler09209ee2020-12-13 08:44:15 -06001776 on how packaging works, see the
1777 ":ref:`overview-manual/concepts:package feeds`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001778 in the Yocto Project Overview and Concepts Manual.
1779
Andrew Geisslerf0343792020-11-18 10:42:21 -06001780 :term:`DEPLOYDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001781 When inheriting the :ref:`deploy <ref-classes-deploy>` class, the
1782 ``DEPLOYDIR`` points to a temporary work area for deployed files that
1783 is set in the ``deploy`` class as follows:
1784 ::
1785
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001786 DEPLOYDIR = "${WORKDIR}/deploy-${PN}"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001787
1788 Recipes inheriting the ``deploy`` class should copy files to be
1789 deployed into ``DEPLOYDIR``, and the class will take care of copying
1790 them into :term:`DEPLOY_DIR_IMAGE`
1791 afterwards.
1792
Andrew Geisslerf0343792020-11-18 10:42:21 -06001793 :term:`DESCRIPTION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001794 The package description used by package managers. If not set,
1795 ``DESCRIPTION`` takes the value of the :term:`SUMMARY`
1796 variable.
1797
Andrew Geisslerf0343792020-11-18 10:42:21 -06001798 :term:`DISTRO`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001799 The short name of the distribution. For information on the long name
1800 of the distribution, see the :term:`DISTRO_NAME`
1801 variable.
1802
1803 The ``DISTRO`` variable corresponds to a distribution configuration
1804 file whose root name is the same as the variable's argument and whose
1805 filename extension is ``.conf``. For example, the distribution
1806 configuration file for the Poky distribution is named ``poky.conf``
1807 and resides in the ``meta-poky/conf/distro`` directory of the
1808 :term:`Source Directory`.
1809
1810 Within that ``poky.conf`` file, the ``DISTRO`` variable is set as
1811 follows:
1812 ::
1813
1814 DISTRO = "poky"
1815
1816 Distribution configuration files are located in a ``conf/distro``
1817 directory within the :term:`Metadata` that contains the
1818 distribution configuration. The value for ``DISTRO`` must not contain
1819 spaces, and is typically all lower-case.
1820
1821 .. note::
1822
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001823 If the ``DISTRO`` variable is blank, a set of default configurations
1824 are used, which are specified within
1825 ``meta/conf/distro/defaultsetup.conf`` also in the Source Directory.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001826
Andrew Geisslerf0343792020-11-18 10:42:21 -06001827 :term:`DISTRO_CODENAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001828 Specifies a codename for the distribution being built.
1829
Andrew Geisslerf0343792020-11-18 10:42:21 -06001830 :term:`DISTRO_EXTRA_RDEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001831 Specifies a list of distro-specific packages to add to all images.
1832 This variable takes affect through ``packagegroup-base`` so the
1833 variable only really applies to the more full-featured images that
1834 include ``packagegroup-base``. You can use this variable to keep
1835 distro policy out of generic images. As with all other distro
1836 variables, you set this variable in the distro ``.conf`` file.
1837
Andrew Geisslerf0343792020-11-18 10:42:21 -06001838 :term:`DISTRO_EXTRA_RRECOMMENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001839 Specifies a list of distro-specific packages to add to all images if
1840 the packages exist. The packages might not exist or be empty (e.g.
1841 kernel modules). The list of packages are automatically installed but
1842 you can remove them.
1843
Andrew Geisslerf0343792020-11-18 10:42:21 -06001844 :term:`DISTRO_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001845 The software support you want in your distribution for various
1846 features. You define your distribution features in the distribution
1847 configuration file.
1848
1849 In most cases, the presence or absence of a feature in
1850 ``DISTRO_FEATURES`` is translated to the appropriate option supplied
1851 to the configure script during the
1852 :ref:`ref-tasks-configure` task for recipes that
1853 optionally support the feature. For example, specifying "x11" in
1854 ``DISTRO_FEATURES``, causes every piece of software built for the
1855 target that can optionally support X11 to have its X11 support
1856 enabled.
1857
1858 Two more examples are Bluetooth and NFS support. For a more complete
1859 list of features that ships with the Yocto Project and that you can
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001860 provide with this variable, see the ":ref:`ref-features-distro`" section.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001861
Andrew Geisslerf0343792020-11-18 10:42:21 -06001862 :term:`DISTRO_FEATURES_BACKFILL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001863 Features to be added to ``DISTRO_FEATURES`` if not also present in
1864 ``DISTRO_FEATURES_BACKFILL_CONSIDERED``.
1865
1866 This variable is set in the ``meta/conf/bitbake.conf`` file. It is
1867 not intended to be user-configurable. It is best to just reference
1868 the variable to see which distro features are being backfilled for
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001869 all distro configurations. See the ":ref:`ref-features-backfill`" section
1870 for more information.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001871
Andrew Geisslerf0343792020-11-18 10:42:21 -06001872 :term:`DISTRO_FEATURES_BACKFILL_CONSIDERED`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001873 Features from ``DISTRO_FEATURES_BACKFILL`` that should not be
1874 backfilled (i.e. added to ``DISTRO_FEATURES``) during the build. See
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001875 the ":ref:`ref-features-backfill`" section for more information.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001876
Andrew Geisslerf0343792020-11-18 10:42:21 -06001877 :term:`DISTRO_FEATURES_DEFAULT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001878 A convenience variable that gives you the default list of distro
1879 features with the exception of any features specific to the C library
1880 (``libc``).
1881
1882 When creating a custom distribution, you might find it useful to be
1883 able to reuse the default
1884 :term:`DISTRO_FEATURES` options without the
1885 need to write out the full set. Here is an example that uses
1886 ``DISTRO_FEATURES_DEFAULT`` from a custom distro configuration file:
1887 ::
1888
1889 DISTRO_FEATURES ?= "${DISTRO_FEATURES_DEFAULT} myfeature"
1890
Andrew Geisslerf0343792020-11-18 10:42:21 -06001891 :term:`DISTRO_FEATURES_FILTER_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001892 Specifies a list of features that if present in the target
1893 :term:`DISTRO_FEATURES` value should be
1894 included in ``DISTRO_FEATURES`` when building native recipes. This
1895 variable is used in addition to the features filtered using the
1896 :term:`DISTRO_FEATURES_NATIVE`
1897 variable.
1898
Andrew Geisslerf0343792020-11-18 10:42:21 -06001899 :term:`DISTRO_FEATURES_FILTER_NATIVESDK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001900 Specifies a list of features that if present in the target
1901 :term:`DISTRO_FEATURES` value should be
1902 included in ``DISTRO_FEATURES`` when building nativesdk recipes. This
1903 variable is used in addition to the features filtered using the
1904 :term:`DISTRO_FEATURES_NATIVESDK`
1905 variable.
1906
Andrew Geisslerf0343792020-11-18 10:42:21 -06001907 :term:`DISTRO_FEATURES_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001908 Specifies a list of features that should be included in
1909 :term:`DISTRO_FEATURES` when building native
1910 recipes. This variable is used in addition to the features filtered
1911 using the
1912 :term:`DISTRO_FEATURES_FILTER_NATIVE`
1913 variable.
1914
Andrew Geisslerf0343792020-11-18 10:42:21 -06001915 :term:`DISTRO_FEATURES_NATIVESDK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001916 Specifies a list of features that should be included in
1917 :term:`DISTRO_FEATURES` when building
1918 nativesdk recipes. This variable is used in addition to the features
1919 filtered using the
1920 :term:`DISTRO_FEATURES_FILTER_NATIVESDK`
1921 variable.
1922
Andrew Geisslerf0343792020-11-18 10:42:21 -06001923 :term:`DISTRO_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001924 The long name of the distribution. For information on the short name
1925 of the distribution, see the :term:`DISTRO` variable.
1926
1927 The ``DISTRO_NAME`` variable corresponds to a distribution
1928 configuration file whose root name is the same as the variable's
1929 argument and whose filename extension is ``.conf``. For example, the
1930 distribution configuration file for the Poky distribution is named
1931 ``poky.conf`` and resides in the ``meta-poky/conf/distro`` directory
1932 of the :term:`Source Directory`.
1933
1934 Within that ``poky.conf`` file, the ``DISTRO_NAME`` variable is set
1935 as follows:
1936 ::
1937
1938 DISTRO_NAME = "Poky (Yocto Project Reference Distro)"
1939
1940 Distribution configuration files are located in a ``conf/distro``
1941 directory within the :term:`Metadata` that contains the
1942 distribution configuration.
1943
1944 .. note::
1945
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001946 If the ``DISTRO_NAME`` variable is blank, a set of default
1947 configurations are used, which are specified within
1948 ``meta/conf/distro/defaultsetup.conf`` also in the Source Directory.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001949
Andrew Geisslerf0343792020-11-18 10:42:21 -06001950 :term:`DISTRO_VERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001951 The version of the distribution.
1952
Andrew Geisslerf0343792020-11-18 10:42:21 -06001953 :term:`DISTROOVERRIDES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001954 A colon-separated list of overrides specific to the current
1955 distribution. By default, this list includes the value of
1956 :term:`DISTRO`.
1957
1958 You can extend ``DISTROOVERRIDES`` to add extra overrides that should
1959 apply to the distribution.
1960
1961 The underlying mechanism behind ``DISTROOVERRIDES`` is simply that it
1962 is included in the default value of
1963 :term:`OVERRIDES`.
1964
Andrew Geisslerf0343792020-11-18 10:42:21 -06001965 :term:`DL_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001966 The central download directory used by the build process to store
1967 downloads. By default, ``DL_DIR`` gets files suitable for mirroring
1968 for everything except Git repositories. If you want tarballs of Git
1969 repositories, use the
1970 :term:`BB_GENERATE_MIRROR_TARBALLS`
1971 variable.
1972
1973 You can set this directory by defining the ``DL_DIR`` variable in the
1974 ``conf/local.conf`` file. This directory is self-maintaining and you
1975 should not have to touch it. By default, the directory is
1976 ``downloads`` in the :term:`Build Directory`.
1977 ::
1978
1979 #DL_DIR ?= "${TOPDIR}/downloads"
1980
1981 To specify a different download directory,
1982 simply remove the comment from the line and provide your directory.
1983
1984 During a first build, the system downloads many different source code
1985 tarballs from various upstream projects. Downloading can take a
1986 while, particularly if your network connection is slow. Tarballs are
1987 all stored in the directory defined by ``DL_DIR`` and the build
1988 system looks there first to find source tarballs.
1989
1990 .. note::
1991
1992 When wiping and rebuilding, you can preserve this directory to
1993 speed up this part of subsequent builds.
1994
1995 You can safely share this directory between multiple builds on the
1996 same development machine. For additional information on how the build
1997 process gets source files when working behind a firewall or proxy
Andrew Geissler4c19ea12020-10-27 13:52:24 -05001998 server, see this specific question in the ":doc:`faq`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05001999 chapter. You can also refer to the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002000 ":yocto_wiki:`Working Behind a Network Proxy </Working_Behind_a_Network_Proxy>`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002001 Wiki page.
2002
Andrew Geisslerf0343792020-11-18 10:42:21 -06002003 :term:`DOC_COMPRESS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002004 When inheriting the :ref:`compress_doc <ref-classes-compress_doc>`
2005 class, this variable sets the compression policy used when the
2006 OpenEmbedded build system compresses man pages and info pages. By
2007 default, the compression method used is gz (gzip). Other policies
2008 available are xz and bz2.
2009
2010 For information on policies and on how to use this variable, see the
2011 comments in the ``meta/classes/compress_doc.bbclass`` file.
2012
Andrew Geisslerf0343792020-11-18 10:42:21 -06002013 :term:`EFI_PROVIDER`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002014 When building bootable images (i.e. where ``hddimg``, ``iso``, or
2015 ``wic.vmdk`` is in :term:`IMAGE_FSTYPES`), the
2016 ``EFI_PROVIDER`` variable specifies the EFI bootloader to use. The
2017 default is "grub-efi", but "systemd-boot" can be used instead.
2018
2019 See the :ref:`systemd-boot <ref-classes-systemd-boot>` and
2020 :ref:`image-live <ref-classes-image-live>` classes for more
2021 information.
2022
Andrew Geisslerf0343792020-11-18 10:42:21 -06002023 :term:`ENABLE_BINARY_LOCALE_GENERATION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002024 Variable that controls which locales for ``glibc`` are generated
2025 during the build (useful if the target device has 64Mbytes of RAM or
2026 less).
2027
Andrew Geisslerf0343792020-11-18 10:42:21 -06002028 :term:`ERR_REPORT_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002029 When used with the :ref:`report-error <ref-classes-report-error>`
2030 class, specifies the path used for storing the debug files created by
2031 the :ref:`error reporting
Andrew Geissler09209ee2020-12-13 08:44:15 -06002032 tool <dev-manual/common-tasks:using the error reporting tool>`, which
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002033 allows you to submit build errors you encounter to a central
2034 database. By default, the value of this variable is
2035 ``${``\ :term:`LOG_DIR`\ ``}/error-report``.
2036
2037 You can set ``ERR_REPORT_DIR`` to the path you want the error
2038 reporting tool to store the debug files as follows in your
2039 ``local.conf`` file:
2040 ::
2041
2042 ERR_REPORT_DIR = "path"
2043
Andrew Geisslerf0343792020-11-18 10:42:21 -06002044 :term:`ERROR_QA`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002045 Specifies the quality assurance checks whose failures are reported as
2046 errors by the OpenEmbedded build system. You set this variable in
2047 your distribution configuration file. For a list of the checks you
2048 can control with this variable, see the
2049 ":ref:`insane.bbclass <ref-classes-insane>`" section.
2050
Andrew Geisslerf0343792020-11-18 10:42:21 -06002051 :term:`EXCLUDE_FROM_SHLIBS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002052 Triggers the OpenEmbedded build system's shared libraries resolver to
2053 exclude an entire package when scanning for shared libraries.
2054
2055 .. note::
2056
2057 The shared libraries resolver's functionality results in part from
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002058 the internal function ``package_do_shlibs``, which is part of the
2059 :ref:`ref-tasks-package` task. You should be aware that the shared
2060 libraries resolver might implicitly define some dependencies between
2061 packages.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002062
2063 The ``EXCLUDE_FROM_SHLIBS`` variable is similar to the
2064 :term:`PRIVATE_LIBS` variable, which excludes a
2065 package's particular libraries only and not the whole package.
2066
2067 Use the ``EXCLUDE_FROM_SHLIBS`` variable by setting it to "1" for a
2068 particular package:
2069 ::
2070
2071 EXCLUDE_FROM_SHLIBS = "1"
2072
Andrew Geisslerf0343792020-11-18 10:42:21 -06002073 :term:`EXCLUDE_FROM_WORLD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002074 Directs BitBake to exclude a recipe from world builds (i.e.
2075 ``bitbake world``). During world builds, BitBake locates, parses and
2076 builds all recipes found in every layer exposed in the
2077 ``bblayers.conf`` configuration file.
2078
2079 To exclude a recipe from a world build using this variable, set the
2080 variable to "1" in the recipe.
2081
2082 .. note::
2083
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002084 Recipes added to ``EXCLUDE_FROM_WORLD`` may still be built during a
2085 world build in order to satisfy dependencies of other recipes. Adding
2086 a recipe to ``EXCLUDE_FROM_WORLD`` only ensures that the recipe is not
2087 explicitly added to the list of build targets in a world build.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002088
Andrew Geisslerf0343792020-11-18 10:42:21 -06002089 :term:`EXTENDPE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002090 Used with file and pathnames to create a prefix for a recipe's
2091 version based on the recipe's :term:`PE` value. If ``PE``
2092 is set and greater than zero for a recipe, ``EXTENDPE`` becomes that
2093 value (e.g if ``PE`` is equal to "1" then ``EXTENDPE`` becomes "1").
2094 If a recipe's ``PE`` is not set (the default) or is equal to zero,
2095 ``EXTENDPE`` becomes "".
2096
2097 See the :term:`STAMP` variable for an example.
2098
Andrew Geisslerf0343792020-11-18 10:42:21 -06002099 :term:`EXTENDPKGV`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002100 The full package version specification as it appears on the final
2101 packages produced by a recipe. The variable's value is normally used
2102 to fix a runtime dependency to the exact same version of another
2103 package in the same recipe:
2104 ::
2105
2106 RDEPENDS_${PN}-additional-module = "${PN} (= ${EXTENDPKGV})"
2107
2108 The dependency relationships are intended to force the package
2109 manager to upgrade these types of packages in lock-step.
2110
Andrew Geisslerf0343792020-11-18 10:42:21 -06002111 :term:`EXTERNAL_KERNEL_TOOLS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002112 When set, the ``EXTERNAL_KERNEL_TOOLS`` variable indicates that these
2113 tools are not in the source tree.
2114
2115 When kernel tools are available in the tree, they are preferred over
2116 any externally installed tools. Setting the ``EXTERNAL_KERNEL_TOOLS``
2117 variable tells the OpenEmbedded build system to prefer the installed
2118 external tools. See the
2119 :ref:`kernel-yocto <ref-classes-kernel-yocto>` class in
2120 ``meta/classes`` to see how the variable is used.
2121
Andrew Geisslerf0343792020-11-18 10:42:21 -06002122 :term:`EXTERNALSRC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002123 When inheriting the :ref:`externalsrc <ref-classes-externalsrc>`
2124 class, this variable points to the source tree, which is outside of
2125 the OpenEmbedded build system. When set, this variable sets the
2126 :term:`S` variable, which is what the OpenEmbedded build
2127 system uses to locate unpacked recipe source code.
2128
2129 For more information on ``externalsrc.bbclass``, see the
2130 ":ref:`externalsrc.bbclass <ref-classes-externalsrc>`" section. You
2131 can also find information on how to use this variable in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002132 ":ref:`dev-manual/common-tasks:building software from an external source`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002133 section in the Yocto Project Development Tasks Manual.
2134
Andrew Geisslerf0343792020-11-18 10:42:21 -06002135 :term:`EXTERNALSRC_BUILD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002136 When inheriting the :ref:`externalsrc <ref-classes-externalsrc>`
2137 class, this variable points to the directory in which the recipe's
2138 source code is built, which is outside of the OpenEmbedded build
2139 system. When set, this variable sets the :term:`B` variable,
2140 which is what the OpenEmbedded build system uses to locate the Build
2141 Directory.
2142
2143 For more information on ``externalsrc.bbclass``, see the
2144 ":ref:`externalsrc.bbclass <ref-classes-externalsrc>`" section. You
2145 can also find information on how to use this variable in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002146 ":ref:`dev-manual/common-tasks:building software from an external source`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002147 section in the Yocto Project Development Tasks Manual.
2148
Andrew Geisslerf0343792020-11-18 10:42:21 -06002149 :term:`EXTRA_AUTORECONF`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002150 For recipes inheriting the :ref:`autotools <ref-classes-autotools>`
2151 class, you can use ``EXTRA_AUTORECONF`` to specify extra options to
2152 pass to the ``autoreconf`` command that is executed during the
2153 :ref:`ref-tasks-configure` task.
2154
2155 The default value is "--exclude=autopoint".
2156
Andrew Geisslerf0343792020-11-18 10:42:21 -06002157 :term:`EXTRA_IMAGE_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002158 A list of additional features to include in an image. When listing
2159 more than one feature, separate them with a space.
2160
2161 Typically, you configure this variable in your ``local.conf`` file,
2162 which is found in the :term:`Build Directory`.
2163 Although you can use this variable from within a recipe, best
2164 practices dictate that you do not.
2165
2166 .. note::
2167
2168 To enable primary features from within the image recipe, use the
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002169 :term:`IMAGE_FEATURES` variable.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002170
2171 Here are some examples of features you can add:
2172
2173 - "dbg-pkgs" - Adds -dbg packages for all installed packages including
2174 symbol information for debugging and profiling.
2175
2176 - "debug-tweaks" - Makes an image suitable for debugging. For example, allows root logins without passwords and
2177 enables post-installation logging. See the 'allow-empty-password' and
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002178 'post-install-logging' features in the ":ref:`ref-features-image`"
2179 section for more information.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002180 - "dev-pkgs" - Adds -dev packages for all installed packages. This is
2181 useful if you want to develop against the libraries in the image.
2182 - "read-only-rootfs" - Creates an image whose root filesystem is
2183 read-only. See the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002184 ":ref:`dev-manual/common-tasks:creating a read-only root filesystem`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002185 section in the Yocto Project Development Tasks Manual for more
2186 information
2187 - "tools-debug" - Adds debugging tools such as gdb and strace.
2188 - "tools-sdk" - Adds development tools such as gcc, make,
2189 pkgconfig and so forth.
2190 - "tools-testapps" - Adds useful testing tools
2191 such as ts_print, aplay, arecord and so forth.
2192
2193 For a complete list of image features that ships with the Yocto
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002194 Project, see the ":ref:`ref-features-image`" section.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002195
2196 For an example that shows how to customize your image by using this
Andrew Geissler09209ee2020-12-13 08:44:15 -06002197 variable, see the ":ref:`dev-manual/common-tasks:customizing images using custom \`\`image_features\`\` and \`\`extra_image_features\`\``"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002198 section in the Yocto Project Development Tasks Manual.
2199
Andrew Geisslerf0343792020-11-18 10:42:21 -06002200 :term:`EXTRA_IMAGECMD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002201 Specifies additional options for the image creation command that has
2202 been specified in :term:`IMAGE_CMD`. When setting
2203 this variable, use an override for the associated image type. Here is
2204 an example:
2205 ::
2206
2207 EXTRA_IMAGECMD_ext3 ?= "-i 4096"
2208
Andrew Geisslerf0343792020-11-18 10:42:21 -06002209 :term:`EXTRA_IMAGEDEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002210 A list of recipes to build that do not provide packages for
2211 installing into the root filesystem.
2212
2213 Sometimes a recipe is required to build the final image but is not
2214 needed in the root filesystem. You can use the ``EXTRA_IMAGEDEPENDS``
2215 variable to list these recipes and thus specify the dependencies. A
2216 typical example is a required bootloader in a machine configuration.
2217
2218 .. note::
2219
2220 To add packages to the root filesystem, see the various
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002221 \*:term:`RDEPENDS` and \*:term:`RRECOMMENDS` variables.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002222
Andrew Geisslerf0343792020-11-18 10:42:21 -06002223 :term:`EXTRANATIVEPATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002224 A list of subdirectories of
2225 ``${``\ :term:`STAGING_BINDIR_NATIVE`\ ``}``
2226 added to the beginning of the environment variable ``PATH``. As an
2227 example, the following prepends
2228 "${STAGING_BINDIR_NATIVE}/foo:${STAGING_BINDIR_NATIVE}/bar:" to
2229 ``PATH``:
2230 ::
2231
2232 EXTRANATIVEPATH = "foo bar"
2233
Andrew Geisslerf0343792020-11-18 10:42:21 -06002234 :term:`EXTRA_OECMAKE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002235 Additional `CMake <https://cmake.org/overview/>`__ options. See the
2236 :ref:`cmake <ref-classes-cmake>` class for additional information.
2237
Andrew Geisslerf0343792020-11-18 10:42:21 -06002238 :term:`EXTRA_OECONF`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002239 Additional ``configure`` script options. See
2240 :term:`PACKAGECONFIG_CONFARGS` for
2241 additional information on passing configure script options.
2242
Andrew Geisslerf0343792020-11-18 10:42:21 -06002243 :term:`EXTRA_OEMAKE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002244 Additional GNU ``make`` options.
2245
2246 Because the ``EXTRA_OEMAKE`` defaults to "", you need to set the
2247 variable to specify any required GNU options.
2248
2249 :term:`PARALLEL_MAKE` and
2250 :term:`PARALLEL_MAKEINST` also make use of
2251 ``EXTRA_OEMAKE`` to pass the required flags.
2252
Andrew Geisslerf0343792020-11-18 10:42:21 -06002253 :term:`EXTRA_OESCONS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002254 When inheriting the :ref:`scons <ref-classes-scons>` class, this
2255 variable specifies additional configuration options you want to pass
2256 to the ``scons`` command line.
2257
Andrew Geisslerf0343792020-11-18 10:42:21 -06002258 :term:`EXTRA_USERS_PARAMS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002259 When inheriting the :ref:`extrausers <ref-classes-extrausers>`
2260 class, this variable provides image level user and group operations.
2261 This is a more global method of providing user and group
2262 configuration as compared to using the
2263 :ref:`useradd <ref-classes-useradd>` class, which ties user and
2264 group configurations to a specific recipe.
2265
2266 The set list of commands you can configure using the
2267 ``EXTRA_USERS_PARAMS`` is shown in the ``extrausers`` class. These
2268 commands map to the normal Unix commands of the same names:
2269 ::
2270
2271 # EXTRA_USERS_PARAMS = "\
2272 # useradd -p '' tester; \
2273 # groupadd developers; \
2274 # userdel nobody; \
2275 # groupdel -g video; \
2276 # groupmod -g 1020 developers; \
2277 # usermod -s /bin/sh tester; \
2278 # "
2279
Andrew Geisslerf0343792020-11-18 10:42:21 -06002280 :term:`FEATURE_PACKAGES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002281 Defines one or more packages to include in an image when a specific
2282 item is included in :term:`IMAGE_FEATURES`.
2283 When setting the value, ``FEATURE_PACKAGES`` should have the name of
2284 the feature item as an override. Here is an example:
2285 ::
2286
2287 FEATURE_PACKAGES_widget = "package1 package2"
2288
2289 In this example, if "widget" were added to ``IMAGE_FEATURES``,
2290 package1 and package2 would be included in the image.
2291
2292 .. note::
2293
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002294 Packages installed by features defined through ``FEATURE_PACKAGES``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002295 are often package groups. While similarly named, you should not
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002296 confuse the ``FEATURE_PACKAGES`` variable with package groups, which
2297 are discussed elsewhere in the documentation.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002298
Andrew Geisslerf0343792020-11-18 10:42:21 -06002299 :term:`FEED_DEPLOYDIR_BASE_URI`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002300 Points to the base URL of the server and location within the
2301 document-root that provides the metadata and packages required by
2302 OPKG to support runtime package management of IPK packages. You set
2303 this variable in your ``local.conf`` file.
2304
2305 Consider the following example:
2306 ::
2307
2308 FEED_DEPLOYDIR_BASE_URI = "http://192.168.7.1/BOARD-dir"
2309
2310 This example assumes you are serving
2311 your packages over HTTP and your databases are located in a directory
2312 named ``BOARD-dir``, which is underneath your HTTP server's
2313 document-root. In this case, the OpenEmbedded build system generates
2314 a set of configuration files for you in your target that work with
2315 the feed.
2316
Andrew Geisslerf0343792020-11-18 10:42:21 -06002317 :term:`FILES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002318 The list of files and directories that are placed in a package. The
2319 :term:`PACKAGES` variable lists the packages
2320 generated by a recipe.
2321
2322 To use the ``FILES`` variable, provide a package name override that
2323 identifies the resulting package. Then, provide a space-separated
2324 list of files or paths that identify the files you want included as
2325 part of the resulting package. Here is an example:
2326 ::
2327
2328 FILES_${PN} += "${bindir}/mydir1 ${bindir}/mydir2/myfile"
2329
2330 .. note::
2331
2332 - When specifying files or paths, you can pattern match using
2333 Python's
2334 `glob <https://docs.python.org/3/library/glob.html>`_
2335 syntax. For details on the syntax, see the documentation by
2336 following the previous link.
2337
2338 - When specifying paths as part of the ``FILES`` variable, it is
2339 good practice to use appropriate path variables. For example,
2340 use ``${sysconfdir}`` rather than ``/etc``, or ``${bindir}``
2341 rather than ``/usr/bin``. You can find a list of these
2342 variables at the top of the ``meta/conf/bitbake.conf`` file in
2343 the :term:`Source Directory`. You will also
2344 find the default values of the various ``FILES_*`` variables in
2345 this file.
2346
2347 If some of the files you provide with the ``FILES`` variable are
2348 editable and you know they should not be overwritten during the
2349 package update process by the Package Management System (PMS), you
2350 can identify these files so that the PMS will not overwrite them. See
2351 the :term:`CONFFILES` variable for information on
2352 how to identify these files to the PMS.
2353
Andrew Geisslerf0343792020-11-18 10:42:21 -06002354 :term:`FILES_SOLIBSDEV`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002355 Defines the file specification to match
2356 :term:`SOLIBSDEV`. In other words,
2357 ``FILES_SOLIBSDEV`` defines the full path name of the development
2358 symbolic link (symlink) for shared libraries on the target platform.
2359
2360 The following statement from the ``bitbake.conf`` shows how it is
2361 set:
2362 ::
2363
2364 FILES_SOLIBSDEV ?= "${base_libdir}/lib*${SOLIBSDEV} ${libdir}/lib*${SOLIBSDEV}"
2365
Andrew Geisslerf0343792020-11-18 10:42:21 -06002366 :term:`FILESEXTRAPATHS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002367 Extends the search path the OpenEmbedded build system uses when
2368 looking for files and patches as it processes recipes and append
2369 files. The default directories BitBake uses when it processes recipes
2370 are initially defined by the :term:`FILESPATH`
2371 variable. You can extend ``FILESPATH`` variable by using
2372 ``FILESEXTRAPATHS``.
2373
2374 Best practices dictate that you accomplish this by using
2375 ``FILESEXTRAPATHS`` from within a ``.bbappend`` file and that you
2376 prepend paths as follows:
2377 ::
2378
2379 FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
2380
2381 In the above example, the build system first
2382 looks for files in a directory that has the same name as the
2383 corresponding append file.
2384
2385 .. note::
2386
2387 When extending ``FILESEXTRAPATHS``, be sure to use the immediate
2388 expansion (``:=``) operator. Immediate expansion makes sure that
2389 BitBake evaluates :term:`THISDIR` at the time the
2390 directive is encountered rather than at some later time when
2391 expansion might result in a directory that does not contain the
2392 files you need.
2393
2394 Also, include the trailing separating colon character if you are
2395 prepending. The trailing colon character is necessary because you
2396 are directing BitBake to extend the path by prepending directories
2397 to the search path.
2398
2399 Here is another common use:
2400 ::
2401
2402 FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
2403
2404 In this example, the build system extends the
2405 ``FILESPATH`` variable to include a directory named ``files`` that is
2406 in the same directory as the corresponding append file.
2407
2408 This next example specifically adds three paths:
2409 ::
2410
2411 FILESEXTRAPATHS_prepend := "path_1:path_2:path_3:"
2412
2413 A final example shows how you can extend the search path and include
2414 a :term:`MACHINE`-specific override, which is useful
2415 in a BSP layer:
2416 ::
2417
2418 FILESEXTRAPATHS_prepend_intel-x86-common := "${THISDIR}/${PN}:"
2419
2420 The previous statement appears in the
2421 ``linux-yocto-dev.bbappend`` file, which is found in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002422 :ref:`overview-manual/development-environment:yocto project source repositories` in
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002423 ``meta-intel/common/recipes-kernel/linux``. Here, the machine
2424 override is a special :term:`PACKAGE_ARCH`
2425 definition for multiple ``meta-intel`` machines.
2426
2427 .. note::
2428
2429 For a layer that supports a single BSP, the override could just be
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002430 the value of ``MACHINE``.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002431
2432 By prepending paths in ``.bbappend`` files, you allow multiple append
2433 files that reside in different layers but are used for the same
2434 recipe to correctly extend the path.
2435
Andrew Geisslerf0343792020-11-18 10:42:21 -06002436 :term:`FILESOVERRIDES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002437 A subset of :term:`OVERRIDES` used by the
2438 OpenEmbedded build system for creating
2439 :term:`FILESPATH`. The ``FILESOVERRIDES`` variable
2440 uses overrides to automatically extend the
2441 :term:`FILESPATH` variable. For an example of how
2442 that works, see the :term:`FILESPATH` variable
2443 description. Additionally, you find more information on how overrides
2444 are handled in the
2445 ":ref:`bitbake:bitbake-user-manual/bitbake-user-manual-metadata:conditional syntax (overrides)`"
2446 section of the BitBake User Manual.
2447
2448 By default, the ``FILESOVERRIDES`` variable is defined as:
2449 ::
2450
2451 FILESOVERRIDES = "${TRANSLATED_TARGET_ARCH}:${MACHINEOVERRIDES}:${DISTROOVERRIDES}"
2452
2453 .. note::
2454
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002455 Do not hand-edit the ``FILESOVERRIDES`` variable. The values match up
2456 with expected overrides and are used in an expected manner by the
2457 build system.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002458
Andrew Geisslerf0343792020-11-18 10:42:21 -06002459 :term:`FILESPATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002460 The default set of directories the OpenEmbedded build system uses
2461 when searching for patches and files.
2462
2463 During the build process, BitBake searches each directory in
2464 ``FILESPATH`` in the specified order when looking for files and
2465 patches specified by each ``file://`` URI in a recipe's
2466 :term:`SRC_URI` statements.
2467
2468 The default value for the ``FILESPATH`` variable is defined in the
2469 ``base.bbclass`` class found in ``meta/classes`` in the
2470 :term:`Source Directory`:
2471 ::
2472
2473 FILESPATH = "${@base_set_filespath(["${FILE_DIRNAME}/${BP}", \
2474 "${FILE_DIRNAME}/${BPN}", "${FILE_DIRNAME}/files"], d)}"
2475
2476 The
2477 ``FILESPATH`` variable is automatically extended using the overrides
2478 from the :term:`FILESOVERRIDES` variable.
2479
2480 .. note::
2481
2482 - Do not hand-edit the ``FILESPATH`` variable. If you want the
2483 build system to look in directories other than the defaults,
2484 extend the ``FILESPATH`` variable by using the
2485 :term:`FILESEXTRAPATHS` variable.
2486
2487 - Be aware that the default ``FILESPATH`` directories do not map
2488 to directories in custom layers where append files
2489 (``.bbappend``) are used. If you want the build system to find
2490 patches or files that reside with your append files, you need
2491 to extend the ``FILESPATH`` variable by using the
2492 ``FILESEXTRAPATHS`` variable.
2493
2494 You can take advantage of this searching behavior in useful ways. For
2495 example, consider a case where the following directory structure
2496 exists for general and machine-specific configurations:
2497 ::
2498
2499 files/defconfig
2500 files/MACHINEA/defconfig
2501 files/MACHINEB/defconfig
2502
2503 Also in the example, the ``SRC_URI`` statement contains
2504 "file://defconfig". Given this scenario, you can set
2505 :term:`MACHINE` to "MACHINEA" and cause the build
2506 system to use files from ``files/MACHINEA``. Set ``MACHINE`` to
2507 "MACHINEB" and the build system uses files from ``files/MACHINEB``.
2508 Finally, for any machine other than "MACHINEA" and "MACHINEB", the
2509 build system uses files from ``files/defconfig``.
2510
2511 You can find out more about the patching process in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002512 ":ref:`overview-manual/concepts:patching`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002513 in the Yocto Project Overview and Concepts Manual and the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002514 ":ref:`dev-manual/common-tasks:patching code`" section in
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002515 the Yocto Project Development Tasks Manual. See the
2516 :ref:`ref-tasks-patch` task as well.
2517
Andrew Geisslerf0343792020-11-18 10:42:21 -06002518 :term:`FILESYSTEM_PERMS_TABLES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002519 Allows you to define your own file permissions settings table as part
2520 of your configuration for the packaging process. For example, suppose
2521 you need a consistent set of custom permissions for a set of groups
2522 and users across an entire work project. It is best to do this in the
2523 packages themselves but this is not always possible.
2524
2525 By default, the OpenEmbedded build system uses the ``fs-perms.txt``,
2526 which is located in the ``meta/files`` folder in the :term:`Source Directory`.
2527 If you create your own file
2528 permissions setting table, you should place it in your layer or the
2529 distro's layer.
2530
2531 You define the ``FILESYSTEM_PERMS_TABLES`` variable in the
2532 ``conf/local.conf`` file, which is found in the :term:`Build Directory`,
2533 to point to your custom
2534 ``fs-perms.txt``. You can specify more than a single file permissions
2535 setting table. The paths you specify to these files must be defined
2536 within the :term:`BBPATH` variable.
2537
2538 For guidance on how to create your own file permissions settings
2539 table file, examine the existing ``fs-perms.txt``.
2540
Andrew Geisslerf0343792020-11-18 10:42:21 -06002541 :term:`FIT_GENERATE_KEYS`
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002542 Decides whether to generate the keys for signing fitImage if they
2543 don't already exist. The keys are created in ``UBOOT_SIGN_KEYDIR``.
2544 The default value is 0.
2545
Andrew Geisslerf0343792020-11-18 10:42:21 -06002546 :term:`FIT_HASH_ALG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002547 Specifies the hash algorithm used in creating the FIT Image. For e.g. sha256.
2548
Andrew Geisslerf0343792020-11-18 10:42:21 -06002549 :term:`FIT_KEY_GENRSA_ARGS`
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002550 Arguments to openssl genrsa for generating RSA private key for signing
2551 fitImage. The default value is "-F4". i.e. the public exponent 65537 to
2552 use.
2553
Andrew Geisslerf0343792020-11-18 10:42:21 -06002554 :term:`FIT_KEY_REQ_ARGS`
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002555 Arguments to openssl req for generating certificate for signing fitImage.
2556 The default value is "-batch -new". batch for non interactive mode
2557 and new for generating new keys.
2558
Andrew Geisslerf0343792020-11-18 10:42:21 -06002559 :term:`FIT_KEY_SIGN_PKCS`
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002560 Format for public key ceritifcate used in signing fitImage.
2561 The default value is "x509".
2562
Andrew Geisslerf0343792020-11-18 10:42:21 -06002563 :term:`FIT_SIGN_ALG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002564 Specifies the signature algorithm used in creating the FIT Image.
2565 For e.g. rsa2048.
2566
Andrew Geisslerf0343792020-11-18 10:42:21 -06002567 :term:`FIT_SIGN_NUMBITS`
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002568 Size of private key in number of bits used in fitImage. The default
2569 value is "2048".
2570
Andrew Geisslerf0343792020-11-18 10:42:21 -06002571 :term:`FONT_EXTRA_RDEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002572 When inheriting the :ref:`fontcache <ref-classes-fontcache>` class,
2573 this variable specifies the runtime dependencies for font packages.
2574 By default, the ``FONT_EXTRA_RDEPENDS`` is set to "fontconfig-utils".
2575
Andrew Geisslerf0343792020-11-18 10:42:21 -06002576 :term:`FONT_PACKAGES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002577 When inheriting the :ref:`fontcache <ref-classes-fontcache>` class,
2578 this variable identifies packages containing font files that need to
2579 be cached by Fontconfig. By default, the ``fontcache`` class assumes
2580 that fonts are in the recipe's main package (i.e.
2581 ``${``\ :term:`PN`\ ``}``). Use this variable if fonts you
2582 need are in a package other than that main package.
2583
Andrew Geisslerf0343792020-11-18 10:42:21 -06002584 :term:`FORCE_RO_REMOVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002585 Forces the removal of the packages listed in ``ROOTFS_RO_UNNEEDED``
2586 during the generation of the root filesystem.
2587
2588 Set the variable to "1" to force the removal of these packages.
2589
Andrew Geisslerf0343792020-11-18 10:42:21 -06002590 :term:`FULL_OPTIMIZATION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002591 The options to pass in ``TARGET_CFLAGS`` and ``CFLAGS`` when
2592 compiling an optimized system. This variable defaults to "-O2 -pipe
2593 ${DEBUG_FLAGS}".
2594
Andrew Geisslerf0343792020-11-18 10:42:21 -06002595 :term:`GCCPIE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002596 Enables Position Independent Executables (PIE) within the GNU C
2597 Compiler (GCC). Enabling PIE in the GCC makes Return Oriented
2598 Programming (ROP) attacks much more difficult to execute.
2599
2600 By default the ``security_flags.inc`` file enables PIE by setting the
2601 variable as follows:
2602 ::
2603
2604 GCCPIE ?= "--enable-default-pie"
2605
Andrew Geisslerf0343792020-11-18 10:42:21 -06002606 :term:`GCCVERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002607 Specifies the default version of the GNU C Compiler (GCC) used for
2608 compilation. By default, ``GCCVERSION`` is set to "8.x" in the
2609 ``meta/conf/distro/include/tcmode-default.inc`` include file:
2610 ::
2611
2612 GCCVERSION ?= "8.%"
2613
2614 You can override this value by setting it in a
2615 configuration file such as the ``local.conf``.
2616
Andrew Geisslerf0343792020-11-18 10:42:21 -06002617 :term:`GDB`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002618 The minimal command and arguments to run the GNU Debugger.
2619
Andrew Geisslerf0343792020-11-18 10:42:21 -06002620 :term:`GITDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002621 The directory in which a local copy of a Git repository is stored
2622 when it is cloned.
2623
Andrew Geisslerf0343792020-11-18 10:42:21 -06002624 :term:`GLIBC_GENERATE_LOCALES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002625 Specifies the list of GLIBC locales to generate should you not wish
2626 to generate all LIBC locals, which can be time consuming.
2627
2628 .. note::
2629
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002630 If you specifically remove the locale ``en_US.UTF-8``, you must set
2631 :term:`IMAGE_LINGUAS` appropriately.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002632
2633 You can set ``GLIBC_GENERATE_LOCALES`` in your ``local.conf`` file.
2634 By default, all locales are generated.
2635 ::
2636
2637 GLIBC_GENERATE_LOCALES = "en_GB.UTF-8 en_US.UTF-8"
2638
Andrew Geisslerf0343792020-11-18 10:42:21 -06002639 :term:`GROUPADD_PARAM`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002640 When inheriting the :ref:`useradd <ref-classes-useradd>` class,
2641 this variable specifies for a package what parameters should be
2642 passed to the ``groupadd`` command if you wish to add a group to the
2643 system when the package is installed.
2644
2645 Here is an example from the ``dbus`` recipe:
2646 ::
2647
2648 GROUPADD_PARAM_${PN} = "-r netdev"
2649
2650 For information on the standard Linux shell command
Andrew Geissler706d5aa2021-02-12 15:55:30 -06002651 ``groupadd``, see http://linux.die.net/man/8/groupadd.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002652
Andrew Geisslerf0343792020-11-18 10:42:21 -06002653 :term:`GROUPMEMS_PARAM`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002654 When inheriting the :ref:`useradd <ref-classes-useradd>` class,
2655 this variable specifies for a package what parameters should be
2656 passed to the ``groupmems`` command if you wish to modify the members
2657 of a group when the package is installed.
