@@ -18,11 +18,78 @@ BitBake and OpenEmbedded-Core are now relying on Python 3.8,
making it a requirement to use a distribution providing at least this
version, or to use :term:`buildtools`.
+.. _migration-4.2-gcc-8.0:
+
+gcc 8.0 is now the minumum required GNU C compiler version
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This version, released in 2018, is a minimum requirement
+to build the ``mesa-native`` recipe.
+
+.. _migration-4.2-new-nvd-api:
+
+Fetching the NVD vulnerability database through the 2.0 API
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This new version adds a new fetcher for the NVD database using the 2.0 API,
+as the 1.0 API will be retired in 2023.
+
+The implementation changes as little as possible, keeping the current
+database format (but using a different database file for the transition
+period), with a notable exception of not using the META table.
+
+Here are minor changes that you may notice:
+
+- The database starts in 1999 instead of 2002
+- The complete fetch is longer (30 minutes typically)
+
+.. _migration-4.2-rust-crate-checksums:
+
+Rust: mandatory checksums for crates
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This release now supports checksums for Rust crates and make
+them mandatory for each crate in a recipe. See :yocto_git:`python3_bcrypt recipe changes
+</poky/commit/?h=mickledore&id=0dcb5ab3462fdaaf1646b05a00c7150eea711a9a>`
+for example.
+
+The ``cargo-update-recipe-crates`` utility
+:yocto_git:`has been extended </poky/commit/?h=mickledore&id=eef7fbea2c5bf59369390be4d5efa915591b7b22>`
+to include such checksums. So, in case you need to add the list of checksums
+to a recipe just inheriting the :ref:`ref-classes-cargo` class so far, you can
+follow these steps:
+
+#. Make the recipe inherit :ref:`ref-classes-cargo-update-recipe-crates`
+#. Remove all ``crate://`` lines from the recipe
+#. Create an empty ``${BPN}-crates.inc`` file and make your recipe require it
+#. Execute ``bitbake -c update_crates your_recipe``
+#. Copy and paste the output of BitBake about the missing checksums into the
+ ``${BPN}-crates.inc`` file.
+
.. _migration-4.2-qa-checks:
QA check changes
~~~~~~~~~~~~~~~~
+.. _migration-4.2-supported-distributions:
+
+Supported distributions
+~~~~~~~~~~~~~~~~~~~~~~~
+
+This release supports running BitBake on new GNU/Linux distributions:
+
+- Fedora 36 and 37
+- AlmaLinux 8.7 and 9.1
+- OpenSuse 15.4
+
+On the other hand, some earlier distributions are no longer supported:
+
+- Debian 10.x
+- Fedora 34 and 35
+- AlmaLinux 8.5
+
+See :ref:`all supported distributions <system-requirements-supported-distros>`.
+
.. _migration-4.2-misc-changes:
Miscellaneous changes
@@ -30,6 +97,7 @@ Miscellaneous changes
- The ``OEBasic`` signature handler (see :term:`BB_SIGNATURE_HANDLER`) has been
removed.
+
.. _migration-4.2-removed-variables:
@@ -38,7 +106,7 @@ Removed variables
The following variables have been removed:
-- ``SERIAL_CONSOLE``, deprecated since version 2.6, replaced by :term:``SERIAL_CONSOLES``.
+- ``SERIAL_CONSOLE``, deprecated since version 2.6, replaced by :term:`SERIAL_CONSOLES`.
.. _migration-4.2-removed-recipes:
@@ -47,3 +115,17 @@ Removed recipes
The following recipes have been removed in this release:
+- ``python3-picobuild``: after switching to ``python3-build``
+- ``python3-strict-rfc3339``: unmaintained and not needed by anything in
+ :oe_git:`openembedded-core </openembedded-core>`
+ or :oe_git:`meta-openembedded </meta-openembedded>`.
+
+.. _migration-4.2-removed-classes:
+
+Removed classes
+~~~~~~~~~~~~~~~
+
+The following classes have been removed in this release:
+
+- ``rust-bin``: no longer used in Poky
+
@@ -6,23 +6,75 @@ Release notes for 4.2 (mickledore)
New Features / Enhancements in 4.2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- Python 3.8 is the minimum Python version required on the build host.
- For host distributions that do not provide it, this is included as part of the
- :term:`buildtools` tarball.
+- Python 3.8 is the minimum Python version required on the build host.
+ For host distributions that do not provide it, this is included as part of the
+ :term:`buildtools` tarball.
-- This release now supports a new ``addpylib`` directive to enable
- Python libraries within layers.
+- BitBake in this release now supports a new ``addpylib`` directive to enable
+ Python libraries within layers.
- This directive should be added to your layer configuration,
- as in the below example from ``meta/conf/layer.conf``::
+ This directive should be added to your layer configuration
+ as in the below example from ``meta/conf/layer.conf``::
- addpylib ${LAYERDIR}/lib oe
+ addpylib ${LAYERDIR}/lib oe
+
+- BitBake has seen multiple internal changes that may impact
+ memory and disk usage as well as parsing time, in particular:
+
+ - BitBake's Cooker server is now multithreaded.
+
+ - BitBake's cache has been extended to include more hash
+ debugging data, but has also been optimized to :yocto_git:`compress
+ cache data <https://git.yoctoproject.org/poky/commit/?h=mickledore&id=7d010055e2af3294e17db862f42664ca689a9356>`.
+
+ - BitBake's Cooker server :yocto_git:`can now be pinged
+ https://git.yoctoproject.org/poky/commit/?h=mickledore&id=26f255da09>`
+ from the UI.
- Architecture-specific enhancements:
+ - This release adds initial support for the
+ :wikipedia:`LoongArch <Loongson#LoongArch>`
+ (``loongarch64``) architecture, though there is no testing for it yet.
+
- Kernel-related enhancements:
- QEMU/runqemu enhancements:
- Image-related enhancements:
+- New variables:
+
+ - :term:`VOLATILE_TMP_DIR` allows to specify
+ whether ``/tmp`` should be on persistent storage
+ or in RAM.
+
+- Rust improvements:
+
+ - This release adds Cargo support on the target, and includes
+ automated QA tests for this functionality.
+
+ - It also supports checksums for Rust crates and makes
+ them mandatory for each crate in a recipe.
+
+- Testing:
+
+ - The ``test-results`` script has been substantially improved
+ to better process and help to interpret test results.
+ See `this example <https://autobuilder.yocto.io/pub/non-release/20230405-6/testresults/buildperf-alma8/perf-alma8_master_20230405030047_38e3769a72.html>`__.
+
+ - It is now possible to track regression changes between releases using
+ ``resulttool``. Here is an example command, which allowed to spot and fix
+ a regression in the ``quilt`` ptest::
+
+ yocto_testresults_query.py regression-report 4.2_M1 4.2_M2
+
+ - This release adds support for parallel ptest execution with a ptest per image.
+ This takes ptest execution time from 3.5 hours to around 45 minutes on the autobuilder.
+
+- Miscellaneous changes:
+
+ - Supporting 64 bit dates on 32 bit platforms: several packages have been
+ updated to pass Y2038 tests.
+
+ - Many packages were updated to add large file support.