| Andrew Geissler | 3eeda90 | 2023-05-19 10:14:02 -0500 | [diff] [blame] | 1 | .. SPDX-License-Identifier: CC-BY-SA-2.0-UK |
| 2 | |
| 3 | Release 4.3 (nanbield) |
| 4 | ======================== |
| 5 | |
| 6 | Migration notes for 4.3 (nanbield) |
| 7 | ------------------------------------ |
| 8 | |
| 9 | This section provides migration information for moving to the Yocto |
| 10 | Project 4.3 Release (codename "nanbield") from the prior release. |
| 11 | |
| 12 | .. _migration-4.3-supported-kernel-versions: |
| 13 | |
| 14 | Supported kernel versions |
| 15 | ~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 16 | |
| 17 | The :term:`OLDEST_KERNEL` setting has been changed to "5.15" in this release, meaning that |
| 18 | out the box, older kernels are not supported. There were two reasons for this. |
| 19 | Firstly it allows glibc optimisations that improve the performance of the system |
| 20 | by removing compatibility code and using modern kernel APIs exclusively. The second |
| 21 | issue was this allows 64 bit time support even on 32 bit platforms and resolves Y2038 |
| 22 | issues. |
| 23 | |
| 24 | It is still possible to override this value and build for older kernels, this is just |
| 25 | no longer the default supported configuration. This setting does not affect which |
| 26 | kernel versions SDKs will run against and does not affect which versions of the kernel |
| 27 | can be used to run builds. |
| 28 | |
| 29 | .. _migration-4.3-supported-distributions: |
| 30 | |
| 31 | Supported distributions |
| 32 | ~~~~~~~~~~~~~~~~~~~~~~~ |
| 33 | |
| 34 | This release supports running BitBake on new GNU/Linux distributions: |
| 35 | |
| 36 | On the other hand, some earlier distributions are no longer supported: |
| 37 | |
| 38 | See :ref:`all supported distributions <system-requirements-supported-distros>`. |
| 39 | |
| 40 | .. _migration-4.3-go-changes: |
| 41 | |
| 42 | Go language changes |
| 43 | ~~~~~~~~~~~~~~~~~~~ |
| 44 | |
| 45 | - Support for the Glide package manager has been removed, as ``go mod`` |
| 46 | has become the standard. |
| 47 | |
| 48 | .. _migration-4.3-recipe-changes: |
| 49 | |
| 50 | Recipe changes |
| 51 | ~~~~~~~~~~~~~~ |
| 52 | |
| 53 | - Runtime testing of ptest now fails if no test results are returned by |
| 54 | any given ptest. |
| 55 | |
| 56 | .. _migration-4.3-class-changes: |
| 57 | |
| 58 | Class changes |
| 59 | ~~~~~~~~~~~~~ |
| 60 | |
| 61 | - The ``perl-version`` class no longer provides the ``PERLVERSION`` and ``PERLARCH`` variables |
| 62 | as there were no users in any core layer. The functions for this functionality |
| 63 | are still available. |
| 64 | |
| 65 | .. _migration-4.3-removed-variables: |
| 66 | |
| 67 | Removed variables |
| 68 | ~~~~~~~~~~~~~~~~~ |
| 69 | |
| 70 | The following variables have been removed: |
| 71 | |
| 72 | - ``PERLARCH`` |
| 73 | - ``PERLVERSION`` |
| 74 | |
| 75 | .. _migration-4.3-removed-recipes: |
| 76 | |
| 77 | Removed recipes |
| 78 | ~~~~~~~~~~~~~~~ |
| 79 | |
| 80 | The following recipes have been removed in this release: |
| 81 | |
| 82 | - ``glide``, as explained in :ref:`migration-4.3-go-changes`. |
| 83 | |
| 84 | .. _migration-4.3-removed-classes: |
| 85 | |
| 86 | Removed classes |
| 87 | ~~~~~~~~~~~~~~~ |
| 88 | |
| 89 | The following classes have been removed in this release: |
| 90 | |
| 91 | |
| 92 | .. _migration-4.3-misc-changes: |
| 93 | |
| 94 | Miscellaneous changes |
| 95 | ~~~~~~~~~~~~~~~~~~~~~ |
| 96 | |
| 97 | - The ``-crosssdk`` suffix and any :term:`MLPREFIX` were removed from |
| 98 | ``virtual/XXX`` provider/dependencies where a ``PREFIX`` was used as well, |
| 99 | as we don't need both and it made automated dependency rewriting |
| 100 | unnecessarily complex. In general this only affects internal toolchain |
| 101 | dependencies so isn't end user visible. |
| 102 | |