2658
2659 For information on the standard Linux shell command ``groupmems``,
Andrew Geissler706d5aa2021-02-12 15:55:30 -06002660 see http://linux.die.net/man/8/groupmems.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002661
Andrew Geisslerf0343792020-11-18 10:42:21 -06002662 :term:`GRUB_GFXSERIAL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002663 Configures the GNU GRand Unified Bootloader (GRUB) to have graphics
2664 and serial in the boot menu. Set this variable to "1" in your
2665 ``local.conf`` or distribution configuration file to enable graphics
2666 and serial in the menu.
2667
2668 See the :ref:`grub-efi <ref-classes-grub-efi>` class for more
2669 information on how this variable is used.
2670
Andrew Geisslerf0343792020-11-18 10:42:21 -06002671 :term:`GRUB_OPTS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002672 Additional options to add to the GNU GRand Unified Bootloader (GRUB)
2673 configuration. Use a semi-colon character (``;``) to separate
2674 multiple options.
2675
2676 The ``GRUB_OPTS`` variable is optional. See the
2677 :ref:`grub-efi <ref-classes-grub-efi>` class for more information
2678 on how this variable is used.
2679
Andrew Geisslerf0343792020-11-18 10:42:21 -06002680 :term:`GRUB_TIMEOUT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002681 Specifies the timeout before executing the default ``LABEL`` in the
2682 GNU GRand Unified Bootloader (GRUB).
2683
2684 The ``GRUB_TIMEOUT`` variable is optional. See the
2685 :ref:`grub-efi <ref-classes-grub-efi>` class for more information
2686 on how this variable is used.
2687
Andrew Geisslerf0343792020-11-18 10:42:21 -06002688 :term:`GTKIMMODULES_PACKAGES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002689 When inheriting the
2690 :ref:`gtk-immodules-cache <ref-classes-gtk-immodules-cache>` class,
2691 this variable specifies the packages that contain the GTK+ input
2692 method modules being installed when the modules are in packages other
2693 than the main package.
2694
Andrew Geisslerf0343792020-11-18 10:42:21 -06002695 :term:`HOMEPAGE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002696 Website where more information about the software the recipe is
2697 building can be found.
2698
Andrew Geisslerf0343792020-11-18 10:42:21 -06002699 :term:`HOST_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002700 The name of the target architecture, which is normally the same as
2701 :term:`TARGET_ARCH`. The OpenEmbedded build system
2702 supports many architectures. Here is an example list of architectures
2703 supported. This list is by no means complete as the architecture is
2704 configurable:
2705
2706 - arm
2707 - i586
2708 - x86_64
2709 - powerpc
2710 - powerpc64
2711 - mips
2712 - mipsel
2713
Andrew Geisslerf0343792020-11-18 10:42:21 -06002714 :term:`HOST_CC_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002715 Specifies architecture-specific compiler flags that are passed to the
2716 C compiler.
2717
2718 Default initialization for ``HOST_CC_ARCH`` varies depending on what
2719 is being built:
2720
2721 - :term:`TARGET_CC_ARCH` when building for the
2722 target
2723
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002724 - :term:`BUILD_CC_ARCH` when building for the build host (i.e.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002725 ``-native``)
2726
2727 - ``BUILDSDK_CC_ARCH`` when building for an SDK (i.e.
2728 ``nativesdk-``)
2729
Andrew Geisslerf0343792020-11-18 10:42:21 -06002730 :term:`HOST_OS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002731 Specifies the name of the target operating system, which is normally
2732 the same as the :term:`TARGET_OS`. The variable can
2733 be set to "linux" for ``glibc``-based systems and to "linux-musl" for
2734 ``musl``. For ARM/EABI targets, there are also "linux-gnueabi" and
2735 "linux-musleabi" values possible.
2736
Andrew Geisslerf0343792020-11-18 10:42:21 -06002737 :term:`HOST_PREFIX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002738 Specifies the prefix for the cross-compile toolchain. ``HOST_PREFIX``
2739 is normally the same as :term:`TARGET_PREFIX`.
2740
Andrew Geisslerf0343792020-11-18 10:42:21 -06002741 :term:`HOST_SYS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002742 Specifies the system, including the architecture and the operating
2743 system, for which the build is occurring in the context of the
2744 current recipe.
2745
2746 The OpenEmbedded build system automatically sets this variable based
2747 on :term:`HOST_ARCH`,
2748 :term:`HOST_VENDOR`, and
2749 :term:`HOST_OS` variables.
2750
2751 .. note::
2752
2753 You do not need to set the variable yourself.
2754
2755 Consider these two examples:
2756
2757 - Given a native recipe on a 32-bit x86 machine running Linux, the
2758 value is "i686-linux".
2759
2760 - Given a recipe being built for a little-endian MIPS target running
2761 Linux, the value might be "mipsel-linux".
2762
Andrew Geisslerf0343792020-11-18 10:42:21 -06002763 :term:`HOSTTOOLS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002764 A space-separated list (filter) of tools on the build host that
2765 should be allowed to be called from within build tasks. Using this
2766 filter helps reduce the possibility of host contamination. If a tool
2767 specified in the value of ``HOSTTOOLS`` is not found on the build
2768 host, the OpenEmbedded build system produces an error and the build
2769 is not started.
2770
2771 For additional information, see
2772 :term:`HOSTTOOLS_NONFATAL`.
2773
Andrew Geisslerf0343792020-11-18 10:42:21 -06002774 :term:`HOSTTOOLS_NONFATAL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002775 A space-separated list (filter) of tools on the build host that
2776 should be allowed to be called from within build tasks. Using this
2777 filter helps reduce the possibility of host contamination. Unlike
2778 :term:`HOSTTOOLS`, the OpenEmbedded build system
2779 does not produce an error if a tool specified in the value of
2780 ``HOSTTOOLS_NONFATAL`` is not found on the build host. Thus, you can
2781 use ``HOSTTOOLS_NONFATAL`` to filter optional host tools.
2782
Andrew Geisslerf0343792020-11-18 10:42:21 -06002783 :term:`HOST_VENDOR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002784 Specifies the name of the vendor. ``HOST_VENDOR`` is normally the
2785 same as :term:`TARGET_VENDOR`.
2786
Andrew Geisslerf0343792020-11-18 10:42:21 -06002787 :term:`ICECC_DISABLED`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002788 Disables or enables the ``icecc`` (Icecream) function. For more
2789 information on this function and best practices for using this
2790 variable, see the ":ref:`icecc.bbclass <ref-classes-icecc>`"
2791 section.
2792
2793 Setting this variable to "1" in your ``local.conf`` disables the
2794 function:
2795 ::
2796
2797 ICECC_DISABLED ??= "1"
2798
2799 To enable the function, set the variable as follows:
2800 ::
2801
2802 ICECC_DISABLED = ""
2803
Andrew Geisslerf0343792020-11-18 10:42:21 -06002804 :term:`ICECC_ENV_EXEC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002805 Points to the ``icecc-create-env`` script that you provide. This
2806 variable is used by the :ref:`icecc <ref-classes-icecc>` class. You
2807 set this variable in your ``local.conf`` file.
2808
2809 If you do not point to a script that you provide, the OpenEmbedded
2810 build system uses the default script provided by the
2811 ``icecc-create-env.bb`` recipe, which is a modified version and not
2812 the one that comes with ``icecc``.
2813
Andrew Geisslerf0343792020-11-18 10:42:21 -06002814 :term:`ICECC_PARALLEL_MAKE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002815 Extra options passed to the ``make`` command during the
2816 :ref:`ref-tasks-compile` task that specify parallel
2817 compilation. This variable usually takes the form of "-j x", where x
2818 represents the maximum number of parallel threads ``make`` can run.
2819
2820 .. note::
2821
2822 The options passed affect builds on all enabled machines on the
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002823 network, which are machines running the ``iceccd`` daemon.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002824
2825 If your enabled machines support multiple cores, coming up with the
2826 maximum number of parallel threads that gives you the best
2827 performance could take some experimentation since machine speed,
2828 network lag, available memory, and existing machine loads can all
2829 affect build time. Consequently, unlike the
2830 :term:`PARALLEL_MAKE` variable, there is no
2831 rule-of-thumb for setting ``ICECC_PARALLEL_MAKE`` to achieve optimal
2832 performance.
2833
2834 If you do not set ``ICECC_PARALLEL_MAKE``, the build system does not
2835 use it (i.e. the system does not detect and assign the number of
2836 cores as is done with ``PARALLEL_MAKE``).
2837
Andrew Geisslerf0343792020-11-18 10:42:21 -06002838 :term:`ICECC_PATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002839 The location of the ``icecc`` binary. You can set this variable in
2840 your ``local.conf`` file. If your ``local.conf`` file does not define
2841 this variable, the :ref:`icecc <ref-classes-icecc>` class attempts
2842 to define it by locating ``icecc`` using ``which``.
2843
Andrew Geisslerf0343792020-11-18 10:42:21 -06002844 :term:`ICECC_USER_CLASS_BL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002845 Identifies user classes that you do not want the Icecream distributed
2846 compile support to consider. This variable is used by the
2847 :ref:`icecc <ref-classes-icecc>` class. You set this variable in
2848 your ``local.conf`` file.
2849
2850 When you list classes using this variable, you are "blacklisting"
2851 them from distributed compilation across remote hosts. Any classes
2852 you list will be distributed and compiled locally.
2853
Andrew Geisslerf0343792020-11-18 10:42:21 -06002854 :term:`ICECC_USER_PACKAGE_BL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002855 Identifies user recipes that you do not want the Icecream distributed
2856 compile support to consider. This variable is used by the
2857 :ref:`icecc <ref-classes-icecc>` class. You set this variable in
2858 your ``local.conf`` file.
2859
2860 When you list packages using this variable, you are "blacklisting"
2861 them from distributed compilation across remote hosts. Any packages
2862 you list will be distributed and compiled locally.
2863
Andrew Geisslerf0343792020-11-18 10:42:21 -06002864 :term:`ICECC_USER_PACKAGE_WL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002865 Identifies user recipes that use an empty
2866 :term:`PARALLEL_MAKE` variable that you want to
2867 force remote distributed compilation on using the Icecream
2868 distributed compile support. This variable is used by the
2869 :ref:`icecc <ref-classes-icecc>` class. You set this variable in
2870 your ``local.conf`` file.
2871
Andrew Geisslerf0343792020-11-18 10:42:21 -06002872 :term:`IMAGE_BASENAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002873 The base name of image output files. This variable defaults to the
2874 recipe name (``${``\ :term:`PN`\ ``}``).
2875
Andrew Geisslerf0343792020-11-18 10:42:21 -06002876 :term:`IMAGE_EFI_BOOT_FILES`
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002877 A space-separated list of files installed into the boot partition
2878 when preparing an image using the Wic tool with the
2879 ``bootimg-efi`` source plugin. By default,
2880 the files are
2881 installed under the same name as the source files. To change the
2882 installed name, separate it from the original name with a semi-colon
2883 (;). Source files need to be located in
2884 :term:`DEPLOY_DIR_IMAGE`. Here are two
2885 examples:
2886 ::
2887
2888 IMAGE_EFI_BOOT_FILES = "${KERNEL_IMAGETYPE};bz2"
2889 IMAGE_EFI_BOOT_FILES = "${KERNEL_IMAGETYPE} microcode.cpio"
2890
2891 Alternatively, source files can be picked up using a glob pattern. In
2892 this case, the destination file must have the same name as the base
2893 name of the source file path. To install files into a directory
2894 within the target location, pass its name after a semi-colon (;).
2895 Here are two examples:
2896 ::
2897
2898 IMAGE_EFI_BOOT_FILES = "boot/loader/*"
2899 IMAGE_EFI_BOOT_FILES = "boot/loader/*;boot/"
2900
2901 The first example
2902 installs all files from ``${DEPLOY_DIR_IMAGE}/boot/loader/``
2903 into the root of the target partition. The second example installs
2904 the same files into a ``boot`` directory within the target partition.
2905
2906 You can find information on how to use the Wic tool in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002907 ":ref:`dev-manual/common-tasks:creating partitioned images using wic`"
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002908 section of the Yocto Project Development Tasks Manual. Reference
2909 material for Wic is located in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002910 ":doc:`/ref-manual/kickstart`" chapter.
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002911
Andrew Geisslerf0343792020-11-18 10:42:21 -06002912 :term:`IMAGE_BOOT_FILES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002913 A space-separated list of files installed into the boot partition
2914 when preparing an image using the Wic tool with the
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05002915 ``bootimg-partition`` source plugin. By default,
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002916 the files are
2917 installed under the same name as the source files. To change the
2918 installed name, separate it from the original name with a semi-colon
2919 (;). Source files need to be located in
2920 :term:`DEPLOY_DIR_IMAGE`. Here are two
2921 examples:
2922 ::
2923
2924 IMAGE_BOOT_FILES = "u-boot.img uImage;kernel"
2925 IMAGE_BOOT_FILES = "u-boot.${UBOOT_SUFFIX} ${KERNEL_IMAGETYPE}"
2926
2927 Alternatively, source files can be picked up using a glob pattern. In
2928 this case, the destination file must have the same name as the base
2929 name of the source file path. To install files into a directory
2930 within the target location, pass its name after a semi-colon (;).
2931 Here are two examples:
2932 ::
2933
2934 IMAGE_BOOT_FILES = "bcm2835-bootfiles/*"
2935 IMAGE_BOOT_FILES = "bcm2835-bootfiles/*;boot/"
2936
2937 The first example
2938 installs all files from ``${DEPLOY_DIR_IMAGE}/bcm2835-bootfiles``
2939 into the root of the target partition. The second example installs
2940 the same files into a ``boot`` directory within the target partition.
2941
2942 You can find information on how to use the Wic tool in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002943 ":ref:`dev-manual/common-tasks:creating partitioned images using wic`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002944 section of the Yocto Project Development Tasks Manual. Reference
2945 material for Wic is located in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06002946 ":doc:`/ref-manual/kickstart`" chapter.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002947
Andrew Geisslerf0343792020-11-18 10:42:21 -06002948 :term:`IMAGE_CLASSES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002949 A list of classes that all images should inherit. You typically use
2950 this variable to specify the list of classes that register the
2951 different types of images the OpenEmbedded build system creates.
2952
2953 The default value for ``IMAGE_CLASSES`` is ``image_types``. You can
2954 set this variable in your ``local.conf`` or in a distribution
2955 configuration file.
2956
2957 For more information, see ``meta/classes/image_types.bbclass`` in the
2958 :term:`Source Directory`.
2959
Andrew Geisslerf0343792020-11-18 10:42:21 -06002960 :term:`IMAGE_CMD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002961 Specifies the command to create the image file for a specific image
2962 type, which corresponds to the value set set in
2963 :term:`IMAGE_FSTYPES`, (e.g. ``ext3``,
2964 ``btrfs``, and so forth). When setting this variable, you should use
2965 an override for the associated type. Here is an example:
2966 ::
2967
2968 IMAGE_CMD_jffs2 = "mkfs.jffs2 --root=${IMAGE_ROOTFS} \
2969 --faketime --output=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.jffs2 \
2970 ${EXTRA_IMAGECMD}"
2971
2972 You typically do not need to set this variable unless you are adding
2973 support for a new image type. For more examples on how to set this
2974 variable, see the :ref:`image_types <ref-classes-image_types>`
2975 class file, which is ``meta/classes/image_types.bbclass``.
2976
Andrew Geisslerf0343792020-11-18 10:42:21 -06002977 :term:`IMAGE_DEVICE_TABLES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002978 Specifies one or more files that contain custom device tables that
2979 are passed to the ``makedevs`` command as part of creating an image.
2980 These files list basic device nodes that should be created under
2981 ``/dev`` within the image. If ``IMAGE_DEVICE_TABLES`` is not set,
2982 ``files/device_table-minimal.txt`` is used, which is located by
2983 :term:`BBPATH`. For details on how you should write
2984 device table files, see ``meta/files/device_table-minimal.txt`` as an
2985 example.
2986
Andrew Geisslerf0343792020-11-18 10:42:21 -06002987 :term:`IMAGE_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002988 The primary list of features to include in an image. Typically, you
2989 configure this variable in an image recipe. Although you can use this
2990 variable from your ``local.conf`` file, which is found in the
2991 :term:`Build Directory`, best practices dictate that you do
2992 not.
2993
2994 .. note::
2995
2996 To enable extra features from outside the image recipe, use the
Andrew Geissler4c19ea12020-10-27 13:52:24 -05002997 :term:`EXTRA_IMAGE_FEATURES` variable.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05002998
2999 For a list of image features that ships with the Yocto Project, see
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003000 the ":ref:`ref-features-image`" section.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003001
3002 For an example that shows how to customize your image by using this
Andrew Geissler09209ee2020-12-13 08:44:15 -06003003 variable, see the ":ref:`dev-manual/common-tasks:customizing images using custom \`\`image_features\`\` and \`\`extra_image_features\`\``"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003004 section in the Yocto Project Development Tasks Manual.
3005
Andrew Geisslerf0343792020-11-18 10:42:21 -06003006 :term:`IMAGE_FSTYPES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003007 Specifies the formats the OpenEmbedded build system uses during the
3008 build when creating the root filesystem. For example, setting
3009 ``IMAGE_FSTYPES`` as follows causes the build system to create root
3010 filesystems using two formats: ``.ext3`` and ``.tar.bz2``:
3011 ::
3012
3013 IMAGE_FSTYPES = "ext3 tar.bz2"
3014
3015 For the complete list of supported image formats from which you can
3016 choose, see :term:`IMAGE_TYPES`.
3017
3018 .. note::
3019
3020 - If an image recipe uses the "inherit image" line and you are
3021 setting ``IMAGE_FSTYPES`` inside the recipe, you must set
3022 ``IMAGE_FSTYPES`` prior to using the "inherit image" line.
3023
3024 - Due to the way the OpenEmbedded build system processes this
3025 variable, you cannot update its contents by using ``_append``
3026 or ``_prepend``. You must use the ``+=`` operator to add one or
3027 more options to the ``IMAGE_FSTYPES`` variable.
3028
Andrew Geisslerf0343792020-11-18 10:42:21 -06003029 :term:`IMAGE_INSTALL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003030 Used by recipes to specify the packages to install into an image
3031 through the :ref:`image <ref-classes-image>` class. Use the
3032 ``IMAGE_INSTALL`` variable with care to avoid ordering issues.
3033
3034 Image recipes set ``IMAGE_INSTALL`` to specify the packages to
3035 install into an image through ``image.bbclass``. Additionally,
3036 "helper" classes such as the
3037 :ref:`core-image <ref-classes-core-image>` class exist that can
3038 take lists used with ``IMAGE_FEATURES`` and turn them into
3039 auto-generated entries in ``IMAGE_INSTALL`` in addition to its
3040 default contents.
3041
3042 When you use this variable, it is best to use it as follows:
3043 ::
3044
3045 IMAGE_INSTALL_append = " package-name"
3046
3047 Be sure to include the space
3048 between the quotation character and the start of the package name or
3049 names.
3050
3051 .. note::
3052
3053 - When working with a
Andrew Geissler09209ee2020-12-13 08:44:15 -06003054 :ref:`core-image-minimal-initramfs <ref-manual/images:images>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003055 image, do not use the ``IMAGE_INSTALL`` variable to specify
3056 packages for installation. Instead, use the
3057 :term:`PACKAGE_INSTALL` variable, which
3058 allows the initial RAM filesystem (initramfs) recipe to use a
3059 fixed set of packages and not be affected by ``IMAGE_INSTALL``.
3060 For information on creating an initramfs, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06003061 ":ref:`dev-manual/common-tasks:building an initial ram filesystem (initramfs) image`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003062 section in the Yocto Project Development Tasks Manual.
3063
3064 - Using ``IMAGE_INSTALL`` with the
Andrew Geissler09209ee2020-12-13 08:44:15 -06003065 :ref:`+= <bitbake:bitbake-user-manual/bitbake-user-manual-metadata:appending (+=) and prepending (=+) with spaces>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003066 BitBake operator within the ``/conf/local.conf`` file or from
3067 within an image recipe is not recommended. Use of this operator
3068 in these ways can cause ordering issues. Since
3069 ``core-image.bbclass`` sets ``IMAGE_INSTALL`` to a default
3070 value using the
3071 :ref:`?= <bitbake:bitbake-user-manual/bitbake-user-manual-metadata:setting a default value (?=)>`
3072 operator, using a ``+=`` operation against ``IMAGE_INSTALL``
3073 results in unexpected behavior when used within
3074 ``conf/local.conf``. Furthermore, the same operation from
3075 within an image recipe may or may not succeed depending on the
3076 specific situation. In both these cases, the behavior is
3077 contrary to how most users expect the ``+=`` operator to work.
3078
Andrew Geisslerf0343792020-11-18 10:42:21 -06003079 :term:`IMAGE_LINGUAS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003080 Specifies the list of locales to install into the image during the
3081 root filesystem construction process. The OpenEmbedded build system
3082 automatically splits locale files, which are used for localization,
3083 into separate packages. Setting the ``IMAGE_LINGUAS`` variable
3084 ensures that any locale packages that correspond to packages already
3085 selected for installation into the image are also installed. Here is
3086 an example:
3087 ::
3088
3089 IMAGE_LINGUAS = "pt-br de-de"
3090
3091 In this example, the build system ensures any Brazilian Portuguese
3092 and German locale files that correspond to packages in the image are
3093 installed (i.e. ``*-locale-pt-br`` and ``*-locale-de-de`` as well as
3094 ``*-locale-pt`` and ``*-locale-de``, since some software packages
3095 only provide locale files by language and not by country-specific
3096 language).
3097
3098 See the :term:`GLIBC_GENERATE_LOCALES`
3099 variable for information on generating GLIBC locales.
3100
Andrew Geissler6ce62a22020-11-30 19:58:47 -06003101
3102 :term:`IMAGE_LINK_NAME`
3103 The name of the output image symlink (which does not include
3104 the version part as :term:`IMAGE_NAME` does). The default value
3105 is derived using the :term:`IMAGE_BASENAME` and :term:`MACHINE`
3106 variables:
3107 ::
3108
3109 IMAGE_LINK_NAME ?= "${IMAGE_BASENAME}-${MACHINE}"
3110
3111
Andrew Geisslerf0343792020-11-18 10:42:21 -06003112 :term:`IMAGE_MANIFEST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003113 The manifest file for the image. This file lists all the installed
3114 packages that make up the image. The file contains package
3115 information on a line-per-package basis as follows:
3116 ::
3117
3118 packagename packagearch version
3119
3120 The :ref:`image <ref-classes-image>` class defines the manifest
3121 file as follows:
3122 ::
3123
3124 IMAGE_MANIFEST ="${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.manifest"
3125
3126 The location is
3127 derived using the :term:`DEPLOY_DIR_IMAGE`
3128 and :term:`IMAGE_NAME` variables. You can find
Andrew Geissler09209ee2020-12-13 08:44:15 -06003129 information on how the image is created in the ":ref:`overview-manual/concepts:image generation`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003130 section in the Yocto Project Overview and Concepts Manual.
3131
Andrew Geisslerf0343792020-11-18 10:42:21 -06003132 :term:`IMAGE_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003133 The name of the output image files minus the extension. This variable
3134 is derived using the :term:`IMAGE_BASENAME`,
Andrew Geissler6ce62a22020-11-30 19:58:47 -06003135 :term:`MACHINE`, and :term:`IMAGE_VERSION_SUFFIX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003136 variables:
3137 ::
3138
Andrew Geissler6ce62a22020-11-30 19:58:47 -06003139 IMAGE_NAME ?= "${IMAGE_BASENAME}-${MACHINE}${IMAGE_VERSION_SUFFIX}"
3140
3141 :term:`IMAGE_NAME_SUFFIX`
3142 Suffix used for the image output file name - defaults to ``".rootfs"``
3143 to distinguish the image file from other files created during image
3144 building; however if this suffix is redundant or not desired you can
3145 clear the value of this variable (set the value to ""). For example,
3146 this is typically cleared in initramfs image recipes.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003147
Andrew Geisslerf0343792020-11-18 10:42:21 -06003148 :term:`IMAGE_OVERHEAD_FACTOR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003149 Defines a multiplier that the build system applies to the initial
3150 image size for cases when the multiplier times the returned disk
3151 usage value for the image is greater than the sum of
3152 ``IMAGE_ROOTFS_SIZE`` and ``IMAGE_ROOTFS_EXTRA_SPACE``. The result of
3153 the multiplier applied to the initial image size creates free disk
3154 space in the image as overhead. By default, the build process uses a
3155 multiplier of 1.3 for this variable. This default value results in
3156 30% free disk space added to the image when this method is used to
3157 determine the final generated image size. You should be aware that
3158 post install scripts and the package management system uses disk
3159 space inside this overhead area. Consequently, the multiplier does
3160 not produce an image with all the theoretical free disk space. See
3161 ``IMAGE_ROOTFS_SIZE`` for information on how the build system
3162 determines the overall image size.
3163
3164 The default 30% free disk space typically gives the image enough room
3165 to boot and allows for basic post installs while still leaving a
3166 small amount of free disk space. If 30% free space is inadequate, you
3167 can increase the default value. For example, the following setting
3168 gives you 50% free space added to the image:
3169 ::
3170
3171 IMAGE_OVERHEAD_FACTOR = "1.5"
3172
3173 Alternatively, you can ensure a specific amount of free disk space is
3174 added to the image by using the ``IMAGE_ROOTFS_EXTRA_SPACE``
3175 variable.
3176
Andrew Geisslerf0343792020-11-18 10:42:21 -06003177 :term:`IMAGE_PKGTYPE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003178 Defines the package type (i.e. DEB, RPM, IPK, or TAR) used by the
3179 OpenEmbedded build system. The variable is defined appropriately by
3180 the :ref:`package_deb <ref-classes-package_deb>`,
3181 :ref:`package_rpm <ref-classes-package_rpm>`,
3182 :ref:`package_ipk <ref-classes-package_ipk>`, or
3183 :ref:`package_tar <ref-classes-package_tar>` class.
3184
3185 .. note::
3186
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003187 The ``package_tar`` class is broken and is not supported. It is
3188 recommended that you do not use it.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003189
3190 The :ref:`populate_sdk_* <ref-classes-populate-sdk-*>` and
3191 :ref:`image <ref-classes-image>` classes use the ``IMAGE_PKGTYPE``
3192 for packaging up images and SDKs.
3193
3194 You should not set the ``IMAGE_PKGTYPE`` manually. Rather, the
3195 variable is set indirectly through the appropriate
3196 :ref:`package_* <ref-classes-package>` class using the
3197 :term:`PACKAGE_CLASSES` variable. The
3198 OpenEmbedded build system uses the first package type (e.g. DEB, RPM,
3199 or IPK) that appears with the variable
3200
3201 .. note::
3202
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003203 Files using the ``.tar`` format are never used as a substitute
3204 packaging format for DEB, RPM, and IPK formatted files for your image
3205 or SDK.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003206
Andrew Geisslerf0343792020-11-18 10:42:21 -06003207 :term:`IMAGE_POSTPROCESS_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003208 Specifies a list of functions to call once the OpenEmbedded build
3209 system creates the final image output files. You can specify
3210 functions separated by semicolons:
3211 ::
3212
3213 IMAGE_POSTPROCESS_COMMAND += "function; ... "
3214
3215 If you need to pass the root filesystem path to a command within the
3216 function, you can use ``${IMAGE_ROOTFS}``, which points to the
3217 directory that becomes the root filesystem image. See the
3218 :term:`IMAGE_ROOTFS` variable for more
3219 information.
3220
Andrew Geisslerf0343792020-11-18 10:42:21 -06003221 :term:`IMAGE_PREPROCESS_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003222 Specifies a list of functions to call before the OpenEmbedded build
3223 system creates the final image output files. You can specify
3224 functions separated by semicolons:
3225 ::
3226
3227 IMAGE_PREPROCESS_COMMAND += "function; ... "
3228
3229 If you need to pass the root filesystem path to a command within the
3230 function, you can use ``${IMAGE_ROOTFS}``, which points to the
3231 directory that becomes the root filesystem image. See the
3232 :term:`IMAGE_ROOTFS` variable for more
3233 information.
3234
Andrew Geisslerf0343792020-11-18 10:42:21 -06003235 :term:`IMAGE_ROOTFS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003236 The location of the root filesystem while it is under construction
3237 (i.e. during the :ref:`ref-tasks-rootfs` task). This
3238 variable is not configurable. Do not change it.
3239
Andrew Geisslerf0343792020-11-18 10:42:21 -06003240 :term:`IMAGE_ROOTFS_ALIGNMENT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003241 Specifies the alignment for the output image file in Kbytes. If the
3242 size of the image is not a multiple of this value, then the size is
3243 rounded up to the nearest multiple of the value. The default value is
3244 "1". See :term:`IMAGE_ROOTFS_SIZE` for
3245 additional information.
3246
Andrew Geisslerf0343792020-11-18 10:42:21 -06003247 :term:`IMAGE_ROOTFS_EXTRA_SPACE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003248 Defines additional free disk space created in the image in Kbytes. By
3249 default, this variable is set to "0". This free disk space is added
3250 to the image after the build system determines the image size as
3251 described in ``IMAGE_ROOTFS_SIZE``.
3252
3253 This variable is particularly useful when you want to ensure that a
3254 specific amount of free disk space is available on a device after an
3255 image is installed and running. For example, to be sure 5 Gbytes of
3256 free disk space is available, set the variable as follows:
3257 ::
3258
3259 IMAGE_ROOTFS_EXTRA_SPACE = "5242880"
3260
3261 For example, the Yocto Project Build Appliance specifically requests
3262 40 Gbytes of extra space with the line:
3263 ::
3264
3265 IMAGE_ROOTFS_EXTRA_SPACE = "41943040"
3266
Andrew Geisslerf0343792020-11-18 10:42:21 -06003267 :term:`IMAGE_ROOTFS_SIZE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003268 Defines the size in Kbytes for the generated image. The OpenEmbedded
3269 build system determines the final size for the generated image using
3270 an algorithm that takes into account the initial disk space used for
3271 the generated image, a requested size for the image, and requested
3272 additional free disk space to be added to the image. Programatically,
3273 the build system determines the final size of the generated image as
3274 follows:
3275 ::
3276
3277 if (image-du * overhead) < rootfs-size:
3278 internal-rootfs-size = rootfs-size + xspace
3279 else:
3280 internal-rootfs-size = (image-du * overhead) + xspace
3281 where:
3282 image-du = Returned value of the du command on the image.
3283 overhead = IMAGE_OVERHEAD_FACTOR
3284 rootfs-size = IMAGE_ROOTFS_SIZE
3285 internal-rootfs-size = Initial root filesystem size before any modifications.
3286 xspace = IMAGE_ROOTFS_EXTRA_SPACE
3287
3288 See the :term:`IMAGE_OVERHEAD_FACTOR`
3289 and :term:`IMAGE_ROOTFS_EXTRA_SPACE`
3290 variables for related information.
3291
Andrew Geisslerf0343792020-11-18 10:42:21 -06003292 :term:`IMAGE_TYPEDEP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003293 Specifies a dependency from one image type on another. Here is an
3294 example from the :ref:`image-live <ref-classes-image-live>` class:
3295 ::
3296
3297 IMAGE_TYPEDEP_live = "ext3"
3298
3299 In the previous example, the variable ensures that when "live" is
3300 listed with the :term:`IMAGE_FSTYPES` variable,
3301 the OpenEmbedded build system produces an ``ext3`` image first since
3302 one of the components of the live image is an ``ext3`` formatted
3303 partition containing the root filesystem.
3304
Andrew Geisslerf0343792020-11-18 10:42:21 -06003305 :term:`IMAGE_TYPES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003306 Specifies the complete list of supported image types by default:
3307
3308 - btrfs
3309 - container
3310 - cpio
3311 - cpio.gz
3312 - cpio.lz4
3313 - cpio.lzma
3314 - cpio.xz
3315 - cramfs
3316 - ext2
3317 - ext2.bz2
3318 - ext2.gz
3319 - ext2.lzma
3320 - ext3
3321 - ext3.gz
3322 - ext4
3323 - ext4.gz
3324 - f2fs
3325 - hddimg
3326 - iso
3327 - jffs2
3328 - jffs2.sum
3329 - multiubi
3330 - squashfs
3331 - squashfs-lz4
3332 - squashfs-lzo
3333 - squashfs-xz
3334 - tar
3335 - tar.bz2
3336 - tar.gz
3337 - tar.lz4
3338 - tar.xz
3339 - tar.zst
3340 - ubi
3341 - ubifs
3342 - wic
3343 - wic.bz2
3344 - wic.gz
3345 - wic.lzma
3346
3347 For more information about these types of images, see
3348 ``meta/classes/image_types*.bbclass`` in the :term:`Source Directory`.
3349
Andrew Geissler6ce62a22020-11-30 19:58:47 -06003350 :term:`IMAGE_VERSION_SUFFIX`
3351 Version suffix that is part of the default :term:`IMAGE_NAME` and
3352 :term:`KERNEL_ARTIFACT_NAME` values.
3353 Defaults to ``"-${DATETIME}"``, however you could set this to a
3354 version string that comes from your external build environment if
3355 desired, and this suffix would then be used consistently across
3356 the build artifacts.
3357
Andrew Geisslerf0343792020-11-18 10:42:21 -06003358 :term:`INC_PR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003359 Helps define the recipe revision for recipes that share a common
3360 ``include`` file. You can think of this variable as part of the
3361 recipe revision as set from within an include file.
3362
3363 Suppose, for example, you have a set of recipes that are used across
3364 several projects. And, within each of those recipes the revision (its
3365 :term:`PR` value) is set accordingly. In this case, when
3366 the revision of those recipes changes, the burden is on you to find
3367 all those recipes and be sure that they get changed to reflect the
3368 updated version of the recipe. In this scenario, it can get
3369 complicated when recipes that are used in many places and provide
3370 common functionality are upgraded to a new revision.
3371
3372 A more efficient way of dealing with this situation is to set the
3373 ``INC_PR`` variable inside the ``include`` files that the recipes
3374 share and then expand the ``INC_PR`` variable within the recipes to
3375 help define the recipe revision.
3376
3377 The following provides an example that shows how to use the
3378 ``INC_PR`` variable given a common ``include`` file that defines the
3379 variable. Once the variable is defined in the ``include`` file, you
3380 can use the variable to set the ``PR`` values in each recipe. You
3381 will notice that when you set a recipe's ``PR`` you can provide more
3382 granular revisioning by appending values to the ``INC_PR`` variable:
3383 ::
3384
3385 recipes-graphics/xorg-font/xorg-font-common.inc:INC_PR = "r2"
3386 recipes-graphics/xorg-font/encodings_1.0.4.bb:PR = "${INC_PR}.1"
3387 recipes-graphics/xorg-font/font-util_1.3.0.bb:PR = "${INC_PR}.0"
3388 recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
3389
3390 The
3391 first line of the example establishes the baseline revision to be
3392 used for all recipes that use the ``include`` file. The remaining
3393 lines in the example are from individual recipes and show how the
3394 ``PR`` value is set.
3395
Andrew Geisslerf0343792020-11-18 10:42:21 -06003396 :term:`INCOMPATIBLE_LICENSE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003397 Specifies a space-separated list of license names (as they would
3398 appear in :term:`LICENSE`) that should be excluded
3399 from the build. Recipes that provide no alternatives to listed
3400 incompatible licenses are not built. Packages that are individually
3401 licensed with the specified incompatible licenses will be deleted.
3402
3403 .. note::
3404
3405 This functionality is only regularly tested using the following
3406 setting:
3407 ::
3408
3409 INCOMPATIBLE_LICENSE = "GPL-3.0 LGPL-3.0 AGPL-3.0"
3410
3411
3412 Although you can use other settings, you might be required to
3413 remove dependencies on or provide alternatives to components that
3414 are required to produce a functional system image.
3415
3416 .. note::
3417
3418 It is possible to define a list of licenses that are allowed to be
3419 used instead of the licenses that are excluded. To do this, define
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003420 a variable ``COMPATIBLE_LICENSES`` with the names of the licences
3421 that are allowed. Then define ``INCOMPATIBLE_LICENSE`` as:
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003422 ::
3423
3424 INCOMPATIBLE_LICENSE = "${@' '.join(sorted(set(d.getVar('AVAILABLE_LICENSES').split()) - set(d.getVar('COMPATIBLE_LICENSES').split())))}"
3425
3426
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003427 This will result in ``INCOMPATIBLE_LICENSE`` containing the names of
3428 all licences from :term:`AVAILABLE_LICENSES` except the ones specified
3429 in ``COMPATIBLE_LICENSES`` , thus only allowing the latter licences to
3430 be used.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003431
Andrew Geisslerf0343792020-11-18 10:42:21 -06003432 :term:`INHERIT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003433 Causes the named class or classes to be inherited globally. Anonymous
3434 functions in the class or classes are not executed for the base
3435 configuration and in each individual recipe. The OpenEmbedded build
3436 system ignores changes to ``INHERIT`` in individual recipes.
3437
3438 For more information on ``INHERIT``, see the
3439 :ref:`bitbake:bitbake-user-manual/bitbake-user-manual-metadata:\`\`inherit\`\` configuration directive`"
3440 section in the Bitbake User Manual.
3441
Andrew Geisslerf0343792020-11-18 10:42:21 -06003442 :term:`INHERIT_DISTRO`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003443 Lists classes that will be inherited at the distribution level. It is
3444 unlikely that you want to edit this variable.
3445
3446 The default value of the variable is set as follows in the
3447 ``meta/conf/distro/defaultsetup.conf`` file:
3448 ::
3449
3450 INHERIT_DISTRO ?= "debian devshell sstate license"
3451
Andrew Geisslerf0343792020-11-18 10:42:21 -06003452 :term:`INHIBIT_DEFAULT_DEPS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003453 Prevents the default dependencies, namely the C compiler and standard
3454 C library (libc), from being added to :term:`DEPENDS`.
3455 This variable is usually used within recipes that do not require any
3456 compilation using the C compiler.
3457
3458 Set the variable to "1" to prevent the default dependencies from
3459 being added.
3460
Andrew Geisslerf0343792020-11-18 10:42:21 -06003461 :term:`INHIBIT_PACKAGE_DEBUG_SPLIT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003462 Prevents the OpenEmbedded build system from splitting out debug
3463 information during packaging. By default, the build system splits out
3464 debugging information during the
3465 :ref:`ref-tasks-package` task. For more information on
3466 how debug information is split out, see the
3467 :term:`PACKAGE_DEBUG_SPLIT_STYLE`
3468 variable.
3469
3470 To prevent the build system from splitting out debug information
3471 during packaging, set the ``INHIBIT_PACKAGE_DEBUG_SPLIT`` variable as
3472 follows:
3473 ::
3474
3475 INHIBIT_PACKAGE_DEBUG_SPLIT = "1"
3476
Andrew Geisslerf0343792020-11-18 10:42:21 -06003477 :term:`INHIBIT_PACKAGE_STRIP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003478 If set to "1", causes the build to not strip binaries in resulting
3479 packages and prevents the ``-dbg`` package from containing the source
3480 files.
3481
3482 By default, the OpenEmbedded build system strips binaries and puts
3483 the debugging symbols into ``${``\ :term:`PN`\ ``}-dbg``.
3484 Consequently, you should not set ``INHIBIT_PACKAGE_STRIP`` when you
3485 plan to debug in general.
3486
Andrew Geisslerf0343792020-11-18 10:42:21 -06003487 :term:`INHIBIT_SYSROOT_STRIP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003488 If set to "1", causes the build to not strip binaries in the
3489 resulting sysroot.
3490
3491 By default, the OpenEmbedded build system strips binaries in the
3492 resulting sysroot. When you specifically set the
3493 ``INHIBIT_SYSROOT_STRIP`` variable to "1" in your recipe, you inhibit
3494 this stripping.
3495
3496 If you want to use this variable, include the
3497 :ref:`staging <ref-classes-staging>` class. This class uses a
3498 ``sys_strip()`` function to test for the variable and acts
3499 accordingly.
3500
3501 .. note::
3502
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003503 Use of the ``INHIBIT_SYSROOT_STRIP`` variable occurs in rare and
3504 special circumstances. For example, suppose you are building
3505 bare-metal firmware by using an external GCC toolchain. Furthermore,
3506 even if the toolchain's binaries are strippable, other files exist
3507 that are needed for the build that are not strippable.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003508
Andrew Geisslerf0343792020-11-18 10:42:21 -06003509 :term:`INITRAMFS_FSTYPES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003510 Defines the format for the output image of an initial RAM filesystem
3511 (initramfs), which is used during boot. Supported formats are the
3512 same as those supported by the
3513 :term:`IMAGE_FSTYPES` variable.
3514
3515 The default value of this variable, which is set in the
3516 ``meta/conf/bitbake.conf`` configuration file in the
3517 :term:`Source Directory`, is "cpio.gz". The Linux kernel's
3518 initramfs mechanism, as opposed to the initial RAM filesystem
3519 `initrd <https://en.wikipedia.org/wiki/Initrd>`__ mechanism, expects
3520 an optionally compressed cpio archive.
3521
Andrew Geisslerf0343792020-11-18 10:42:21 -06003522 :term:`INITRAMFS_IMAGE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003523 Specifies the :term:`PROVIDES` name of an image
3524 recipe that is used to build an initial RAM filesystem (initramfs)
3525 image. In other words, the ``INITRAMFS_IMAGE`` variable causes an
3526 additional recipe to be built as a dependency to whatever root
3527 filesystem recipe you might be using (e.g. ``core-image-sato``). The
3528 initramfs image recipe you provide should set
3529 :term:`IMAGE_FSTYPES` to
3530 :term:`INITRAMFS_FSTYPES`.
3531
3532 An initramfs image provides a temporary root filesystem used for
3533 early system initialization (e.g. loading of modules needed to locate
3534 and mount the "real" root filesystem).
