poky/documentation/ref-manual/migration-1.7.rst - mdmillerii/openbmc - Gitiles

 Moving to the Yocto Project 1.7 Release
 =======================================

 This section provides migration information for moving to the Yocto
 Project 1.7 Release from the prior release.

 .. _migration-1.7-changes-to-setting-qemu-packageconfig-options:

 Changes to Setting QEMU ``PACKAGECONFIG`` Options in ``local.conf``
 -------------------------------------------------------------------

 The QEMU recipe now uses a number of
 :term:`PACKAGECONFIG` options to enable various
 optional features. The method used to set defaults for these options
 means that existing ``local.conf`` files will need to be be modified to
 append to ``PACKAGECONFIG`` for ``qemu-native`` and ``nativesdk-qemu``
 instead of setting it. In other words, to enable graphical output for
 QEMU, you should now have these lines in ``local.conf``:
 ::

    PACKAGECONFIG_append_pn-qemu-native = " sdl"
    PACKAGECONFIG_append_pn-nativesdk-qemu = " sdl"

 .. _migration-1.7-minimum-git-version:

 Minimum Git version
 -------------------

 The minimum :ref:`overview-manual/overview-manual-development-environment:git`
 version required on the
 build host is now 1.7.8 because the ``--list`` option is now required by
 BitBake's Git fetcher. As always, if your host distribution does not
 provide a version of Git that meets this requirement, you can use the
 ``buildtools-tarball`` that does. See the
 ":ref:`ref-manual/ref-system-requirements:required git, tar, python and gcc versions`"
 section for more information.

 .. _migration-1.7-autotools-class-changes:

 Autotools Class Changes
 -----------------------

 The following :ref:`autotools <ref-classes-autotools>` class changes
 occurred:

 -  *A separate build directory is now used by default:* The
    ``autotools`` class has been changed to use a directory for building
    (:term:`B`), which is separate from the source directory
    (:term:`S`). This is commonly referred to as ``B != S``, or
    an out-of-tree build.

    If the software being built is already capable of building in a
    directory separate from the source, you do not need to do anything.
    However, if the software is not capable of being built in this
    manner, you will need to either patch the software so that it can
    build separately, or you will need to change the recipe to inherit
    the :ref:`autotools-brokensep <ref-classes-autotools>` class
    instead of the ``autotools`` or ``autotools_stage`` classes.

 -  The ``--foreign`` option is no longer passed to ``automake`` when
    running ``autoconf``: This option tells ``automake`` that a
    particular software package does not follow the GNU standards and
    therefore should not be expected to distribute certain files such as
    ``ChangeLog``, ``AUTHORS``, and so forth. Because the majority of
    upstream software packages already tell ``automake`` to enable
    foreign mode themselves, the option is mostly superfluous. However,
    some recipes will need patches for this change. You can easily make
    the change by patching ``configure.ac`` so that it passes "foreign"
    to ``AM_INIT_AUTOMAKE()``. See `this
    commit <http://cgit.openembedded.org/openembedded-core/commit/?id=01943188f85ce6411717fb5bf702d609f55813f2>`__
    for an example showing how to make the patch.

 .. _migration-1.7-binary-configuration-scripts-disabled:

 Binary Configuration Scripts Disabled
 -------------------------------------

 Some of the core recipes that package binary configuration scripts now
 disable the scripts due to the scripts previously requiring error-prone
 path substitution. Software that links against these libraries using
 these scripts should use the much more robust ``pkg-config`` instead.
 The list of recipes changed in this version (and their configuration
 scripts) is as follows:
 ::

    directfb (directfb-config)
    freetype (freetype-config)
    gpgme (gpgme-config)
    libassuan (libassuan-config)
    libcroco (croco-6.0-config)
    libgcrypt (libgcrypt-config)
    libgpg-error (gpg-error-config)
    libksba (ksba-config)
    libpcap (pcap-config)
    libpcre (pcre-config)
    libpng (libpng-config, libpng16-config)
    libsdl (sdl-config)
    libusb-compat (libusb-config)
    libxml2 (xml2-config)
    libxslt (xslt-config)
    ncurses (ncurses-config)
    neon (neon-config)
    npth (npth-config)
    pth (pth-config)
    taglib (taglib-config)

 Additionally, support for ``pkg-config`` has been added to some recipes in the
 previous list in the rare cases where the upstream software package does
 not already provide it.

