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Andrew Geissler09036742021-06-25 14:25:14 -05001Release 3.1 (dunfell)
2=====================
Andrew Geisslerc9f78652020-09-18 14:11:35 -05003
4This section provides migration information for moving to the Yocto
Andrew Geissler3b8a17c2021-04-15 15:55:55 -05005Project 3.1 Release (codename "dunfell") from the prior release.
Andrew Geisslerc9f78652020-09-18 14:11:35 -05006
7.. _migration-3.1-minimum-system-requirements:
8
9Minimum system requirements
10---------------------------
11
12The following versions / requirements of build host components have been
13updated:
14
15- gcc 5.0
16
17- python 3.5
18
19- tar 1.28
20
21- ``rpcgen`` is now required on the host (part of the ``libc-dev-bin``
22 package on Ubuntu, Debian and related distributions, and the
23 ``glibc`` package on RPM-based distributions).
24
25Additionally, the ``makeinfo`` and ``pod2man`` tools are *no longer*
26required on the host.
27
28.. _migration-3.1-mpc8315e-rdb-removed:
29
30mpc8315e-rdb machine removed
31----------------------------
32
33The MPC8315E-RDB machine is old/obsolete and unobtainable, thus given
34the maintenance burden the ``mpc8315e-rdb`` machine configuration that
35supported it has been removed in this release. The removal does leave a
36gap in official PowerPC reference hardware support; this may change in
37future if a suitable machine with accompanying support resources is
38found.
39
40.. _migration-3.1-python-2-removed:
41
42Python 2 removed
43----------------
44
45Due to the expiration of upstream support in January 2020, support for
46Python 2 has now been removed; it is recommended that you use Python 3
47instead. If absolutely needed there is a meta-python2 community layer
48containing Python 2, related classes and various Python 2-based modules,
49however it should not be considered as supported.
50
51.. _migration-3.1-reproducible-builds:
52
53Reproducible builds now enabled by default
54------------------------------------------
55
56In order to avoid unnecessary differences in output files (aiding binary
57reproducibility), the Poky distribution configuration
58(``DISTRO = "poky"``) now inherits the ``reproducible_build`` class by
59default.
60
61.. _migration-3.1-ptest-feature-impact:
62
63Impact of ptest feature is now more significant
64-----------------------------------------------
65
66The Poky distribution configuration (``DISTRO = "poky"``) enables ptests
67by default to enable runtime testing of various components. In this
68release, a dependency needed to be added that has resulted in a
69significant increase in the number of components that will be built just
70when building a simple image such as core-image-minimal. If you do not
71need runtime tests enabled for core components, then it is recommended
72that you remove "ptest" from
73:term:`DISTRO_FEATURES` to save a significant
Andrew Geisslerc926e172021-05-07 16:11:35 -050074amount of build time e.g. by adding the following in your configuration::
Andrew Geisslerc9f78652020-09-18 14:11:35 -050075
76 DISTRO_FEATURES_remove = "ptest"
77
78.. _migration-3.1-removed-recipes:
79
80Removed recipes
81---------------
82
83The following recipes have been removed:
84
85- ``chkconfig``: obsolete
86
87- ``console-tools``: obsolete
88
89- ``enchant``: replaced by ``enchant2``
90
91- ``foomatic-filters``: obsolete
92
93- ``libidn``: no longer needed, moved to meta-oe
94
95- ``libmodulemd``: replaced by ``libmodulemd-v1``
96
97- ``linux-yocto``: drop 4.19, 5.2 version recipes (5.4 now provided)
98
99- ``nspr``: no longer needed, moved to meta-oe
100
101- ``nss``: no longer needed, moved to meta-oe
102
103- ``python``: Python 2 removed (Python 3 preferred)
104
105- ``python-setuptools``: Python 2 version removed (python3-setuptools
106 preferred)
107
108- ``sysprof``: no longer needed, moved to meta-oe
109
110- ``texi2html``: obsolete
111
112- ``u-boot-fw-utils``: functionally replaced by ``libubootenv``
113
114.. _migration-3.1-features-check:
115
116features_check class replaces distro_features_check
117---------------------------------------------------
118
119The ``distro_features_check`` class has had its functionality expanded,
120now supporting ``ANY_OF_MACHINE_FEATURES``,
121``REQUIRED_MACHINE_FEATURES``, ``CONFLICT_MACHINE_FEATURES``,
122``ANY_OF_COMBINED_FEATURES``, ``REQUIRED_COMBINED_FEATURES``,
123``CONFLICT_COMBINED_FEATURES``. As a result the class has now been
124renamed to ``features_check``; the ``distro_features_check`` class still
125exists but generates a warning and redirects to the new class. In
126preparation for a future removal of the old class it is recommended that
127you update recipes currently inheriting ``distro_features_check`` to
128inherit ``features_check`` instead.
129
130.. _migration-3.1-removed-classes:
131
132Removed classes
133---------------
134
135The following classes have been removed:
136
137- ``distutils-base``: moved to meta-python2
138
139- ``distutils``: moved to meta-python2
140
141- ``libc-common``: merged into the glibc recipe as nothing else used
142 it.
143
144- ``python-dir``: moved to meta-python2
145
146- ``pythonnative``: moved to meta-python2
147
148- ``setuptools``: moved to meta-python2
149
150- ``tinderclient``: dropped as it was obsolete.