3535
3536 .. note::
3537
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003538 See the ``meta/recipes-core/images/core-image-minimal-initramfs.bb``
3539 recipe in the :term:`Source Directory`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003540 for an example initramfs recipe. To select this sample recipe as
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003541 the one built to provide the initramfs image, set ``INITRAMFS_IMAGE``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003542 to "core-image-minimal-initramfs".
3543
3544 You can also find more information by referencing the
3545 ``meta-poky/conf/local.conf.sample.extended`` configuration file in
3546 the Source Directory, the :ref:`image <ref-classes-image>` class,
3547 and the :ref:`kernel <ref-classes-kernel>` class to see how to use
3548 the ``INITRAMFS_IMAGE`` variable.
3549
3550 If ``INITRAMFS_IMAGE`` is empty, which is the default, then no
3551 initramfs image is built.
3552
3553 For more information, you can also see the
3554 :term:`INITRAMFS_IMAGE_BUNDLE`
3555 variable, which allows the generated image to be bundled inside the
3556 kernel image. Additionally, for information on creating an initramfs
Andrew Geissler09209ee2020-12-13 08:44:15 -06003557 image, see the ":ref:`dev-manual/common-tasks:building an initial ram filesystem (initramfs) image`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003558 in the Yocto Project Development Tasks Manual.
3559
Andrew Geisslerf0343792020-11-18 10:42:21 -06003560 :term:`INITRAMFS_IMAGE_BUNDLE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003561 Controls whether or not the image recipe specified by
3562 :term:`INITRAMFS_IMAGE` is run through an
3563 extra pass
3564 (:ref:`ref-tasks-bundle_initramfs`) during
3565 kernel compilation in order to build a single binary that contains
3566 both the kernel image and the initial RAM filesystem (initramfs)
3567 image. This makes use of the
3568 :term:`CONFIG_INITRAMFS_SOURCE` kernel
3569 feature.
3570
3571 .. note::
3572
3573 Using an extra compilation pass to bundle the initramfs avoids a
3574 circular dependency between the kernel recipe and the initramfs
3575 recipe should the initramfs include kernel modules. Should that be
3576 the case, the initramfs recipe depends on the kernel for the
3577 kernel modules, and the kernel depends on the initramfs recipe
3578 since the initramfs is bundled inside the kernel image.
3579
3580 The combined binary is deposited into the ``tmp/deploy`` directory,
3581 which is part of the :term:`Build Directory`.
3582
3583 Setting the variable to "1" in a configuration file causes the
3584 OpenEmbedded build system to generate a kernel image with the
3585 initramfs specified in ``INITRAMFS_IMAGE`` bundled within:
3586 ::
3587
3588 INITRAMFS_IMAGE_BUNDLE = "1"
3589
3590 By default, the
3591 :ref:`kernel <ref-classes-kernel>` class sets this variable to a
3592 null string as follows:
3593 ::
3594
3595 INITRAMFS_IMAGE_BUNDLE ?= ""
3596
3597 .. note::
3598
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003599 You must set the ``INITRAMFS_IMAGE_BUNDLE`` variable in a
3600 configuration file. You cannot set the variable in a recipe file.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003601
3602 See the
Andrew Geissler09209ee2020-12-13 08:44:15 -06003603 :yocto_git:`local.conf.sample.extended </poky/tree/meta-poky/conf/local.conf.sample.extended>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003604 file for additional information. Also, for information on creating an
Andrew Geissler09209ee2020-12-13 08:44:15 -06003605 initramfs, see the ":ref:`dev-manual/common-tasks:building an initial ram filesystem (initramfs) image`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003606 in the Yocto Project Development Tasks Manual.
3607
Andrew Geisslerf0343792020-11-18 10:42:21 -06003608 :term:`INITRAMFS_LINK_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003609 The link name of the initial RAM filesystem image. This variable is
3610 set in the ``meta/classes/kernel-artifact-names.bbclass`` file as
3611 follows:
3612 ::
3613
3614 INITRAMFS_LINK_NAME ?= "initramfs-${KERNEL_ARTIFACT_LINK_NAME}"
3615
3616 The value of the
3617 ``KERNEL_ARTIFACT_LINK_NAME`` variable, which is set in the same
3618 file, has the following value:
3619 ::
3620
3621 KERNEL_ARTIFACT_LINK_NAME ?= "${MACHINE}"
3622
3623 See the :term:`MACHINE` variable for additional
3624 information.
3625
Andrew Geisslerf0343792020-11-18 10:42:21 -06003626 :term:`INITRAMFS_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003627 The base name of the initial RAM filesystem image. This variable is
3628 set in the ``meta/classes/kernel-artifact-names.bbclass`` file as
3629 follows:
3630 ::
3631
3632 INITRAMFS_NAME ?= "initramfs-${KERNEL_ARTIFACT_NAME}"
3633
3634 The value of the :term:`KERNEL_ARTIFACT_NAME`
3635 variable, which is set in the same file, has the following value:
3636 ::
3637
3638 KERNEL_ARTIFACT_NAME ?= "${PKGE}-${PKGV}-${PKGR}-${MACHINE}${IMAGE_VERSION_SUFFIX}"
3639
Andrew Geisslerf0343792020-11-18 10:42:21 -06003640 :term:`INITRD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003641 Indicates list of filesystem images to concatenate and use as an
3642 initial RAM disk (``initrd``).
3643
3644 The ``INITRD`` variable is an optional variable used with the
3645 :ref:`image-live <ref-classes-image-live>` class.
3646
Andrew Geisslerf0343792020-11-18 10:42:21 -06003647 :term:`INITRD_IMAGE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003648 When building a "live" bootable image (i.e. when
3649 :term:`IMAGE_FSTYPES` contains "live"),
3650 ``INITRD_IMAGE`` specifies the image recipe that should be built to
3651 provide the initial RAM disk image. The default value is
3652 "core-image-minimal-initramfs".
3653
3654 See the :ref:`image-live <ref-classes-image-live>` class for more
3655 information.
3656
Andrew Geisslerf0343792020-11-18 10:42:21 -06003657 :term:`INITSCRIPT_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003658 The filename of the initialization script as installed to
3659 ``${sysconfdir}/init.d``.
3660
3661 This variable is used in recipes when using ``update-rc.d.bbclass``.
3662 The variable is mandatory.
3663
Andrew Geisslerf0343792020-11-18 10:42:21 -06003664 :term:`INITSCRIPT_PACKAGES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003665 A list of the packages that contain initscripts. If multiple packages
3666 are specified, you need to append the package name to the other
3667 ``INITSCRIPT_*`` as an override.
3668
3669 This variable is used in recipes when using ``update-rc.d.bbclass``.
3670 The variable is optional and defaults to the :term:`PN`
3671 variable.
3672
Andrew Geisslerf0343792020-11-18 10:42:21 -06003673 :term:`INITSCRIPT_PARAMS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003674 Specifies the options to pass to ``update-rc.d``. Here is an example:
3675 ::
3676
3677 INITSCRIPT_PARAMS = "start 99 5 2 . stop 20 0 1 6 ."
3678
3679 In this example, the script has a runlevel of 99, starts the script
3680 in initlevels 2 and 5, and stops the script in levels 0, 1 and 6.
3681
3682 The variable's default value is "defaults", which is set in the
3683 :ref:`update-rc.d <ref-classes-update-rc.d>` class.
3684
3685 The value in ``INITSCRIPT_PARAMS`` is passed through to the
3686 ``update-rc.d`` command. For more information on valid parameters,
3687 please see the ``update-rc.d`` manual page at
Andrew Geisslerc3d88e42020-10-02 09:45:00 -05003688 https://manpages.debian.org/buster/init-system-helpers/update-rc.d.8.en.html
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003689
Andrew Geisslerf0343792020-11-18 10:42:21 -06003690 :term:`INSANE_SKIP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003691 Specifies the QA checks to skip for a specific package within a
3692 recipe. For example, to skip the check for symbolic link ``.so``
3693 files in the main package of a recipe, add the following to the
3694 recipe. The package name override must be used, which in this example
3695 is ``${PN}``:
3696 ::
3697
3698 INSANE_SKIP_${PN} += "dev-so"
3699
3700 See the ":ref:`insane.bbclass <ref-classes-insane>`" section for a
3701 list of the valid QA checks you can specify using this variable.
3702
Andrew Geisslerf0343792020-11-18 10:42:21 -06003703 :term:`INSTALL_TIMEZONE_FILE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003704 By default, the ``tzdata`` recipe packages an ``/etc/timezone`` file.
3705 Set the ``INSTALL_TIMEZONE_FILE`` variable to "0" at the
3706 configuration level to disable this behavior.
3707
Andrew Geisslerf0343792020-11-18 10:42:21 -06003708 :term:`IPK_FEED_URIS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003709 When the IPK backend is in use and package management is enabled on
3710 the target, you can use this variable to set up ``opkg`` in the
3711 target image to point to package feeds on a nominated server. Once
3712 the feed is established, you can perform installations or upgrades
3713 using the package manager at runtime.
3714
Andrew Geisslerf0343792020-11-18 10:42:21 -06003715 :term:`KARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003716 Defines the kernel architecture used when assembling the
3717 configuration. Architectures supported for this release are:
3718
3719 - powerpc
3720 - i386
3721 - x86_64
3722 - arm
3723 - qemu
3724 - mips
3725
Andrew Geissler09209ee2020-12-13 08:44:15 -06003726 You define the ``KARCH`` variable in the :ref:`kernel-dev/advanced:bsp descriptions`.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003727
Andrew Geisslerf0343792020-11-18 10:42:21 -06003728 :term:`KBRANCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003729 A regular expression used by the build process to explicitly identify
3730 the kernel branch that is validated, patched, and configured during a
3731 build. You must set this variable to ensure the exact kernel branch
3732 you want is being used by the build process.
3733
3734 Values for this variable are set in the kernel's recipe file and the
3735 kernel's append file. For example, if you are using the
3736 ``linux-yocto_4.12`` kernel, the kernel recipe file is the
3737 ``meta/recipes-kernel/linux/linux-yocto_4.12.bb`` file. ``KBRANCH``
3738 is set as follows in that kernel recipe file:
3739 ::
3740
3741 KBRANCH ?= "standard/base"
3742
3743 This variable is also used from the kernel's append file to identify
3744 the kernel branch specific to a particular machine or target
3745 hardware. Continuing with the previous kernel example, the kernel's
3746 append file (i.e. ``linux-yocto_4.12.bbappend``) is located in the
3747 BSP layer for a given machine. For example, the append file for the
3748 Beaglebone, EdgeRouter, and generic versions of both 32 and 64-bit IA
3749 machines (``meta-yocto-bsp``) is named
3750 ``meta-yocto-bsp/recipes-kernel/linux/linux-yocto_4.12.bbappend``.
3751 Here are the related statements from that append file:
3752 ::
3753
3754 KBRANCH_genericx86 = "standard/base"
3755 KBRANCH_genericx86-64 = "standard/base"
3756 KBRANCH_edgerouter = "standard/edgerouter"
3757 KBRANCH_beaglebone = "standard/beaglebone"
3758
3759 The ``KBRANCH`` statements
3760 identify the kernel branch to use when building for each supported
3761 BSP.
3762
Andrew Geisslerf0343792020-11-18 10:42:21 -06003763 :term:`KBUILD_DEFCONFIG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003764 When used with the :ref:`kernel-yocto <ref-classes-kernel-yocto>`
3765 class, specifies an "in-tree" kernel configuration file for use
3766 during a kernel build.
3767
3768 Typically, when using a ``defconfig`` to configure a kernel during a
3769 build, you place the file in your layer in the same manner as you
3770 would place patch files and configuration fragment files (i.e.
3771 "out-of-tree"). However, if you want to use a ``defconfig`` file that
3772 is part of the kernel tree (i.e. "in-tree"), you can use the
3773 ``KBUILD_DEFCONFIG`` variable and append the
3774 :term:`KMACHINE` variable to point to the
3775 ``defconfig`` file.
3776
3777 To use the variable, set it in the append file for your kernel recipe
3778 using the following form:
3779 ::
3780
3781 KBUILD_DEFCONFIG_KMACHINE ?= defconfig_file
3782
3783 Here is an example from a "raspberrypi2" ``KMACHINE`` build that uses
3784 a ``defconfig`` file named "bcm2709_defconfig":
3785 ::
3786
3787 KBUILD_DEFCONFIG_raspberrypi2 = "bcm2709_defconfig"
3788
3789 As an alternative, you can use the following within your append file:
3790 ::
3791
3792 KBUILD_DEFCONFIG_pn-linux-yocto ?= defconfig_file
3793
3794 For more
3795 information on how to use the ``KBUILD_DEFCONFIG`` variable, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06003796 ":ref:`kernel-dev/common:using an "in-tree" \`\`defconfig\`\` file`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003797 section in the Yocto Project Linux Kernel Development Manual.
3798
Andrew Geisslerf0343792020-11-18 10:42:21 -06003799 :term:`KERNEL_ALT_IMAGETYPE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003800 Specifies an alternate kernel image type for creation in addition to
3801 the kernel image type specified using the
3802 :term:`KERNEL_IMAGETYPE` variable.
3803
Andrew Geisslerf0343792020-11-18 10:42:21 -06003804 :term:`KERNEL_ARTIFACT_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003805 Specifies the name of all of the build artifacts. You can change the
3806 name of the artifacts by changing the ``KERNEL_ARTIFACT_NAME``
3807 variable.
3808
3809 The value of ``KERNEL_ARTIFACT_NAME``, which is set in the
3810 ``meta/classes/kernel-artifact-names.bbclass`` file, has the
3811 following default value:
3812 ::
3813
3814 KERNEL_ARTIFACT_NAME ?= "${PKGE}-${PKGV}-${PKGR}-${MACHINE}${IMAGE_VERSION_SUFFIX}"
3815
Andrew Geissler6ce62a22020-11-30 19:58:47 -06003816 See the :term:`PKGE`, :term:`PKGV`, :term:`PKGR`, :term:`MACHINE`
3817 and :term:`IMAGE_VERSION_SUFFIX` variables for additional information.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003818
Andrew Geisslerf0343792020-11-18 10:42:21 -06003819 :term:`KERNEL_CLASSES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003820 A list of classes defining kernel image types that the
3821 :ref:`kernel <ref-classes-kernel>` class should inherit. You
3822 typically append this variable to enable extended image types. An
3823 example is the "kernel-fitimage", which enables fitImage support and
3824 resides in ``meta/classes/kernel-fitimage.bbclass``. You can register
3825 custom kernel image types with the ``kernel`` class using this
3826 variable.
3827
Andrew Geisslerf0343792020-11-18 10:42:21 -06003828 :term:`KERNEL_DEVICETREE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003829 Specifies the name of the generated Linux kernel device tree (i.e.
3830 the ``.dtb``) file.
3831
3832 .. note::
3833
3834 Legacy support exists for specifying the full path to the device
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003835 tree. However, providing just the ``.dtb`` file is preferred.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003836
3837 In order to use this variable, the
3838 :ref:`kernel-devicetree <ref-classes-kernel-devicetree>` class must
3839 be inherited.
3840
Andrew Geisslerf0343792020-11-18 10:42:21 -06003841 :term:`KERNEL_DTB_LINK_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003842 The link name of the kernel device tree binary (DTB). This variable
3843 is set in the ``meta/classes/kernel-artifact-names.bbclass`` file as
3844 follows:
3845 ::
3846
3847 KERNEL_DTB_LINK_NAME ?= "${KERNEL_ARTIFACT_LINK_NAME}"
3848
3849 The
3850 value of the ``KERNEL_ARTIFACT_LINK_NAME`` variable, which is set in
3851 the same file, has the following value:
3852 ::
3853
3854 KERNEL_ARTIFACT_LINK_NAME ?= "${MACHINE}"
3855
3856 See the :term:`MACHINE` variable for additional
3857 information.
3858
Andrew Geisslerf0343792020-11-18 10:42:21 -06003859 :term:`KERNEL_DTB_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003860 The base name of the kernel device tree binary (DTB). This variable
3861 is set in the ``meta/classes/kernel-artifact-names.bbclass`` file as
3862 follows:
3863 ::
3864
3865 KERNEL_DTB_NAME ?= "${KERNEL_ARTIFACT_NAME}"
3866
3867 The value of the :term:`KERNEL_ARTIFACT_NAME`
3868 variable, which is set in the same file, has the following value:
3869 ::
3870
3871 KERNEL_ARTIFACT_NAME ?= "${PKGE}-${PKGV}-${PKGR}-${MACHINE}${IMAGE_VERSION_SUFFIX}"
3872
Andrew Geisslerf0343792020-11-18 10:42:21 -06003873 :term:`KERNEL_EXTRA_ARGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003874 Specifies additional ``make`` command-line arguments the OpenEmbedded
3875 build system passes on when compiling the kernel.
3876
Andrew Geisslerf0343792020-11-18 10:42:21 -06003877 :term:`KERNEL_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003878 Includes additional kernel metadata. In the OpenEmbedded build
3879 system, the default Board Support Packages (BSPs)
3880 :term:`Metadata` is provided through the
3881 :term:`KMACHINE` and :term:`KBRANCH`
3882 variables. You can use the ``KERNEL_FEATURES`` variable from within
3883 the kernel recipe or kernel append file to further add metadata for
3884 all BSPs or specific BSPs.
3885
3886 The metadata you add through this variable includes config fragments
3887 and features descriptions, which usually includes patches as well as
3888 config fragments. You typically override the ``KERNEL_FEATURES``
3889 variable for a specific machine. In this way, you can provide
3890 validated, but optional, sets of kernel configurations and features.
3891
3892 For example, the following example from the ``linux-yocto-rt_4.12``
3893 kernel recipe adds "netfilter" and "taskstats" features to all BSPs
3894 as well as "virtio" configurations to all QEMU machines. The last two
3895 statements add specific configurations to targeted machine types:
3896 ::
3897
3898 KERNEL_EXTRA_FEATURES ?= "features/netfilter/netfilter.scc features/taskstats/taskstats.scc"
3899 KERNEL_FEATURES_append = "${KERNEL_EXTRA_FEATURES}"
3900 KERNEL_FEATURES_append_qemuall = "cfg/virtio.scc"
3901 KERNEL_FEATURES_append_qemux86 = " cfg/sound.scc cfg/paravirt_kvm.scc"
3902 KERNEL_FEATURES_append_qemux86-64 = "cfg/sound.scc"
3903
Andrew Geisslerf0343792020-11-18 10:42:21 -06003904 :term:`KERNEL_FIT_LINK_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003905 The link name of the kernel flattened image tree (FIT) image. This
3906 variable is set in the ``meta/classes/kernel-artifact-names.bbclass``
3907 file as follows:
3908 ::
3909
3910 KERNEL_FIT_LINK_NAME ?= "${KERNEL_ARTIFACT_LINK_NAME}"
3911
3912 The value of the
3913 ``KERNEL_ARTIFACT_LINK_NAME`` variable, which is set in the same
3914 file, has the following value:
3915 ::
3916
3917 KERNEL_ARTIFACT_LINK_NAME ?= "${MACHINE}"
3918
3919 See the :term:`MACHINE` variable for additional
3920 information.
3921
Andrew Geisslerf0343792020-11-18 10:42:21 -06003922 :term:`KERNEL_FIT_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003923 The base name of the kernel flattened image tree (FIT) image. This
3924 variable is set in the ``meta/classes/kernel-artifact-names.bbclass``
3925 file as follows:
3926 ::
3927
3928 KERNEL_FIT_NAME ?= "${KERNEL_ARTIFACT_NAME}"
3929
3930 The value of the :term:`KERNEL_ARTIFACT_NAME`
3931 variable, which is set in the same file, has the following value:
3932 ::
3933
3934 KERNEL_ARTIFACT_NAME ?= "${PKGE}-${PKGV}-${PKGR}-${MACHINE}${IMAGE_VERSION_SUFFIX}"
3935
Andrew Geisslerf0343792020-11-18 10:42:21 -06003936 :term:`KERNEL_IMAGE_LINK_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003937 The link name for the kernel image. This variable is set in the
3938 ``meta/classes/kernel-artifact-names.bbclass`` file as follows:
3939 ::
3940
3941 KERNEL_IMAGE_LINK_NAME ?= "${KERNEL_ARTIFACT_LINK_NAME}"
3942
3943 The value of
3944 the ``KERNEL_ARTIFACT_LINK_NAME`` variable, which is set in the same
3945 file, has the following value:
3946 ::
3947
3948 KERNEL_ARTIFACT_LINK_NAME ?= "${MACHINE}"
3949
3950 See the :term:`MACHINE` variable for additional
3951 information.
3952
Andrew Geisslerf0343792020-11-18 10:42:21 -06003953 :term:`KERNEL_IMAGE_MAXSIZE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003954 Specifies the maximum size of the kernel image file in kilobytes. If
3955 ``KERNEL_IMAGE_MAXSIZE`` is set, the size of the kernel image file is
3956 checked against the set value during the
3957 :ref:`ref-tasks-sizecheck` task. The task fails if
3958 the kernel image file is larger than the setting.
3959
3960 ``KERNEL_IMAGE_MAXSIZE`` is useful for target devices that have a
3961 limited amount of space in which the kernel image must be stored.
3962
3963 By default, this variable is not set, which means the size of the
3964 kernel image is not checked.
3965
Andrew Geisslerf0343792020-11-18 10:42:21 -06003966 :term:`KERNEL_IMAGE_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003967 The base name of the kernel image. This variable is set in the
3968 ``meta/classes/kernel-artifact-names.bbclass`` file as follows:
3969 ::
3970
3971 KERNEL_IMAGE_NAME ?= "${KERNEL_ARTIFACT_NAME}"
3972
3973 The value of the
3974 :term:`KERNEL_ARTIFACT_NAME` variable,
3975 which is set in the same file, has the following value:
3976 ::
3977
3978 KERNEL_ARTIFACT_NAME ?= "${PKGE}-${PKGV}-${PKGR}-${MACHINE}${IMAGE_VERSION_SUFFIX}"
3979
Andrew Geisslerf0343792020-11-18 10:42:21 -06003980 :term:`KERNEL_IMAGETYPE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003981 The type of kernel to build for a device, usually set by the machine
3982 configuration files and defaults to "zImage". This variable is used
3983 when building the kernel and is passed to ``make`` as the target to
3984 build.
3985
Andrew Geissler706d5aa2021-02-12 15:55:30 -06003986 If you want to build an alternate kernel image type, use the
3987 :term:`KERNEL_ALT_IMAGETYPE` variable.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003988
Andrew Geisslerf0343792020-11-18 10:42:21 -06003989 :term:`KERNEL_MODULE_AUTOLOAD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003990 Lists kernel modules that need to be auto-loaded during boot.
3991
3992 .. note::
3993
Andrew Geissler4c19ea12020-10-27 13:52:24 -05003994 This variable replaces the deprecated :term:`module_autoload`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003995 variable.
3996
3997 You can use the ``KERNEL_MODULE_AUTOLOAD`` variable anywhere that it
3998 can be recognized by the kernel recipe or by an out-of-tree kernel
3999 module recipe (e.g. a machine configuration file, a distribution
4000 configuration file, an append file for the recipe, or the recipe
4001 itself).
4002
4003 Specify it as follows:
4004 ::
4005
4006 KERNEL_MODULE_AUTOLOAD += "module_name1 module_name2 module_name3"
4007
4008 Including ``KERNEL_MODULE_AUTOLOAD`` causes the OpenEmbedded build
4009 system to populate the ``/etc/modules-load.d/modname.conf`` file with
4010 the list of modules to be auto-loaded on boot. The modules appear
4011 one-per-line in the file. Here is an example of the most common use
4012 case:
4013 ::
4014
4015 KERNEL_MODULE_AUTOLOAD += "module_name"
4016
4017 For information on how to populate the ``modname.conf`` file with
4018 ``modprobe.d`` syntax lines, see the :term:`KERNEL_MODULE_PROBECONF` variable.
4019
Andrew Geisslerf0343792020-11-18 10:42:21 -06004020 :term:`KERNEL_MODULE_PROBECONF`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004021 Provides a list of modules for which the OpenEmbedded build system
4022 expects to find ``module_conf_``\ modname values that specify
4023 configuration for each of the modules. For information on how to
4024 provide those module configurations, see the
4025 :term:`module_conf_* <module_conf>` variable.
4026
Andrew Geisslerf0343792020-11-18 10:42:21 -06004027 :term:`KERNEL_PATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004028 The location of the kernel sources. This variable is set to the value
4029 of the :term:`STAGING_KERNEL_DIR` within
4030 the :ref:`module <ref-classes-module>` class. For information on
4031 how this variable is used, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06004032 ":ref:`kernel-dev/common:incorporating out-of-tree modules`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004033 section in the Yocto Project Linux Kernel Development Manual.
4034
4035 To help maximize compatibility with out-of-tree drivers used to build
4036 modules, the OpenEmbedded build system also recognizes and uses the
4037 :term:`KERNEL_SRC` variable, which is identical to
4038 the ``KERNEL_PATH`` variable. Both variables are common variables
4039 used by external Makefiles to point to the kernel source directory.
4040
Andrew Geisslerf0343792020-11-18 10:42:21 -06004041 :term:`KERNEL_SRC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004042 The location of the kernel sources. This variable is set to the value
4043 of the :term:`STAGING_KERNEL_DIR` within
4044 the :ref:`module <ref-classes-module>` class. For information on
4045 how this variable is used, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06004046 ":ref:`kernel-dev/common:incorporating out-of-tree modules`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004047 section in the Yocto Project Linux Kernel Development Manual.
4048
4049 To help maximize compatibility with out-of-tree drivers used to build
4050 modules, the OpenEmbedded build system also recognizes and uses the
4051 :term:`KERNEL_PATH` variable, which is identical
4052 to the ``KERNEL_SRC`` variable. Both variables are common variables
4053 used by external Makefiles to point to the kernel source directory.
4054
Andrew Geisslerf0343792020-11-18 10:42:21 -06004055 :term:`KERNEL_VERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004056 Specifies the version of the kernel as extracted from ``version.h``
4057 or ``utsrelease.h`` within the kernel sources. Effects of setting
4058 this variable do not take affect until the kernel has been
4059 configured. Consequently, attempting to refer to this variable in
4060 contexts prior to configuration will not work.
4061
Andrew Geisslerf0343792020-11-18 10:42:21 -06004062 :term:`KERNELDEPMODDEPEND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004063 Specifies whether the data referenced through
4064 :term:`PKGDATA_DIR` is needed or not. The
4065 ``KERNELDEPMODDEPEND`` does not control whether or not that data
4066 exists, but simply whether or not it is used. If you do not need to
4067 use the data, set the ``KERNELDEPMODDEPEND`` variable in your
4068 ``initramfs`` recipe. Setting the variable there when the data is not
4069 needed avoids a potential dependency loop.
4070
Andrew Geisslerf0343792020-11-18 10:42:21 -06004071 :term:`KFEATURE_DESCRIPTION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004072 Provides a short description of a configuration fragment. You use
4073 this variable in the ``.scc`` file that describes a configuration
4074 fragment file. Here is the variable used in a file named ``smp.scc``
4075 to describe SMP being enabled:
4076 ::
4077
4078 define KFEATURE_DESCRIPTION "Enable SMP"
4079
Andrew Geisslerf0343792020-11-18 10:42:21 -06004080 :term:`KMACHINE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004081 The machine as known by the kernel. Sometimes the machine name used
4082 by the kernel does not match the machine name used by the
4083 OpenEmbedded build system. For example, the machine name that the
4084 OpenEmbedded build system understands as ``core2-32-intel-common``
4085 goes by a different name in the Linux Yocto kernel. The kernel
4086 understands that machine as ``intel-core2-32``. For cases like these,
4087 the ``KMACHINE`` variable maps the kernel machine name to the
4088 OpenEmbedded build system machine name.
4089
4090 These mappings between different names occur in the Yocto Linux
4091 Kernel's ``meta`` branch. As an example take a look in the
4092 ``common/recipes-kernel/linux/linux-yocto_3.19.bbappend`` file:
4093 ::
4094
4095 LINUX_VERSION_core2-32-intel-common = "3.19.0"
4096 COMPATIBLE_MACHINE_core2-32-intel-common = "${MACHINE}"
4097 SRCREV_meta_core2-32-intel-common = "8897ef68b30e7426bc1d39895e71fb155d694974"
4098 SRCREV_machine_core2-32-intel-common = "43b9eced9ba8a57add36af07736344dcc383f711"
4099 KMACHINE_core2-32-intel-common = "intel-core2-32"
4100 KBRANCH_core2-32-intel-common = "standard/base"
4101 KERNEL_FEATURES_append_core2-32-intel-common = "${KERNEL_FEATURES_INTEL_COMMON}"
4102
4103 The ``KMACHINE`` statement says
4104 that the kernel understands the machine name as "intel-core2-32".
4105 However, the OpenEmbedded build system understands the machine as
4106 "core2-32-intel-common".
4107
Andrew Geisslerf0343792020-11-18 10:42:21 -06004108 :term:`KTYPE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004109 Defines the kernel type to be used in assembling the configuration.
4110 The linux-yocto recipes define "standard", "tiny", and "preempt-rt"
Andrew Geissler09209ee2020-12-13 08:44:15 -06004111 kernel types. See the ":ref:`kernel-dev/advanced:kernel types`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004112 section in the
4113 Yocto Project Linux Kernel Development Manual for more information on
4114 kernel types.
4115
4116 You define the ``KTYPE`` variable in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06004117 :ref:`kernel-dev/advanced:bsp descriptions`. The
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004118 value you use must match the value used for the
4119 :term:`LINUX_KERNEL_TYPE` value used by the
4120 kernel recipe.
4121
Andrew Geisslerf0343792020-11-18 10:42:21 -06004122 :term:`LABELS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004123 Provides a list of targets for automatic configuration.
4124
4125 See the :ref:`grub-efi <ref-classes-grub-efi>` class for more
4126 information on how this variable is used.
4127
Andrew Geisslerf0343792020-11-18 10:42:21 -06004128 :term:`LAYERDEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004129 Lists the layers, separated by spaces, on which this recipe depends.
4130 Optionally, you can specify a specific layer version for a dependency
4131 by adding it to the end of the layer name. Here is an example:
4132 ::
4133
4134 LAYERDEPENDS_mylayer = "anotherlayer (=3)"
4135
4136 In this previous example,
4137 version 3 of "anotherlayer" is compared against
4138 :term:`LAYERVERSION`\ ``_anotherlayer``.
4139
4140 An error is produced if any dependency is missing or the version
4141 numbers (if specified) do not match exactly. This variable is used in
4142 the ``conf/layer.conf`` file and must be suffixed with the name of
4143 the specific layer (e.g. ``LAYERDEPENDS_mylayer``).
4144
Andrew Geisslerf0343792020-11-18 10:42:21 -06004145 :term:`LAYERDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004146 When used inside the ``layer.conf`` configuration file, this variable
4147 provides the path of the current layer. This variable is not
4148 available outside of ``layer.conf`` and references are expanded
4149 immediately when parsing of the file completes.
4150
Andrew Geisslerf0343792020-11-18 10:42:21 -06004151 :term:`LAYERRECOMMENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004152 Lists the layers, separated by spaces, recommended for use with this
4153 layer.
4154
4155 Optionally, you can specify a specific layer version for a
4156 recommendation by adding the version to the end of the layer name.
4157 Here is an example:
4158 ::
4159
4160 LAYERRECOMMENDS_mylayer = "anotherlayer (=3)"
4161
4162 In this previous example, version 3 of "anotherlayer" is compared
4163 against ``LAYERVERSION_anotherlayer``.
4164
4165 This variable is used in the ``conf/layer.conf`` file and must be
4166 suffixed with the name of the specific layer (e.g.
4167 ``LAYERRECOMMENDS_mylayer``).
4168
Andrew Geisslerf0343792020-11-18 10:42:21 -06004169 :term:`LAYERSERIES_COMPAT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004170 Lists the versions of the :term:`OpenEmbedded-Core (OE-Core)` for which
4171 a layer is compatible. Using the ``LAYERSERIES_COMPAT`` variable
4172 allows the layer maintainer to indicate which combinations of the
4173 layer and OE-Core can be expected to work. The variable gives the
4174 system a way to detect when a layer has not been tested with new
4175 releases of OE-Core (e.g. the layer is not maintained).
4176
4177 To specify the OE-Core versions for which a layer is compatible, use
4178 this variable in your layer's ``conf/layer.conf`` configuration file.
4179 For the list, use the Yocto Project
Andrew Geissler09209ee2020-12-13 08:44:15 -06004180 :yocto_wiki:`Release Name </Releases>` (e.g.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004181 DISTRO_NAME_NO_CAP). To specify multiple OE-Core versions for the
4182 layer, use a space-separated list:
4183 ::
4184
4185 LAYERSERIES_COMPAT_layer_root_name = "DISTRO_NAME_NO_CAP DISTRO_NAME_NO_CAP_MINUS_ONE"
4186
4187 .. note::
4188
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004189 Setting ``LAYERSERIES_COMPAT`` is required by the Yocto Project
4190 Compatible version 2 standard.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004191 The OpenEmbedded build system produces a warning if the variable
4192 is not set for any given layer.
4193
Andrew Geissler09209ee2020-12-13 08:44:15 -06004194 See the ":ref:`dev-manual/common-tasks:creating your own layer`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004195 section in the Yocto Project Development Tasks Manual.
4196
Andrew Geisslerf0343792020-11-18 10:42:21 -06004197 :term:`LAYERVERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004198 Optionally specifies the version of a layer as a single number. You
4199 can use this within :term:`LAYERDEPENDS` for
4200 another layer in order to depend on a specific version of the layer.
4201 This variable is used in the ``conf/layer.conf`` file and must be
4202 suffixed with the name of the specific layer (e.g.
4203 ``LAYERVERSION_mylayer``).
4204
Andrew Geisslerf0343792020-11-18 10:42:21 -06004205 :term:`LD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004206 The minimal command and arguments used to run the linker.
4207
Andrew Geisslerf0343792020-11-18 10:42:21 -06004208 :term:`LDFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004209 Specifies the flags to pass to the linker. This variable is exported
4210 to an environment variable and thus made visible to the software
4211 being built during the compilation step.
4212
4213 Default initialization for ``LDFLAGS`` varies depending on what is
4214 being built:
4215
4216 - :term:`TARGET_LDFLAGS` when building for the
4217 target
4218
4219 - :term:`BUILD_LDFLAGS` when building for the
4220 build host (i.e. ``-native``)
4221
4222 - :term:`BUILDSDK_LDFLAGS` when building for
4223 an SDK (i.e. ``nativesdk-``)
4224
Andrew Geisslerf0343792020-11-18 10:42:21 -06004225 :term:`LEAD_SONAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004226 Specifies the lead (or primary) compiled library file (i.e. ``.so``)
4227 that the :ref:`debian <ref-classes-debian>` class applies its
4228 naming policy to given a recipe that packages multiple libraries.
4229
4230 This variable works in conjunction with the ``debian`` class.
4231
Andrew Geisslerf0343792020-11-18 10:42:21 -06004232 :term:`LIC_FILES_CHKSUM`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004233 Checksums of the license text in the recipe source code.
4234
4235 This variable tracks changes in license text of the source code
4236 files. If the license text is changed, it will trigger a build
4237 failure, which gives the developer an opportunity to review any
4238 license change.
4239
4240 This variable must be defined for all recipes (unless
4241 :term:`LICENSE` is set to "CLOSED").
4242
Andrew Geissler09209ee2020-12-13 08:44:15 -06004243 For more information, see the ":ref:`dev-manual/common-tasks:tracking license changes`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004244 section in the Yocto Project Development Tasks Manual.
4245
Andrew Geisslerf0343792020-11-18 10:42:21 -06004246 :term:`LICENSE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004247 The list of source licenses for the recipe. Follow these rules:
4248
4249 - Do not use spaces within individual license names.
4250
4251 - Separate license names using \| (pipe) when there is a choice
4252 between licenses.
4253
4254 - Separate license names using & (ampersand) when multiple licenses
4255 exist that cover different parts of the source.
4256
4257 - You can use spaces between license names.
4258
4259 - For standard licenses, use the names of the files in
4260 ``meta/files/common-licenses/`` or the
4261 :term:`SPDXLICENSEMAP` flag names defined in
4262 ``meta/conf/licenses.conf``.
4263
4264 Here are some examples:
4265 ::
4266
4267 LICENSE = "LGPLv2.1 | GPLv3"
4268 LICENSE = "MPL-1 & LGPLv2.1"
4269 LICENSE = "GPLv2+"
4270
4271 The first example is from the
4272 recipes for Qt, which the user may choose to distribute under either
4273 the LGPL version 2.1 or GPL version 3. The second example is from
4274 Cairo where two licenses cover different parts of the source code.
4275 The final example is from ``sysstat``, which presents a single
4276 license.
4277
4278 You can also specify licenses on a per-package basis to handle
4279 situations where components of the output have different licenses.
4280 For example, a piece of software whose code is licensed under GPLv2
4281 but has accompanying documentation licensed under the GNU Free
4282 Documentation License 1.2 could be specified as follows:
4283 ::
4284
4285 LICENSE = "GFDL-1.2 & GPLv2"
4286 LICENSE_${PN} = "GPLv2"
4287 LICENSE_${PN}-doc = "GFDL-1.2"
4288
Andrew Geisslerf0343792020-11-18 10:42:21 -06004289 :term:`LICENSE_CREATE_PACKAGE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004290 Setting ``LICENSE_CREATE_PACKAGE`` to "1" causes the OpenEmbedded
4291 build system to create an extra package (i.e.
4292 ``${``\ :term:`PN`\ ``}-lic``) for each recipe and to add
4293 those packages to the
4294 :term:`RRECOMMENDS`\ ``_${PN}``.
4295
4296 The ``${PN}-lic`` package installs a directory in
4297 ``/usr/share/licenses`` named ``${PN}``, which is the recipe's base
4298 name, and installs files in that directory that contain license and
4299 copyright information (i.e. copies of the appropriate license files
4300 from ``meta/common-licenses`` that match the licenses specified in
4301 the :term:`LICENSE` variable of the recipe metadata
4302 and copies of files marked in
4303 :term:`LIC_FILES_CHKSUM` as containing
4304 license text).
4305
4306 For related information on providing license text, see the
4307 :term:`COPY_LIC_DIRS` variable, the
4308 :term:`COPY_LIC_MANIFEST` variable, and the
Andrew Geissler09209ee2020-12-13 08:44:15 -06004309 ":ref:`dev-manual/common-tasks:providing license text`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004310 section in the Yocto Project Development Tasks Manual.
4311
Andrew Geisslerf0343792020-11-18 10:42:21 -06004312 :term:`LICENSE_FLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004313 Specifies additional flags for a recipe you must whitelist through
4314 :term:`LICENSE_FLAGS_WHITELIST` in
4315 order to allow the recipe to be built. When providing multiple flags,
4316 separate them with spaces.
4317
4318 This value is independent of :term:`LICENSE` and is
4319 typically used to mark recipes that might require additional licenses
4320 in order to be used in a commercial product. For more information,
4321 see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06004322 ":ref:`dev-manual/common-tasks:enabling commercially licensed recipes`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004323 section in the Yocto Project Development Tasks Manual.
4324
Andrew Geisslerf0343792020-11-18 10:42:21 -06004325 :term:`LICENSE_FLAGS_WHITELIST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004326 Lists license flags that when specified in
4327 :term:`LICENSE_FLAGS` within a recipe should not
4328 prevent that recipe from being built. This practice is otherwise
4329 known as "whitelisting" license flags. For more information, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06004330 ":ref:`dev-manual/common-tasks:enabling commercially licensed recipes`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004331 section in the Yocto Project Development Tasks Manual.
4332
Andrew Geisslerf0343792020-11-18 10:42:21 -06004333 :term:`LICENSE_PATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004334 Path to additional licenses used during the build. By default, the
4335 OpenEmbedded build system uses ``COMMON_LICENSE_DIR`` to define the
4336 directory that holds common license text used during the build. The
4337 ``LICENSE_PATH`` variable allows you to extend that location to other
4338 areas that have additional licenses:
4339 ::
4340
4341 LICENSE_PATH += "path-to-additional-common-licenses"
4342
Andrew Geisslerf0343792020-11-18 10:42:21 -06004343 :term:`LINUX_KERNEL_TYPE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004344 Defines the kernel type to be used in assembling the configuration.
4345 The linux-yocto recipes define "standard", "tiny", and "preempt-rt"
Andrew Geissler09209ee2020-12-13 08:44:15 -06004346 kernel types. See the ":ref:`kernel-dev/advanced:kernel types`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004347 section in the
4348 Yocto Project Linux Kernel Development Manual for more information on
4349 kernel types.
4350
4351 If you do not specify a ``LINUX_KERNEL_TYPE``, it defaults to
4352 "standard". Together with :term:`KMACHINE`, the
4353 ``LINUX_KERNEL_TYPE`` variable defines the search arguments used by
4354 the kernel tools to find the appropriate description within the
4355 kernel :term:`Metadata` with which to build out the sources
4356 and configuration.
4357
Andrew Geisslerf0343792020-11-18 10:42:21 -06004358 :term:`LINUX_VERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004359 The Linux version from ``kernel.org`` on which the Linux kernel image
4360 being built using the OpenEmbedded build system is based. You define
4361 this variable in the kernel recipe. For example, the
4362 ``linux-yocto-3.4.bb`` kernel recipe found in
4363 ``meta/recipes-kernel/linux`` defines the variables as follows:
4364 ::
4365
4366 LINUX_VERSION ?= "3.4.24"
4367
4368 The ``LINUX_VERSION`` variable is used to define :term:`PV`
4369 for the recipe:
4370 ::
4371
4372 PV = "${LINUX_VERSION}+git${SRCPV}"
4373
Andrew Geisslerf0343792020-11-18 10:42:21 -06004374 :term:`LINUX_VERSION_EXTENSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004375 A string extension compiled into the version string of the Linux
4376 kernel built with the OpenEmbedded build system. You define this
4377 variable in the kernel recipe. For example, the linux-yocto kernel
4378 recipes all define the variable as follows:
4379 ::
4380
4381 LINUX_VERSION_EXTENSION ?= "-yocto-${LINUX_KERNEL_TYPE}"
4382
4383 Defining this variable essentially sets the Linux kernel
4384 configuration item ``CONFIG_LOCALVERSION``, which is visible through
4385 the ``uname`` command. Here is an example that shows the extension
4386 assuming it was set as previously shown:
4387 ::
4388
4389 $ uname -r
4390 3.7.0-rc8-custom
4391
Andrew Geisslerf0343792020-11-18 10:42:21 -06004392 :term:`LOG_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004393 Specifies the directory to which the OpenEmbedded build system writes
4394 overall log files. The default directory is ``${TMPDIR}/log``.