 .. _migration-1.7-glibc-replaces-eglibc:

 ``eglibc 2.19`` Replaced with ``glibc 2.20``
 --------------------------------------------

 Because ``eglibc`` and ``glibc`` were already fairly close, this
 replacement should not require any significant changes to other software
 that links to ``eglibc``. However, there were a number of minor changes
 in ``glibc 2.20`` upstream that could require patching some software
 (e.g. the removal of the ``_BSD_SOURCE`` feature test macro).

 ``glibc 2.20`` requires version 2.6.32 or greater of the Linux kernel.
 Thus, older kernels will no longer be usable in conjunction with it.

 For full details on the changes in ``glibc 2.20``, see the upstream
 release notes
 `here <https://sourceware.org/ml/libc-alpha/2014-09/msg00088.html>`__.

 .. _migration-1.7-kernel-module-autoloading:

 Kernel Module Autoloading
 -------------------------

 The :term:`module_autoload_* <module_autoload>` variable is now
 deprecated and a new
 :term:`KERNEL_MODULE_AUTOLOAD` variable
 should be used instead. Also, :term:`module_conf_* <module_conf>`
 must now be used in conjunction with a new
 :term:`KERNEL_MODULE_PROBECONF` variable.
 The new variables no longer require you to specify the module name as
 part of the variable name. This change not only simplifies usage but
 also allows the values of these variables to be appropriately
 incorporated into task signatures and thus trigger the appropriate tasks
 to re-execute when changed. You should replace any references to
 ``module_autoload_*`` with ``KERNEL_MODULE_AUTOLOAD``, and add any
 modules for which ``module_conf_*`` is specified to
 ``KERNEL_MODULE_PROBECONF``.

 .. _migration-1.7-qa-check-changes:

 QA Check Changes
 ----------------

 The following changes have occurred to the QA check process:

 -  Additional QA checks ``file-rdeps`` and ``build-deps`` have been
    added in order to verify that file dependencies are satisfied (e.g.
    package contains a script requiring ``/bin/bash``) and build-time
    dependencies are declared, respectively. For more information, please
    see the ":doc:`ref-qa-checks`" chapter.

 -  Package QA checks are now performed during a new
    :ref:`ref-tasks-package_qa` task rather than being
    part of the :ref:`ref-tasks-package` task. This allows
    more parallel execution. This change is unlikely to be an issue
    except for highly customized recipes that disable packaging tasks
    themselves by marking them as ``noexec``. For those packages, you
    will need to disable the ``do_package_qa`` task as well.

 -  Files being overwritten during the
    :ref:`ref-tasks-populate_sysroot` task now
    trigger an error instead of a warning. Recipes should not be
    overwriting files written to the sysroot by other recipes. If you
    have these types of recipes, you need to alter them so that they do
    not overwrite these files.

    You might now receive this error after changes in configuration or
    metadata resulting in orphaned files being left in the sysroot. If
    you do receive this error, the way to resolve the issue is to delete
    your :term:`TMPDIR` or to move it out of the way and
    then re-start the build. Anything that has been fully built up to
    that point and does not need rebuilding will be restored from the
    shared state cache and the rest of the build will be able to proceed
    as normal.

 .. _migration-1.7-removed-recipes:

 Removed Recipes
 ---------------

 The following recipes have been removed:

 -  ``x-load``: This recipe has been superseded by U-boot SPL for all
    Cortex-based TI SoCs. For legacy boards, the ``meta-ti`` layer, which
    contains a maintained recipe, should be used instead.

 -  ``ubootchart``: This recipe is obsolete. A ``bootchart2`` recipe has
    been added to functionally replace it.

 -  ``linux-yocto 3.4``: Support for the linux-yocto 3.4 kernel has been
    dropped. Support for the 3.10 and 3.14 kernels remains, while support
    for version 3.17 has been added.

 -  ``eglibc`` has been removed in favor of ``glibc``. See the
    ":ref:`migration-1.7-glibc-replaces-eglibc`" section for more information.

 .. _migration-1.7-miscellaneous-changes:

 Miscellaneous Changes
 ---------------------

 The following miscellaneous change occurred:

 -  The build history feature now writes ``build-id.txt`` instead of
    ``build-id``. Additionally, ``build-id.txt`` now contains the full
    build header as printed by BitBake upon starting the build. You
    should manually remove old "build-id" files from your existing build
    history repositories to avoid confusion. For information on the build
    history feature, see the
    ":ref:`dev-manual/dev-manual-common-tasks:maintaining build output quality`"
    section in the Yocto Project Development Tasks Manual.
	Moving to the Yocto Project 1.7 Release
	=======================================

	This section provides migration information for moving to the Yocto
	Project 1.7 Release from the prior release.

