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(From yocto-docs rev: ab14362b9d1fc70a55beaeed9373f1be474805b0) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
120 lines
3.6 KiB
ReStructuredText
120 lines
3.6 KiB
ReStructuredText
.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
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Release 4.3 (nanbield)
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========================
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Migration notes for 4.3 (nanbield)
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------------------------------------
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This section provides migration information for moving to the Yocto
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Project 4.3 Release (codename "nanbield") from the prior release.
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.. _migration-4.3-supported-kernel-versions:
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Supported kernel versions
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~~~~~~~~~~~~~~~~~~~~~~~~~
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The :term:`OLDEST_KERNEL` setting has been changed to "5.15" in this release, meaning that
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out the box, older kernels are not supported. There were two reasons for this.
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Firstly it allows glibc optimisations that improve the performance of the system
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by removing compatibility code and using modern kernel APIs exclusively. The second
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issue was this allows 64 bit time support even on 32 bit platforms and resolves Y2038
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issues.
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It is still possible to override this value and build for older kernels, this is just
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no longer the default supported configuration. This setting does not affect which
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kernel versions SDKs will run against and does not affect which versions of the kernel
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can be used to run builds.
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Layername override implications
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Code can now know which layer a recipe is coming from through the newly added
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:term:`FILE_LAYERNAME` variable and the ``layer-<layername> override``. This is being used
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for enabling QA checks on a per layer basis. For existing code this has the
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side effect that the QA checks will apply to things being bbappended to recipes
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from other layers. Those other layers would need to have patch upstream status
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entries for patches being bbappended for example.
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.. _migration-4.3-supported-distributions:
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Supported distributions
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~~~~~~~~~~~~~~~~~~~~~~~
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This release supports running BitBake on new GNU/Linux distributions:
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On the other hand, some earlier distributions are no longer supported:
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See :ref:`all supported distributions <system-requirements-supported-distros>`.
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.. _migration-4.3-go-changes:
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Go language changes
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~~~~~~~~~~~~~~~~~~~
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- Support for the Glide package manager has been removed, as ``go mod``
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has become the standard.
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Systemd changes
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~~~~~~~~~~~~~~~
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Upstream systemd is now more strict on filesystem layout and the ``usrmerge``
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feature is therefore required alongside systemd. The Poky test configurations
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have been updated accordingly for systemd.
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.. _migration-4.3-recipe-changes:
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Recipe changes
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~~~~~~~~~~~~~~
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- Runtime testing of ptest now fails if no test results are returned by
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any given ptest.
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.. _migration-4.3-class-changes:
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Class changes
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~~~~~~~~~~~~~
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- The ``perl-version`` class no longer provides the ``PERLVERSION`` and ``PERLARCH`` variables
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as there were no users in any core layer. The functions for this functionality
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are still available.
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.. _migration-4.3-removed-variables:
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Removed variables
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~~~~~~~~~~~~~~~~~
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The following variables have been removed:
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- ``PERLARCH``
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- ``PERLVERSION``
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.. _migration-4.3-removed-recipes:
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Removed recipes
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~~~~~~~~~~~~~~~
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The following recipes have been removed in this release:
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- ``glide``, as explained in :ref:`migration-4.3-go-changes`.
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.. _migration-4.3-removed-classes:
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Removed classes
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~~~~~~~~~~~~~~~
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The following classes have been removed in this release:
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.. _migration-4.3-misc-changes:
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Miscellaneous changes
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~~~~~~~~~~~~~~~~~~~~~
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- The ``-crosssdk`` suffix and any :term:`MLPREFIX` were removed from
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``virtual/XXX`` provider/dependencies where a ``PREFIX`` was used as well,
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as we don't need both and it made automated dependency rewriting
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unnecessarily complex. In general this only affects internal toolchain
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dependencies so isn't end user visible.
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