4395
4396 For the directory containing logs specific to each task, see the
4397 :term:`T` variable.
4398
Andrew Geisslerf0343792020-11-18 10:42:21 -06004399 :term:`MACHINE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004400 Specifies the target device for which the image is built. You define
4401 ``MACHINE`` in the ``local.conf`` file found in the
4402 :term:`Build Directory`. By default, ``MACHINE`` is set to
4403 "qemux86", which is an x86-based architecture machine to be emulated
4404 using QEMU:
4405 ::
4406
4407 MACHINE ?= "qemux86"
4408
4409 The variable corresponds to a machine configuration file of the same
4410 name, through which machine-specific configurations are set. Thus,
4411 when ``MACHINE`` is set to "qemux86" there exists the corresponding
4412 ``qemux86.conf`` machine configuration file, which can be found in
4413 the :term:`Source Directory` in
4414 ``meta/conf/machine``.
4415
4416 The list of machines supported by the Yocto Project as shipped
4417 include the following:
4418 ::
4419
4420 MACHINE ?= "qemuarm"
4421 MACHINE ?= "qemuarm64"
4422 MACHINE ?= "qemumips"
4423 MACHINE ?= "qemumips64"
4424 MACHINE ?= "qemuppc"
4425 MACHINE ?= "qemux86"
4426 MACHINE ?= "qemux86-64"
4427 MACHINE ?= "genericx86"
4428 MACHINE ?= "genericx86-64"
4429 MACHINE ?= "beaglebone"
4430 MACHINE ?= "edgerouter"
4431
4432 The last five are Yocto Project reference hardware
4433 boards, which are provided in the ``meta-yocto-bsp`` layer.
4434
4435 .. note::
4436
4437 Adding additional Board Support Package (BSP) layers to your
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004438 configuration adds new possible settings for ``MACHINE``.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004439
Andrew Geisslerf0343792020-11-18 10:42:21 -06004440 :term:`MACHINE_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004441 Specifies the name of the machine-specific architecture. This
4442 variable is set automatically from :term:`MACHINE` or
4443 :term:`TUNE_PKGARCH`. You should not hand-edit
4444 the ``MACHINE_ARCH`` variable.
4445
Andrew Geisslerf0343792020-11-18 10:42:21 -06004446 :term:`MACHINE_ESSENTIAL_EXTRA_RDEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004447 A list of required machine-specific packages to install as part of
4448 the image being built. The build process depends on these packages
4449 being present. Furthermore, because this is a "machine-essential"
4450 variable, the list of packages are essential for the machine to boot.
4451 The impact of this variable affects images based on
4452 ``packagegroup-core-boot``, including the ``core-image-minimal``
4453 image.
4454
4455 This variable is similar to the
4456 ``MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS`` variable with the exception
4457 that the image being built has a build dependency on the variable's
4458 list of packages. In other words, the image will not build if a file
4459 in this list is not found.
4460
4461 As an example, suppose the machine for which you are building
4462 requires ``example-init`` to be run during boot to initialize the
4463 hardware. In this case, you would use the following in the machine's
4464 ``.conf`` configuration file:
4465 ::
4466
4467 MACHINE_ESSENTIAL_EXTRA_RDEPENDS += "example-init"
4468
Andrew Geisslerf0343792020-11-18 10:42:21 -06004469 :term:`MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004470 A list of recommended machine-specific packages to install as part of
4471 the image being built. The build process does not depend on these
4472 packages being present. However, because this is a
4473 "machine-essential" variable, the list of packages are essential for
4474 the machine to boot. The impact of this variable affects images based
4475 on ``packagegroup-core-boot``, including the ``core-image-minimal``
4476 image.
4477
4478 This variable is similar to the ``MACHINE_ESSENTIAL_EXTRA_RDEPENDS``
4479 variable with the exception that the image being built does not have
4480 a build dependency on the variable's list of packages. In other
4481 words, the image will still build if a package in this list is not
4482 found. Typically, this variable is used to handle essential kernel
4483 modules, whose functionality may be selected to be built into the
4484 kernel rather than as a module, in which case a package will not be
4485 produced.
4486
4487 Consider an example where you have a custom kernel where a specific
4488 touchscreen driver is required for the machine to be usable. However,
4489 the driver can be built as a module or into the kernel depending on
4490 the kernel configuration. If the driver is built as a module, you
4491 want it to be installed. But, when the driver is built into the
4492 kernel, you still want the build to succeed. This variable sets up a
4493 "recommends" relationship so that in the latter case, the build will
4494 not fail due to the missing package. To accomplish this, assuming the
4495 package for the module was called ``kernel-module-ab123``, you would
4496 use the following in the machine's ``.conf`` configuration file:
4497 ::
4498
4499 MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += "kernel-module-ab123"
4500
4501 .. note::
4502
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004503 In this example, the ``kernel-module-ab123`` recipe needs to
4504 explicitly set its :term:`PACKAGES` variable to ensure that BitBake
4505 does not use the kernel recipe's :term:`PACKAGES_DYNAMIC` variable to
4506 satisfy the dependency.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004507
4508 Some examples of these machine essentials are flash, screen,
4509 keyboard, mouse, or touchscreen drivers (depending on the machine).
4510
Andrew Geisslerf0343792020-11-18 10:42:21 -06004511 :term:`MACHINE_EXTRA_RDEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004512 A list of machine-specific packages to install as part of the image
4513 being built that are not essential for the machine to boot. However,
4514 the build process for more fully-featured images depends on the
4515 packages being present.
4516
4517 This variable affects all images based on ``packagegroup-base``,
4518 which does not include the ``core-image-minimal`` or
4519 ``core-image-full-cmdline`` images.
4520
4521 The variable is similar to the ``MACHINE_EXTRA_RRECOMMENDS`` variable
4522 with the exception that the image being built has a build dependency
4523 on the variable's list of packages. In other words, the image will
4524 not build if a file in this list is not found.
4525
4526 An example is a machine that has WiFi capability but is not essential
4527 for the machine to boot the image. However, if you are building a
4528 more fully-featured image, you want to enable the WiFi. The package
4529 containing the firmware for the WiFi hardware is always expected to
4530 exist, so it is acceptable for the build process to depend upon
4531 finding the package. In this case, assuming the package for the
4532 firmware was called ``wifidriver-firmware``, you would use the
4533 following in the ``.conf`` file for the machine:
4534 ::
4535
4536 MACHINE_EXTRA_RDEPENDS += "wifidriver-firmware"
4537
Andrew Geisslerf0343792020-11-18 10:42:21 -06004538 :term:`MACHINE_EXTRA_RRECOMMENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004539 A list of machine-specific packages to install as part of the image
4540 being built that are not essential for booting the machine. The image
4541 being built has no build dependency on this list of packages.
4542
4543 This variable affects only images based on ``packagegroup-base``,
4544 which does not include the ``core-image-minimal`` or
4545 ``core-image-full-cmdline`` images.
4546
4547 This variable is similar to the ``MACHINE_EXTRA_RDEPENDS`` variable
4548 with the exception that the image being built does not have a build
4549 dependency on the variable's list of packages. In other words, the
4550 image will build if a file in this list is not found.
4551
4552 An example is a machine that has WiFi capability but is not essential
4553 For the machine to boot the image. However, if you are building a
4554 more fully-featured image, you want to enable WiFi. In this case, the
4555 package containing the WiFi kernel module will not be produced if the
4556 WiFi driver is built into the kernel, in which case you still want
4557 the build to succeed instead of failing as a result of the package
4558 not being found. To accomplish this, assuming the package for the
4559 module was called ``kernel-module-examplewifi``, you would use the
4560 following in the ``.conf`` file for the machine:
4561 ::
4562
4563 MACHINE_EXTRA_RRECOMMENDS += "kernel-module-examplewifi"
4564
Andrew Geisslerf0343792020-11-18 10:42:21 -06004565 :term:`MACHINE_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004566 Specifies the list of hardware features the
4567 :term:`MACHINE` is capable of supporting. For related
4568 information on enabling features, see the
4569 :term:`DISTRO_FEATURES`,
4570 :term:`COMBINED_FEATURES`, and
4571 :term:`IMAGE_FEATURES` variables.
4572
4573 For a list of hardware features supported by the Yocto Project as
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004574 shipped, see the ":ref:`ref-features-machine`" section.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004575
Andrew Geisslerf0343792020-11-18 10:42:21 -06004576 :term:`MACHINE_FEATURES_BACKFILL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004577 Features to be added to ``MACHINE_FEATURES`` if not also present in
4578 ``MACHINE_FEATURES_BACKFILL_CONSIDERED``.
4579
4580 This variable is set in the ``meta/conf/bitbake.conf`` file. It is
4581 not intended to be user-configurable. It is best to just reference
4582 the variable to see which machine features are being backfilled for
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004583 all machine configurations. See the ":ref:`ref-features-backfill`"
4584 section for more information.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004585
Andrew Geisslerf0343792020-11-18 10:42:21 -06004586 :term:`MACHINE_FEATURES_BACKFILL_CONSIDERED`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004587 Features from ``MACHINE_FEATURES_BACKFILL`` that should not be
4588 backfilled (i.e. added to ``MACHINE_FEATURES``) during the build. See
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004589 the ":ref:`ref-features-backfill`" section for more information.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004590
Andrew Geisslerf0343792020-11-18 10:42:21 -06004591 :term:`MACHINEOVERRIDES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004592 A colon-separated list of overrides that apply to the current
4593 machine. By default, this list includes the value of
4594 :term:`MACHINE`.
4595
4596 You can extend ``MACHINEOVERRIDES`` to add extra overrides that
4597 should apply to a machine. For example, all machines emulated in QEMU
4598 (e.g. ``qemuarm``, ``qemux86``, and so forth) include a file named
4599 ``meta/conf/machine/include/qemu.inc`` that prepends the following
4600 override to ``MACHINEOVERRIDES``:
4601 ::
4602
4603 MACHINEOVERRIDES =. "qemuall:"
4604
4605 This
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004606 override allows variables to be overridden for all machines emulated
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004607 in QEMU, like in the following example from the ``connman-conf``
4608 recipe:
4609 ::
4610
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004611 SRC_URI_append_qemuall = " file://wired.config \
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004612 file://wired-setup \
4613 "
4614
4615 The underlying mechanism behind
4616 ``MACHINEOVERRIDES`` is simply that it is included in the default
4617 value of :term:`OVERRIDES`.
4618
Andrew Geisslerf0343792020-11-18 10:42:21 -06004619 :term:`MAINTAINER`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004620 The email address of the distribution maintainer.
4621
Andrew Geisslerf0343792020-11-18 10:42:21 -06004622 :term:`MIRRORS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004623 Specifies additional paths from which the OpenEmbedded build system
4624 gets source code. When the build system searches for source code, it
4625 first tries the local download directory. If that location fails, the
4626 build system tries locations defined by
4627 :term:`PREMIRRORS`, the upstream source, and then
4628 locations specified by ``MIRRORS`` in that order.
4629
4630 Assuming your distribution (:term:`DISTRO`) is "poky",
4631 the default value for ``MIRRORS`` is defined in the
4632 ``conf/distro/poky.conf`` file in the ``meta-poky`` Git repository.
4633
Andrew Geisslerf0343792020-11-18 10:42:21 -06004634 :term:`MLPREFIX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004635 Specifies a prefix has been added to :term:`PN` to create a
4636 special version of a recipe or package (i.e. a Multilib version). The
4637 variable is used in places where the prefix needs to be added to or
4638 removed from a the name (e.g. the :term:`BPN` variable).
4639 ``MLPREFIX`` gets set when a prefix has been added to ``PN``.
4640
4641 .. note::
4642
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004643 The "ML" in ``MLPREFIX`` stands for "MultiLib". This representation is
4644 historical and comes from a time when ``nativesdk`` was a suffix
4645 rather than a prefix on the recipe name. When ``nativesdk`` was turned
4646 into a prefix, it made sense to set ``MLPREFIX`` for it as well.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004647
4648 To help understand when ``MLPREFIX`` might be needed, consider when
4649 :term:`BBCLASSEXTEND` is used to provide a
4650 ``nativesdk`` version of a recipe in addition to the target version.
4651 If that recipe declares build-time dependencies on tasks in other
4652 recipes by using :term:`DEPENDS`, then a dependency on
4653 "foo" will automatically get rewritten to a dependency on
4654 "nativesdk-foo". However, dependencies like the following will not
4655 get rewritten automatically:
4656 ::
4657
4658 do_foo[depends] += "recipe:do_foo"
4659
4660 If you want such a dependency to also get transformed, you can do the
4661 following:
4662 ::
4663
4664 do_foo[depends] += "${MLPREFIX}recipe:do_foo"
4665
4666 module_autoload
4667 This variable has been replaced by the ``KERNEL_MODULE_AUTOLOAD``
4668 variable. You should replace all occurrences of ``module_autoload``
4669 with additions to ``KERNEL_MODULE_AUTOLOAD``, for example:
4670 ::
4671
4672 module_autoload_rfcomm = "rfcomm"
4673
4674 should now be replaced with:
4675 ::
4676
4677 KERNEL_MODULE_AUTOLOAD += "rfcomm"
4678
4679 See the :term:`KERNEL_MODULE_AUTOLOAD` variable for more information.
4680
4681 module_conf
Andrew Geissler706d5aa2021-02-12 15:55:30 -06004682 Specifies `modprobe.d <http://linux.die.net/man/5/modprobe.d>`_
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004683 syntax lines for inclusion in the ``/etc/modprobe.d/modname.conf``
4684 file.
4685
4686 You can use this variable anywhere that it can be recognized by the
4687 kernel recipe or out-of-tree kernel module recipe (e.g. a machine
4688 configuration file, a distribution configuration file, an append file
4689 for the recipe, or the recipe itself). If you use this variable, you
4690 must also be sure to list the module name in the
4691 :term:`KERNEL_MODULE_AUTOLOAD`
4692 variable.
4693
4694 Here is the general syntax:
4695 ::
4696
4697 module_conf_module_name = "modprobe.d-syntax"
4698
4699 You must use the kernel module name override.
4700
4701 Run ``man modprobe.d`` in the shell to find out more information on
4702 the exact syntax you want to provide with ``module_conf``.
4703
4704 Including ``module_conf`` causes the OpenEmbedded build system to
4705 populate the ``/etc/modprobe.d/modname.conf`` file with
4706 ``modprobe.d`` syntax lines. Here is an example that adds the options
4707 ``arg1`` and ``arg2`` to a module named ``mymodule``:
4708 ::
4709
4710 module_conf_mymodule = "options mymodule arg1=val1 arg2=val2"
4711
4712 For information on how to specify kernel modules to auto-load on
4713 boot, see the :term:`KERNEL_MODULE_AUTOLOAD` variable.
4714
Andrew Geisslerf0343792020-11-18 10:42:21 -06004715 :term:`MODULE_TARBALL_DEPLOY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004716 Controls creation of the ``modules-*.tgz`` file. Set this variable to
4717 "0" to disable creation of this file, which contains all of the
4718 kernel modules resulting from a kernel build.
4719
Andrew Geisslerf0343792020-11-18 10:42:21 -06004720 :term:`MODULE_TARBALL_LINK_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004721 The link name of the kernel module tarball. This variable is set in
4722 the ``meta/classes/kernel-artifact-names.bbclass`` file as follows:
4723 ::
4724
4725 MODULE_TARBALL_LINK_NAME ?= "${KERNEL_ARTIFACT_LINK_NAME}"
4726
4727 The value
4728 of the ``KERNEL_ARTIFACT_LINK_NAME`` variable, which is set in the
4729 same file, has the following value:
4730 ::
4731
4732 KERNEL_ARTIFACT_LINK_NAME ?= "${MACHINE}"
4733
4734 See the :term:`MACHINE` variable for additional information.
4735
Andrew Geisslerf0343792020-11-18 10:42:21 -06004736 :term:`MODULE_TARBALL_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004737 The base name of the kernel module tarball. This variable is set in
4738 the ``meta/classes/kernel-artifact-names.bbclass`` file as follows:
4739 ::
4740
4741 MODULE_TARBALL_NAME ?= "${KERNEL_ARTIFACT_NAME}"
4742
4743 The value of the :term:`KERNEL_ARTIFACT_NAME` variable,
4744 which is set in the same file, has the following value:
4745 ::
4746
4747 KERNEL_ARTIFACT_NAME ?= "${PKGE}-${PKGV}-${PKGR}-${MACHINE}${IMAGE_VERSION_SUFFIX}"
4748
Andrew Geisslerf0343792020-11-18 10:42:21 -06004749 :term:`MULTIMACH_TARGET_SYS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004750 Uniquely identifies the type of the target system for which packages
4751 are being built. This variable allows output for different types of
4752 target systems to be put into different subdirectories of the same
4753 output directory.
4754
4755 The default value of this variable is:
4756 ::
4757
4758 ${PACKAGE_ARCH}${TARGET_VENDOR}-${TARGET_OS}
4759
4760 Some classes (e.g.
4761 :ref:`cross-canadian <ref-classes-cross-canadian>`) modify the
4762 ``MULTIMACH_TARGET_SYS`` value.
4763
4764 See the :term:`STAMP` variable for an example. See the
4765 :term:`STAGING_DIR_TARGET` variable for more information.
4766
Andrew Geisslerf0343792020-11-18 10:42:21 -06004767 :term:`NATIVELSBSTRING`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004768 A string identifying the host distribution. Strings consist of the
4769 host distributor ID followed by the release, as reported by the
4770 ``lsb_release`` tool or as read from ``/etc/lsb-release``. For
4771 example, when running a build on Ubuntu 12.10, the value is
4772 "Ubuntu-12.10". If this information is unable to be determined, the
4773 value resolves to "Unknown".
4774
4775 This variable is used by default to isolate native shared state
4776 packages for different distributions (e.g. to avoid problems with
4777 ``glibc`` version incompatibilities). Additionally, the variable is
4778 checked against
4779 :term:`SANITY_TESTED_DISTROS` if that
4780 variable is set.
4781
Andrew Geisslerf0343792020-11-18 10:42:21 -06004782 :term:`NM`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004783 The minimal command and arguments to run ``nm``.
4784
Andrew Geisslerf0343792020-11-18 10:42:21 -06004785 :term:`NO_GENERIC_LICENSE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004786 Avoids QA errors when you use a non-common, non-CLOSED license in a
4787 recipe. Packages exist, such as the linux-firmware package, with many
4788 licenses that are not in any way common. Also, new licenses are added
4789 occasionally to avoid introducing a lot of common license files,
4790 which are only applicable to a specific package.
4791 ``NO_GENERIC_LICENSE`` is used to allow copying a license that does
4792 not exist in common licenses.
4793
4794 The following example shows how to add ``NO_GENERIC_LICENSE`` to a
4795 recipe:
4796 ::
4797
4798 NO_GENERIC_LICENSE[license_name] = "license_file_in_fetched_source"
4799
4800 The following is an example that
4801 uses the ``LICENSE.Abilis.txt`` file as the license from the fetched
4802 source:
4803 ::
4804
4805 NO_GENERIC_LICENSE[Firmware-Abilis] = "LICENSE.Abilis.txt"
4806
Andrew Geisslerf0343792020-11-18 10:42:21 -06004807 :term:`NO_RECOMMENDATIONS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004808 Prevents installation of all "recommended-only" packages.
4809 Recommended-only packages are packages installed only through the
4810 :term:`RRECOMMENDS` variable). Setting the
4811 ``NO_RECOMMENDATIONS`` variable to "1" turns this feature on: ::
4812
4813 NO_RECOMMENDATIONS = "1"
4814
4815 You can set this variable globally in your ``local.conf`` file or you
4816 can attach it to a specific image recipe by using the recipe name
4817 override: ::
4818
4819 NO_RECOMMENDATIONS_pn-target_image = "1"
4820
4821 It is important to realize that if you choose to not install packages
4822 using this variable and some other packages are dependent on them
4823 (i.e. listed in a recipe's :term:`RDEPENDS`
4824 variable), the OpenEmbedded build system ignores your request and
4825 will install the packages to avoid dependency errors.
4826
4827 .. note::
4828
4829 Some recommended packages might be required for certain system
4830 functionality, such as kernel modules. It is up to you to add
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004831 packages with the :term:`IMAGE_INSTALL` variable.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004832
4833 Support for this variable exists only when using the IPK and RPM
4834 packaging backend. Support does not exist for DEB.
4835
4836 See the :term:`BAD_RECOMMENDATIONS` and
4837 the :term:`PACKAGE_EXCLUDE` variables for
4838 related information.
4839
Andrew Geisslerf0343792020-11-18 10:42:21 -06004840 :term:`NOAUTOPACKAGEDEBUG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004841 Disables auto package from splitting ``.debug`` files. If a recipe
4842 requires ``FILES_${PN}-dbg`` to be set manually, the
4843 ``NOAUTOPACKAGEDEBUG`` can be defined allowing you to define the
4844 content of the debug package. For example:
4845 ::
4846
4847 NOAUTOPACKAGEDEBUG = "1"
4848 FILES_${PN}-dev = "${includedir}/${QT_DIR_NAME}/Qt/*"
4849 FILES_${PN}-dbg = "/usr/src/debug/"
4850 FILES_${QT_BASE_NAME}-demos-doc = "${docdir}/${QT_DIR_NAME}/qch/qt.qch"
4851
Andrew Geisslerf0343792020-11-18 10:42:21 -06004852 :term:`OBJCOPY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004853 The minimal command and arguments to run ``objcopy``.
4854
Andrew Geisslerf0343792020-11-18 10:42:21 -06004855 :term:`OBJDUMP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004856 The minimal command and arguments to run ``objdump``.
4857
Andrew Geisslerf0343792020-11-18 10:42:21 -06004858 :term:`OE_BINCONFIG_EXTRA_MANGLE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004859 When inheriting the :ref:`binconfig <ref-classes-binconfig>` class,
4860 this variable specifies additional arguments passed to the "sed"
4861 command. The sed command alters any paths in configuration scripts
4862 that have been set up during compilation. Inheriting this class
4863 results in all paths in these scripts being changed to point into the
4864 ``sysroots/`` directory so that all builds that use the script will
4865 use the correct directories for the cross compiling layout.
4866
4867 See the ``meta/classes/binconfig.bbclass`` in the
4868 :term:`Source Directory` for details on how this class
4869 applies these additional sed command arguments. For general
4870 information on the ``binconfig`` class, see the
4871 ":ref:`binconfig.bbclass <ref-classes-binconfig>`" section.
4872
Andrew Geisslerf0343792020-11-18 10:42:21 -06004873 :term:`OE_IMPORTS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004874 An internal variable used to tell the OpenEmbedded build system what
4875 Python modules to import for every Python function run by the system.
4876
4877 .. note::
4878
4879 Do not set this variable. It is for internal use only.
4880
Andrew Geisslerf0343792020-11-18 10:42:21 -06004881 :term:`OE_INIT_ENV_SCRIPT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004882 The name of the build environment setup script for the purposes of
4883 setting up the environment within the extensible SDK. The default
4884 value is "oe-init-build-env".
4885
4886 If you use a custom script to set up your build environment, set the
4887 ``OE_INIT_ENV_SCRIPT`` variable to its name.
4888
Andrew Geisslerf0343792020-11-18 10:42:21 -06004889 :term:`OE_TERMINAL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004890 Controls how the OpenEmbedded build system spawns interactive
4891 terminals on the host development system (e.g. using the BitBake
4892 command with the ``-c devshell`` command-line option). For more
Andrew Geissler09209ee2020-12-13 08:44:15 -06004893 information, see the ":ref:`dev-manual/common-tasks:using a development shell`" section in
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004894 the Yocto Project Development Tasks Manual.
4895
4896 You can use the following values for the ``OE_TERMINAL`` variable:
4897
4898 - auto
4899 - gnome
4900 - xfce
4901 - rxvt
4902 - screen
4903 - konsole
4904 - none
4905
Andrew Geisslerf0343792020-11-18 10:42:21 -06004906 :term:`OEROOT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004907 The directory from which the top-level build environment setup script
4908 is sourced. The Yocto Project provides a top-level build environment
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004909 setup script: :ref:`structure-core-script`. When you run this
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004910 script, the ``OEROOT`` variable resolves to the directory that
4911 contains the script.
4912
4913 For additional information on how this variable is used, see the
4914 initialization script.
4915
Andrew Geisslerf0343792020-11-18 10:42:21 -06004916 :term:`OLDEST_KERNEL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004917 Declares the oldest version of the Linux kernel that the produced
4918 binaries must support. This variable is passed into the build of the
4919 Embedded GNU C Library (``glibc``).
4920
4921 The default for this variable comes from the
4922 ``meta/conf/bitbake.conf`` configuration file. You can override this
4923 default by setting the variable in a custom distribution
4924 configuration file.
4925
Andrew Geisslerf0343792020-11-18 10:42:21 -06004926 :term:`OVERRIDES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004927 A colon-separated list of overrides that currently apply. Overrides
4928 are a BitBake mechanism that allows variables to be selectively
4929 overridden at the end of parsing. The set of overrides in
4930 ``OVERRIDES`` represents the "state" during building, which includes
4931 the current recipe being built, the machine for which it is being
4932 built, and so forth.
4933
4934 As an example, if the string "an-override" appears as an element in
4935 the colon-separated list in ``OVERRIDES``, then the following
4936 assignment will override ``FOO`` with the value "overridden" at the
4937 end of parsing:
4938 ::
4939
4940 FOO_an-override = "overridden"
4941
4942 See the
4943 ":ref:`bitbake:bitbake-user-manual/bitbake-user-manual-metadata:conditional syntax (overrides)`"
4944 section in the BitBake User Manual for more information on the
4945 overrides mechanism.
4946
4947 The default value of ``OVERRIDES`` includes the values of the
4948 :term:`CLASSOVERRIDE`,
4949 :term:`MACHINEOVERRIDES`, and
4950 :term:`DISTROOVERRIDES` variables. Another
4951 important override included by default is ``pn-${PN}``. This override
4952 allows variables to be set for a single recipe within configuration
4953 (``.conf``) files. Here is an example:
4954 ::
4955
4956 FOO_pn-myrecipe = "myrecipe-specific value"
4957
4958 .. note::
4959
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004960 An easy way to see what overrides apply is to search for ``OVERRIDES``
4961 in the output of the ``bitbake -e`` command. See the
Andrew Geissler09209ee2020-12-13 08:44:15 -06004962 ":ref:`dev-manual/common-tasks:viewing variable values`" section in the Yocto
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004963 Project Development Tasks Manual for more information.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004964
Andrew Geisslerf0343792020-11-18 10:42:21 -06004965 :term:`P`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004966 The recipe name and version. ``P`` is comprised of the following:
4967 ::
4968
4969 ${PN}-${PV}
4970
Andrew Geisslerf0343792020-11-18 10:42:21 -06004971 :term:`PACKAGE_ADD_METADATA`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004972 This variable defines additional metdata to add to packages.
4973
4974 You may find you need to inject additional metadata into packages.
4975 This variable allows you to do that by setting the injected data as
4976 the value. Multiple fields can be added by splitting the content with
4977 the literal separator "\n".
4978
4979 The suffixes '_IPK', '_DEB', or '_RPM' can be applied to the variable
4980 to do package type specific settings. It can also be made package
4981 specific by using the package name as a suffix.
4982
4983 You can find out more about applying this variable in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06004984 ":ref:`dev-manual/common-tasks:adding custom metadata to packages`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004985 section in the Yocto Project Development Tasks Manual.
4986
Andrew Geisslerf0343792020-11-18 10:42:21 -06004987 :term:`PACKAGE_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004988 The architecture of the resulting package or packages.
4989
4990 By default, the value of this variable is set to
4991 :term:`TUNE_PKGARCH` when building for the
4992 target, :term:`BUILD_ARCH` when building for the
4993 build host, and "${SDK_ARCH}-${SDKPKGSUFFIX}" when building for the
4994 SDK.
4995
4996 .. note::
4997
Andrew Geissler4c19ea12020-10-27 13:52:24 -05004998 See :term:`SDK_ARCH` for more information.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05004999
5000 However, if your recipe's output packages are built specific to the
5001 target machine rather than generally for the architecture of the
5002 machine, you should set ``PACKAGE_ARCH`` to the value of
5003 :term:`MACHINE_ARCH` in the recipe as follows:
5004 ::
5005
5006 PACKAGE_ARCH = "${MACHINE_ARCH}"
5007
Andrew Geisslerf0343792020-11-18 10:42:21 -06005008 :term:`PACKAGE_ARCHS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005009 Specifies a list of architectures compatible with the target machine.
5010 This variable is set automatically and should not normally be
5011 hand-edited. Entries are separated using spaces and listed in order
5012 of priority. The default value for ``PACKAGE_ARCHS`` is "all any
5013 noarch ${PACKAGE_EXTRA_ARCHS} ${MACHINE_ARCH}".
5014
Andrew Geisslerf0343792020-11-18 10:42:21 -06005015 :term:`PACKAGE_BEFORE_PN`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005016 Enables easily adding packages to ``PACKAGES`` before ``${PN}`` so
5017 that those added packages can pick up files that would normally be
5018 included in the default package.
5019
Andrew Geisslerf0343792020-11-18 10:42:21 -06005020 :term:`PACKAGE_CLASSES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005021 This variable, which is set in the ``local.conf`` configuration file
5022 found in the ``conf`` folder of the
5023 :term:`Build Directory`, specifies the package manager the
5024 OpenEmbedded build system uses when packaging data.
5025
5026 You can provide one or more of the following arguments for the
5027 variable: PACKAGE_CLASSES ?= "package_rpm package_deb package_ipk
5028 package_tar"
5029
5030 .. note::
5031
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005032 While it is a legal option, the ``package_tar``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005033 class has limited functionality due to no support for package
5034 dependencies by that backend. Therefore, it is recommended that
5035 you do not use it.
5036
5037 The build system uses only the first argument in the list as the
5038 package manager when creating your image or SDK. However, packages
5039 will be created using any additional packaging classes you specify.
5040 For example, if you use the following in your ``local.conf`` file:
5041 ::
5042
5043 PACKAGE_CLASSES ?= "package_ipk"
5044
5045 The OpenEmbedded build system uses
5046 the IPK package manager to create your image or SDK.
5047
5048 For information on packaging and build performance effects as a
5049 result of the package manager in use, see the
5050 ":ref:`package.bbclass <ref-classes-package>`" section.
5051
Andrew Geisslerf0343792020-11-18 10:42:21 -06005052 :term:`PACKAGE_DEBUG_SPLIT_STYLE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005053 Determines how to split up the binary and debug information when
5054 creating ``*-dbg`` packages to be used with the GNU Project Debugger
5055 (GDB).
5056
5057 With the ``PACKAGE_DEBUG_SPLIT_STYLE`` variable, you can control
5058 where debug information, which can include or exclude source files,
5059 is stored:
5060
5061 - ".debug": Debug symbol files are placed next to the binary in a
5062 ``.debug`` directory on the target. For example, if a binary is
5063 installed into ``/bin``, the corresponding debug symbol files are
5064 installed in ``/bin/.debug``. Source files are placed in
5065 ``/usr/src/debug``.
5066
5067 - "debug-file-directory": Debug symbol files are placed under
5068 ``/usr/lib/debug`` on the target, and separated by the path from
5069 where the binary is installed. For example, if a binary is
5070 installed in ``/bin``, the corresponding debug symbols are
5071 installed in ``/usr/lib/debug/bin``. Source files are placed in
5072 ``/usr/src/debug``.
5073
5074 - "debug-without-src": The same behavior as ".debug" previously
5075 described with the exception that no source files are installed.
5076
5077 - "debug-with-srcpkg": The same behavior as ".debug" previously
5078 described with the exception that all source files are placed in a
5079 separate ``*-src`` pkg. This is the default behavior.
5080
5081 You can find out more about debugging using GDB by reading the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005082 ":ref:`dev-manual/common-tasks:debugging with the gnu project debugger (gdb) remotely`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005083 in the Yocto Project Development Tasks Manual.
5084
Andrew Geisslerf0343792020-11-18 10:42:21 -06005085 :term:`PACKAGE_EXCLUDE_COMPLEMENTARY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005086 Prevents specific packages from being installed when you are
5087 installing complementary packages.
5088
5089 You might find that you want to prevent installing certain packages
5090 when you are installing complementary packages. For example, if you
5091 are using :term:`IMAGE_FEATURES` to install
5092 ``dev-pkgs``, you might not want to install all packages from a
5093 particular multilib. If you find yourself in this situation, you can
5094 use the ``PACKAGE_EXCLUDE_COMPLEMENTARY`` variable to specify regular
5095 expressions to match the packages you want to exclude.
5096
Andrew Geisslerf0343792020-11-18 10:42:21 -06005097 :term:`PACKAGE_EXCLUDE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005098 Lists packages that should not be installed into an image. For
5099 example:
5100 ::
5101
5102 PACKAGE_EXCLUDE = "package_name package_name package_name ..."
5103
5104 You can set this variable globally in your ``local.conf`` file or you
5105 can attach it to a specific image recipe by using the recipe name
5106 override:
5107 ::
5108
5109 PACKAGE_EXCLUDE_pn-target_image = "package_name"
5110
5111 If you choose to not install a package using this variable and some
5112 other package is dependent on it (i.e. listed in a recipe's
5113 :term:`RDEPENDS` variable), the OpenEmbedded build
5114 system generates a fatal installation error. Because the build system
5115 halts the process with a fatal error, you can use the variable with
5116 an iterative development process to remove specific components from a
5117 system.
5118
5119 Support for this variable exists only when using the IPK and RPM
5120 packaging backend. Support does not exist for DEB.
5121
5122 See the :term:`NO_RECOMMENDATIONS` and the
5123 :term:`BAD_RECOMMENDATIONS` variables for
5124 related information.
5125
Andrew Geisslerf0343792020-11-18 10:42:21 -06005126 :term:`PACKAGE_EXTRA_ARCHS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005127 Specifies the list of architectures compatible with the device CPU.
5128 This variable is useful when you build for several different devices
5129 that use miscellaneous processors such as XScale and ARM926-EJS.
5130
Andrew Geisslerf0343792020-11-18 10:42:21 -06005131 :term:`PACKAGE_FEED_ARCHS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005132 Optionally specifies the package architectures used as part of the
5133 package feed URIs during the build. When used, the
5134 ``PACKAGE_FEED_ARCHS`` variable is appended to the final package feed
5135 URI, which is constructed using the
5136 :term:`PACKAGE_FEED_URIS` and
5137 :term:`PACKAGE_FEED_BASE_PATHS`
5138 variables.
5139
5140 .. note::
5141
Andrew Geissler6ce62a22020-11-30 19:58:47 -06005142 You can use the ``PACKAGE_FEED_ARCHS``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005143 variable to whitelist specific package architectures. If you do
5144 not need to whitelist specific architectures, which is a common
5145 case, you can omit this variable. Omitting the variable results in
5146 all available architectures for the current machine being included
5147 into remote package feeds.
5148
5149 Consider the following example where the ``PACKAGE_FEED_URIS``,
5150 ``PACKAGE_FEED_BASE_PATHS``, and ``PACKAGE_FEED_ARCHS`` variables are
5151 defined in your ``local.conf`` file:
5152 ::
5153
5154 PACKAGE_FEED_URIS = "https://example.com/packagerepos/release \
5155 https://example.com/packagerepos/updates"
5156 PACKAGE_FEED_BASE_PATHS = "rpm rpm-dev"
5157 PACKAGE_FEED_ARCHS = "all core2-64"
5158
5159 Given these settings, the resulting package feeds are as follows:
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005160
5161 .. code-block:: none
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005162
5163 https://example.com/packagerepos/release/rpm/all
5164 https://example.com/packagerepos/release/rpm/core2-64
5165 https://example.com/packagerepos/release/rpm-dev/all
5166 https://example.com/packagerepos/release/rpm-dev/core2-64
5167 https://example.com/packagerepos/updates/rpm/all
5168 https://example.com/packagerepos/updates/rpm/core2-64
5169 https://example.com/packagerepos/updates/rpm-dev/all
5170 https://example.com/packagerepos/updates/rpm-dev/core2-64
5171
Andrew Geisslerf0343792020-11-18 10:42:21 -06005172 :term:`PACKAGE_FEED_BASE_PATHS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005173 Specifies the base path used when constructing package feed URIs. The
5174 ``PACKAGE_FEED_BASE_PATHS`` variable makes up the middle portion of a
5175 package feed URI used by the OpenEmbedded build system. The base path
5176 lies between the :term:`PACKAGE_FEED_URIS`
5177 and :term:`PACKAGE_FEED_ARCHS` variables.
5178
5179 Consider the following example where the ``PACKAGE_FEED_URIS``,
5180 ``PACKAGE_FEED_BASE_PATHS``, and ``PACKAGE_FEED_ARCHS`` variables are
5181 defined in your ``local.conf`` file:
5182 ::
5183
5184 PACKAGE_FEED_URIS = "https://example.com/packagerepos/release \
5185 https://example.com/packagerepos/updates"
5186 PACKAGE_FEED_BASE_PATHS = "rpm rpm-dev"
5187 PACKAGE_FEED_ARCHS = "all core2-64"
5188
5189 Given these settings, the resulting package feeds are as follows:
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005190
5191 .. code-block:: none
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005192
5193 https://example.com/packagerepos/release/rpm/all
5194 https://example.com/packagerepos/release/rpm/core2-64
5195 https://example.com/packagerepos/release/rpm-dev/all
5196 https://example.com/packagerepos/release/rpm-dev/core2-64
5197 https://example.com/packagerepos/updates/rpm/all
5198 https://example.com/packagerepos/updates/rpm/core2-64
5199 https://example.com/packagerepos/updates/rpm-dev/all
5200 https://example.com/packagerepos/updates/rpm-dev/core2-64
5201
Andrew Geisslerf0343792020-11-18 10:42:21 -06005202 :term:`PACKAGE_FEED_URIS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005203 Specifies the front portion of the package feed URI used by the
5204 OpenEmbedded build system. Each final package feed URI is comprised
5205 of ``PACKAGE_FEED_URIS``,
5206 :term:`PACKAGE_FEED_BASE_PATHS`, and
5207 :term:`PACKAGE_FEED_ARCHS` variables.
5208
5209 Consider the following example where the ``PACKAGE_FEED_URIS``,
5210 ``PACKAGE_FEED_BASE_PATHS``, and ``PACKAGE_FEED_ARCHS`` variables are
5211 defined in your ``local.conf`` file:
5212 ::
5213
5214 PACKAGE_FEED_URIS = "https://example.com/packagerepos/release \
5215 https://example.com/packagerepos/updates"
5216 PACKAGE_FEED_BASE_PATHS = "rpm rpm-dev"
5217 PACKAGE_FEED_ARCHS = "all core2-64"
5218
5219 Given these settings, the resulting package feeds are as follows:
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005220
5221 .. code-block:: none
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005222
5223 https://example.com/packagerepos/release/rpm/all
5224 https://example.com/packagerepos/release/rpm/core2-64
5225 https://example.com/packagerepos/release/rpm-dev/all
5226 https://example.com/packagerepos/release/rpm-dev/core2-64
5227 https://example.com/packagerepos/updates/rpm/all
5228 https://example.com/packagerepos/updates/rpm/core2-64
5229 https://example.com/packagerepos/updates/rpm-dev/all
5230 https://example.com/packagerepos/updates/rpm-dev/core2-64
5231
Andrew Geisslerf0343792020-11-18 10:42:21 -06005232 :term:`PACKAGE_INSTALL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005233 The final list of packages passed to the package manager for
5234 installation into the image.
5235
5236 Because the package manager controls actual installation of all
5237 packages, the list of packages passed using ``PACKAGE_INSTALL`` is
5238 not the final list of packages that are actually installed. This
5239 variable is internal to the image construction code. Consequently, in
5240 general, you should use the
5241 :term:`IMAGE_INSTALL` variable to specify
5242 packages for installation. The exception to this is when working with
Andrew Geissler09209ee2020-12-13 08:44:15 -06005243 the :ref:`core-image-minimal-initramfs <ref-manual/images:images>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005244 image. When working with an initial RAM filesystem (initramfs) image,
5245 use the ``PACKAGE_INSTALL`` variable. For information on creating an
Andrew Geissler09209ee2020-12-13 08:44:15 -06005246 initramfs, see the ":ref:`dev-manual/common-tasks:building an initial ram filesystem (initramfs) image`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005247 in the Yocto Project Development Tasks Manual.
5248
Andrew Geisslerf0343792020-11-18 10:42:21 -06005249 :term:`PACKAGE_INSTALL_ATTEMPTONLY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005250 Specifies a list of packages the OpenEmbedded build system attempts
5251 to install when creating an image. If a listed package fails to
5252 install, the build system does not generate an error. This variable
5253 is generally not user-defined.
5254
Andrew Geisslerf0343792020-11-18 10:42:21 -06005255 :term:`PACKAGE_PREPROCESS_FUNCS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005256 Specifies a list of functions run to pre-process the
5257 :term:`PKGD` directory prior to splitting the files out
5258 to individual packages.
5259
Andrew Geisslerf0343792020-11-18 10:42:21 -06005260 :term:`PACKAGE_WRITE_DEPS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005261 Specifies a list of dependencies for post-installation and
5262 pre-installation scripts on native/cross tools. If your
5263 post-installation or pre-installation script can execute at rootfs
5264 creation time rather than on the target but depends on a native tool
5265 in order to execute, you need to list the tools in
5266 ``PACKAGE_WRITE_DEPS``.
5267
5268 For information on running post-installation scripts, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005269 ":ref:`dev-manual/common-tasks:post-installation scripts`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005270 section in the Yocto Project Development Tasks Manual.