	.. _migration-1.7-changes-to-setting-qemu-packageconfig-options:

	Changes to Setting QEMU ``PACKAGECONFIG`` Options in ``local.conf``
	-------------------------------------------------------------------

	The QEMU recipe now uses a number of
	:term:`PACKAGECONFIG` options to enable various
	optional features. The method used to set defaults for these options
	means that existing ``local.conf`` files will need to be be modified to
	append to ``PACKAGECONFIG`` for ``qemu-native`` and ``nativesdk-qemu``
	instead of setting it. In other words, to enable graphical output for
	QEMU, you should now have these lines in ``local.conf``:
	::

	PACKAGECONFIG_append_pn-qemu-native = " sdl"
	PACKAGECONFIG_append_pn-nativesdk-qemu = " sdl"

	.. _migration-1.7-minimum-git-version:

	Minimum Git version
	-------------------

	The minimum :ref:`overview-manual/overview-manual-development-environment:git`
	version required on the
	build host is now 1.7.8 because the ``--list`` option is now required by
	BitBake's Git fetcher. As always, if your host distribution does not
	provide a version of Git that meets this requirement, you can use the
	``buildtools-tarball`` that does. See the
	":ref:`ref-manual/ref-system-requirements:required git, tar, python and gcc versions`"
	section for more information.

	.. _migration-1.7-autotools-class-changes:

	Autotools Class Changes
	-----------------------

	The following :ref:`autotools <ref-classes-autotools>` class changes
	occurred:

	- A separate build directory is now used by default: The
	``autotools`` class has been changed to use a directory for building
	(:term:`B`), which is separate from the source directory
	(:term:`S`). This is commonly referred to as ``B != S``, or
	an out-of-tree build.

	If the software being built is already capable of building in a
	directory separate from the source, you do not need to do anything.
	However, if the software is not capable of being built in this
	manner, you will need to either patch the software so that it can
	build separately, or you will need to change the recipe to inherit
	the :ref:`autotools-brokensep <ref-classes-autotools>` class
	instead of the ``autotools`` or ``autotools_stage`` classes.

	- The ``--foreign`` option is no longer passed to ``automake`` when
	running ``autoconf``: This option tells ``automake`` that a
	particular software package does not follow the GNU standards and
	therefore should not be expected to distribute certain files such as
	``ChangeLog``, ``AUTHORS``, and so forth. Because the majority of
	upstream software packages already tell ``automake`` to enable
	foreign mode themselves, the option is mostly superfluous. However,
	some recipes will need patches for this change. You can easily make
	the change by patching ``configure.ac`` so that it passes "foreign"
	to ``AM_INIT_AUTOMAKE()``. See `this
	commit <http://cgit.openembedded.org/openembedded-core/commit/?id=01943188f85ce6411717fb5bf702d609f55813f2>`__
	for an example showing how to make the patch.

	.. _migration-1.7-binary-configuration-scripts-disabled:

	Binary Configuration Scripts Disabled
	-------------------------------------

	Some of the core recipes that package binary configuration scripts now
	disable the scripts due to the scripts previously requiring error-prone
	path substitution. Software that links against these libraries using
	these scripts should use the much more robust ``pkg-config`` instead.
	The list of recipes changed in this version (and their configuration
	scripts) is as follows:
	::

	directfb (directfb-config)
	freetype (freetype-config)
	gpgme (gpgme-config)
	libassuan (libassuan-config)
	libcroco (croco-6.0-config)
	libgcrypt (libgcrypt-config)
	libgpg-error (gpg-error-config)
	libksba (ksba-config)
	libpcap (pcap-config)
	libpcre (pcre-config)
	libpng (libpng-config, libpng16-config)
	libsdl (sdl-config)
	libusb-compat (libusb-config)
	libxml2 (xml2-config)
	libxslt (xslt-config)
	ncurses (ncurses-config)
	neon (neon-config)
	npth (npth-config)
	pth (pth-config)
	taglib (taglib-config)

	Additionally, support for ``pkg-config`` has been added to some recipes in the
	previous list in the rare cases where the upstream software package does
	not already provide it.