151
152.. _migration-3.1-src-uri-checksums:
153
154SRC_URI checksum behaviour
155--------------------------
156
157Previously, recipes by tradition included both SHA256 and MD5 checksums
158for remotely fetched files in :term:`SRC_URI`, even
159though only one is actually mandated. However, the MD5 checksum does not
160add much given its inherent weakness; thus when a checksum fails only
161the SHA256 sum will now be printed. The md5sum will still be verified if
162it is specified.
163
164.. _migration-3.1-npm:
165
166npm fetcher changes
167-------------------
168
169The npm fetcher has been completely reworked in this release. The npm
170fetcher now only fetches the package source itself and no longer the
171dependencies; there is now also an npmsw fetcher which explicitly
172fetches the shrinkwrap file and the dependencies. This removes the
173slightly awkward ``NPM_LOCKDOWN`` and ``NPM_SHRINKWRAP`` variables which
174pointed to local files; the lockdown file is no longer needed at all.
175Additionally, the package name in ``npm://`` entries in
176:term:`SRC_URI` is now specified using a ``package``
177parameter instead of the earlier ``name`` which overlapped with the
178generic ``name`` parameter. All recipes using the npm fetcher will need
179to be changed as a result.
180
Andrew Geisslerc926e172021-05-07 16:11:35 -0500181An example of the new scheme::
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500182
Andrew Geissler4c19ea12020-10-27 13:52:24 -0500183 SRC_URI = "npm://registry.npmjs.org;package=array-flatten;version=1.1.1 \
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500184 npmsw://${THISDIR}/npm-shrinkwrap.json"
185
Andrew Geisslerc926e172021-05-07 16:11:35 -0500186Another example where the sources are fetched from git rather than an npm repository::
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500187
188 SRC_URI = "git://github.com/foo/bar.git;protocol=https \
189 npmsw://${THISDIR}/npm-shrinkwrap.json"
190
191devtool and recipetool have also been updated to match with the npm
192fetcher changes. Other than producing working and more complete recipes
193for npm sources, there is also a minor change to the command line for
194devtool: the ``--fetch-dev`` option has been renamed to ``--npm-dev`` as
195it is npm-specific.
196
197.. _migration-3.1-packaging-changes:
198
199Packaging changes
200-----------------
201
202- ``intltool`` has been removed from ``packagegroup-core-sdk`` as it is
203 rarely needed to build modern software - gettext can do most of the
204 things it used to be needed for. ``intltool`` has also been removed
205 from ``packagegroup-core-self-hosted`` as it is not needed to for
206 standard builds.
207
208- git: ``git-am``, ``git-difftool``, ``git-submodule``, and
209 ``git-request-pull`` are no longer perl-based, so are now installed
210 with the main ``git`` package instead of within ``git-perltools``.
211
212- The ``ldconfig`` binary built as part of glibc has now been moved to
213 its own ``ldconfig`` package (note no ``glibc-`` prefix). This
214 package is in the :term:`RRECOMMENDS` of the main
215 ``glibc`` package if ``ldconfig`` is present in
216 :term:`DISTRO_FEATURES`.
217
218- ``libevent`` now splits each shared library into its own package (as
219 Debian does). Since these are shared libraries and will be pulled in
220 through the normal shared library dependency handling, there should
221 be no impact to existing configurations other than less unnecessary
222 libraries being installed in some cases.
223
224- linux-firmware now has a new package for ``bcm4366c`` and includes
225 available NVRAM config files into the ``bcm43340``, ``bcm43362``,
226 ``bcm43430`` and ``bcm4356-pcie`` packages.
227
228- ``harfbuzz`` now splits the new ``libharfbuzz-subset.so`` library
229 into its own package to reduce the main package size in cases where
230 ``libharfbuzz-subset.so`` is not needed.
231
232.. _migration-3.1-package-qa-warnings:
233
234Additional warnings
235-------------------
236
237Warnings will now be shown at ``do_package_qa`` time in the following
238circumstances:
239
240- A recipe installs ``.desktop`` files containing ``MimeType`` keys but
241 does not inherit the new ``mime-xdg`` class
242
243- A recipe installs ``.xml`` files into ``${datadir}/mime/packages``
244 but does not inherit the ``mime`` class
245
246.. _migration-3.1-x86-live-wic:
247
248``wic`` image type now used instead of ``live`` by default for x86
249------------------------------------------------------------------
250
251``conf/machine/include/x86-base.inc`` (inherited by most x86 machine
252configurations) now specifies ``wic`` instead of ``live`` by default in
253:term:`IMAGE_FSTYPES`. The ``live`` image type will
254likely be removed in a future release so it is recommended that you use
255``wic`` instead.
256
257.. _migration-3.1-misc:
258
259Miscellaneous changes
260---------------------
261
262- The undocumented ``SRC_DISTRIBUTE_LICENSES`` variable has now been
Andrew Geissler09036742021-06-25 14:25:14 -0500263 removed in favour of a new :term:`AVAILABLE_LICENSES` variable which is
Andrew Geisslerc9f78652020-09-18 14:11:35 -0500264 dynamically set based upon license files found in
265 ``${COMMON_LICENSE_DIR}`` and ``${LICENSE_PATH}``.
266
267- The tune definition for big-endian microblaze machines is now
268 ``microblaze`` instead of ``microblazeeb``.
269
270- ``newlib`` no longer has built-in syscalls. ``libgloss`` should then
271 provide the syscalls, ``crt0.o`` and other functions that are no
272 longer part of ``newlib`` itself. If you are using
273 ``TCLIBC = "newlib"`` this now means that you must link applications
274 with both ``newlib`` and ``libgloss``, whereas before ``newlib``
275 would run in many configurations by itself.