5271
Andrew Geisslerf0343792020-11-18 10:42:21 -06005272 :term:`PACKAGECONFIG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005273 This variable provides a means of enabling or disabling features of a
5274 recipe on a per-recipe basis. ``PACKAGECONFIG`` blocks are defined in
5275 recipes when you specify features and then arguments that define
5276 feature behaviors. Here is the basic block structure (broken over
5277 multiple lines for readability):
5278 ::
5279
5280 PACKAGECONFIG ??= "f1 f2 f3 ..."
5281 PACKAGECONFIG[f1] = "\
5282 --with-f1, \
5283 --without-f1, \
5284 build-deps-for-f1, \
5285 runtime-deps-for-f1, \
5286 runtime-recommends-for-f1, \
5287 packageconfig-conflicts-for-f1"
5288 PACKAGECONFIG[f2] = "\
5289 ... and so on and so on ...
5290
5291 The ``PACKAGECONFIG`` variable itself specifies a space-separated
5292 list of the features to enable. Following the features, you can
5293 determine the behavior of each feature by providing up to six
5294 order-dependent arguments, which are separated by commas. You can
5295 omit any argument you like but must retain the separating commas. The
5296 order is important and specifies the following:
5297
5298 1. Extra arguments that should be added to the configure script
5299 argument list (:term:`EXTRA_OECONF` or
5300 :term:`PACKAGECONFIG_CONFARGS`) if
5301 the feature is enabled.
5302
5303 2. Extra arguments that should be added to ``EXTRA_OECONF`` or
5304 ``PACKAGECONFIG_CONFARGS`` if the feature is disabled.
5305
5306 3. Additional build dependencies (:term:`DEPENDS`)
5307 that should be added if the feature is enabled.
5308
5309 4. Additional runtime dependencies (:term:`RDEPENDS`)
5310 that should be added if the feature is enabled.
5311
5312 5. Additional runtime recommendations
5313 (:term:`RRECOMMENDS`) that should be added if
5314 the feature is enabled.
5315
5316 6. Any conflicting (that is, mutually exclusive) ``PACKAGECONFIG``
5317 settings for this feature.
5318
5319 Consider the following ``PACKAGECONFIG`` block taken from the
5320 ``librsvg`` recipe. In this example the feature is ``gtk``, which has
5321 three arguments that determine the feature's behavior.
5322 ::
5323
5324 PACKAGECONFIG[gtk] = "--with-gtk3,--without-gtk3,gtk+3"
5325
5326 The
5327 ``--with-gtk3`` and ``gtk+3`` arguments apply only if the feature is
5328 enabled. In this case, ``--with-gtk3`` is added to the configure
5329 script argument list and ``gtk+3`` is added to ``DEPENDS``. On the
5330 other hand, if the feature is disabled say through a ``.bbappend``
5331 file in another layer, then the second argument ``--without-gtk3`` is
5332 added to the configure script instead.
5333
5334 The basic ``PACKAGECONFIG`` structure previously described holds true
5335 regardless of whether you are creating a block or changing a block.
5336 When creating a block, use the structure inside your recipe.
5337
5338 If you want to change an existing ``PACKAGECONFIG`` block, you can do
5339 so one of two ways:
5340
5341 - *Append file:* Create an append file named
5342 recipename\ ``.bbappend`` in your layer and override the value of
5343 ``PACKAGECONFIG``. You can either completely override the
5344 variable:
5345 ::
5346
5347 PACKAGECONFIG = "f4 f5"
5348
5349 Or, you can just append the variable:
5350 ::
5351
5352 PACKAGECONFIG_append = " f4"
5353
5354 - *Configuration file:* This method is identical to changing the
5355 block through an append file except you edit your ``local.conf``
5356 or ``mydistro.conf`` file. As with append files previously
5357 described, you can either completely override the variable:
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005358 ::
5359
5360 PACKAGECONFIG_pn-recipename = "f4 f5"
5361
5362 Or, you can just amend the variable:
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005363 ::
5364
5365 PACKAGECONFIG_append_pn-recipename = " f4"
5366
Andrew Geisslerf0343792020-11-18 10:42:21 -06005367 :term:`PACKAGECONFIG_CONFARGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005368 A space-separated list of configuration options generated from the
5369 :term:`PACKAGECONFIG` setting.
5370
5371 Classes such as :ref:`autotools <ref-classes-autotools>` and
5372 :ref:`cmake <ref-classes-cmake>` use ``PACKAGECONFIG_CONFARGS`` to
5373 pass ``PACKAGECONFIG`` options to ``configure`` and ``cmake``,
5374 respectively. If you are using ``PACKAGECONFIG`` but not a class that
5375 handles the ``do_configure`` task, then you need to use
5376 ``PACKAGECONFIG_CONFARGS`` appropriately.
5377
Andrew Geisslerf0343792020-11-18 10:42:21 -06005378 :term:`PACKAGEGROUP_DISABLE_COMPLEMENTARY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005379 For recipes inheriting the
5380 :ref:`packagegroup <ref-classes-packagegroup>` class, setting
5381 ``PACKAGEGROUP_DISABLE_COMPLEMENTARY`` to "1" specifies that the
5382 normal complementary packages (i.e. ``-dev``, ``-dbg``, and so forth)
5383 should not be automatically created by the ``packagegroup`` recipe,
5384 which is the default behavior.
5385
Andrew Geisslerf0343792020-11-18 10:42:21 -06005386 :term:`PACKAGES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005387 The list of packages the recipe creates. The default value is the
5388 following:
5389 ::
5390
5391 ${PN}-dbg ${PN}-staticdev ${PN}-dev ${PN}-doc ${PN}-locale ${PACKAGE_BEFORE_PN} ${PN}
5392
5393 During packaging, the :ref:`ref-tasks-package` task
5394 goes through ``PACKAGES`` and uses the :term:`FILES`
5395 variable corresponding to each package to assign files to the
5396 package. If a file matches the ``FILES`` variable for more than one
5397 package in ``PACKAGES``, it will be assigned to the earliest
5398 (leftmost) package.
5399
5400 Packages in the variable's list that are empty (i.e. where none of
5401 the patterns in ``FILES_``\ pkg match any files installed by the
5402 :ref:`ref-tasks-install` task) are not generated,
5403 unless generation is forced through the
5404 :term:`ALLOW_EMPTY` variable.
5405
Andrew Geisslerf0343792020-11-18 10:42:21 -06005406 :term:`PACKAGES_DYNAMIC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005407 A promise that your recipe satisfies runtime dependencies for
5408 optional modules that are found in other recipes.
5409 ``PACKAGES_DYNAMIC`` does not actually satisfy the dependencies, it
5410 only states that they should be satisfied. For example, if a hard,
5411 runtime dependency (:term:`RDEPENDS`) of another
5412 package is satisfied at build time through the ``PACKAGES_DYNAMIC``
5413 variable, but a package with the module name is never actually
5414 produced, then the other package will be broken. Thus, if you attempt
5415 to include that package in an image, you will get a dependency
5416 failure from the packaging system during the
5417 :ref:`ref-tasks-rootfs` task.
5418
5419 Typically, if there is a chance that such a situation can occur and
5420 the package that is not created is valid without the dependency being
5421 satisfied, then you should use :term:`RRECOMMENDS`
5422 (a soft runtime dependency) instead of ``RDEPENDS``.
5423
5424 For an example of how to use the ``PACKAGES_DYNAMIC`` variable when
5425 you are splitting packages, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005426 ":ref:`dev-manual/common-tasks:handling optional module packaging`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005427 section in the Yocto Project Development Tasks Manual.
5428
Andrew Geisslerf0343792020-11-18 10:42:21 -06005429 :term:`PACKAGESPLITFUNCS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005430 Specifies a list of functions run to perform additional splitting of
5431 files into individual packages. Recipes can either prepend to this
5432 variable or prepend to the ``populate_packages`` function in order to
5433 perform additional package splitting. In either case, the function
5434 should set :term:`PACKAGES`,
5435 :term:`FILES`, :term:`RDEPENDS` and
5436 other packaging variables appropriately in order to perform the
5437 desired splitting.
5438
Andrew Geisslerf0343792020-11-18 10:42:21 -06005439 :term:`PARALLEL_MAKE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005440 Extra options passed to the ``make`` command during the
5441 :ref:`ref-tasks-compile` task in order to specify
5442 parallel compilation on the local build host. This variable is
5443 usually in the form "-j x", where x represents the maximum number of
5444 parallel threads ``make`` can run.
5445
5446 .. note::
5447
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005448 In order for ``PARALLEL_MAKE`` to be effective, ``make`` must be
5449 called with ``${``\ :term:`EXTRA_OEMAKE`\ ``}``. An easy way to ensure
5450 this is to use the ``oe_runmake`` function.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005451
5452 By default, the OpenEmbedded build system automatically sets this
5453 variable to be equal to the number of cores the build system uses.
5454
5455 .. note::
5456
5457 If the software being built experiences dependency issues during
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005458 the ``do_compile`` task that result in race conditions, you can clear
5459 the ``PARALLEL_MAKE`` variable within the recipe as a workaround. For
5460 information on addressing race conditions, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005461 ":ref:`dev-manual/common-tasks:debugging parallel make races`"
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005462 section in the Yocto Project Development Tasks Manual.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005463
5464 For single socket systems (i.e. one CPU), you should not have to
5465 override this variable to gain optimal parallelism during builds.
5466 However, if you have very large systems that employ multiple physical
5467 CPUs, you might want to make sure the ``PARALLEL_MAKE`` variable is
5468 not set higher than "-j 20".
5469
5470 For more information on speeding up builds, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005471 ":ref:`dev-manual/common-tasks:speeding up a build`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005472 section in the Yocto Project Development Tasks Manual.
5473
Andrew Geisslerf0343792020-11-18 10:42:21 -06005474 :term:`PARALLEL_MAKEINST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005475 Extra options passed to the ``make install`` command during the
5476 :ref:`ref-tasks-install` task in order to specify
5477 parallel installation. This variable defaults to the value of
5478 :term:`PARALLEL_MAKE`.
5479
5480 .. note::
5481
5482 In order for ``PARALLEL_MAKEINST`` to be effective, ``make`` must
5483 be called with
5484 ``${``\ :term:`EXTRA_OEMAKE`\ ``}``. An easy
5485 way to ensure this is to use the ``oe_runmake`` function.
5486
5487 If the software being built experiences dependency issues during
5488 the ``do_install`` task that result in race conditions, you can
5489 clear the ``PARALLEL_MAKEINST`` variable within the recipe as a
5490 workaround. For information on addressing race conditions, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005491 ":ref:`dev-manual/common-tasks:debugging parallel make races`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005492 section in the Yocto Project Development Tasks Manual.
5493
Andrew Geisslerf0343792020-11-18 10:42:21 -06005494 :term:`PATCHRESOLVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005495 Determines the action to take when a patch fails. You can set this
5496 variable to one of two values: "noop" and "user".
5497
5498 The default value of "noop" causes the build to simply fail when the
5499 OpenEmbedded build system cannot successfully apply a patch. Setting
5500 the value to "user" causes the build system to launch a shell and
5501 places you in the right location so that you can manually resolve the
5502 conflicts.
5503
5504 Set this variable in your ``local.conf`` file.
5505
Andrew Geisslerf0343792020-11-18 10:42:21 -06005506 :term:`PATCHTOOL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005507 Specifies the utility used to apply patches for a recipe during the
5508 :ref:`ref-tasks-patch` task. You can specify one of
5509 three utilities: "patch", "quilt", or "git". The default utility used
5510 is "quilt" except for the quilt-native recipe itself. Because the
5511 quilt tool is not available at the time quilt-native is being
5512 patched, it uses "patch".
5513
5514 If you wish to use an alternative patching tool, set the variable in
5515 the recipe using one of the following:
5516 ::
5517
5518 PATCHTOOL = "patch"
5519 PATCHTOOL = "quilt"
5520 PATCHTOOL = "git"
5521
Andrew Geisslerf0343792020-11-18 10:42:21 -06005522 :term:`PE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005523 The epoch of the recipe. By default, this variable is unset. The
5524 variable is used to make upgrades possible when the versioning scheme
5525 changes in some backwards incompatible way.
5526
5527 ``PE`` is the default value of the :term:`PKGE` variable.
5528
Andrew Geisslerf0343792020-11-18 10:42:21 -06005529 :term:`PF`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005530 Specifies the recipe or package name and includes all version and
5531 revision numbers (i.e. ``glibc-2.13-r20+svnr15508/`` and
5532 ``bash-4.2-r1/``). This variable is comprised of the following:
5533 ${:term:`PN`}-${:term:`EXTENDPE`}${:term:`PV`}-${:term:`PR`}
5534
Andrew Geisslerf0343792020-11-18 10:42:21 -06005535 :term:`PIXBUF_PACKAGES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005536 When inheriting the :ref:`pixbufcache <ref-classes-pixbufcache>`
5537 class, this variable identifies packages that contain the pixbuf
5538 loaders used with ``gdk-pixbuf``. By default, the ``pixbufcache``
5539 class assumes that the loaders are in the recipe's main package (i.e.
5540 ``${``\ :term:`PN`\ ``}``). Use this variable if the
5541 loaders you need are in a package other than that main package.
5542
Andrew Geisslerf0343792020-11-18 10:42:21 -06005543 :term:`PKG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005544 The name of the resulting package created by the OpenEmbedded build
5545 system.
5546
5547 .. note::
5548
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005549 When using the ``PKG`` variable, you must use a package name override.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005550
5551 For example, when the :ref:`debian <ref-classes-debian>` class
5552 renames the output package, it does so by setting
5553 ``PKG_packagename``.
5554
Andrew Geisslerf0343792020-11-18 10:42:21 -06005555 :term:`PKG_CONFIG_PATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005556 The path to ``pkg-config`` files for the current build context.
5557 ``pkg-config`` reads this variable from the environment.
5558
Andrew Geisslerf0343792020-11-18 10:42:21 -06005559 :term:`PKGD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005560 Points to the destination directory for files to be packaged before
5561 they are split into individual packages. This directory defaults to
5562 the following:
5563 ::
5564
5565 ${WORKDIR}/package
5566
5567 Do not change this default.
5568
Andrew Geisslerf0343792020-11-18 10:42:21 -06005569 :term:`PKGDATA_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005570 Points to a shared, global-state directory that holds data generated
5571 during the packaging process. During the packaging process, the
5572 :ref:`ref-tasks-packagedata` task packages data
5573 for each recipe and installs it into this temporary, shared area.
5574 This directory defaults to the following, which you should not
5575 change:
5576 ::
5577
5578 ${STAGING_DIR_HOST}/pkgdata
5579
5580 For examples of how this data is used, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005581 ":ref:`overview-manual/concepts:automatically added runtime dependencies`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005582 section in the Yocto Project Overview and Concepts Manual and the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005583 ":ref:`dev-manual/common-tasks:viewing package information with \`\`oe-pkgdata-util\`\``"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005584 section in the Yocto Project Development Tasks Manual. For more
5585 information on the shared, global-state directory, see
5586 :term:`STAGING_DIR_HOST`.
5587
Andrew Geisslerf0343792020-11-18 10:42:21 -06005588 :term:`PKGDEST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005589 Points to the parent directory for files to be packaged after they
5590 have been split into individual packages. This directory defaults to
5591 the following:
5592 ::
5593
5594 ${WORKDIR}/packages-split
5595
5596 Under this directory, the build system creates directories for each
5597 package specified in :term:`PACKAGES`. Do not change
5598 this default.
5599
Andrew Geisslerf0343792020-11-18 10:42:21 -06005600 :term:`PKGDESTWORK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005601 Points to a temporary work area where the
5602 :ref:`ref-tasks-package` task saves package metadata.
5603 The ``PKGDESTWORK`` location defaults to the following:
5604 ::
5605
5606 ${WORKDIR}/pkgdata
5607
5608 Do not change this default.
5609
5610 The :ref:`ref-tasks-packagedata` task copies the
5611 package metadata from ``PKGDESTWORK`` to
5612 :term:`PKGDATA_DIR` to make it available globally.
5613
Andrew Geisslerf0343792020-11-18 10:42:21 -06005614 :term:`PKGE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005615 The epoch of the package(s) built by the recipe. By default, ``PKGE``
5616 is set to :term:`PE`.
5617
Andrew Geisslerf0343792020-11-18 10:42:21 -06005618 :term:`PKGR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005619 The revision of the package(s) built by the recipe. By default,
5620 ``PKGR`` is set to :term:`PR`.
5621
Andrew Geisslerf0343792020-11-18 10:42:21 -06005622 :term:`PKGV`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005623 The version of the package(s) built by the recipe. By default,
5624 ``PKGV`` is set to :term:`PV`.
5625
Andrew Geisslerf0343792020-11-18 10:42:21 -06005626 :term:`PN`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005627 This variable can have two separate functions depending on the
5628 context: a recipe name or a resulting package name.
5629
5630 ``PN`` refers to a recipe name in the context of a file used by the
5631 OpenEmbedded build system as input to create a package. The name is
5632 normally extracted from the recipe file name. For example, if the
5633 recipe is named ``expat_2.0.1.bb``, then the default value of ``PN``
5634 will be "expat".
5635
5636 The variable refers to a package name in the context of a file
5637 created or produced by the OpenEmbedded build system.
5638
5639 If applicable, the ``PN`` variable also contains any special suffix
5640 or prefix. For example, using ``bash`` to build packages for the
5641 native machine, ``PN`` is ``bash-native``. Using ``bash`` to build
5642 packages for the target and for Multilib, ``PN`` would be ``bash``
5643 and ``lib64-bash``, respectively.
5644
Andrew Geisslerf0343792020-11-18 10:42:21 -06005645 :term:`PNBLACKLIST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005646 Lists recipes you do not want the OpenEmbedded build system to build.
5647 This variable works in conjunction with the
5648 :ref:`blacklist <ref-classes-blacklist>` class, which is inherited
5649 globally.
5650
5651 To prevent a recipe from being built, use the ``PNBLACKLIST``
5652 variable in your ``local.conf`` file. Here is an example that
5653 prevents ``myrecipe`` from being built:
5654 ::
5655
5656 PNBLACKLIST[myrecipe] = "Not supported by our organization."
5657
Andrew Geisslerf0343792020-11-18 10:42:21 -06005658 :term:`POPULATE_SDK_POST_HOST_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005659 Specifies a list of functions to call once the OpenEmbedded build
5660 system has created the host part of the SDK. You can specify
5661 functions separated by semicolons:
5662 ::
5663
5664 POPULATE_SDK_POST_HOST_COMMAND += "function; ... "
5665
5666 If you need to pass the SDK path to a command within a function, you
5667 can use ``${SDK_DIR}``, which points to the parent directory used by
5668 the OpenEmbedded build system when creating SDK output. See the
5669 :term:`SDK_DIR` variable for more information.
5670
Andrew Geisslerf0343792020-11-18 10:42:21 -06005671 :term:`POPULATE_SDK_POST_TARGET_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005672 Specifies a list of functions to call once the OpenEmbedded build
5673 system has created the target part of the SDK. You can specify
5674 functions separated by semicolons:
5675 ::
5676
5677 POPULATE_SDK_POST_TARGET_COMMAND += "function; ... "
5678
5679 If you need to pass the SDK path to a command within a function, you
5680 can use ``${SDK_DIR}``, which points to the parent directory used by
5681 the OpenEmbedded build system when creating SDK output. See the
5682 :term:`SDK_DIR` variable for more information.
5683
Andrew Geisslerf0343792020-11-18 10:42:21 -06005684 :term:`PR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005685 The revision of the recipe. The default value for this variable is
5686 "r0". Subsequent revisions of the recipe conventionally have the
5687 values "r1", "r2", and so forth. When :term:`PV` increases,
5688 ``PR`` is conventionally reset to "r0".
5689
5690 .. note::
5691
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005692 The OpenEmbedded build system does not need the aid of ``PR``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005693 to know when to rebuild a recipe. The build system uses the task
Andrew Geissler09209ee2020-12-13 08:44:15 -06005694 :ref:`input checksums <overview-manual/concepts:checksums (signatures)>` along with the
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005695 :ref:`stamp <structure-build-tmp-stamps>` and
Andrew Geissler09209ee2020-12-13 08:44:15 -06005696 :ref:`overview-manual/concepts:shared state cache`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005697 mechanisms.
5698
5699 The ``PR`` variable primarily becomes significant when a package
5700 manager dynamically installs packages on an already built image. In
5701 this case, ``PR``, which is the default value of
5702 :term:`PKGR`, helps the package manager distinguish which
5703 package is the most recent one in cases where many packages have the
5704 same ``PV`` (i.e. ``PKGV``). A component having many packages with
5705 the same ``PV`` usually means that the packages all install the same
5706 upstream version, but with later (``PR``) version packages including
5707 packaging fixes.
5708
5709 .. note::
5710
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005711 ``PR`` does not need to be increased for changes that do not change the
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005712 package contents or metadata.
5713
5714 Because manually managing ``PR`` can be cumbersome and error-prone,
5715 an automated solution exists. See the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005716 ":ref:`dev-manual/common-tasks:working with a pr service`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005717 in the Yocto Project Development Tasks Manual for more information.
5718
Andrew Geisslerf0343792020-11-18 10:42:21 -06005719 :term:`PREFERRED_PROVIDER`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005720 If multiple recipes provide the same item, this variable determines
5721 which recipe is preferred and thus provides the item (i.e. the
5722 preferred provider). You should always suffix this variable with the
5723 name of the provided item. And, you should define the variable using
5724 the preferred recipe's name (:term:`PN`). Here is a common
5725 example:
5726 ::
5727
5728 PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto"
5729
5730 In the previous example, multiple recipes are providing "virtual/kernel".
5731 The ``PREFERRED_PROVIDER`` variable is set with the name (``PN``) of
5732 the recipe you prefer to provide "virtual/kernel".
5733
5734 Following are more examples:
5735 ::
5736
5737 PREFERRED_PROVIDER_virtual/xserver = "xserver-xf86"
5738 PREFERRED_PROVIDER_virtual/libgl ?= "mesa"
5739
5740 For more
Andrew Geissler09209ee2020-12-13 08:44:15 -06005741 information, see the ":ref:`dev-manual/common-tasks:using virtual providers`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005742 section in the Yocto Project Development Tasks Manual.
5743
5744 .. note::
5745
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005746 If you use a ``virtual/\*`` item with ``PREFERRED_PROVIDER``, then any
5747 recipe that :term:`PROVIDES` that item but is not selected (defined)
5748 by ``PREFERRED_PROVIDER`` is prevented from building, which is usually
5749 desirable since this mechanism is designed to select between mutually
5750 exclusive alternative providers.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005751
Andrew Geisslerf0343792020-11-18 10:42:21 -06005752 :term:`PREFERRED_VERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005753 If multiple versions of recipes exist, this variable determines which
5754 version is given preference. You must always suffix the variable with
5755 the :term:`PN` you want to select, and you should set the
5756 :term:`PV` accordingly for precedence.
5757
5758 The ``PREFERRED_VERSION`` variable supports limited wildcard use
5759 through the "``%``" character. You can use the character to match any
5760 number of characters, which can be useful when specifying versions
5761 that contain long revision numbers that potentially change. Here are
5762 two examples:
5763 ::
5764
5765 PREFERRED_VERSION_python = "3.4.0"
5766 PREFERRED_VERSION_linux-yocto = "5.0%"
5767
5768 .. note::
5769
5770 The use of the "%" character is limited in that it only works at the end of the
5771 string. You cannot use the wildcard character in any other
5772 location of the string.
5773
5774 The specified version is matched against :term:`PV`, which
5775 does not necessarily match the version part of the recipe's filename.
5776 For example, consider two recipes ``foo_1.2.bb`` and ``foo_git.bb``
5777 where ``foo_git.bb`` contains the following assignment:
5778 ::
5779
5780 PV = "1.1+git${SRCPV}"
5781
5782 In this case, the correct way to select
5783 ``foo_git.bb`` is by using an assignment such as the following:
5784 ::
5785
5786 PREFERRED_VERSION_foo = "1.1+git%"
5787
5788 Compare that previous example
5789 against the following incorrect example, which does not work:
5790 ::
5791
5792 PREFERRED_VERSION_foo = "git"
5793
5794 Sometimes the ``PREFERRED_VERSION`` variable can be set by
5795 configuration files in a way that is hard to change. You can use
5796 :term:`OVERRIDES` to set a machine-specific
5797 override. Here is an example:
5798 ::
5799
5800 PREFERRED_VERSION_linux-yocto_qemux86 = "5.0%"
5801
5802 Although not recommended, worst case, you can also use the
5803 "forcevariable" override, which is the strongest override possible.
5804 Here is an example:
5805 ::
5806
5807 PREFERRED_VERSION_linux-yocto_forcevariable = "5.0%"
5808
5809 .. note::
5810
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005811 The ``\_forcevariable`` override is not handled specially. This override
5812 only works because the default value of ``OVERRIDES`` includes "forcevariable".
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005813
Andrew Geisslerf0343792020-11-18 10:42:21 -06005814 :term:`PREMIRRORS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005815 Specifies additional paths from which the OpenEmbedded build system
5816 gets source code. When the build system searches for source code, it
5817 first tries the local download directory. If that location fails, the
5818 build system tries locations defined by ``PREMIRRORS``, the upstream
5819 source, and then locations specified by
5820 :term:`MIRRORS` in that order.
5821
5822 Assuming your distribution (:term:`DISTRO`) is "poky",
5823 the default value for ``PREMIRRORS`` is defined in the
5824 ``conf/distro/poky.conf`` file in the ``meta-poky`` Git repository.
5825
5826 Typically, you could add a specific server for the build system to
5827 attempt before any others by adding something like the following to
5828 the ``local.conf`` configuration file in the
5829 :term:`Build Directory`:
5830 ::
5831
5832 PREMIRRORS_prepend = "\
5833 git://.*/.* http://www.yoctoproject.org/sources/ \n \
5834 ftp://.*/.* http://www.yoctoproject.org/sources/ \n \
5835 http://.*/.* http://www.yoctoproject.org/sources/ \n \
5836 https://.*/.* http://www.yoctoproject.org/sources/ \n"
5837
5838 These changes cause the
5839 build system to intercept Git, FTP, HTTP, and HTTPS requests and
5840 direct them to the ``http://`` sources mirror. You can use
5841 ``file://`` URLs to point to local directories or network shares as
5842 well.
5843
Andrew Geisslerf0343792020-11-18 10:42:21 -06005844 :term:`PRIORITY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005845 Indicates the importance of a package.
5846
5847 ``PRIORITY`` is considered to be part of the distribution policy
5848 because the importance of any given recipe depends on the purpose for
5849 which the distribution is being produced. Thus, ``PRIORITY`` is not
5850 normally set within recipes.
5851
5852 You can set ``PRIORITY`` to "required", "standard", "extra", and
5853 "optional", which is the default.
5854
Andrew Geisslerf0343792020-11-18 10:42:21 -06005855 :term:`PRIVATE_LIBS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005856 Specifies libraries installed within a recipe that should be ignored
5857 by the OpenEmbedded build system's shared library resolver. This
5858 variable is typically used when software being built by a recipe has
5859 its own private versions of a library normally provided by another
5860 recipe. In this case, you would not want the package containing the
5861 private libraries to be set as a dependency on other unrelated
5862 packages that should instead depend on the package providing the
5863 standard version of the library.
5864
5865 Libraries specified in this variable should be specified by their
5866 file name. For example, from the Firefox recipe in meta-browser:
5867 ::
5868
5869 PRIVATE_LIBS = "libmozjs.so \
5870 libxpcom.so \
5871 libnspr4.so \
5872 libxul.so \
5873 libmozalloc.so \
5874 libplc4.so \
5875 libplds4.so"
5876
5877 For more information, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06005878 ":ref:`overview-manual/concepts:automatically added runtime dependencies`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005879 section in the Yocto Project Overview and Concepts Manual.
5880
Andrew Geisslerf0343792020-11-18 10:42:21 -06005881 :term:`PROVIDES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005882 A list of aliases by which a particular recipe can be known. By
5883 default, a recipe's own ``PN`` is implicitly already in its
5884 ``PROVIDES`` list and therefore does not need to mention that it
5885 provides itself. If a recipe uses ``PROVIDES``, the additional
5886 aliases are synonyms for the recipe and can be useful for satisfying
5887 dependencies of other recipes during the build as specified by
5888 ``DEPENDS``.
5889
5890 Consider the following example ``PROVIDES`` statement from the recipe
5891 file ``eudev_3.2.9.bb``:
5892 ::
5893
5894 PROVIDES = "udev"
5895
5896 The ``PROVIDES`` statement
5897 results in the "eudev" recipe also being available as simply "udev".
5898
5899 .. note::
5900
5901 Given that a recipe's own recipe name is already implicitly in its
Andrew Geissler4c19ea12020-10-27 13:52:24 -05005902 own PROVIDES list, it is unnecessary to add aliases with the "+=" operator;
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005903 using a simple assignment will be sufficient. In other words,
5904 while you could write:
5905 ::
5906
5907 PROVIDES += "udev"
5908
5909
5910 in the above, the "+=" is overkill and unnecessary.
5911
5912 In addition to providing recipes under alternate names, the
5913 ``PROVIDES`` mechanism is also used to implement virtual targets. A
5914 virtual target is a name that corresponds to some particular
5915 functionality (e.g. a Linux kernel). Recipes that provide the
5916 functionality in question list the virtual target in ``PROVIDES``.
5917 Recipes that depend on the functionality in question can include the
5918 virtual target in ``DEPENDS`` to leave the choice of provider open.
5919
5920 Conventionally, virtual targets have names on the form
5921 "virtual/function" (e.g. "virtual/kernel"). The slash is simply part
5922 of the name and has no syntactical significance.
5923
5924 The :term:`PREFERRED_PROVIDER` variable is
5925 used to select which particular recipe provides a virtual target.
5926
5927 .. note::
5928
5929 A corresponding mechanism for virtual runtime dependencies
5930 (packages) exists. However, the mechanism does not depend on any
5931 special functionality beyond ordinary variable assignments. For
5932 example, ``VIRTUAL-RUNTIME_dev_manager`` refers to the package of
5933 the component that manages the ``/dev`` directory.
5934
5935 Setting the "preferred provider" for runtime dependencies is as
5936 simple as using the following assignment in a configuration file:
5937 ::
5938
5939 VIRTUAL-RUNTIME_dev_manager = "udev"
5940
5941
Andrew Geisslerf0343792020-11-18 10:42:21 -06005942 :term:`PRSERV_HOST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005943 The network based :term:`PR` service host and port.
5944
5945 The ``conf/local.conf.sample.extended`` configuration file in the
5946 :term:`Source Directory` shows how the
5947 ``PRSERV_HOST`` variable is set:
5948 ::
5949
5950 PRSERV_HOST = "localhost:0"
5951
5952 You must
5953 set the variable if you want to automatically start a local :ref:`PR
Andrew Geissler09209ee2020-12-13 08:44:15 -06005954 service <dev-manual/common-tasks:working with a pr service>`. You can
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005955 set ``PRSERV_HOST`` to other values to use a remote PR service.
5956
Andrew Geissler6ce62a22020-11-30 19:58:47 -06005957
5958 :term:`PSEUDO_IGNORE_PATHS`
5959 A comma-separated (without spaces) list of path prefixes that should be ignored
5960 by pseudo when monitoring and recording file operations, in order to avoid
5961 problems with files being written to outside of the pseudo context and
5962 reduce pseudo's overhead. A path is ignored if it matches any prefix in the list
5963 and can include partial directory (or file) names.
5964
5965
Andrew Geisslerf0343792020-11-18 10:42:21 -06005966 :term:`PTEST_ENABLED`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005967 Specifies whether or not :ref:`Package
Andrew Geissler09209ee2020-12-13 08:44:15 -06005968 Test <dev-manual/common-tasks:testing packages with ptest>` (ptest)
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005969 functionality is enabled when building a recipe. You should not set
5970 this variable directly. Enabling and disabling building Package Tests
5971 at build time should be done by adding "ptest" to (or removing it
5972 from) :term:`DISTRO_FEATURES`.
5973
Andrew Geisslerf0343792020-11-18 10:42:21 -06005974 :term:`PV`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005975 The version of the recipe. The version is normally extracted from the
5976 recipe filename. For example, if the recipe is named
5977 ``expat_2.0.1.bb``, then the default value of ``PV`` will be "2.0.1".
5978 ``PV`` is generally not overridden within a recipe unless it is
5979 building an unstable (i.e. development) version from a source code
5980 repository (e.g. Git or Subversion).
5981
5982 ``PV`` is the default value of the :term:`PKGV` variable.
5983
Andrew Geisslerf0343792020-11-18 10:42:21 -06005984 :term:`PYTHON_ABI`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05005985 When used by recipes that inherit the
5986 :ref:`distutils3 <ref-classes-distutils3>`,
5987 :ref:`setuptools3 <ref-classes-setuptools3>`,
5988 :ref:`distutils <ref-classes-distutils>`, or
5989 :ref:`setuptools <ref-classes-setuptools>` classes, denotes the
5990 Application Binary Interface (ABI) currently in use for Python. By
5991 default, the ABI is "m". You do not have to set this variable as the
5992 OpenEmbedded build system sets it for you.
5993
5994 The OpenEmbedded build system uses the ABI to construct directory
5995 names used when installing the Python headers and libraries in
5996 sysroot (e.g. ``.../python3.3m/...``).
5997
5998 Recipes that inherit the ``distutils`` class during cross-builds also
5999 use this variable to locate the headers and libraries of the
6000 appropriate Python that the extension is targeting.
6001
Andrew Geisslerf0343792020-11-18 10:42:21 -06006002 :term:`PYTHON_PN`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006003 When used by recipes that inherit the
6004 `distutils3 <ref-classes-distutils3>`,
6005 :ref:`setuptools3 <ref-classes-setuptools3>`,
6006 :ref:`distutils <ref-classes-distutils>`, or
6007 :ref:`setuptools <ref-classes-setuptools>` classes, specifies the
6008 major Python version being built. For Python 3.x, ``PYTHON_PN`` would
6009 be "python3". You do not have to set this variable as the
6010 OpenEmbedded build system automatically sets it for you.
6011
6012 The variable allows recipes to use common infrastructure such as the
6013 following:
6014 ::
6015
6016 DEPENDS += "${PYTHON_PN}-native"
6017
6018 In the previous example,
6019 the version of the dependency is ``PYTHON_PN``.
6020
Andrew Geisslerf0343792020-11-18 10:42:21 -06006021 :term:`RANLIB`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006022 The minimal command and arguments to run ``ranlib``.
6023
Andrew Geisslerf0343792020-11-18 10:42:21 -06006024 :term:`RCONFLICTS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006025 The list of packages that conflict with packages. Note that packages
6026 will not be installed if conflicting packages are not first removed.
6027
6028 Like all package-controlling variables, you must always use them in
6029 conjunction with a package name override. Here is an example:
6030 ::
6031
6032 RCONFLICTS_${PN} = "another_conflicting_package_name"
6033
6034 BitBake, which the OpenEmbedded build system uses, supports
6035 specifying versioned dependencies. Although the syntax varies
6036 depending on the packaging format, BitBake hides these differences
6037 from you. Here is the general syntax to specify versions with the
6038 ``RCONFLICTS`` variable:
6039 ::
6040
6041 RCONFLICTS_${PN} = "package (operator version)"
6042
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006043 For ``operator``, you can specify the following:
6044
6045 - =
6046 - <
6047 - >
6048 - <=
6049 - >=
6050
6051 For example, the following sets up a dependency on version 1.2 or
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006052 greater of the package ``foo``:
6053 ::
6054
6055 RCONFLICTS_${PN} = "foo (>= 1.2)"
6056
Andrew Geisslerf0343792020-11-18 10:42:21 -06006057 :term:`RDEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006058 Lists runtime dependencies of a package. These dependencies are other
6059 packages that must be installed in order for the package to function
6060 correctly. As an example, the following assignment declares that the
6061 package ``foo`` needs the packages ``bar`` and ``baz`` to be
6062 installed:
6063 ::
6064
6065 RDEPENDS_foo = "bar baz"
6066
6067 The most common types of package
6068 runtime dependencies are automatically detected and added. Therefore,
6069 most recipes do not need to set ``RDEPENDS``. For more information,
6070 see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06006071 ":ref:`overview-manual/concepts:automatically added runtime dependencies`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006072 section in the Yocto Project Overview and Concepts Manual.
6073
6074 The practical effect of the above ``RDEPENDS`` assignment is that
6075 ``bar`` and ``baz`` will be declared as dependencies inside the
6076 package ``foo`` when it is written out by one of the
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006077 :ref:`do_package_write_\* <ref-tasks-package_write_deb>` tasks.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006078 Exactly how this is done depends on which package format is used,
6079 which is determined by
6080 :term:`PACKAGE_CLASSES`. When the
6081 corresponding package manager installs the package, it will know to
6082 also install the packages on which it depends.
6083
6084 To ensure that the packages ``bar`` and ``baz`` get built, the
6085 previous ``RDEPENDS`` assignment also causes a task dependency to be
6086 added. This dependency is from the recipe's
6087 :ref:`ref-tasks-build` (not to be confused with
6088 :ref:`ref-tasks-compile`) task to the
6089 ``do_package_write_*`` task of the recipes that build ``bar`` and
6090 ``baz``.
6091
6092 The names of the packages you list within ``RDEPENDS`` must be the
6093 names of other packages - they cannot be recipe names. Although
6094 package names and recipe names usually match, the important point
6095 here is that you are providing package names within the ``RDEPENDS``
6096 variable. For an example of the default list of packages created from
6097 a recipe, see the :term:`PACKAGES` variable.
6098
6099 Because the ``RDEPENDS`` variable applies to packages being built,
6100 you should always use the variable in a form with an attached package
6101 name (remember that a single recipe can build multiple packages). For
6102 example, suppose you are building a development package that depends
6103 on the ``perl`` package. In this case, you would use the following
6104 ``RDEPENDS`` statement:
6105 ::
6106
6107 RDEPENDS_${PN}-dev += "perl"
6108
6109 In the example,
6110 the development package depends on the ``perl`` package. Thus, the
6111 ``RDEPENDS`` variable has the ``${PN}-dev`` package name as part of
6112 the variable.
6113
6114 .. note::
6115
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006116 ``RDEPENDS_${PN}-dev`` includes ``${``\ :term:`PN`\ ``}``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006117 by default. This default is set in the BitBake configuration file
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006118 (``meta/conf/bitbake.conf``). Be careful not to accidentally remove
6119 ``${PN}`` when modifying ``RDEPENDS_${PN}-dev``. Use the "+=" operator
6120 rather than the "=" operator.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006121
6122 The package names you use with ``RDEPENDS`` must appear as they would
6123 in the ``PACKAGES`` variable. The :term:`PKG` variable
6124 allows a different name to be used for the final package (e.g. the
6125 :ref:`debian <ref-classes-debian>` class uses this to rename
6126 packages), but this final package name cannot be used with
6127 ``RDEPENDS``, which makes sense as ``RDEPENDS`` is meant to be
6128 independent of the package format used.
6129
6130 BitBake, which the OpenEmbedded build system uses, supports
6131 specifying versioned dependencies. Although the syntax varies
6132 depending on the packaging format, BitBake hides these differences
6133 from you. Here is the general syntax to specify versions with the
6134 ``RDEPENDS`` variable:
6135 ::
6136
6137 RDEPENDS_${PN} = "package (operator version)"
6138
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006139 For ``operator``, you can specify the following:
6140
6141 - =
6142 - <
6143 - >
6144 - <=
6145 - >=
6146
6147 For version, provide the version number.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006148
6149 .. note::
6150
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006151 You can use ``EXTENDPKGV`` to provide a full package version
6152 specification.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006153
6154 For example, the following sets up a dependency on version 1.2 or
6155 greater of the package ``foo``:
6156 ::
6157
6158 RDEPENDS_${PN} = "foo (>= 1.2)"
6159
6160 For information on build-time dependencies, see the
6161 :term:`DEPENDS` variable. You can also see the
6162 ":ref:`Tasks <bitbake:bitbake-user-manual/bitbake-user-manual-metadata:tasks>`" and
6163 ":ref:`Dependencies <bitbake:bitbake-user-manual/bitbake-user-manual-execution:dependencies>`" sections in the
6164 BitBake User Manual for additional information on tasks and
6165 dependencies.
6166
Andrew Geisslerf0343792020-11-18 10:42:21 -06006167 :term:`REQUIRED_DISTRO_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006168 When inheriting the
Andrew Geissler6ce62a22020-11-30 19:58:47 -06006169 :ref:`features_check <ref-classes-features_check>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006170 class, this variable identifies distribution features that must exist
6171 in the current configuration in order for the OpenEmbedded build
6172 system to build the recipe. In other words, if the
6173 ``REQUIRED_DISTRO_FEATURES`` variable lists a feature that does not
Andrew Geissler6ce62a22020-11-30 19:58:47 -06006174 appear in ``DISTRO_FEATURES`` within the current configuration, then
6175 the recipe will be skipped, and if the build system attempts to build
6176 the recipe then an error will be triggered.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006177
Andrew Geisslerf0343792020-11-18 10:42:21 -06006178 :term:`RM_WORK_EXCLUDE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006179 With ``rm_work`` enabled, this variable specifies a list of recipes
6180 whose work directories should not be removed. See the
6181 ":ref:`rm_work.bbclass <ref-classes-rm-work>`" section for more
6182 details.
6183
Andrew Geisslerf0343792020-11-18 10:42:21 -06006184 :term:`ROOT_HOME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006185 Defines the root home directory. By default, this directory is set as
6186 follows in the BitBake configuration file:
6187 ::
6188
6189 ROOT_HOME ??= "/home/root"
6190
6191 .. note::
6192
6193 This default value is likely used because some embedded solutions
6194 prefer to have a read-only root filesystem and prefer to keep
6195 writeable data in one place.
6196
6197 You can override the default by setting the variable in any layer or
6198 in the ``local.conf`` file. Because the default is set using a "weak"
6199 assignment (i.e. "??="), you can use either of the following forms to
6200 define your override:
6201 ::
6202
6203 ROOT_HOME = "/root"
6204 ROOT_HOME ?= "/root"
6205
6206 These
6207 override examples use ``/root``, which is probably the most commonly
6208 used override.