	.. _migration-1.7-glibc-replaces-eglibc:

	``eglibc 2.19`` Replaced with ``glibc 2.20``
	--------------------------------------------

	Because ``eglibc`` and ``glibc`` were already fairly close, this
	replacement should not require any significant changes to other software
	that links to ``eglibc``. However, there were a number of minor changes
	in ``glibc 2.20`` upstream that could require patching some software
	(e.g. the removal of the ``_BSD_SOURCE`` feature test macro).

	``glibc 2.20`` requires version 2.6.32 or greater of the Linux kernel.
	Thus, older kernels will no longer be usable in conjunction with it.

	For full details on the changes in ``glibc 2.20``, see the upstream
	release notes
	`here <https://sourceware.org/ml/libc-alpha/2014-09/msg00088.html>`__.

	.. _migration-1.7-kernel-module-autoloading:

	Kernel Module Autoloading
	-------------------------

	The :term:`module_autoload_* <module_autoload>` variable is now
	deprecated and a new
	:term:`KERNEL_MODULE_AUTOLOAD` variable
	should be used instead. Also, :term:`module_conf_* <module_conf>`
	must now be used in conjunction with a new
	:term:`KERNEL_MODULE_PROBECONF` variable.
	The new variables no longer require you to specify the module name as
	part of the variable name. This change not only simplifies usage but
	also allows the values of these variables to be appropriately
	incorporated into task signatures and thus trigger the appropriate tasks
	to re-execute when changed. You should replace any references to
	``module_autoload_*`` with ``KERNEL_MODULE_AUTOLOAD``, and add any
	modules for which ``module_conf_*`` is specified to
	``KERNEL_MODULE_PROBECONF``.

	.. _migration-1.7-qa-check-changes:

	QA Check Changes
	----------------

	The following changes have occurred to the QA check process:

	- Additional QA checks ``file-rdeps`` and ``build-deps`` have been
	added in order to verify that file dependencies are satisfied (e.g.
	package contains a script requiring ``/bin/bash``) and build-time
	dependencies are declared, respectively. For more information, please
	see the ":doc:`ref-qa-checks`" chapter.

	- Package QA checks are now performed during a new
	:ref:`ref-tasks-package_qa` task rather than being
	part of the :ref:`ref-tasks-package` task. This allows
	more parallel execution. This change is unlikely to be an issue
	except for highly customized recipes that disable packaging tasks
	themselves by marking them as ``noexec``. For those packages, you
	will need to disable the ``do_package_qa`` task as well.

	- Files being overwritten during the
	:ref:`ref-tasks-populate_sysroot` task now
	trigger an error instead of a warning. Recipes should not be
	overwriting files written to the sysroot by other recipes. If you
	have these types of recipes, you need to alter them so that they do
	not overwrite these files.

	You might now receive this error after changes in configuration or
	metadata resulting in orphaned files being left in the sysroot. If
	you do receive this error, the way to resolve the issue is to delete
	your :term:`TMPDIR` or to move it out of the way and
	then re-start the build. Anything that has been fully built up to
	that point and does not need rebuilding will be restored from the
	shared state cache and the rest of the build will be able to proceed
	as normal.

	.. _migration-1.7-removed-recipes:

	Removed Recipes
	---------------

	The following recipes have been removed:

	- ``x-load``: This recipe has been superseded by U-boot SPL for all
	Cortex-based TI SoCs. For legacy boards, the ``meta-ti`` layer, which
	contains a maintained recipe, should be used instead.

	- ``ubootchart``: This recipe is obsolete. A ``bootchart2`` recipe has
	been added to functionally replace it.

	- ``linux-yocto 3.4``: Support for the linux-yocto 3.4 kernel has been
	dropped. Support for the 3.10 and 3.14 kernels remains, while support
	for version 3.17 has been added.

	- ``eglibc`` has been removed in favor of ``glibc``. See the
	":ref:`migration-1.7-glibc-replaces-eglibc`" section for more information.

	.. _migration-1.7-miscellaneous-changes:

	Miscellaneous Changes
	---------------------

	The following miscellaneous change occurred:

	- The build history feature now writes ``build-id.txt`` instead of
	``build-id``. Additionally, ``build-id.txt`` now contains the full
	build header as printed by BitBake upon starting the build. You
	should manually remove old "build-id" files from your existing build
	history repositories to avoid confusion. For information on the build
	history feature, see the
	":ref:`dev-manual/dev-manual-common-tasks:maintaining build output quality`"
	section in the Yocto Project Development Tasks Manual.