6209
Andrew Geisslerf0343792020-11-18 10:42:21 -06006210 :term:`ROOTFS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006211 Indicates a filesystem image to include as the root filesystem.
6212
6213 The ``ROOTFS`` variable is an optional variable used with the
6214 :ref:`image-live <ref-classes-image-live>` class.
6215
Andrew Geisslerf0343792020-11-18 10:42:21 -06006216 :term:`ROOTFS_POSTINSTALL_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006217 Specifies a list of functions to call after the OpenEmbedded build
6218 system has installed packages. You can specify functions separated by
6219 semicolons:
6220 ::
6221
6222 ROOTFS_POSTINSTALL_COMMAND += "function; ... "
6223
6224 If you need to pass the root filesystem path to a command within a
6225 function, you can use ``${IMAGE_ROOTFS}``, which points to the
6226 directory that becomes the root filesystem image. See the
6227 :term:`IMAGE_ROOTFS` variable for more
6228 information.
6229
Andrew Geisslerf0343792020-11-18 10:42:21 -06006230 :term:`ROOTFS_POSTPROCESS_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006231 Specifies a list of functions to call once the OpenEmbedded build
6232 system has created the root filesystem. You can specify functions
6233 separated by semicolons:
6234 ::
6235
6236 ROOTFS_POSTPROCESS_COMMAND += "function; ... "
6237
6238 If you need to pass the root filesystem path to a command within a
6239 function, you can use ``${IMAGE_ROOTFS}``, which points to the
6240 directory that becomes the root filesystem image. See the
6241 :term:`IMAGE_ROOTFS` variable for more
6242 information.
6243
Andrew Geisslerf0343792020-11-18 10:42:21 -06006244 :term:`ROOTFS_POSTUNINSTALL_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006245 Specifies a list of functions to call after the OpenEmbedded build
6246 system has removed unnecessary packages. When runtime package
6247 management is disabled in the image, several packages are removed
6248 including ``base-passwd``, ``shadow``, and ``update-alternatives``.
6249 You can specify functions separated by semicolons:
6250 ::
6251
6252 ROOTFS_POSTUNINSTALL_COMMAND += "function; ... "
6253
6254 If you need to pass the root filesystem path to a command within a
6255 function, you can use ``${IMAGE_ROOTFS}``, which points to the
6256 directory that becomes the root filesystem image. See the
6257 :term:`IMAGE_ROOTFS` variable for more
6258 information.
6259
Andrew Geisslerf0343792020-11-18 10:42:21 -06006260 :term:`ROOTFS_PREPROCESS_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006261 Specifies a list of functions to call before the OpenEmbedded build
6262 system has created the root filesystem. You can specify functions
6263 separated by semicolons:
6264 ::
6265
6266 ROOTFS_PREPROCESS_COMMAND += "function; ... "
6267
6268 If you need to pass the root filesystem path to a command within a
6269 function, you can use ``${IMAGE_ROOTFS}``, which points to the
6270 directory that becomes the root filesystem image. See the
6271 :term:`IMAGE_ROOTFS` variable for more
6272 information.
6273
Andrew Geisslerf0343792020-11-18 10:42:21 -06006274 :term:`RPROVIDES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006275 A list of package name aliases that a package also provides. These
6276 aliases are useful for satisfying runtime dependencies of other
6277 packages both during the build and on the target (as specified by
6278 ``RDEPENDS``).
6279
6280 .. note::
6281
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006282 A package's own name is implicitly already in its ``RPROVIDES`` list.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006283
6284 As with all package-controlling variables, you must always use the
6285 variable in conjunction with a package name override. Here is an
6286 example:
6287 ::
6288
6289 RPROVIDES_${PN} = "widget-abi-2"
6290
Andrew Geisslerf0343792020-11-18 10:42:21 -06006291 :term:`RRECOMMENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006292 A list of packages that extends the usability of a package being
6293 built. The package being built does not depend on this list of
6294 packages in order to successfully build, but rather uses them for
6295 extended usability. To specify runtime dependencies for packages, see
6296 the ``RDEPENDS`` variable.
6297
6298 The package manager will automatically install the ``RRECOMMENDS``
6299 list of packages when installing the built package. However, you can
6300 prevent listed packages from being installed by using the
6301 :term:`BAD_RECOMMENDATIONS`,
6302 :term:`NO_RECOMMENDATIONS`, and
6303 :term:`PACKAGE_EXCLUDE` variables.
6304
6305 Packages specified in ``RRECOMMENDS`` need not actually be produced.
6306 However, a recipe must exist that provides each package, either
6307 through the :term:`PACKAGES` or
6308 :term:`PACKAGES_DYNAMIC` variables or the
6309 :term:`RPROVIDES` variable, or an error will occur
6310 during the build. If such a recipe does exist and the package is not
6311 produced, the build continues without error.
6312
6313 Because the ``RRECOMMENDS`` variable applies to packages being built,
6314 you should always attach an override to the variable to specify the
6315 particular package whose usability is being extended. For example,
6316 suppose you are building a development package that is extended to
6317 support wireless functionality. In this case, you would use the
6318 following:
6319 ::
6320
6321 RRECOMMENDS_${PN}-dev += "wireless_package_name"
6322
6323 In the
6324 example, the package name (``${PN}-dev``) must appear as it would in
6325 the ``PACKAGES`` namespace before any renaming of the output package
6326 by classes such as ``debian.bbclass``.
6327
6328 BitBake, which the OpenEmbedded build system uses, supports
6329 specifying versioned recommends. Although the syntax varies depending
6330 on the packaging format, BitBake hides these differences from you.
6331 Here is the general syntax to specify versions with the
6332 ``RRECOMMENDS`` variable:
6333 ::
6334
6335 RRECOMMENDS_${PN} = "package (operator version)"
6336
6337 For ``operator``, you can specify the following:
6338
6339 - =
6340 - <
6341 - >
6342 - <=
6343 - >=
6344
6345 For example, the following sets up a recommend on version 1.2 or
6346 greater of the package ``foo``:
6347 ::
6348
6349 RRECOMMENDS_${PN} = "foo (>= 1.2)"
6350
Andrew Geisslerf0343792020-11-18 10:42:21 -06006351 :term:`RREPLACES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006352 A list of packages replaced by a package. The package manager uses
6353 this variable to determine which package should be installed to
6354 replace other package(s) during an upgrade. In order to also have the
6355 other package(s) removed at the same time, you must add the name of
6356 the other package to the ``RCONFLICTS`` variable.
6357
6358 As with all package-controlling variables, you must use this variable
6359 in conjunction with a package name override. Here is an example:
6360 ::
6361
6362 RREPLACES_${PN} = "other_package_being_replaced"
6363
6364 BitBake, which the OpenEmbedded build system uses, supports
6365 specifying versioned replacements. Although the syntax varies
6366 depending on the packaging format, BitBake hides these differences
6367 from you. Here is the general syntax to specify versions with the
6368 ``RREPLACES`` variable:
6369 ::
6370
6371 RREPLACES_${PN} = "package (operator version)"
6372
6373 For ``operator``, you can specify the following:
6374
6375 - =
6376 - <
6377 - >
6378 - <=
6379 - >=
6380
6381 For example, the following sets up a replacement using version 1.2
6382 or greater of the package ``foo``:
6383 ::
6384
6385 RREPLACES_${PN} = "foo (>= 1.2)"
6386
Andrew Geisslerf0343792020-11-18 10:42:21 -06006387 :term:`RSUGGESTS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006388 A list of additional packages that you can suggest for installation
6389 by the package manager at the time a package is installed. Not all
6390 package managers support this functionality.
6391
6392 As with all package-controlling variables, you must always use this
6393 variable in conjunction with a package name override. Here is an
6394 example:
6395 ::
6396
6397 RSUGGESTS_${PN} = "useful_package another_package"
6398
Andrew Geisslerf0343792020-11-18 10:42:21 -06006399 :term:`S`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006400 The location in the :term:`Build Directory` where
6401 unpacked recipe source code resides. By default, this directory is
6402 ``${``\ :term:`WORKDIR`\ ``}/${``\ :term:`BPN`\ ``}-${``\ :term:`PV`\ ``}``,
6403 where ``${BPN}`` is the base recipe name and ``${PV}`` is the recipe
6404 version. If the source tarball extracts the code to a directory named
6405 anything other than ``${BPN}-${PV}``, or if the source code is
6406 fetched from an SCM such as Git or Subversion, then you must set
6407 ``S`` in the recipe so that the OpenEmbedded build system knows where
6408 to find the unpacked source.
6409
6410 As an example, assume a :term:`Source Directory`
6411 top-level folder named ``poky`` and a default Build Directory at
6412 ``poky/build``. In this case, the work directory the build system
6413 uses to keep the unpacked recipe for ``db`` is the following:
6414 ::
6415
6416 poky/build/tmp/work/qemux86-poky-linux/db/5.1.19-r3/db-5.1.19
6417
6418 The unpacked source code resides in the ``db-5.1.19`` folder.
6419
6420 This next example assumes a Git repository. By default, Git
6421 repositories are cloned to ``${WORKDIR}/git`` during
6422 :ref:`ref-tasks-fetch`. Since this path is different
6423 from the default value of ``S``, you must set it specifically so the
6424 source can be located:
6425 ::
6426
6427 SRC_URI = "git://path/to/repo.git"
6428 S = "${WORKDIR}/git"
6429
Andrew Geisslerf0343792020-11-18 10:42:21 -06006430 :term:`SANITY_REQUIRED_UTILITIES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006431 Specifies a list of command-line utilities that should be checked for
6432 during the initial sanity checking process when running BitBake. If
6433 any of the utilities are not installed on the build host, then
6434 BitBake immediately exits with an error.
6435
Andrew Geisslerf0343792020-11-18 10:42:21 -06006436 :term:`SANITY_TESTED_DISTROS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006437 A list of the host distribution identifiers that the build system has
6438 been tested against. Identifiers consist of the host distributor ID
6439 followed by the release, as reported by the ``lsb_release`` tool or
6440 as read from ``/etc/lsb-release``. Separate the list items with
6441 explicit newline characters (``\n``). If ``SANITY_TESTED_DISTROS`` is
6442 not empty and the current value of
6443 :term:`NATIVELSBSTRING` does not appear in the
6444 list, then the build system reports a warning that indicates the
6445 current host distribution has not been tested as a build host.
6446
Andrew Geisslerf0343792020-11-18 10:42:21 -06006447 :term:`SDK_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006448 The target architecture for the SDK. Typically, you do not directly
6449 set this variable. Instead, use :term:`SDKMACHINE`.
6450
Andrew Geisslerf0343792020-11-18 10:42:21 -06006451 :term:`SDK_DEPLOY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006452 The directory set up and used by the
6453 :ref:`populate_sdk_base <ref-classes-populate-sdk>` class to which
6454 the SDK is deployed. The ``populate_sdk_base`` class defines
6455 ``SDK_DEPLOY`` as follows:
6456 ::
6457
6458 SDK_DEPLOY = "${TMPDIR}/deploy/sdk"
6459
Andrew Geisslerf0343792020-11-18 10:42:21 -06006460 :term:`SDK_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006461 The parent directory used by the OpenEmbedded build system when
6462 creating SDK output. The
6463 :ref:`populate_sdk_base <ref-classes-populate-sdk-*>` class defines
6464 the variable as follows:
6465 ::
6466
6467 SDK_DIR = "${WORKDIR}/sdk"
6468
6469 .. note::
6470
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006471 The ``SDK_DIR`` directory is a temporary directory as it is part of
6472 ``WORKDIR``. The final output directory is :term:`SDK_DEPLOY`.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006473
Andrew Geisslerf0343792020-11-18 10:42:21 -06006474 :term:`SDK_EXT_TYPE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006475 Controls whether or not shared state artifacts are copied into the
6476 extensible SDK. The default value of "full" copies all of the
6477 required shared state artifacts into the extensible SDK. The value
6478 "minimal" leaves these artifacts out of the SDK.
6479
6480 .. note::
6481
6482 If you set the variable to "minimal", you need to ensure
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006483 :term:`SSTATE_MIRRORS` is set in the SDK's configuration to enable the
6484 artifacts to be fetched as needed.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006485
Andrew Geisslerf0343792020-11-18 10:42:21 -06006486 :term:`SDK_HOST_MANIFEST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006487 The manifest file for the host part of the SDK. This file lists all
6488 the installed packages that make up the host part of the SDK. The
6489 file contains package information on a line-per-package basis as
6490 follows:
6491 ::
6492
6493 packagename packagearch version
6494
6495 The :ref:`populate_sdk_base <ref-classes-populate-sdk-*>` class
6496 defines the manifest file as follows:
6497 ::
6498
6499 SDK_HOST_MANIFEST = "${SDK_DEPLOY}/${TOOLCHAIN_OUTPUTNAME}.host.manifest"
6500
6501 The location is derived using the :term:`SDK_DEPLOY` and
6502 :term:`TOOLCHAIN_OUTPUTNAME` variables.
6503
Andrew Geisslerf0343792020-11-18 10:42:21 -06006504 :term:`SDK_INCLUDE_PKGDATA`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006505 When set to "1", specifies to include the packagedata for all recipes
6506 in the "world" target in the extensible SDK. Including this data
6507 allows the ``devtool search`` command to find these recipes in search
6508 results, as well as allows the ``devtool add`` command to map
6509 dependencies more effectively.
6510
6511 .. note::
6512
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006513 Enabling the ``SDK_INCLUDE_PKGDATA``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006514 variable significantly increases build time because all of world
6515 needs to be built. Enabling the variable also slightly increases
6516 the size of the extensible SDK.
6517
Andrew Geisslerf0343792020-11-18 10:42:21 -06006518 :term:`SDK_INCLUDE_TOOLCHAIN`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006519 When set to "1", specifies to include the toolchain in the extensible
6520 SDK. Including the toolchain is useful particularly when
6521 :term:`SDK_EXT_TYPE` is set to "minimal" to keep
6522 the SDK reasonably small but you still want to provide a usable
6523 toolchain. For example, suppose you want to use the toolchain from an
6524 IDE or from other tools and you do not want to perform additional
6525 steps to install the toolchain.
6526
6527 The ``SDK_INCLUDE_TOOLCHAIN`` variable defaults to "0" if
6528 ``SDK_EXT_TYPE`` is set to "minimal", and defaults to "1" if
6529 ``SDK_EXT_TYPE`` is set to "full".
6530
Andrew Geisslerf0343792020-11-18 10:42:21 -06006531 :term:`SDK_INHERIT_BLACKLIST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006532 A list of classes to remove from the :term:`INHERIT`
6533 value globally within the extensible SDK configuration. The
6534 :ref:`populate-sdk-ext <ref-classes-populate-sdk-*>` class sets the
6535 default value:
6536 ::
6537
6538 SDK_INHERIT_BLACKLIST ?= "buildhistory icecc"
6539
6540 Some classes are not generally applicable within the extensible SDK
6541 context. You can use this variable to disable those classes.
6542
6543 For additional information on how to customize the extensible SDK's
6544 configuration, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06006545 ":ref:`sdk-manual/appendix-customizing:configuring the extensible sdk`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006546 section in the Yocto Project Application Development and the
6547 Extensible Software Development Kit (eSDK) manual.
6548
Andrew Geisslerf0343792020-11-18 10:42:21 -06006549 :term:`SDK_LOCAL_CONF_BLACKLIST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006550 A list of variables not allowed through from the OpenEmbedded build
6551 system configuration into the extensible SDK configuration. Usually,
6552 these are variables that are specific to the machine on which the
6553 build system is running and thus would be potentially problematic
6554 within the extensible SDK.
6555
6556 By default, ``SDK_LOCAL_CONF_BLACKLIST`` is set in the
6557 :ref:`populate-sdk-ext <ref-classes-populate-sdk-*>` class and
6558 excludes the following variables:
6559
6560 - :term:`CONF_VERSION`
6561 - :term:`BB_NUMBER_THREADS`
6562 - :term:`bitbake:BB_NUMBER_PARSE_THREADS`
6563 - :term:`PARALLEL_MAKE`
6564 - :term:`PRSERV_HOST`
6565 - :term:`SSTATE_MIRRORS` :term:`DL_DIR`
6566 - :term:`SSTATE_DIR` :term:`TMPDIR`
6567 - :term:`BB_SERVER_TIMEOUT`
6568
6569 For additional information on how to customize the extensible SDK's
6570 configuration, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06006571 ":ref:`sdk-manual/appendix-customizing:configuring the extensible sdk`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006572 section in the Yocto Project Application Development and the
6573 Extensible Software Development Kit (eSDK) manual.
6574
Andrew Geisslerf0343792020-11-18 10:42:21 -06006575 :term:`SDK_LOCAL_CONF_WHITELIST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006576 A list of variables allowed through from the OpenEmbedded build
6577 system configuration into the extensible SDK configuration. By
6578 default, the list of variables is empty and is set in the
6579 :ref:`populate-sdk-ext <ref-classes-populate-sdk-*>` class.
6580
6581 This list overrides the variables specified using the
6582 :term:`SDK_LOCAL_CONF_BLACKLIST`
6583 variable as well as any variables identified by automatic
6584 blacklisting due to the "/" character being found at the start of the
6585 value, which is usually indicative of being a path and thus might not
6586 be valid on the system where the SDK is installed.
6587
6588 For additional information on how to customize the extensible SDK's
6589 configuration, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06006590 ":ref:`sdk-manual/appendix-customizing:configuring the extensible sdk`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006591 section in the Yocto Project Application Development and the
6592 Extensible Software Development Kit (eSDK) manual.
6593
Andrew Geisslerf0343792020-11-18 10:42:21 -06006594 :term:`SDK_NAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006595 The base name for SDK output files. The name is derived from the
6596 :term:`DISTRO`, :term:`TCLIBC`,
6597 :term:`SDK_ARCH`,
6598 :term:`IMAGE_BASENAME`, and
6599 :term:`TUNE_PKGARCH` variables:
6600 ::
6601
6602 SDK_NAME = "${DISTRO}-${TCLIBC}-${SDK_ARCH}-${IMAGE_BASENAME}-${TUNE_PKGARCH}"
6603
Andrew Geisslerf0343792020-11-18 10:42:21 -06006604 :term:`SDK_OS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006605 Specifies the operating system for which the SDK will be built. The
6606 default value is the value of :term:`BUILD_OS`.
6607
Andrew Geisslerf0343792020-11-18 10:42:21 -06006608 :term:`SDK_OUTPUT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006609 The location used by the OpenEmbedded build system when creating SDK
6610 output. The :ref:`populate_sdk_base <ref-classes-populate-sdk-*>`
6611 class defines the variable as follows:
6612 ::
6613
6614 SDK_DIR = "${WORKDIR}/sdk"
6615 SDK_OUTPUT = "${SDK_DIR}/image"
6616 SDK_DEPLOY = "${DEPLOY_DIR}/sdk"
6617
6618 .. note::
6619
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006620 The ``SDK_OUTPUT`` directory is a temporary directory as it is part of
6621 :term:`WORKDIR` by way of :term:`SDK_DIR`. The final output directory is
6622 :term:`SDK_DEPLOY`.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006623
Andrew Geisslerf0343792020-11-18 10:42:21 -06006624 :term:`SDK_PACKAGE_ARCHS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006625 Specifies a list of architectures compatible with the SDK machine.
6626 This variable is set automatically and should not normally be
6627 hand-edited. Entries are separated using spaces and listed in order
6628 of priority. The default value for ``SDK_PACKAGE_ARCHS`` is "all any
6629 noarch ${SDK_ARCH}-${SDKPKGSUFFIX}".
6630
Andrew Geisslerf0343792020-11-18 10:42:21 -06006631 :term:`SDK_POSTPROCESS_COMMAND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006632 Specifies a list of functions to call once the OpenEmbedded build
6633 system creates the SDK. You can specify functions separated by
6634 semicolons: SDK_POSTPROCESS_COMMAND += "function; ... "
6635
6636 If you need to pass an SDK path to a command within a function, you
6637 can use ``${SDK_DIR}``, which points to the parent directory used by
6638 the OpenEmbedded build system when creating SDK output. See the
6639 :term:`SDK_DIR` variable for more information.
6640
Andrew Geisslerf0343792020-11-18 10:42:21 -06006641 :term:`SDK_PREFIX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006642 The toolchain binary prefix used for ``nativesdk`` recipes. The
6643 OpenEmbedded build system uses the ``SDK_PREFIX`` value to set the
6644 :term:`TARGET_PREFIX` when building
6645 ``nativesdk`` recipes. The default value is "${SDK_SYS}-".
6646
Andrew Geisslerf0343792020-11-18 10:42:21 -06006647 :term:`SDK_RECRDEP_TASKS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006648 A list of shared state tasks added to the extensible SDK. By default,
6649 the following tasks are added:
6650
6651 - do_populate_lic
6652 - do_package_qa
6653 - do_populate_sysroot
6654 - do_deploy
6655
6656 Despite the default value of "" for the
6657 ``SDK_RECRDEP_TASKS`` variable, the above four tasks are always added
6658 to the SDK. To specify tasks beyond these four, you need to use the
6659 ``SDK_RECRDEP_TASKS`` variable (e.g. you are defining additional
6660 tasks that are needed in order to build
6661 :term:`SDK_TARGETS`).
6662
Andrew Geisslerf0343792020-11-18 10:42:21 -06006663 :term:`SDK_SYS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006664 Specifies the system, including the architecture and the operating
6665 system, for which the SDK will be built.
6666
6667 The OpenEmbedded build system automatically sets this variable based
6668 on :term:`SDK_ARCH`,
6669 :term:`SDK_VENDOR`, and
6670 :term:`SDK_OS`. You do not need to set the ``SDK_SYS``
6671 variable yourself.
6672
Andrew Geisslerf0343792020-11-18 10:42:21 -06006673 :term:`SDK_TARGET_MANIFEST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006674 The manifest file for the target part of the SDK. This file lists all
6675 the installed packages that make up the target part of the SDK. The
6676 file contains package information on a line-per-package basis as
6677 follows:
6678 ::
6679
6680 packagename packagearch version
6681
6682 The :ref:`populate_sdk_base <ref-classes-populate-sdk-*>` class
6683 defines the manifest file as follows:
6684 ::
6685
6686 SDK_TARGET_MANIFEST = "${SDK_DEPLOY}/${TOOLCHAIN_OUTPUTNAME}.target.manifest"
6687
6688 The location is derived using the :term:`SDK_DEPLOY` and
6689 :term:`TOOLCHAIN_OUTPUTNAME` variables.
6690
Andrew Geisslerf0343792020-11-18 10:42:21 -06006691 :term:`SDK_TARGETS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006692 A list of targets to install from shared state as part of the
6693 standard or extensible SDK installation. The default value is "${PN}"
6694 (i.e. the image from which the SDK is built).
6695
6696 The ``SDK_TARGETS`` variable is an internal variable and typically
6697 would not be changed.
6698
Andrew Geisslerf0343792020-11-18 10:42:21 -06006699 :term:`SDK_TITLE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006700 The title to be printed when running the SDK installer. By default,
6701 this title is based on the :term:`DISTRO_NAME` or
6702 :term:`DISTRO` variable and is set in the
6703 :ref:`populate_sdk_base <ref-classes-populate-sdk-*>` class as
6704 follows:
6705 ::
6706
6707 SDK_TITLE ??= "${@d.getVar('DISTRO_NAME') or d.getVar('DISTRO')} SDK"
6708
6709 For the default distribution "poky",
6710 ``SDK_TITLE`` is set to "Poky (Yocto Project Reference Distro)".
6711
6712 For information on how to change this default title, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06006713 ":ref:`sdk-manual/appendix-customizing:changing the extensible sdk installer title`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006714 section in the Yocto Project Application Development and the
6715 Extensible Software Development Kit (eSDK) manual.
6716
Andrew Geisslerf0343792020-11-18 10:42:21 -06006717 :term:`SDK_UPDATE_URL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006718 An optional URL for an update server for the extensible SDK. If set,
6719 the value is used as the default update server when running
6720 ``devtool sdk-update`` within the extensible SDK.
6721
Andrew Geisslerf0343792020-11-18 10:42:21 -06006722 :term:`SDK_VENDOR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006723 Specifies the name of the SDK vendor.
6724
Andrew Geisslerf0343792020-11-18 10:42:21 -06006725 :term:`SDK_VERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006726 Specifies the version of the SDK. The distribution configuration file
6727 (e.g. ``/meta-poky/conf/distro/poky.conf``) defines the
6728 ``SDK_VERSION`` as follows:
6729 ::
6730
6731 SDK_VERSION = "${@d.getVar('DISTRO_VERSION').replace('snapshot-${DATE}','snapshot')}"
6732
6733 For additional information, see the
6734 :term:`DISTRO_VERSION` and
6735 :term:`DATE` variables.
6736
Andrew Geisslerf0343792020-11-18 10:42:21 -06006737 :term:`SDKEXTPATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006738 The default installation directory for the Extensible SDK. By
6739 default, this directory is based on the :term:`DISTRO`
6740 variable and is set in the
6741 :ref:`populate_sdk_base <ref-classes-populate-sdk-*>` class as
6742 follows:
6743 ::
6744
6745 SDKEXTPATH ??= "~/${@d.getVar('DISTRO')}_sdk"
6746
6747 For the
6748 default distribution "poky", the ``SDKEXTPATH`` is set to "poky_sdk".
6749
6750 For information on how to change this default directory, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06006751 ":ref:`sdk-manual/appendix-customizing:changing the default sdk installation directory`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006752 section in the Yocto Project Application Development and the
6753 Extensible Software Development Kit (eSDK) manual.
6754
Andrew Geisslerf0343792020-11-18 10:42:21 -06006755 :term:`SDKIMAGE_FEATURES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006756 Equivalent to ``IMAGE_FEATURES``. However, this variable applies to
6757 the SDK generated from an image using the following command:
6758 ::
6759
6760 $ bitbake -c populate_sdk imagename
6761
Andrew Geisslerf0343792020-11-18 10:42:21 -06006762 :term:`SDKMACHINE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006763 The machine for which the SDK is built. In other words, the SDK is
6764 built such that it runs on the target you specify with the
6765 ``SDKMACHINE`` value. The value points to a corresponding ``.conf``
6766 file under ``conf/machine-sdk/``.
6767
6768 You can use "i686" and "x86_64" as possible values for this variable.
6769 The variable defaults to "i686" and is set in the local.conf file in
6770 the Build Directory.
6771 ::
6772
6773 SDKMACHINE ?= "i686"
6774
6775 .. note::
6776
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006777 You cannot set the ``SDKMACHINE``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006778 variable in your distribution configuration file. If you do, the
6779 configuration will not take affect.
6780
Andrew Geisslerf0343792020-11-18 10:42:21 -06006781 :term:`SDKPATH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006782 Defines the path offered to the user for installation of the SDK that
6783 is generated by the OpenEmbedded build system. The path appears as
6784 the default location for installing the SDK when you run the SDK's
6785 installation script. You can override the offered path when you run
6786 the script.
6787
Andrew Geisslerf0343792020-11-18 10:42:21 -06006788 :term:`SDKTARGETSYSROOT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006789 The full path to the sysroot used for cross-compilation within an SDK
6790 as it will be when installed into the default
6791 :term:`SDKPATH`.
6792
Andrew Geisslerf0343792020-11-18 10:42:21 -06006793 :term:`SECTION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006794 The section in which packages should be categorized. Package
6795 management utilities can make use of this variable.
6796
Andrew Geisslerf0343792020-11-18 10:42:21 -06006797 :term:`SELECTED_OPTIMIZATION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006798 Specifies the optimization flags passed to the C compiler when
6799 building for the target. The flags are passed through the default
6800 value of the :term:`TARGET_CFLAGS` variable.
6801
6802 The ``SELECTED_OPTIMIZATION`` variable takes the value of
6803 ``FULL_OPTIMIZATION`` unless ``DEBUG_BUILD`` = "1". If that is the
6804 case, the value of ``DEBUG_OPTIMIZATION`` is used.
6805
Andrew Geisslerf0343792020-11-18 10:42:21 -06006806 :term:`SERIAL_CONSOLE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006807 Defines a serial console (TTY) to enable using
6808 `getty <https://en.wikipedia.org/wiki/Getty_(Unix)>`__. Provide a
6809 value that specifies the baud rate followed by the TTY device name
6810 separated by a space. You cannot specify more than one TTY device:
6811 ::
6812
6813 SERIAL_CONSOLE = "115200 ttyS0"
6814
6815 .. note::
6816
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006817 The ``SERIAL_CONSOLE`` variable is deprecated. Please use the
6818 :term:`SERIAL_CONSOLES` variable.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006819
Andrew Geisslerf0343792020-11-18 10:42:21 -06006820 :term:`SERIAL_CONSOLES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006821 Defines a serial console (TTY) to enable using
6822 `getty <https://en.wikipedia.org/wiki/Getty_(Unix)>`__. Provide a
6823 value that specifies the baud rate followed by the TTY device name
6824 separated by a semicolon. Use spaces to separate multiple devices:
6825 ::
6826
6827 SERIAL_CONSOLES = "115200;ttyS0 115200;ttyS1"
6828
Andrew Geisslerf0343792020-11-18 10:42:21 -06006829 :term:`SERIAL_CONSOLES_CHECK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006830 Specifies serial consoles, which must be listed in
6831 :term:`SERIAL_CONSOLES`, to check against
6832 ``/proc/console`` before enabling them using getty. This variable
6833 allows aliasing in the format: <device>:<alias>. If a device was
6834 listed as "sclp_line0" in ``/dev/`` and "ttyS0" was listed in
6835 ``/proc/console``, you would do the following: ::
6836
6837 SERIAL_CONSOLES_CHECK = "slcp_line0:ttyS0"
6838
6839 This variable is currently only supported with SysVinit (i.e. not
6840 with systemd).
6841
Andrew Geisslerf0343792020-11-18 10:42:21 -06006842 :term:`SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006843 A list of recipe dependencies that should not be used to determine
6844 signatures of tasks from one recipe when they depend on tasks from
6845 another recipe. For example: ::
6846
6847 SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += "intone->mplayer2"
6848
6849 In the previous example, ``intone`` depends on ``mplayer2``.
6850
6851 You can use the special token ``"*"`` on the left-hand side of the
6852 dependency to match all recipes except the one on the right-hand
6853 side. Here is an example: ::
6854
6855 SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += "*->quilt-native"
6856
6857 In the previous example, all recipes except ``quilt-native`` ignore
6858 task signatures from the ``quilt-native`` recipe when determining
6859 their task signatures.
6860
6861 Use of this variable is one mechanism to remove dependencies that
6862 affect task signatures and thus force rebuilds when a recipe changes.
6863
6864 .. note::
6865
6866 If you add an inappropriate dependency for a recipe relationship,
6867 the software might break during runtime if the interface of the
6868 second recipe was changed after the first recipe had been built.
6869
Andrew Geisslerf0343792020-11-18 10:42:21 -06006870 :term:`SIGGEN_EXCLUDERECIPES_ABISAFE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006871 A list of recipes that are completely stable and will never change.
6872 The ABI for the recipes in the list are presented by output from the
6873 tasks run to build the recipe. Use of this variable is one way to
6874 remove dependencies from one recipe on another that affect task
6875 signatures and thus force rebuilds when the recipe changes.
6876
6877 .. note::
6878
6879 If you add an inappropriate variable to this list, the software
6880 might break at runtime if the interface of the recipe was changed
6881 after the other had been built.
6882
Andrew Geisslerf0343792020-11-18 10:42:21 -06006883 :term:`SITEINFO_BITS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006884 Specifies the number of bits for the target system CPU. The value
6885 should be either "32" or "64".
6886
Andrew Geisslerf0343792020-11-18 10:42:21 -06006887 :term:`SITEINFO_ENDIANNESS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006888 Specifies the endian byte order of the target system. The value
6889 should be either "le" for little-endian or "be" for big-endian.
6890
Andrew Geisslerf0343792020-11-18 10:42:21 -06006891 :term:`SKIP_FILEDEPS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006892 Enables removal of all files from the "Provides" section of an RPM
6893 package. Removal of these files is required for packages containing
6894 prebuilt binaries and libraries such as ``libstdc++`` and ``glibc``.
6895
6896 To enable file removal, set the variable to "1" in your
6897 ``conf/local.conf`` configuration file in your:
6898 :term:`Build Directory`.
6899 ::
6900
6901 SKIP_FILEDEPS = "1"
6902
Andrew Geisslerf0343792020-11-18 10:42:21 -06006903 :term:`SOC_FAMILY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006904 Groups together machines based upon the same family of SOC (System On
6905 Chip). You typically set this variable in a common ``.inc`` file that
6906 you include in the configuration files of all the machines.
6907
6908 .. note::
6909
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006910 You must include ``conf/machine/include/soc-family.inc`` for this
6911 variable to appear in :term:`MACHINEOVERRIDES`.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006912
Andrew Geisslerf0343792020-11-18 10:42:21 -06006913 :term:`SOLIBS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006914 Defines the suffix for shared libraries used on the target platform.
6915 By default, this suffix is ".so.*" for all Linux-based systems and is
6916 defined in the ``meta/conf/bitbake.conf`` configuration file.
6917
6918 You will see this variable referenced in the default values of
6919 ``FILES_${PN}``.
6920
Andrew Geisslerf0343792020-11-18 10:42:21 -06006921 :term:`SOLIBSDEV`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006922 Defines the suffix for the development symbolic link (symlink) for
6923 shared libraries on the target platform. By default, this suffix is
6924 ".so" for Linux-based systems and is defined in the
6925 ``meta/conf/bitbake.conf`` configuration file.
6926
6927 You will see this variable referenced in the default values of
6928 ``FILES_${PN}-dev``.
6929
Andrew Geisslerf0343792020-11-18 10:42:21 -06006930 :term:`SOURCE_MIRROR_FETCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006931 When you are fetching files to create a mirror of sources (i.e.
6932 creating a source mirror), setting ``SOURCE_MIRROR_FETCH`` to "1" in
6933 your ``local.conf`` configuration file ensures the source for all
6934 recipes are fetched regardless of whether or not a recipe is
6935 compatible with the configuration. A recipe is considered
6936 incompatible with the currently configured machine when either or
6937 both the :term:`COMPATIBLE_MACHINE`
6938 variable and :term:`COMPATIBLE_HOST` variables
6939 specify compatibility with a machine other than that of the current
6940 machine or host.
6941
6942 .. note::
6943
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006944 Do not set the ``SOURCE_MIRROR_FETCH``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006945 variable unless you are creating a source mirror. In other words,
6946 do not set the variable during a normal build.
6947
Andrew Geisslerf0343792020-11-18 10:42:21 -06006948 :term:`SOURCE_MIRROR_URL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006949 Defines your own :term:`PREMIRRORS` from which to
6950 first fetch source before attempting to fetch from the upstream
6951 specified in :term:`SRC_URI`.
6952
6953 To use this variable, you must globally inherit the
6954 :ref:`own-mirrors <ref-classes-own-mirrors>` class and then provide
6955 the URL to your mirrors. Here is the general syntax:
6956 ::
6957
6958 INHERIT += "own-mirrors"
6959 SOURCE_MIRROR_URL = "http://example.com/my_source_mirror"
6960
6961 .. note::
6962
Andrew Geissler4c19ea12020-10-27 13:52:24 -05006963 You can specify only a single URL in ``SOURCE_MIRROR_URL``.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006964
Andrew Geisslerf0343792020-11-18 10:42:21 -06006965 :term:`SPDXLICENSEMAP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006966 Maps commonly used license names to their SPDX counterparts found in
6967 ``meta/files/common-licenses/``. For the default ``SPDXLICENSEMAP``
6968 mappings, see the ``meta/conf/licenses.conf`` file.
6969
6970 For additional information, see the :term:`LICENSE`
6971 variable.
6972
Andrew Geisslerf0343792020-11-18 10:42:21 -06006973 :term:`SPECIAL_PKGSUFFIX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006974 A list of prefixes for :term:`PN` used by the OpenEmbedded
6975 build system to create variants of recipes or packages. The list
6976 specifies the prefixes to strip off during certain circumstances such
6977 as the generation of the :term:`BPN` variable.
6978
Andrew Geisslerf0343792020-11-18 10:42:21 -06006979 :term:`SPL_BINARY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006980 The file type for the Secondary Program Loader (SPL). Some devices
6981 use an SPL from which to boot (e.g. the BeagleBone development
6982 board). For such cases, you can declare the file type of the SPL
6983 binary in the ``u-boot.inc`` include file, which is used in the
6984 U-Boot recipe.
6985
6986 The SPL file type is set to "null" by default in the ``u-boot.inc``
6987 file as follows:
6988 ::
6989
6990 # Some versions of u-boot build an SPL (Second Program Loader) image that
6991 # should be packaged along with the u-boot binary as well as placed in the
6992 # deploy directory. For those versions they can set the following variables
6993 # to allow packaging the SPL.
6994 SPL_BINARY ?= ""
6995 SPL_BINARYNAME ?= "${@os.path.basename(d.getVar("SPL_BINARY"))}"
6996 SPL_IMAGE ?= "${SPL_BINARYNAME}-${MACHINE}-${PV}-${PR}"
6997 SPL_SYMLINK ?= "${SPL_BINARYNAME}-${MACHINE}"
6998
6999 The ``SPL_BINARY`` variable helps form
7000 various ``SPL_*`` variables used by the OpenEmbedded build system.
7001
7002 See the BeagleBone machine configuration example in the
Andrew Geissler09209ee2020-12-13 08:44:15 -06007003 ":ref:`dev-manual/common-tasks:adding a layer using the \`\`bitbake-layers\`\` script`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007004 section in the Yocto Project Board Support Package Developer's Guide
7005 for additional information.
7006
Andrew Geisslerf0343792020-11-18 10:42:21 -06007007 :term:`SRC_URI`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007008 The list of source files - local or remote. This variable tells the
7009 OpenEmbedded build system which bits to pull in for the build and how
7010 to pull them in. For example, if the recipe or append file only needs
7011 to fetch a tarball from the Internet, the recipe or append file uses
7012 a single ``SRC_URI`` entry. On the other hand, if the recipe or
7013 append file needs to fetch a tarball, apply two patches, and include
7014 a custom file, the recipe or append file would include four instances
7015 of the variable.
7016
7017 The following list explains the available URI protocols. URI
7018 protocols are highly dependent on particular BitBake Fetcher
7019 submodules. Depending on the fetcher BitBake uses, various URL
7020 parameters are employed. For specifics on the supported Fetchers, see
Andrew Geissler09209ee2020-12-13 08:44:15 -06007021 the ":ref:`Fetchers <bitbake:bitbake-user-manual/bitbake-user-manual-fetching:fetchers>`" section in the
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007022 BitBake User Manual.
7023
7024 - ``file://`` - Fetches files, which are usually files shipped
7025 with the :term:`Metadata`, from the local machine (e.g.
Andrew Geissler09209ee2020-12-13 08:44:15 -06007026 :ref:`patch <overview-manual/concepts:patching>` files).
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007027 The path is relative to the :term:`FILESPATH`
7028 variable. Thus, the build system searches, in order, from the
7029 following directories, which are assumed to be a subdirectories of
7030 the directory in which the recipe file (``.bb``) or append file
7031 (``.bbappend``) resides:
7032
7033 - ``${BPN}`` - The base recipe name without any special suffix
7034 or version numbers.
7035
7036 - ``${BP}`` - ``${BPN}-${PV}``. The base recipe name and
7037 version but without any special package name suffix.
7038
7039 - *files -* Files within a directory, which is named ``files``
7040 and is also alongside the recipe or append file.
7041
7042 .. note::
7043
7044 If you want the build system to pick up files specified through
7045 a
7046 SRC_URI
7047 statement from your append file, you need to be sure to extend
7048 the
7049 FILESPATH
7050 variable by also using the
7051 FILESEXTRAPATHS
7052 variable from within your append file.
7053
7054 - ``bzr://`` - Fetches files from a Bazaar revision control
7055 repository.
7056
7057 - ``git://`` - Fetches files from a Git revision control
7058 repository.
7059
7060 - ``osc://`` - Fetches files from an OSC (OpenSUSE Build service)
7061 revision control repository.
7062
7063 - ``repo://`` - Fetches files from a repo (Git) repository.
7064
7065 - ``ccrc://`` - Fetches files from a ClearCase repository.
7066
7067 - ``http://`` - Fetches files from the Internet using ``http``.
7068
7069 - ``https://`` - Fetches files from the Internet using ``https``.
7070
7071 - ``ftp://`` - Fetches files from the Internet using ``ftp``.
7072
7073 - ``cvs://`` - Fetches files from a CVS revision control
7074 repository.
7075
7076 - ``hg://`` - Fetches files from a Mercurial (``hg``) revision
7077 control repository.
7078
7079 - ``p4://`` - Fetches files from a Perforce (``p4``) revision
7080 control repository.
7081
7082 - ``ssh://`` - Fetches files from a secure shell.
7083
7084 - ``svn://`` - Fetches files from a Subversion (``svn``) revision
7085 control repository.
7086
7087 - ``npm://`` - Fetches JavaScript modules from a registry.
7088
7089 Standard and recipe-specific options for ``SRC_URI`` exist. Here are
7090 standard options:
7091
7092 - ``apply`` - Whether to apply the patch or not. The default
7093 action is to apply the patch.
7094
7095 - ``striplevel`` - Which striplevel to use when applying the
7096 patch. The default level is 1.
7097
7098 - ``patchdir`` - Specifies the directory in which the patch should
7099 be applied. The default is ``${``\ :term:`S`\ ``}``.
7100
7101 Here are options specific to recipes building code from a revision
7102 control system:
7103
7104 - ``mindate`` - Apply the patch only if
7105 :term:`SRCDATE` is equal to or greater than
7106 ``mindate``.
7107
7108 - ``maxdate`` - Apply the patch only if ``SRCDATE`` is not later
7109 than ``maxdate``.
7110
7111 - ``minrev`` - Apply the patch only if ``SRCREV`` is equal to or
7112 greater than ``minrev``.
7113
7114 - ``maxrev`` - Apply the patch only if ``SRCREV`` is not later
7115 than ``maxrev``.
7116
7117 - ``rev`` - Apply the patch only if ``SRCREV`` is equal to
7118 ``rev``.
7119
7120 - ``notrev`` - Apply the patch only if ``SRCREV`` is not equal to
7121 ``rev``.
7122
7123 Here are some additional options worth mentioning:
7124
7125 - ``unpack`` - Controls whether or not to unpack the file if it is
7126 an archive. The default action is to unpack the file.
7127
7128 - ``destsuffix`` - Places the file (or extracts its contents) into
7129 the specified subdirectory of :term:`WORKDIR` when
7130 the Git fetcher is used.
7131
7132 - ``subdir`` - Places the file (or extracts its contents) into the
7133 specified subdirectory of ``WORKDIR`` when the local (``file://``)
7134 fetcher is used.
7135
7136 - ``localdir`` - Places the file (or extracts its contents) into
7137 the specified subdirectory of ``WORKDIR`` when the CVS fetcher is
7138 used.
7139
7140 - ``subpath`` - Limits the checkout to a specific subpath of the
7141 tree when using the Git fetcher is used.
7142
7143 - ``name`` - Specifies a name to be used for association with
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007144 ``SRC_URI`` checksums or :term:`SRCREV` when you have more than one
7145 file or git repository specified in ``SRC_URI``. For example:
7146 ::
7147
7148 SRC_URI = "git://example.com/foo.git;name=first \
7149 git://example.com/bar.git;name=second \
7150 http://example.com/file.tar.gz;name=third"
7151
7152 SRCREV_first = "f1d2d2f924e986ac86fdf7b36c94bcdf32beec15"
7153 SRCREV_second = "e242ed3bffccdf271b7fbaf34ed72d089537b42f"
7154 SRC_URI[third.sha256sum] = "13550350a8681c84c861aac2e5b440161c2b33a3e4f302ac680ca5b686de48de"
7155
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007156
7157 - ``downloadfilename`` - Specifies the filename used when storing
7158 the downloaded file.
7159
Andrew Geisslerf0343792020-11-18 10:42:21 -06007160 :term:`SRC_URI_OVERRIDES_PACKAGE_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007161 By default, the OpenEmbedded build system automatically detects
7162 whether ``SRC_URI`` contains files that are machine-specific. If so,
7163 the build system automatically changes ``PACKAGE_ARCH``. Setting this
7164 variable to "0" disables this behavior.
7165
Andrew Geisslerf0343792020-11-18 10:42:21 -06007166 :term:`SRCDATE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007167 The date of the source code used to build the package. This variable
7168 applies only if the source was fetched from a Source Code Manager
7169 (SCM).
7170
Andrew Geisslerf0343792020-11-18 10:42:21 -06007171 :term:`SRCPV`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007172 Returns the version string of the current package. This string is
7173 used to help define the value of :term:`PV`.
7174
7175 The ``SRCPV`` variable is defined in the ``meta/conf/bitbake.conf``
7176 configuration file in the :term:`Source Directory` as
7177 follows:
7178 ::
7179
7180 SRCPV = "${@bb.fetch2.get_srcrev(d)}"
7181
7182 Recipes that need to define ``PV`` do so with the help of the
7183 ``SRCPV``. For example, the ``ofono`` recipe (``ofono_git.bb``)
7184 located in ``meta/recipes-connectivity`` in the Source Directory
7185 defines ``PV`` as follows:
7186 ::
7187
7188 PV = "0.12-git${SRCPV}"
7189
Andrew Geisslerf0343792020-11-18 10:42:21 -06007190 :term:`SRCREV`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007191 The revision of the source code used to build the package. This
7192 variable applies to Subversion, Git, Mercurial, and Bazaar only. Note
7193 that if you want to build a fixed revision and you want to avoid
7194 performing a query on the remote repository every time BitBake parses
7195 your recipe, you should specify a ``SRCREV`` that is a full revision
7196 identifier and not just a tag.
7197
7198 .. note::
7199
7200 For information on limitations when inheriting the latest revision
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007201 of software using ``SRCREV``, see the :term:`AUTOREV` variable
7202 description and the
Andrew Geissler09209ee2020-12-13 08:44:15 -06007203 ":ref:`dev-manual/common-tasks:automatically incrementing a package version number`"
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007204 section, which is in the Yocto Project Development Tasks Manual.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007205
Andrew Geisslerf0343792020-11-18 10:42:21 -06007206 :term:`SSTATE_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007207 The directory for the shared state cache.
7208
Andrew Geisslerf0343792020-11-18 10:42:21 -06007209 :term:`SSTATE_MIRROR_ALLOW_NETWORK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007210 If set to "1", allows fetches from mirrors that are specified in
7211 :term:`SSTATE_MIRRORS` to work even when
7212 fetching from the network is disabled by setting ``BB_NO_NETWORK`` to
7213 "1". Using the ``SSTATE_MIRROR_ALLOW_NETWORK`` variable is useful if
7214 you have set ``SSTATE_MIRRORS`` to point to an internal server for
7215 your shared state cache, but you want to disable any other fetching
7216 from the network.
7217
Andrew Geisslerf0343792020-11-18 10:42:21 -06007218 :term:`SSTATE_MIRRORS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007219 Configures the OpenEmbedded build system to search other mirror
7220 locations for prebuilt cache data objects before building out the
7221 data. This variable works like fetcher :term:`MIRRORS`
7222 and :term:`PREMIRRORS` and points to the cache
7223 locations to check for the shared state (sstate) objects.
7224
7225 You can specify a filesystem directory or a remote URL such as HTTP
7226 or FTP. The locations you specify need to contain the shared state
7227 cache (sstate-cache) results from previous builds. The sstate-cache
7228 you point to can also be from builds on other machines.
7229
7230 When pointing to sstate build artifacts on another machine that uses
7231 a different GCC version for native builds, you must configure
7232 ``SSTATE_MIRRORS`` with a regular expression that maps local search
7233 paths to server paths. The paths need to take into account
7234 :term:`NATIVELSBSTRING` set by the
7235 :ref:`uninative <ref-classes-uninative>` class. For example, the
7236 following maps the local search path ``universal-4.9`` to the
7237 server-provided path server_url_sstate_path:
7238 ::
7239
7240 SSTATE_MIRRORS ?= "file://universal-4.9/(.*) http://server_url_sstate_path/universal-4.8/\1 \n"
7241
7242 If a mirror uses the same structure as
7243 :term:`SSTATE_DIR`, you need to add "PATH" at the
7244 end as shown in the examples below. The build system substitutes the
7245 correct path within the directory structure.
7246 ::
7247
7248 SSTATE_MIRRORS ?= "\
7249 file://.* http://someserver.tld/share/sstate/PATH;downloadfilename=PATH \n \
7250 file://.* file:///some-local-dir/sstate/PATH"
7251
Andrew Geisslerf0343792020-11-18 10:42:21 -06007252 :term:`SSTATE_SCAN_FILES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007253 Controls the list of files the OpenEmbedded build system scans for
7254 hardcoded installation paths. The variable uses a space-separated
7255 list of filenames (not paths) with standard wildcard characters
7256 allowed.
7257
7258 During a build, the OpenEmbedded build system creates a shared state
7259 (sstate) object during the first stage of preparing the sysroots.
7260 That object is scanned for hardcoded paths for original installation
7261 locations. The list of files that are scanned for paths is controlled
7262 by the ``SSTATE_SCAN_FILES`` variable. Typically, recipes add files
7263 they want to be scanned to the value of ``SSTATE_SCAN_FILES`` rather
7264 than the variable being comprehensively set. The
7265 :ref:`sstate <ref-classes-sstate>` class specifies the default list
7266 of files.
7267
7268 For details on the process, see the
7269 :ref:`staging <ref-classes-staging>` class.
7270
Andrew Geisslerf0343792020-11-18 10:42:21 -06007271 :term:`STAGING_BASE_LIBDIR_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007272 Specifies the path to the ``/lib`` subdirectory of the sysroot
7273 directory for the build host.
7274
Andrew Geisslerf0343792020-11-18 10:42:21 -06007275 :term:`STAGING_BASELIBDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007276 Specifies the path to the ``/lib`` subdirectory of the sysroot
7277 directory for the target for which the current recipe is being built
7278 (:term:`STAGING_DIR_HOST`).
7279
Andrew Geisslerf0343792020-11-18 10:42:21 -06007280 :term:`STAGING_BINDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007281 Specifies the path to the ``/usr/bin`` subdirectory of the sysroot
7282 directory for the target for which the current recipe is being built
7283 (:term:`STAGING_DIR_HOST`).
7284
Andrew Geisslerf0343792020-11-18 10:42:21 -06007285 :term:`STAGING_BINDIR_CROSS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007286 Specifies the path to the directory containing binary configuration
7287 scripts. These scripts provide configuration information for other
7288 software that wants to make use of libraries or include files
7289 provided by the software associated with the script.
7290
7291 .. note::
7292
7293 This style of build configuration has been largely replaced by
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007294 ``pkg-config``. Consequently, if ``pkg-config`` is supported by the
7295 library to which you are linking, it is recommended you use
7296 ``pkg-config`` instead of a provided configuration script.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007297
Andrew Geisslerf0343792020-11-18 10:42:21 -06007298 :term:`STAGING_BINDIR_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007299 Specifies the path to the ``/usr/bin`` subdirectory of the sysroot
7300 directory for the build host.
7301
Andrew Geisslerf0343792020-11-18 10:42:21 -06007302 :term:`STAGING_DATADIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007303 Specifies the path to the ``/usr/share`` subdirectory of the sysroot
7304 directory for the target for which the current recipe is being built
7305 (:term:`STAGING_DIR_HOST`).
7306
Andrew Geisslerf0343792020-11-18 10:42:21 -06007307 :term:`STAGING_DATADIR_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007308 Specifies the path to the ``/usr/share`` subdirectory of the sysroot
7309 directory for the build host.
7310
Andrew Geisslerf0343792020-11-18 10:42:21 -06007311 :term:`STAGING_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007312 Helps construct the ``recipe-sysroots`` directory, which is used
7313 during packaging.
7314
7315 For information on how staging for recipe-specific sysroots occurs,
7316 see the :ref:`ref-tasks-populate_sysroot`
Andrew Geissler09209ee2020-12-13 08:44:15 -06007317 task, the ":ref:`sdk-manual/extensible:sharing files between recipes`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007318 section in the Yocto Project Development Tasks Manual, the
Andrew Geissler09209ee2020-12-13 08:44:15 -06007319 ":ref:`overview-manual/concepts:configuration, compilation, and staging`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007320 section in the Yocto Project Overview and Concepts Manual, and the
7321 :term:`SYSROOT_DIRS` variable.
7322
7323 .. note::
7324
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007325 Recipes should never write files directly under the ``STAGING_DIR``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007326 directory because the OpenEmbedded build system manages the
7327 directory automatically. Instead, files should be installed to
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007328 ``${``\ :term:`D`\ ``}`` within your recipe's :ref:`ref-tasks-install`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007329 task and then the OpenEmbedded build system will stage a subset of
7330 those files into the sysroot.
7331
Andrew Geisslerf0343792020-11-18 10:42:21 -06007332 :term:`STAGING_DIR_HOST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007333 Specifies the path to the sysroot directory for the system on which
7334 the component is built to run (the system that hosts the component).
7335 For most recipes, this sysroot is the one in which that recipe's
7336 :ref:`ref-tasks-populate_sysroot` task copies
7337 files. Exceptions include ``-native`` recipes, where the
7338 ``do_populate_sysroot`` task instead uses
7339 :term:`STAGING_DIR_NATIVE`. Depending on
7340 the type of recipe and the build target, ``STAGING_DIR_HOST`` can
7341 have the following values:
7342
7343 - For recipes building for the target machine, the value is
7344 "${:term:`STAGING_DIR`}/${:term:`MACHINE`}".
7345
7346 - For native recipes building for the build host, the value is empty
7347 given the assumption that when building for the build host, the
7348 build host's own directories should be used.
7349
7350 .. note::
7351
7352 ``-native`` recipes are not installed into host paths like such
7353 as ``/usr``. Rather, these recipes are installed into
7354 ``STAGING_DIR_NATIVE``. When compiling ``-native`` recipes,
7355 standard build environment variables such as
7356 :term:`CPPFLAGS` and
7357 :term:`CFLAGS` are set up so that both host paths
7358 and ``STAGING_DIR_NATIVE`` are searched for libraries and
7359 headers using, for example, GCC's ``-isystem`` option.
7360
7361 Thus, the emphasis is that the ``STAGING_DIR*`` variables
7362 should be viewed as input variables by tasks such as
7363 :ref:`ref-tasks-configure`,
7364 :ref:`ref-tasks-compile`, and
7365 :ref:`ref-tasks-install`. Having the real system
7366 root correspond to ``STAGING_DIR_HOST`` makes conceptual sense
7367 for ``-native`` recipes, as they make use of host headers and
7368 libraries.
7369
Andrew Geisslerf0343792020-11-18 10:42:21 -06007370 :term:`STAGING_DIR_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007371 Specifies the path to the sysroot directory used when building
7372 components that run on the build host itself.
7373
Andrew Geisslerf0343792020-11-18 10:42:21 -06007374 :term:`STAGING_DIR_TARGET`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007375 Specifies the path to the sysroot used for the system for which the
7376 component generates code. For components that do not generate code,
7377 which is the majority, ``STAGING_DIR_TARGET`` is set to match
7378 :term:`STAGING_DIR_HOST`.
7379
7380 Some recipes build binaries that can run on the target system but
7381 those binaries in turn generate code for another different system
7382 (e.g. cross-canadian recipes). Using terminology from GNU, the
7383 primary system is referred to as the "HOST" and the secondary, or
7384 different, system is referred to as the "TARGET". Thus, the binaries
7385 run on the "HOST" system and generate binaries for the "TARGET"
7386 system. The ``STAGING_DIR_HOST`` variable points to the sysroot used
7387 for the "HOST" system, while ``STAGING_DIR_TARGET`` points to the
7388 sysroot used for the "TARGET" system.
7389
Andrew Geisslerf0343792020-11-18 10:42:21 -06007390 :term:`STAGING_ETCDIR_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007391 Specifies the path to the ``/etc`` subdirectory of the sysroot
7392 directory for the build host.
7393
Andrew Geisslerf0343792020-11-18 10:42:21 -06007394 :term:`STAGING_EXECPREFIXDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007395 Specifies the path to the ``/usr`` subdirectory of the sysroot
7396 directory for the target for which the current recipe is being built
7397 (:term:`STAGING_DIR_HOST`).
7398
Andrew Geisslerf0343792020-11-18 10:42:21 -06007399 :term:`STAGING_INCDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007400 Specifies the path to the ``/usr/include`` subdirectory of the
7401 sysroot directory for the target for which the current recipe being
7402 built (:term:`STAGING_DIR_HOST`).
7403
Andrew Geisslerf0343792020-11-18 10:42:21 -06007404 :term:`STAGING_INCDIR_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007405 Specifies the path to the ``/usr/include`` subdirectory of the
7406 sysroot directory for the build host.
7407
Andrew Geisslerf0343792020-11-18 10:42:21 -06007408 :term:`STAGING_KERNEL_BUILDDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007409 Points to the directory containing the kernel build artifacts.
7410 Recipes building software that needs to access kernel build artifacts
7411 (e.g. ``systemtap-uprobes``) can look in the directory specified with
7412 the ``STAGING_KERNEL_BUILDDIR`` variable to find these artifacts
7413 after the kernel has been built.
7414
Andrew Geisslerf0343792020-11-18 10:42:21 -06007415 :term:`STAGING_KERNEL_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007416 The directory with kernel headers that are required to build
7417 out-of-tree modules.
7418
Andrew Geisslerf0343792020-11-18 10:42:21 -06007419 :term:`STAGING_LIBDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007420 Specifies the path to the ``/usr/lib`` subdirectory of the sysroot
7421 directory for the target for which the current recipe is being built
7422 (:term:`STAGING_DIR_HOST`).
7423
Andrew Geisslerf0343792020-11-18 10:42:21 -06007424 :term:`STAGING_LIBDIR_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007425 Specifies the path to the ``/usr/lib`` subdirectory of the sysroot
7426 directory for the build host.
7427
Andrew Geisslerf0343792020-11-18 10:42:21 -06007428 :term:`STAMP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007429 Specifies the base path used to create recipe stamp files. The path
7430 to an actual stamp file is constructed by evaluating this string and
7431 then appending additional information. Currently, the default
7432 assignment for ``STAMP`` as set in the ``meta/conf/bitbake.conf``
7433 file is:
7434 ::
7435
7436 STAMP = "${STAMPS_DIR}/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}"
7437
7438 For information on how BitBake uses stamp files to determine if a
7439 task should be rerun, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06007440 ":ref:`overview-manual/concepts:stamp files and the rerunning of tasks`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007441 section in the Yocto Project Overview and Concepts Manual.
7442
7443 See :term:`STAMPS_DIR`,
7444 :term:`MULTIMACH_TARGET_SYS`,
7445 :term:`PN`, :term:`EXTENDPE`,
7446 :term:`PV`, and :term:`PR` for related variable
7447 information.
7448
Andrew Geisslerf0343792020-11-18 10:42:21 -06007449 :term:`STAMPS_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007450 Specifies the base directory in which the OpenEmbedded build system
7451 places stamps. The default directory is ``${TMPDIR}/stamps``.
7452
Andrew Geisslerf0343792020-11-18 10:42:21 -06007453 :term:`STRIP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007454 The minimal command and arguments to run ``strip``, which is used to
7455 strip symbols.
7456
Andrew Geisslerf0343792020-11-18 10:42:21 -06007457 :term:`SUMMARY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007458 The short (72 characters or less) summary of the binary package for
7459 packaging systems such as ``opkg``, ``rpm``, or ``dpkg``. By default,
7460 ``SUMMARY`` is used to define the
7461 :term:`DESCRIPTION` variable if ``DESCRIPTION`` is
7462 not set in the recipe.
7463
Andrew Geisslerf0343792020-11-18 10:42:21 -06007464 :term:`SVNDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007465 The directory in which files checked out of a Subversion system are
7466 stored.
7467
Andrew Geisslerf0343792020-11-18 10:42:21 -06007468 :term:`SYSLINUX_DEFAULT_CONSOLE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007469 Specifies the kernel boot default console. If you want to use a
7470 console other than the default, set this variable in your recipe as
7471 follows where "X" is the console number you want to use:
7472 ::
7473
7474 SYSLINUX_DEFAULT_CONSOLE = "console=ttyX"
7475
7476 The :ref:`syslinux <ref-classes-syslinux>` class initially sets
7477 this variable to null but then checks for a value later.
7478
Andrew Geisslerf0343792020-11-18 10:42:21 -06007479 :term:`SYSLINUX_OPTS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007480 Lists additional options to add to the syslinux file. You need to set
7481 this variable in your recipe. If you want to list multiple options,
7482 separate the options with a semicolon character (``;``).
7483
7484 The :ref:`syslinux <ref-classes-syslinux>` class uses this variable
7485 to create a set of options.
7486
Andrew Geisslerf0343792020-11-18 10:42:21 -06007487 :term:`SYSLINUX_SERIAL`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007488 Specifies the alternate serial port or turns it off. To turn off
7489 serial, set this variable to an empty string in your recipe. The
7490 variable's default value is set in the
7491 :ref:`syslinux <ref-classes-syslinux>` class as follows:
7492 ::
7493
7494 SYSLINUX_SERIAL ?= "0 115200"
7495
7496 The class checks for and uses the variable as needed.
7497
Andrew Geisslerf0343792020-11-18 10:42:21 -06007498 :term:`SYSLINUX_SERIAL_TTY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007499 Specifies the alternate console=tty... kernel boot argument. The
7500 variable's default value is set in the
7501 :ref:`syslinux <ref-classes-syslinux>` class as follows:
7502 ::
7503
7504 SYSLINUX_SERIAL_TTY ?= "console=ttyS0,115200"
7505
7506 The class checks for and uses the variable as needed.
7507
Andrew Geisslerf0343792020-11-18 10:42:21 -06007508 :term:`SYSLINUX_SPLASH`
7509 An ``.LSS`` file used as the background for the VGA boot menu when
7510 you use the boot menu. You need to set this variable in your recipe.
7511
7512 The :ref:`syslinux <ref-classes-syslinux>` class checks for this
7513 variable and if found, the OpenEmbedded build system installs the
7514 splash screen.
7515
7516 :term:`SYSROOT_DESTDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007517 Points to the temporary directory under the work directory (default
7518 "``${``\ :term:`WORKDIR`\ ``}/sysroot-destdir``")
7519 where the files populated into the sysroot are assembled during the
7520 :ref:`ref-tasks-populate_sysroot` task.
7521
Andrew Geisslerf0343792020-11-18 10:42:21 -06007522 :term:`SYSROOT_DIRS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007523 Directories that are staged into the sysroot by the
7524 :ref:`ref-tasks-populate_sysroot` task. By
7525 default, the following directories are staged:
7526 ::
7527
7528 SYSROOT_DIRS = " \
7529 ${includedir} \
7530 ${libdir} \
7531 ${base_libdir} \
7532 ${nonarch_base_libdir} \
7533 ${datadir} \
7534 "
7535
Andrew Geisslerf0343792020-11-18 10:42:21 -06007536 :term:`SYSROOT_DIRS_BLACKLIST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007537 Directories that are not staged into the sysroot by the
7538 :ref:`ref-tasks-populate_sysroot` task. You
7539 can use this variable to exclude certain subdirectories of
7540 directories listed in :term:`SYSROOT_DIRS` from
7541 staging. By default, the following directories are not staged:
7542 ::
7543
7544 SYSROOT_DIRS_BLACKLIST = " \
7545 ${mandir} \
7546 ${docdir} \
7547 ${infodir} \
7548 ${datadir}/locale \
7549 ${datadir}/applications \
7550 ${datadir}/fonts \
7551 ${datadir}/pixmaps \
7552 "
7553
Andrew Geisslerf0343792020-11-18 10:42:21 -06007554 :term:`SYSROOT_DIRS_NATIVE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007555 Extra directories staged into the sysroot by the
7556 :ref:`ref-tasks-populate_sysroot` task for
7557 ``-native`` recipes, in addition to those specified in
7558 :term:`SYSROOT_DIRS`. By default, the following
7559 extra directories are staged:
7560 ::
7561
7562 SYSROOT_DIRS_NATIVE = " \
7563 ${bindir} \
7564 ${sbindir} \
7565 ${base_bindir} \
7566 ${base_sbindir} \
7567 ${libexecdir} \
7568 ${sysconfdir} \
7569 ${localstatedir} \
7570 "
7571
7572 .. note::
7573
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007574 Programs built by ``-native`` recipes run directly from the sysroot
7575 (:term:`STAGING_DIR_NATIVE`), which is why additional directories
7576 containing program executables and supporting files need to be staged.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007577
Andrew Geisslerf0343792020-11-18 10:42:21 -06007578 :term:`SYSROOT_PREPROCESS_FUNCS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007579 A list of functions to execute after files are staged into the
7580 sysroot. These functions are usually used to apply additional
7581 processing on the staged files, or to stage additional files.
7582
Andrew Geisslerf0343792020-11-18 10:42:21 -06007583 :term:`SYSTEMD_AUTO_ENABLE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007584 When inheriting the :ref:`systemd <ref-classes-systemd>` class,
7585 this variable specifies whether the specified service in
7586 :term:`SYSTEMD_SERVICE` should start
7587 automatically or not. By default, the service is enabled to
7588 automatically start at boot time. The default setting is in the
7589 :ref:`systemd <ref-classes-systemd>` class as follows:
7590 ::
7591
7592 SYSTEMD_AUTO_ENABLE ??= "enable"
7593
7594 You can disable the service by setting the variable to "disable".
7595
Andrew Geisslerf0343792020-11-18 10:42:21 -06007596 :term:`SYSTEMD_BOOT_CFG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007597 When :term:`EFI_PROVIDER` is set to
7598 "systemd-boot", the ``SYSTEMD_BOOT_CFG`` variable specifies the
7599 configuration file that should be used. By default, the
7600 :ref:`systemd-boot <ref-classes-systemd-boot>` class sets the
7601 ``SYSTEMD_BOOT_CFG`` as follows:
7602 ::
7603
7604 SYSTEMD_BOOT_CFG ?= "${:term:`S`}/loader.conf"
7605
7606 For information on Systemd-boot, see the `Systemd-boot
Andrew Geissler706d5aa2021-02-12 15:55:30 -06007607 documentation <http://www.freedesktop.org/wiki/Software/systemd/systemd-boot/>`__.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007608
Andrew Geisslerf0343792020-11-18 10:42:21 -06007609 :term:`SYSTEMD_BOOT_ENTRIES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007610 When :term:`EFI_PROVIDER` is set to
7611 "systemd-boot", the ``SYSTEMD_BOOT_ENTRIES`` variable specifies a
7612 list of entry files (``*.conf``) to install that contain one boot
7613 entry per file. By default, the
7614 :ref:`systemd-boot <ref-classes-systemd-boot>` class sets the
7615 ``SYSTEMD_BOOT_ENTRIES`` as follows:
7616 ::
7617
7618 SYSTEMD_BOOT_ENTRIES ?= ""
7619
7620 For information on Systemd-boot, see the `Systemd-boot
Andrew Geissler706d5aa2021-02-12 15:55:30 -06007621 documentation <http://www.freedesktop.org/wiki/Software/systemd/systemd-boot/>`__.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007622
Andrew Geisslerf0343792020-11-18 10:42:21 -06007623 :term:`SYSTEMD_BOOT_TIMEOUT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007624 When :term:`EFI_PROVIDER` is set to
7625 "systemd-boot", the ``SYSTEMD_BOOT_TIMEOUT`` variable specifies the
7626 boot menu timeout in seconds. By default, the
7627 :ref:`systemd-boot <ref-classes-systemd-boot>` class sets the
7628 ``SYSTEMD_BOOT_TIMEOUT`` as follows:
7629 ::
7630
7631 SYSTEMD_BOOT_TIMEOUT ?= "10"
7632
7633 For information on Systemd-boot, see the `Systemd-boot
Andrew Geissler706d5aa2021-02-12 15:55:30 -06007634 documentation <http://www.freedesktop.org/wiki/Software/systemd/systemd-boot/>`__.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007635
Andrew Geisslerf0343792020-11-18 10:42:21 -06007636 :term:`SYSTEMD_PACKAGES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007637 When inheriting the :ref:`systemd <ref-classes-systemd>` class,
7638 this variable locates the systemd unit files when they are not found
7639 in the main recipe's package. By default, the ``SYSTEMD_PACKAGES``
7640 variable is set such that the systemd unit files are assumed to
7641 reside in the recipes main package:
7642 ::
7643
7644 SYSTEMD_PACKAGES ?= "${PN}"
7645
7646 If these unit files are not in this recipe's main package, you need
7647 to use ``SYSTEMD_PACKAGES`` to list the package or packages in which
7648 the build system can find the systemd unit files.
7649
Andrew Geisslerf0343792020-11-18 10:42:21 -06007650 :term:`SYSTEMD_SERVICE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007651 When inheriting the :ref:`systemd <ref-classes-systemd>` class,
7652 this variable specifies the systemd service name for a package.
7653
7654 When you specify this file in your recipe, use a package name
7655 override to indicate the package to which the value applies. Here is
7656 an example from the connman recipe:
7657 ::
7658
7659 SYSTEMD_SERVICE_${PN} = "connman.service"
7660
Andrew Geisslerf0343792020-11-18 10:42:21 -06007661 :term:`SYSVINIT_ENABLED_GETTYS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007662 When using
Andrew Geissler09209ee2020-12-13 08:44:15 -06007663 :ref:`SysVinit <dev-manual/common-tasks:enabling system services>`,
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007664 specifies a space-separated list of the virtual terminals that should
Andrew Geissler706d5aa2021-02-12 15:55:30 -06007665 run a `getty <http://en.wikipedia.org/wiki/Getty_%28Unix%29>`__
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007666 (allowing login), assuming :term:`USE_VT` is not set to
7667 "0".
7668
7669 The default value for ``SYSVINIT_ENABLED_GETTYS`` is "1" (i.e. only
7670 run a getty on the first virtual terminal).
7671
Andrew Geisslerf0343792020-11-18 10:42:21 -06007672 :term:`T`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007673 This variable points to a directory were BitBake places temporary
7674 files, which consist mostly of task logs and scripts, when building a
7675 particular recipe. The variable is typically set as follows:
7676 ::
7677
7678 T = "${WORKDIR}/temp"
7679
7680 The :term:`WORKDIR` is the directory into which
7681 BitBake unpacks and builds the recipe. The default ``bitbake.conf``
7682 file sets this variable.
7683
7684 The ``T`` variable is not to be confused with the
7685 :term:`TMPDIR` variable, which points to the root of
7686 the directory tree where BitBake places the output of an entire
7687 build.
7688
Andrew Geisslerf0343792020-11-18 10:42:21 -06007689 :term:`TARGET_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007690 The target machine's architecture. The OpenEmbedded build system
7691 supports many architectures. Here is an example list of architectures
7692 supported. This list is by no means complete as the architecture is
7693 configurable:
7694
7695 - arm
7696 - i586
7697 - x86_64
7698 - powerpc
7699 - powerpc64
7700 - mips
7701 - mipsel
7702
7703 For additional information on machine architectures, see the
7704 :term:`TUNE_ARCH` variable.
7705
Andrew Geisslerf0343792020-11-18 10:42:21 -06007706 :term:`TARGET_AS_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007707 Specifies architecture-specific assembler flags for the target
7708 system. ``TARGET_AS_ARCH`` is initialized from
7709 :term:`TUNE_ASARGS` by default in the BitBake
7710 configuration file (``meta/conf/bitbake.conf``):
7711 ::
7712
7713 TARGET_AS_ARCH = "${TUNE_ASARGS}"
7714
Andrew Geisslerf0343792020-11-18 10:42:21 -06007715 :term:`TARGET_CC_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007716 Specifies architecture-specific C compiler flags for the target
7717 system. ``TARGET_CC_ARCH`` is initialized from
7718 :term:`TUNE_CCARGS` by default.
7719
7720 .. note::
7721
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007722 It is a common workaround to append :term:`LDFLAGS` to
7723 ``TARGET_CC_ARCH`` in recipes that build software for the target that
7724 would not otherwise respect the exported ``LDFLAGS`` variable.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007725
Andrew Geisslerf0343792020-11-18 10:42:21 -06007726 :term:`TARGET_CC_KERNEL_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007727 This is a specific kernel compiler flag for a CPU or Application
7728 Binary Interface (ABI) tune. The flag is used rarely and only for
7729 cases where a userspace :term:`TUNE_CCARGS` is not
7730 compatible with the kernel compilation. The ``TARGET_CC_KERNEL_ARCH``
7731 variable allows the kernel (and associated modules) to use a
7732 different configuration. See the
7733 ``meta/conf/machine/include/arm/feature-arm-thumb.inc`` file in the
7734 :term:`Source Directory` for an example.
7735
Andrew Geisslerf0343792020-11-18 10:42:21 -06007736 :term:`TARGET_CFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007737 Specifies the flags to pass to the C compiler when building for the
7738 target. When building in the target context,
7739 :term:`CFLAGS` is set to the value of this variable by
7740 default.
7741
7742 Additionally, the SDK's environment setup script sets the ``CFLAGS``
7743 variable in the environment to the ``TARGET_CFLAGS`` value so that
7744 executables built using the SDK also have the flags applied.
7745
Andrew Geisslerf0343792020-11-18 10:42:21 -06007746 :term:`TARGET_CPPFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007747 Specifies the flags to pass to the C pre-processor (i.e. to both the
7748 C and the C++ compilers) when building for the target. When building
7749 in the target context, :term:`CPPFLAGS` is set to the
7750 value of this variable by default.
7751
7752 Additionally, the SDK's environment setup script sets the
7753 ``CPPFLAGS`` variable in the environment to the ``TARGET_CPPFLAGS``
7754 value so that executables built using the SDK also have the flags
7755 applied.
7756
Andrew Geisslerf0343792020-11-18 10:42:21 -06007757 :term:`TARGET_CXXFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007758 Specifies the flags to pass to the C++ compiler when building for the
7759 target. When building in the target context,
7760 :term:`CXXFLAGS` is set to the value of this variable
7761 by default.
7762
7763 Additionally, the SDK's environment setup script sets the
7764 ``CXXFLAGS`` variable in the environment to the ``TARGET_CXXFLAGS``
7765 value so that executables built using the SDK also have the flags
7766 applied.
7767
Andrew Geisslerf0343792020-11-18 10:42:21 -06007768 :term:`TARGET_FPU`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007769 Specifies the method for handling FPU code. For FPU-less targets,
7770 which include most ARM CPUs, the variable must be set to "soft". If
7771 not, the kernel emulation gets used, which results in a performance
7772 penalty.
7773
Andrew Geisslerf0343792020-11-18 10:42:21 -06007774 :term:`TARGET_LD_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007775 Specifies architecture-specific linker flags for the target system.
7776 ``TARGET_LD_ARCH`` is initialized from
7777 :term:`TUNE_LDARGS` by default in the BitBake
7778 configuration file (``meta/conf/bitbake.conf``):
7779 ::
7780
7781 TARGET_LD_ARCH = "${TUNE_LDARGS}"
7782
Andrew Geisslerf0343792020-11-18 10:42:21 -06007783 :term:`TARGET_LDFLAGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007784 Specifies the flags to pass to the linker when building for the
7785 target. When building in the target context,
7786 :term:`LDFLAGS` is set to the value of this variable
7787 by default.
7788
7789 Additionally, the SDK's environment setup script sets the
7790 :term:`LDFLAGS` variable in the environment to the
7791 ``TARGET_LDFLAGS`` value so that executables built using the SDK also
7792 have the flags applied.
7793
Andrew Geisslerf0343792020-11-18 10:42:21 -06007794 :term:`TARGET_OS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007795 Specifies the target's operating system. The variable can be set to
7796 "linux" for glibc-based systems (GNU C Library) and to "linux-musl"
7797 for musl libc. For ARM/EABI targets, "linux-gnueabi" and
7798 "linux-musleabi" possible values exist.
7799
Andrew Geisslerf0343792020-11-18 10:42:21 -06007800 :term:`TARGET_PREFIX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007801 Specifies the prefix used for the toolchain binary target tools.
7802
7803 Depending on the type of recipe and the build target,
7804 ``TARGET_PREFIX`` is set as follows:
7805
7806 - For recipes building for the target machine, the value is
7807 "${:term:`TARGET_SYS`}-".
7808
7809 - For native recipes, the build system sets the variable to the
7810 value of ``BUILD_PREFIX``.
7811
7812 - For native SDK recipes (``nativesdk``), the build system sets the
7813 variable to the value of ``SDK_PREFIX``.
7814
Andrew Geisslerf0343792020-11-18 10:42:21 -06007815 :term:`TARGET_SYS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007816 Specifies the system, including the architecture and the operating
7817 system, for which the build is occurring in the context of the
7818 current recipe.
7819
7820 The OpenEmbedded build system automatically sets this variable based
7821 on :term:`TARGET_ARCH`,
7822 :term:`TARGET_VENDOR`, and
7823 :term:`TARGET_OS` variables.
7824
7825 .. note::
7826
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007827 You do not need to set the ``TARGET_SYS`` variable yourself.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007828
7829 Consider these two examples:
7830
7831 - Given a native recipe on a 32-bit, x86 machine running Linux, the
7832 value is "i686-linux".
7833
7834 - Given a recipe being built for a little-endian, MIPS target
7835 running Linux, the value might be "mipsel-linux".
7836
Andrew Geisslerf0343792020-11-18 10:42:21 -06007837 :term:`TARGET_VENDOR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007838 Specifies the name of the target vendor.
7839
Andrew Geisslerf0343792020-11-18 10:42:21 -06007840 :term:`TCLIBC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007841 Specifies the GNU standard C library (``libc``) variant to use during
7842 the build process. This variable replaces ``POKYLIBC``, which is no
7843 longer supported.
7844
7845 You can select "glibc", "musl", "newlib", or "baremetal"
7846
Andrew Geisslerf0343792020-11-18 10:42:21 -06007847 :term:`TCLIBCAPPEND`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007848 Specifies a suffix to be appended onto the
7849 :term:`TMPDIR` value. The suffix identifies the
7850 ``libc`` variant for building. When you are building for multiple
7851 variants with the same :term:`Build Directory`, this
7852 mechanism ensures that output for different ``libc`` variants is kept
7853 separate to avoid potential conflicts.
7854
7855 In the ``defaultsetup.conf`` file, the default value of
7856 ``TCLIBCAPPEND`` is "-${TCLIBC}". However, distros such as poky,
7857 which normally only support one ``libc`` variant, set
7858 ``TCLIBCAPPEND`` to "" in their distro configuration file resulting
7859 in no suffix being applied.
7860
Andrew Geisslerf0343792020-11-18 10:42:21 -06007861 :term:`TCMODE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007862 Specifies the toolchain selector. ``TCMODE`` controls the
7863 characteristics of the generated packages and images by telling the
7864 OpenEmbedded build system which toolchain profile to use. By default,
7865 the OpenEmbedded build system builds its own internal toolchain. The
7866 variable's default value is "default", which uses that internal
7867 toolchain.
7868
7869 .. note::
7870
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007871 If ``TCMODE`` is set to a value other than "default", then it is your
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007872 responsibility to ensure that the toolchain is compatible with the
7873 default toolchain. Using older or newer versions of these
7874 components might cause build problems. See the Release Notes for
7875 the Yocto Project release for the specific components with which
7876 the toolchain must be compatible. To access the Release Notes, go
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007877 to the :yocto_home:`Downloads </software-overview/downloads>`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007878 page on the Yocto Project website and click on the "RELEASE
7879 INFORMATION" link for the appropriate release.
7880
7881 The ``TCMODE`` variable is similar to :term:`TCLIBC`,
7882 which controls the variant of the GNU standard C library (``libc``)
7883 used during the build process: ``glibc`` or ``musl``.
7884
7885 With additional layers, it is possible to use a pre-compiled external
7886 toolchain. One example is the Sourcery G++ Toolchain. The support for
7887 this toolchain resides in the separate Mentor Graphics
7888 ``meta-sourcery`` layer at
Andrew Geissler706d5aa2021-02-12 15:55:30 -06007889 http://github.com/MentorEmbedded/meta-sourcery/.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007890
7891 The layer's ``README`` file contains information on how to use the
7892 Sourcery G++ Toolchain as an external toolchain. In summary, you must
7893 be sure to add the layer to your ``bblayers.conf`` file in front of
7894 the ``meta`` layer and then set the ``EXTERNAL_TOOLCHAIN`` variable
7895 in your ``local.conf`` file to the location in which you installed
7896 the toolchain.
7897
7898 The fundamentals used for this example apply to any external
7899 toolchain. You can use ``meta-sourcery`` as a template for adding
7900 support for other external toolchains.
7901
Andrew Geisslerf0343792020-11-18 10:42:21 -06007902 :term:`TEST_EXPORT_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007903 The location the OpenEmbedded build system uses to export tests when
7904 the :term:`TEST_EXPORT_ONLY` variable is set
7905 to "1".
7906
7907 The ``TEST_EXPORT_DIR`` variable defaults to
7908 ``"${TMPDIR}/testimage/${PN}"``.
7909
Andrew Geisslerf0343792020-11-18 10:42:21 -06007910 :term:`TEST_EXPORT_ONLY`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007911 Specifies to export the tests only. Set this variable to "1" if you
7912 do not want to run the tests but you want them to be exported in a
7913 manner that you to run them outside of the build system.
7914
Andrew Geisslerf0343792020-11-18 10:42:21 -06007915 :term:`TEST_LOG_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007916 Holds the SSH log and the boot log for QEMU machines. The
7917 ``TEST_LOG_DIR`` variable defaults to ``"${WORKDIR}/testimage"``.
7918
7919 .. note::
7920
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007921 Actual test results reside in the task log (``log.do_testimage``),
7922 which is in the ``${WORKDIR}/temp/`` directory.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007923
Andrew Geisslerf0343792020-11-18 10:42:21 -06007924 :term:`TEST_POWERCONTROL_CMD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007925 For automated hardware testing, specifies the command to use to
7926 control the power of the target machine under test. Typically, this
7927 command would point to a script that performs the appropriate action
7928 (e.g. interacting with a web-enabled power strip). The specified
7929 command should expect to receive as the last argument "off", "on" or
7930 "cycle" specifying to power off, on, or cycle (power off and then
7931 power on) the device, respectively.
7932
Andrew Geisslerf0343792020-11-18 10:42:21 -06007933 :term:`TEST_POWERCONTROL_EXTRA_ARGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007934 For automated hardware testing, specifies additional arguments to
7935 pass through to the command specified in
7936 :term:`TEST_POWERCONTROL_CMD`. Setting
7937 ``TEST_POWERCONTROL_EXTRA_ARGS`` is optional. You can use it if you
7938 wish, for example, to separate the machine-specific and
7939 non-machine-specific parts of the arguments.
7940
Andrew Geisslerf0343792020-11-18 10:42:21 -06007941 :term:`TEST_QEMUBOOT_TIMEOUT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007942 The time in seconds allowed for an image to boot before automated
7943 runtime tests begin to run against an image. The default timeout
7944 period to allow the boot process to reach the login prompt is 500
7945 seconds. You can specify a different value in the ``local.conf``
7946 file.
7947
7948 For more information on testing images, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06007949 ":ref:`dev-manual/common-tasks:performing automated runtime testing`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007950 section in the Yocto Project Development Tasks Manual.
7951
Andrew Geisslerf0343792020-11-18 10:42:21 -06007952 :term:`TEST_SERIALCONTROL_CMD`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007953 For automated hardware testing, specifies the command to use to
7954 connect to the serial console of the target machine under test. This
7955 command simply needs to connect to the serial console and forward
7956 that connection to standard input and output as any normal terminal
7957 program does.
7958
7959 For example, to use the Picocom terminal program on serial device
7960 ``/dev/ttyUSB0`` at 115200bps, you would set the variable as follows:
7961 ::
7962
7963 TEST_SERIALCONTROL_CMD = "picocom /dev/ttyUSB0 -b 115200"
7964
Andrew Geisslerf0343792020-11-18 10:42:21 -06007965 :term:`TEST_SERIALCONTROL_EXTRA_ARGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007966 For automated hardware testing, specifies additional arguments to
7967 pass through to the command specified in
7968 :term:`TEST_SERIALCONTROL_CMD`. Setting
7969 ``TEST_SERIALCONTROL_EXTRA_ARGS`` is optional. You can use it if you
7970 wish, for example, to separate the machine-specific and
7971 non-machine-specific parts of the command.
7972
Andrew Geisslerf0343792020-11-18 10:42:21 -06007973 :term:`TEST_SERVER_IP`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007974 The IP address of the build machine (host machine). This IP address
7975 is usually automatically detected. However, if detection fails, this
7976 variable needs to be set to the IP address of the build machine (i.e.
7977 where the build is taking place).
7978
7979 .. note::
7980
Andrew Geissler4c19ea12020-10-27 13:52:24 -05007981 The ``TEST_SERVER_IP`` variable is only used for a small number of
7982 tests such as the "dnf" test suite, which needs to download packages
7983 from ``WORKDIR/oe-rootfs-repo``.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007984
Andrew Geisslerf0343792020-11-18 10:42:21 -06007985 :term:`TEST_SUITES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05007986 An ordered list of tests (modules) to run against an image when
7987 performing automated runtime testing.
7988
7989 The OpenEmbedded build system provides a core set of tests that can
7990 be used against images.
7991
7992 .. note::
7993
7994 Currently, there is only support for running these tests under
7995 QEMU.
7996
7997 Tests include ``ping``, ``ssh``, ``df`` among others. You can add
7998 your own tests to the list of tests by appending ``TEST_SUITES`` as
7999 follows:
8000 ::
8001
8002 TEST_SUITES_append = " mytest"
8003
8004 Alternatively, you can
8005 provide the "auto" option to have all applicable tests run against
8006 the image.
8007 ::
8008
8009 TEST_SUITES_append = " auto"
8010
8011 Using this option causes the
8012 build system to automatically run tests that are applicable to the
8013 image. Tests that are not applicable are skipped.
8014
8015 The order in which tests are run is important. Tests that depend on
8016 another test must appear later in the list than the test on which
8017 they depend. For example, if you append the list of tests with two
8018 tests (``test_A`` and ``test_B``) where ``test_B`` is dependent on
8019 ``test_A``, then you must order the tests as follows:
8020 ::
8021
8022 TEST_SUITES = "test_A test_B"
8023
8024 For more information on testing images, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008025 ":ref:`dev-manual/common-tasks:performing automated runtime testing`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008026 section in the Yocto Project Development Tasks Manual.
8027
Andrew Geisslerf0343792020-11-18 10:42:21 -06008028 :term:`TEST_TARGET`
8029 Specifies the target controller to use when running tests against a
8030 test image. The default controller to use is "qemu":
8031 ::
8032
8033 TEST_TARGET = "qemu"
8034
8035 A target controller is a class that defines how an image gets
8036 deployed on a target and how a target is started. A layer can extend
8037 the controllers by adding a module in the layer's
8038 ``/lib/oeqa/controllers`` directory and by inheriting the
8039 ``BaseTarget`` class, which is an abstract class that cannot be used
8040 as a value of ``TEST_TARGET``.
8041
8042 You can provide the following arguments with ``TEST_TARGET``:
8043
8044 - *"qemu":* Boots a QEMU image and runs the tests. See the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008045 ":ref:`dev-manual/common-tasks:enabling runtime tests on qemu`" section
Andrew Geisslerf0343792020-11-18 10:42:21 -06008046 in the Yocto Project Development Tasks Manual for more
8047 information.
8048
8049 - *"simpleremote":* Runs the tests on target hardware that is
8050 already up and running. The hardware can be on the network or it
8051 can be a device running an image on QEMU. You must also set
8052 :term:`TEST_TARGET_IP` when you use
8053 "simpleremote".
8054
8055 .. note::
8056
8057 This argument is defined in
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008058 ``meta/lib/oeqa/controllers/simpleremote.py``.
Andrew Geisslerf0343792020-11-18 10:42:21 -06008059
8060 For information on running tests on hardware, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008061 ":ref:`dev-manual/common-tasks:enabling runtime tests on hardware`"
Andrew Geisslerf0343792020-11-18 10:42:21 -06008062 section in the Yocto Project Development Tasks Manual.
8063
8064 :term:`TEST_TARGET_IP`
8065 The IP address of your hardware under test. The ``TEST_TARGET_IP``
8066 variable has no effect when :term:`TEST_TARGET` is
8067 set to "qemu".
8068
8069 When you specify the IP address, you can also include a port. Here is
8070 an example:
8071 ::
8072
8073 TEST_TARGET_IP = "192.168.1.4:2201"
8074
8075 Specifying a port is
8076 useful when SSH is started on a non-standard port or in cases when
8077 your hardware under test is behind a firewall or network that is not
8078 directly accessible from your host and you need to do port address
8079 translation.
8080
8081 :term:`TESTIMAGE_AUTO`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008082 Automatically runs the series of automated tests for images when an
8083 image is successfully built. Setting ``TESTIMAGE_AUTO`` to "1" causes
8084 any image that successfully builds to automatically boot under QEMU.
8085 Using the variable also adds in dependencies so that any SDK for
8086 which testing is requested is automatically built first.
8087
8088 These tests are written in Python making use of the ``unittest``
8089 module, and the majority of them run commands on the target system
8090 over ``ssh``. You can set this variable to "1" in your ``local.conf``
8091 file in the :term:`Build Directory` to have the
8092 OpenEmbedded build system automatically run these tests after an
8093 image successfully builds:
8094
8095 TESTIMAGE_AUTO = "1"
8096
8097 For more information
8098 on enabling, running, and writing these tests, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008099 ":ref:`dev-manual/common-tasks:performing automated runtime testing`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008100 section in the Yocto Project Development Tasks Manual and the
8101 ":ref:`testimage*.bbclass <ref-classes-testimage*>`" section.
8102
Andrew Geisslerf0343792020-11-18 10:42:21 -06008103 :term:`THISDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008104 The directory in which the file BitBake is currently parsing is
8105 located. Do not manually set this variable.
8106
Andrew Geisslerf0343792020-11-18 10:42:21 -06008107 :term:`TIME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008108 The time the build was started. Times appear using the hour, minute,
8109 and second (HMS) format (e.g. "140159" for one minute and fifty-nine
8110 seconds past 1400 hours).
8111
Andrew Geisslerf0343792020-11-18 10:42:21 -06008112 :term:`TMPDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008113 This variable is the base directory the OpenEmbedded build system
8114 uses for all build output and intermediate files (other than the
8115 shared state cache). By default, the ``TMPDIR`` variable points to
8116 ``tmp`` within the :term:`Build Directory`.
8117
8118 If you want to establish this directory in a location other than the
8119 default, you can uncomment and edit the following statement in the
8120 ``conf/local.conf`` file in the :term:`Source Directory`:
8121 ::
8122
8123 #TMPDIR = "${TOPDIR}/tmp"
8124
8125 An example use for this scenario is to set ``TMPDIR`` to a local disk,
8126 which does not use NFS, while having the Build Directory use NFS.
8127
8128 The filesystem used by ``TMPDIR`` must have standard filesystem
8129 semantics (i.e. mixed-case files are unique, POSIX file locking, and
8130 persistent inodes). Due to various issues with NFS and bugs in some
8131 implementations, NFS does not meet this minimum requirement.
8132 Consequently, ``TMPDIR`` cannot be on NFS.
8133
Andrew Geisslerf0343792020-11-18 10:42:21 -06008134 :term:`TOOLCHAIN_HOST_TASK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008135 This variable lists packages the OpenEmbedded build system uses when
8136 building an SDK, which contains a cross-development environment. The
8137 packages specified by this variable are part of the toolchain set
8138 that runs on the :term:`SDKMACHINE`, and each
8139 package should usually have the prefix ``nativesdk-``. For example,
8140 consider the following command when building an SDK:
8141 ::
8142
8143 $ bitbake -c populate_sdk imagename
8144
8145 In this case, a default list of packages is
8146 set in this variable, but you can add additional packages to the
8147 list. See the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008148 ":ref:`sdk-manual/appendix-customizing-standard:adding individual packages to the standard sdk`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008149 in the Yocto Project Application Development and the Extensible
8150 Software Development Kit (eSDK) manual for more information.
8151
8152 For background information on cross-development toolchains in the
8153 Yocto Project development environment, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008154 ":ref:`sdk-manual/intro:the cross-development toolchain`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008155 section in the Yocto Project Overview and Concepts Manual. For
8156 information on setting up a cross-development environment, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008157 :doc:`/sdk-manual/index` manual.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008158
Andrew Geisslerf0343792020-11-18 10:42:21 -06008159 :term:`TOOLCHAIN_OUTPUTNAME`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008160 This variable defines the name used for the toolchain output. The
8161 :ref:`populate_sdk_base <ref-classes-populate-sdk-*>` class sets
8162 the ``TOOLCHAIN_OUTPUTNAME`` variable as follows:
8163 ::
8164
8165 TOOLCHAIN_OUTPUTNAME ?= "${SDK_NAME}-toolchain-${SDK_VERSION}"
8166
8167 See
8168 the :term:`SDK_NAME` and
8169 :term:`SDK_VERSION` variables for additional
8170 information.
8171
Andrew Geisslerf0343792020-11-18 10:42:21 -06008172 :term:`TOOLCHAIN_TARGET_TASK`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008173 This variable lists packages the OpenEmbedded build system uses when
8174 it creates the target part of an SDK (i.e. the part built for the
8175 target hardware), which includes libraries and headers. Use this
8176 variable to add individual packages to the part of the SDK that runs
8177 on the target. See the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008178 ":ref:`sdk-manual/appendix-customizing-standard:adding individual packages to the standard sdk`" section
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008179 in the Yocto Project Application Development and the Extensible
8180 Software Development Kit (eSDK) manual for more information.
8181
8182 For background information on cross-development toolchains in the
8183 Yocto Project development environment, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008184 ":ref:`sdk-manual/intro:the cross-development toolchain`"
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008185 section in the Yocto Project Overview and Concepts Manual. For
8186 information on setting up a cross-development environment, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008187 :doc:`/sdk-manual/index` manual.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008188
Andrew Geisslerf0343792020-11-18 10:42:21 -06008189 :term:`TOPDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008190 The top-level :term:`Build Directory`. BitBake
8191 automatically sets this variable when you initialize your build
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008192 environment using :ref:`structure-core-script`.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008193
Andrew Geisslerf0343792020-11-18 10:42:21 -06008194 :term:`TRANSLATED_TARGET_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008195 A sanitized version of :term:`TARGET_ARCH`. This
8196 variable is used where the architecture is needed in a value where
8197 underscores are not allowed, for example within package filenames. In
8198 this case, dash characters replace any underscore characters used in
8199 ``TARGET_ARCH``.
8200
8201 Do not edit this variable.
8202
Andrew Geisslerf0343792020-11-18 10:42:21 -06008203 :term:`TUNE_ARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008204 The GNU canonical architecture for a specific architecture (i.e.
8205 ``arm``, ``armeb``, ``mips``, ``mips64``, and so forth). BitBake uses
8206 this value to setup configuration.
8207
8208 ``TUNE_ARCH`` definitions are specific to a given architecture. The
8209 definitions can be a single static definition, or can be dynamically
8210 adjusted. You can see details for a given CPU family by looking at
8211 the architecture's ``README`` file. For example, the
8212 ``meta/conf/machine/include/mips/README`` file in the
8213 :term:`Source Directory` provides information for
8214 ``TUNE_ARCH`` specific to the ``mips`` architecture.
8215
8216 ``TUNE_ARCH`` is tied closely to
8217 :term:`TARGET_ARCH`, which defines the target
8218 machine's architecture. The BitBake configuration file
8219 (``meta/conf/bitbake.conf``) sets ``TARGET_ARCH`` as follows:
8220 ::
8221
8222 TARGET_ARCH = "${TUNE_ARCH}"
8223
8224 The following list, which is by no means complete since architectures
8225 are configurable, shows supported machine architectures:
8226
8227 - arm
8228 - i586
8229 - x86_64
8230 - powerpc
8231 - powerpc64
8232 - mips
8233 - mipsel
8234
Andrew Geisslerf0343792020-11-18 10:42:21 -06008235 :term:`TUNE_ASARGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008236 Specifies architecture-specific assembler flags for the target
8237 system. The set of flags is based on the selected tune features.
8238 ``TUNE_ASARGS`` is set using the tune include files, which are
8239 typically under ``meta/conf/machine/include/`` and are influenced
8240 through :term:`TUNE_FEATURES`. For example, the
8241 ``meta/conf/machine/include/x86/arch-x86.inc`` file defines the flags
8242 for the x86 architecture as follows:
8243 ::
8244
8245 TUNE_ASARGS += "${@bb.utils.contains("TUNE_FEATURES", "mx32", "-x32", "", d)}"
8246
8247 .. note::
8248
8249 Board Support Packages (BSPs) select the tune. The selected tune,
8250 in turn, affects the tune variables themselves (i.e. the tune can
8251 supply its own set of flags).
8252
Andrew Geisslerf0343792020-11-18 10:42:21 -06008253 :term:`TUNE_CCARGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008254 Specifies architecture-specific C compiler flags for the target
8255 system. The set of flags is based on the selected tune features.
8256 ``TUNE_CCARGS`` is set using the tune include files, which are
8257 typically under ``meta/conf/machine/include/`` and are influenced
8258 through :term:`TUNE_FEATURES`.
8259
8260 .. note::
8261
8262 Board Support Packages (BSPs) select the tune. The selected tune,
8263 in turn, affects the tune variables themselves (i.e. the tune can
8264 supply its own set of flags).
8265
Andrew Geisslerf0343792020-11-18 10:42:21 -06008266 :term:`TUNE_FEATURES`
8267 Features used to "tune" a compiler for optimal use given a specific
8268 processor. The features are defined within the tune files and allow
8269 arguments (i.e. ``TUNE_*ARGS``) to be dynamically generated based on
8270 the features.
8271
8272 The OpenEmbedded build system verifies the features to be sure they
8273 are not conflicting and that they are supported.
8274
8275 The BitBake configuration file (``meta/conf/bitbake.conf``) defines
8276 ``TUNE_FEATURES`` as follows:
8277 ::
8278
8279 TUNE_FEATURES ??= "${TUNE_FEATURES_tune-${DEFAULTTUNE}}"
8280
8281 See the :term:`DEFAULTTUNE` variable for more information.
8282
8283 :term:`TUNE_LDARGS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008284 Specifies architecture-specific linker flags for the target system.
8285 The set of flags is based on the selected tune features.
8286 ``TUNE_LDARGS`` is set using the tune include files, which are
8287 typically under ``meta/conf/machine/include/`` and are influenced
8288 through :term:`TUNE_FEATURES`. For example, the
8289 ``meta/conf/machine/include/x86/arch-x86.inc`` file defines the flags
8290 for the x86 architecture as follows:
8291 ::
8292
8293 TUNE_LDARGS += "${@bb.utils.contains("TUNE_FEATURES", "mx32", "-m elf32_x86_64", "", d)}"
8294
8295 .. note::
8296
8297 Board Support Packages (BSPs) select the tune. The selected tune,
8298 in turn, affects the tune variables themselves (i.e. the tune can
8299 supply its own set of flags).
8300
Andrew Geisslerf0343792020-11-18 10:42:21 -06008301 :term:`TUNE_PKGARCH`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008302 The package architecture understood by the packaging system to define
8303 the architecture, ABI, and tuning of output packages. The specific
8304 tune is defined using the "_tune" override as follows:
8305 ::
8306
8307 TUNE_PKGARCH_tune-tune = "tune"
8308
8309 These tune-specific package architectures are defined in the machine
8310 include files. Here is an example of the "core2-32" tuning as used in
8311 the ``meta/conf/machine/include/tune-core2.inc`` file:
8312 ::
8313
8314 TUNE_PKGARCH_tune-core2-32 = "core2-32"
8315
Andrew Geisslerf0343792020-11-18 10:42:21 -06008316 :term:`TUNEABI`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008317 An underlying Application Binary Interface (ABI) used by a particular
8318 tuning in a given toolchain layer. Providers that use prebuilt
8319 libraries can use the ``TUNEABI``,
8320 :term:`TUNEABI_OVERRIDE`, and
8321 :term:`TUNEABI_WHITELIST` variables to check
8322 compatibility of tunings against their selection of libraries.
8323
8324 If ``TUNEABI`` is undefined, then every tuning is allowed. See the
8325 :ref:`sanity <ref-classes-sanity>` class to see how the variable is
8326 used.
8327
Andrew Geisslerf0343792020-11-18 10:42:21 -06008328 :term:`TUNEABI_OVERRIDE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008329 If set, the OpenEmbedded system ignores the
8330 :term:`TUNEABI_WHITELIST` variable.
8331 Providers that use prebuilt libraries can use the
8332 ``TUNEABI_OVERRIDE``, ``TUNEABI_WHITELIST``, and
8333 :term:`TUNEABI` variables to check compatibility of a
8334 tuning against their selection of libraries.
8335
8336 See the :ref:`sanity <ref-classes-sanity>` class to see how the
8337 variable is used.
8338
Andrew Geisslerf0343792020-11-18 10:42:21 -06008339 :term:`TUNEABI_WHITELIST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008340 A whitelist of permissible :term:`TUNEABI` values. If
8341 ``TUNEABI_WHITELIST`` is not set, all tunes are allowed. Providers
8342 that use prebuilt libraries can use the ``TUNEABI_WHITELIST``,
8343 :term:`TUNEABI_OVERRIDE`, and ``TUNEABI``
8344 variables to check compatibility of a tuning against their selection
8345 of libraries.
8346
8347 See the :ref:`sanity <ref-classes-sanity>` class to see how the
8348 variable is used.
8349
Andrew Geisslerf0343792020-11-18 10:42:21 -06008350 :term:`TUNECONFLICTS[feature]`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008351 Specifies CPU or Application Binary Interface (ABI) tuning features
8352 that conflict with feature.
8353
8354 Known tuning conflicts are specified in the machine include files in
8355 the :term:`Source Directory`. Here is an example from
8356 the ``meta/conf/machine/include/mips/arch-mips.inc`` include file
8357 that lists the "o32" and "n64" features as conflicting with the "n32"
8358 feature:
8359 ::
8360
8361 TUNECONFLICTS[n32] = "o32 n64"
8362
Andrew Geisslerf0343792020-11-18 10:42:21 -06008363 :term:`TUNEVALID[feature]`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008364 Specifies a valid CPU or Application Binary Interface (ABI) tuning
8365 feature. The specified feature is stored as a flag. Valid features
8366 are specified in the machine include files (e.g.
8367 ``meta/conf/machine/include/arm/arch-arm.inc``). Here is an example
8368 from that file:
8369 ::
8370
8371 TUNEVALID[bigendian] = "Enable big-endian mode."
8372
8373 See the machine include files in the :term:`Source Directory`
8374 for these features.
8375
Andrew Geisslerf0343792020-11-18 10:42:21 -06008376 :term:`UBOOT_CONFIG`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008377 Configures the :term:`UBOOT_MACHINE` and can
8378 also define :term:`IMAGE_FSTYPES` for individual
8379 cases.
8380
8381 Following is an example from the ``meta-fsl-arm`` layer. ::
8382
8383 UBOOT_CONFIG ??= "sd"
8384 UBOOT_CONFIG[sd] = "mx6qsabreauto_config,sdcard"
8385 UBOOT_CONFIG[eimnor] = "mx6qsabreauto_eimnor_config"
8386 UBOOT_CONFIG[nand] = "mx6qsabreauto_nand_config,ubifs"
8387 UBOOT_CONFIG[spinor] = "mx6qsabreauto_spinor_config"
8388
8389 In this example, "sd" is selected as the configuration of the possible four for the
8390 ``UBOOT_MACHINE``. The "sd" configuration defines
8391 "mx6qsabreauto_config" as the value for ``UBOOT_MACHINE``, while the
Andrew Geissler706d5aa2021-02-12 15:55:30 -06008392 "sdcard" specifies the ``IMAGE_FSTYPES`` to use for the U-boot image.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008393
8394 For more information on how the ``UBOOT_CONFIG`` is handled, see the
8395 :ref:`uboot-config <ref-classes-uboot-config>`
8396 class.
8397
Andrew Geisslerf0343792020-11-18 10:42:21 -06008398 :term:`UBOOT_DTB_LOADADDRESS`
Andrew Geissler706d5aa2021-02-12 15:55:30 -06008399 Specifies the load address for the dtb image used by U-boot. During FIT
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008400 image creation, the ``UBOOT_DTB_LOADADDRESS`` variable is used in
8401 :ref:`kernel-fitimage <ref-classes-kernel-fitimage>` class to specify
8402 the load address to be used in
8403 creating the dtb sections of Image Tree Source for the FIT image.
8404
Andrew Geisslerf0343792020-11-18 10:42:21 -06008405 :term:`UBOOT_DTBO_LOADADDRESS`
Andrew Geissler706d5aa2021-02-12 15:55:30 -06008406 Specifies the load address for the dtbo image used by U-boot. During FIT
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008407 image creation, the ``UBOOT_DTBO_LOADADDRESS`` variable is used in
8408 :ref:`kernel-fitimage <ref-classes-kernel-fitimage>` class to specify the load address to be used in
8409 creating the dtbo sections of Image Tree Source for the FIT image.
8410
Andrew Geisslerf0343792020-11-18 10:42:21 -06008411 :term:`UBOOT_ENTRYPOINT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008412 Specifies the entry point for the U-Boot image. During U-Boot image
8413 creation, the ``UBOOT_ENTRYPOINT`` variable is passed as a
8414 command-line parameter to the ``uboot-mkimage`` utility.
8415
Andrew Geisslerf0343792020-11-18 10:42:21 -06008416 :term:`UBOOT_LOADADDRESS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008417 Specifies the load address for the U-Boot image. During U-Boot image
8418 creation, the ``UBOOT_LOADADDRESS`` variable is passed as a
8419 command-line parameter to the ``uboot-mkimage`` utility.
8420
Andrew Geisslerf0343792020-11-18 10:42:21 -06008421 :term:`UBOOT_LOCALVERSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008422 Appends a string to the name of the local version of the U-Boot
8423 image. For example, assuming the version of the U-Boot image built
8424 was "2013.10", the full version string reported by U-Boot would be
8425 "2013.10-yocto" given the following statement:
8426 ::
8427
8428 UBOOT_LOCALVERSION = "-yocto"
8429
Andrew Geisslerf0343792020-11-18 10:42:21 -06008430 :term:`UBOOT_MACHINE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008431 Specifies the value passed on the ``make`` command line when building
8432 a U-Boot image. The value indicates the target platform
8433 configuration. You typically set this variable from the machine
8434 configuration file (i.e. ``conf/machine/machine_name.conf``).
8435
8436 Please see the "Selection of Processor Architecture and Board Type"
8437 section in the U-Boot README for valid values for this variable.
8438
Andrew Geisslerf0343792020-11-18 10:42:21 -06008439 :term:`UBOOT_MAKE_TARGET`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008440 Specifies the target called in the ``Makefile``. The default target
8441 is "all".
8442
Andrew Geisslerf0343792020-11-18 10:42:21 -06008443 :term:`UBOOT_MKIMAGE_DTCOPTS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008444 Options for the device tree compiler passed to mkimage '-D'
8445 feature while creating FIT image in :ref:`kernel-fitimage <ref-classes-kernel-fitimage>` class.
8446
Andrew Geisslerf0343792020-11-18 10:42:21 -06008447 :term:`UBOOT_RD_ENTRYPOINT`
Andrew Geissler4873add2020-11-02 18:44:49 -06008448 Specifies the entrypoint for the RAM disk image.
8449 During FIT image creation, the
8450 ``UBOOT_RD_ENTRYPOINT`` variable is used
8451 in :ref:`kernel-fitimage <ref-classes-kernel-fitimage>` class to specify the
8452 entrypoint to be used in creating the Image Tree Source for
8453 the FIT image.
8454
Andrew Geisslerf0343792020-11-18 10:42:21 -06008455 :term:`UBOOT_RD_LOADADDRESS`
8456 Specifies the load address for the RAM disk image.
8457 During FIT image creation, the
8458 ``UBOOT_RD_LOADADDRESS`` variable is used
8459 in :ref:`kernel-fitimage <ref-classes-kernel-fitimage>` class to specify the
8460 load address to be used in creating the Image Tree Source for
8461 the FIT image.
8462
8463 :term:`UBOOT_SIGN_ENABLE`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008464 Enable signing of FIT image. The default value is "0".
8465
Andrew Geisslerf0343792020-11-18 10:42:21 -06008466 :term:`UBOOT_SIGN_KEYDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008467 Location of the directory containing the RSA key and
8468 certificate used for signing FIT image.
8469
Andrew Geisslerf0343792020-11-18 10:42:21 -06008470 :term:`UBOOT_SIGN_KEYNAME`
Andrew Geissler706d5aa2021-02-12 15:55:30 -06008471 The name of keys used for signing U-boot FIT image stored in
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008472 :term:`UBOOT_SIGN_KEYDIR` directory. For e.g. dev.key key and dev.crt
8473 certificate stored in :term:`UBOOT_SIGN_KEYDIR` directory will have
8474 :term:`UBOOT_SIGN_KEYNAME` set to "dev".
8475
Andrew Geisslerf0343792020-11-18 10:42:21 -06008476 :term:`UBOOT_SUFFIX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008477 Points to the generated U-Boot extension. For example, ``u-boot.sb``
8478 has a ``.sb`` extension.
8479
8480 The default U-Boot extension is ``.bin``
8481
Andrew Geisslerf0343792020-11-18 10:42:21 -06008482 :term:`UBOOT_TARGET`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008483 Specifies the target used for building U-Boot. The target is passed
8484 directly as part of the "make" command (e.g. SPL and AIS). If you do
8485 not specifically set this variable, the OpenEmbedded build process
8486 passes and uses "all" for the target during the U-Boot building
8487 process.
8488
Andrew Geisslerf0343792020-11-18 10:42:21 -06008489 :term:`UNKNOWN_CONFIGURE_WHITELIST`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008490 Specifies a list of options that, if reported by the configure script
8491 as being invalid, should not generate a warning during the
8492 :ref:`ref-tasks-configure` task. Normally, invalid
8493 configure options are simply not passed to the configure script (e.g.
8494 should be removed from :term:`EXTRA_OECONF` or
8495 :term:`PACKAGECONFIG_CONFARGS`).
8496 However, common options, for example, exist that are passed to all
8497 configure scripts at a class level that might not be valid for some
8498 configure scripts. It follows that no benefit exists in seeing a
8499 warning about these options. For these cases, the options are added
8500 to ``UNKNOWN_CONFIGURE_WHITELIST``.
8501
8502 The configure arguments check that uses
8503 ``UNKNOWN_CONFIGURE_WHITELIST`` is part of the
8504 :ref:`insane <ref-classes-insane>` class and is only enabled if the
8505 recipe inherits the :ref:`autotools <ref-classes-autotools>` class.
8506
Andrew Geisslerf0343792020-11-18 10:42:21 -06008507 :term:`UPDATERCPN`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008508 For recipes inheriting the
8509 :ref:`update-rc.d <ref-classes-update-rc.d>` class, ``UPDATERCPN``
8510 specifies the package that contains the initscript that is enabled.
8511
8512 The default value is "${PN}". Given that almost all recipes that
8513 install initscripts package them in the main package for the recipe,
8514 you rarely need to set this variable in individual recipes.
8515
Andrew Geisslerf0343792020-11-18 10:42:21 -06008516 :term:`UPSTREAM_CHECK_GITTAGREGEX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008517 You can perform a per-recipe check for what the latest upstream
8518 source code version is by calling ``bitbake -c checkpkg`` recipe. If
8519 the recipe source code is provided from Git repositories, the
8520 OpenEmbedded build system determines the latest upstream version by
8521 picking the latest tag from the list of all repository tags.
8522
8523 You can use the ``UPSTREAM_CHECK_GITTAGREGEX`` variable to provide a
8524 regular expression to filter only the relevant tags should the
8525 default filter not work correctly.
8526 ::
8527
8528 UPSTREAM_CHECK_GITTAGREGEX = "git_tag_regex"
8529
Andrew Geisslerf0343792020-11-18 10:42:21 -06008530 :term:`UPSTREAM_CHECK_REGEX`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008531 Use the ``UPSTREAM_CHECK_REGEX`` variable to specify a different
8532 regular expression instead of the default one when the package
8533 checking system is parsing the page found using
8534 :term:`UPSTREAM_CHECK_URI`.
8535 ::
8536
8537 UPSTREAM_CHECK_REGEX = "package_regex"
8538
Andrew Geisslerf0343792020-11-18 10:42:21 -06008539 :term:`UPSTREAM_CHECK_URI`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008540 You can perform a per-recipe check for what the latest upstream
8541 source code version is by calling ``bitbake -c checkpkg`` recipe. If
8542 the source code is provided from tarballs, the latest version is
8543 determined by fetching the directory listing where the tarball is and
8544 attempting to find a later tarball. When this approach does not work,
8545 you can use ``UPSTREAM_CHECK_URI`` to provide a different URI that
8546 contains the link to the latest tarball.
8547 ::
8548
8549 UPSTREAM_CHECK_URI = "recipe_url"
8550
Andrew Geisslerf0343792020-11-18 10:42:21 -06008551 :term:`USE_DEVFS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008552 Determines if ``devtmpfs`` is used for ``/dev`` population. The
8553 default value used for ``USE_DEVFS`` is "1" when no value is
8554 specifically set. Typically, you would set ``USE_DEVFS`` to "0" for a
8555 statically populated ``/dev`` directory.
8556
Andrew Geissler09209ee2020-12-13 08:44:15 -06008557 See the ":ref:`dev-manual/common-tasks:selecting a device manager`" section in
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008558 the Yocto Project Development Tasks Manual for information on how to
8559 use this variable.
8560
Andrew Geisslerf0343792020-11-18 10:42:21 -06008561 :term:`USE_VT`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008562 When using
Andrew Geissler09209ee2020-12-13 08:44:15 -06008563 :ref:`SysVinit <dev-manual/common-tasks:enabling system services>`,
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008564 determines whether or not to run a
Andrew Geissler706d5aa2021-02-12 15:55:30 -06008565 `getty <http://en.wikipedia.org/wiki/Getty_%28Unix%29>`__ on any
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008566 virtual terminals in order to enable logging in through those
8567 terminals.
8568
8569 The default value used for ``USE_VT`` is "1" when no default value is
8570 specifically set. Typically, you would set ``USE_VT`` to "0" in the
8571 machine configuration file for machines that do not have a graphical
8572 display attached and therefore do not need virtual terminal
8573 functionality.
8574
Andrew Geisslerf0343792020-11-18 10:42:21 -06008575 :term:`USER_CLASSES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008576 A list of classes to globally inherit. These classes are used by the
8577 OpenEmbedded build system to enable extra features (e.g.
8578 ``buildstats``, ``image-mklibs``, and so forth).
8579
8580 The default list is set in your ``local.conf`` file:
8581 ::
8582
8583 USER_CLASSES ?= "buildstats image-mklibs image-prelink"
8584
8585 For more information, see
8586 ``meta-poky/conf/local.conf.sample`` in the :term:`Source Directory`.
8587
Andrew Geisslerf0343792020-11-18 10:42:21 -06008588 :term:`USERADD_ERROR_DYNAMIC`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008589 If set to ``error``, forces the OpenEmbedded build system to produce
8590 an error if the user identification (``uid``) and group
8591 identification (``gid``) values are not defined in any of the files
8592 listed in :term:`USERADD_UID_TABLES` and
8593 :term:`USERADD_GID_TABLES`. If set to
8594 ``warn``, a warning will be issued instead.
8595
8596 The default behavior for the build system is to dynamically apply
8597 ``uid`` and ``gid`` values. Consequently, the
8598 ``USERADD_ERROR_DYNAMIC`` variable is by default not set. If you plan
8599 on using statically assigned ``gid`` and ``uid`` values, you should
8600 set the ``USERADD_ERROR_DYNAMIC`` variable in your ``local.conf``
8601 file as follows:
8602 ::
8603
8604 USERADD_ERROR_DYNAMIC = "error"
8605
8606 Overriding the
8607 default behavior implies you are going to also take steps to set
8608 static ``uid`` and ``gid`` values through use of the
8609 :term:`USERADDEXTENSION`,
8610 :term:`USERADD_UID_TABLES`, and
8611 :term:`USERADD_GID_TABLES` variables.
8612
8613 .. note::
8614
8615 There is a difference in behavior between setting
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008616 ``USERADD_ERROR_DYNAMIC`` to ``error`` and setting it to ``warn``.
8617 When it is set to ``warn``, the build system will report a warning for
8618 every undefined ``uid`` and ``gid`` in any recipe. But when it is set
8619 to ``error``, it will only report errors for recipes that are actually
8620 built.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008621 This saves you from having to add static IDs for recipes that you
8622 know will never be built.
8623
Andrew Geisslerf0343792020-11-18 10:42:21 -06008624 :term:`USERADD_GID_TABLES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008625 Specifies a password file to use for obtaining static group
8626 identification (``gid``) values when the OpenEmbedded build system
8627 adds a group to the system during package installation.
8628
8629 When applying static group identification (``gid``) values, the
8630 OpenEmbedded build system looks in :term:`BBPATH` for a
8631 ``files/group`` file and then applies those ``uid`` values. Set the
8632 variable as follows in your ``local.conf`` file:
8633 ::
8634
8635
8636 USERADD_GID_TABLES = "files/group"
8637
8638 .. note::
8639
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008640 Setting the :term:`USERADDEXTENSION` variable to "useradd-staticids"
8641 causes the build system to use static ``gid`` values.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008642
Andrew Geisslerf0343792020-11-18 10:42:21 -06008643 :term:`USERADD_PACKAGES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008644 When inheriting the :ref:`useradd <ref-classes-useradd>` class,
8645 this variable specifies the individual packages within the recipe
8646 that require users and/or groups to be added.
8647
8648 You must set this variable if the recipe inherits the class. For
8649 example, the following enables adding a user for the main package in
8650 a recipe:
8651 ::
8652
8653 USERADD_PACKAGES = "${PN}"
8654
8655 .. note::
8656
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008657 It follows that if you are going to use the ``USERADD_PACKAGES``
8658 variable, you need to set one or more of the :term:`USERADD_PARAM`,
8659 :term:`GROUPADD_PARAM`, or :term:`GROUPMEMS_PARAM` variables.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008660
Andrew Geisslerf0343792020-11-18 10:42:21 -06008661 :term:`USERADD_PARAM`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008662 When inheriting the :ref:`useradd <ref-classes-useradd>` class,
8663 this variable specifies for a package what parameters should pass to
8664 the ``useradd`` command if you add a user to the system when the
8665 package is installed.
8666
8667 Here is an example from the ``dbus`` recipe:
8668 ::
8669
8670 USERADD_PARAM_${PN} = "--system --home ${localstatedir}/lib/dbus \
8671 --no-create-home --shell /bin/false \
8672 --user-group messagebus"
8673
8674 For information on the
8675 standard Linux shell command ``useradd``, see
Andrew Geissler706d5aa2021-02-12 15:55:30 -06008676 http://linux.die.net/man/8/useradd.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008677
Andrew Geisslerf0343792020-11-18 10:42:21 -06008678 :term:`USERADD_UID_TABLES`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008679 Specifies a password file to use for obtaining static user
8680 identification (``uid``) values when the OpenEmbedded build system
8681 adds a user to the system during package installation.
8682
8683 When applying static user identification (``uid``) values, the
8684 OpenEmbedded build system looks in :term:`BBPATH` for a
8685 ``files/passwd`` file and then applies those ``uid`` values. Set the
8686 variable as follows in your ``local.conf`` file:
8687 ::
8688
8689 USERADD_UID_TABLES = "files/passwd"
8690
8691 .. note::
8692
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008693 Setting the :term:`USERADDEXTENSION` variable to "useradd-staticids"
8694 causes the build system to use static ``uid`` values.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008695
Andrew Geisslerf0343792020-11-18 10:42:21 -06008696 :term:`USERADDEXTENSION`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008697 When set to "useradd-staticids", causes the OpenEmbedded build system
8698 to base all user and group additions on a static ``passwd`` and
8699 ``group`` files found in :term:`BBPATH`.
8700
8701 To use static user identification (``uid``) and group identification
8702 (``gid``) values, set the variable as follows in your ``local.conf``
8703 file: USERADDEXTENSION = "useradd-staticids"
8704
8705 .. note::
8706
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008707 Setting this variable to use static ``uid`` and ``gid``
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008708 values causes the OpenEmbedded build system to employ the
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008709 :ref:`ref-classes-useradd` class.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008710
8711 If you use static ``uid`` and ``gid`` information, you must also
8712 specify the ``files/passwd`` and ``files/group`` files by setting the
8713 :term:`USERADD_UID_TABLES` and
8714 :term:`USERADD_GID_TABLES` variables.
8715 Additionally, you should also set the
8716 :term:`USERADD_ERROR_DYNAMIC` variable.
8717
Andrew Geisslerf0343792020-11-18 10:42:21 -06008718 :term:`VOLATILE_LOG_DIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008719 Specifies the persistence of the target's ``/var/log`` directory,
8720 which is used to house postinstall target log files.
8721
8722 By default, ``VOLATILE_LOG_DIR`` is set to "yes", which means the
8723 file is not persistent. You can override this setting by setting the
8724 variable to "no" to make the log directory persistent.
8725
Andrew Geisslerf0343792020-11-18 10:42:21 -06008726 :term:`WARN_QA`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008727 Specifies the quality assurance checks whose failures are reported as
8728 warnings by the OpenEmbedded build system. You set this variable in
8729 your distribution configuration file. For a list of the checks you
8730 can control with this variable, see the
8731 ":ref:`insane.bbclass <ref-classes-insane>`" section.
8732
Andrew Geisslerf0343792020-11-18 10:42:21 -06008733 :term:`WKS_FILE`
8734 Specifies the location of the Wic kickstart file that is used by the
8735 OpenEmbedded build system to create a partitioned image
8736 (image\ ``.wic``). For information on how to create a partitioned
8737 image, see the
Andrew Geissler09209ee2020-12-13 08:44:15 -06008738 ":ref:`dev-manual/common-tasks:creating partitioned images using wic`"
Andrew Geisslerf0343792020-11-18 10:42:21 -06008739 section in the Yocto Project Development Tasks Manual. For details on
Andrew Geissler09209ee2020-12-13 08:44:15 -06008740 the kickstart file format, see the ":doc:`/ref-manual/kickstart`" Chapter.
Andrew Geisslerf0343792020-11-18 10:42:21 -06008741
8742 :term:`WKS_FILE_DEPENDS`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008743 When placed in the recipe that builds your image, this variable lists
8744 build-time dependencies. The ``WKS_FILE_DEPENDS`` variable is only
8745 applicable when Wic images are active (i.e. when
8746 :term:`IMAGE_FSTYPES` contains entries related
8747 to Wic). If your recipe does not create Wic images, the variable has
8748 no effect.
8749
8750 The ``WKS_FILE_DEPENDS`` variable is similar to the
8751 :term:`DEPENDS` variable. When you use the variable in
8752 your recipe that builds the Wic image, dependencies you list in the
8753 ``WIC_FILE_DEPENDS`` variable are added to the ``DEPENDS`` variable.
8754
8755 With the ``WKS_FILE_DEPENDS`` variable, you have the possibility to
8756 specify a list of additional dependencies (e.g. native tools,
8757 bootloaders, and so forth), that are required to build Wic images.
8758 Following is an example:
8759 ::
8760
8761 WKS_FILE_DEPENDS = "some-native-tool"
8762
8763 In the
8764 previous example, some-native-tool would be replaced with an actual
8765 native tool on which the build would depend.
8766
Andrew Geisslerf0343792020-11-18 10:42:21 -06008767 :term:`WORKDIR`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008768 The pathname of the work directory in which the OpenEmbedded build
8769 system builds a recipe. This directory is located within the
8770 :term:`TMPDIR` directory structure and is specific to
8771 the recipe being built and the system for which it is being built.
8772
8773 The ``WORKDIR`` directory is defined as follows:
8774 ::
8775
8776 ${TMPDIR}/work/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}
8777
8778 The actual directory depends on several things:
8779
Andrew Geissler4c19ea12020-10-27 13:52:24 -05008780 - :term:`TMPDIR`: The top-level build output directory
8781 - :term:`MULTIMACH_TARGET_SYS`: The target system identifier
8782 - :term:`PN`: The recipe name
8783 - :term:`EXTENDPE`: The epoch - (if :term:`PE` is not specified, which
8784 is usually the case for most recipes, then `EXTENDPE` is blank)
8785 - :term:`PV`: The recipe version
8786 - :term:`PR`: The recipe revision
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008787
8788 As an example, assume a Source Directory top-level folder name
8789 ``poky``, a default Build Directory at ``poky/build``, and a
8790 ``qemux86-poky-linux`` machine target system. Furthermore, suppose
8791 your recipe is named ``foo_1.3.0-r0.bb``. In this case, the work
8792 directory the build system uses to build the package would be as
8793 follows:
8794 ::
8795
8796 poky/build/tmp/work/qemux86-poky-linux/foo/1.3.0-r0
8797
Andrew Geisslerf0343792020-11-18 10:42:21 -06008798 :term:`XSERVER`
Andrew Geisslerc9f78652020-09-18 14:11:35 -05008799 Specifies the packages that should be installed to provide an X
8800 server and drivers for the current machine, assuming your image
8801 directly includes ``packagegroup-core-x11-xserver`` or, perhaps
8802 indirectly, includes "x11-base" in
8803 :term:`IMAGE_FEATURES`.
8804
8805 The default value of ``XSERVER``, if not specified in the machine
8806 configuration, is "xserver-xorg xf86-video-fbdev xf86-input-evdev".
8807