ref-manual: move migration guides to separate document

This makes the reference manual much lighter by moving
the migration guides to a separate document.

The migration guides are also reordered from last to first,
and they appear directly in the left bar, making them easier
to find in the documentation.

(From yocto-docs rev: 5121b86ee97eb62a0c69c9ad1fc0e3fabbe3e934)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 180 insertions, 0 deletions

diff --git a/documentation/migration-guides/migration-2.7.rst b/documentation/migration-guides/migration-2.7.rst
new file mode 100644
index 0000000000..66cb84584f
--- /dev/null
+++ b/documentation/migration-guides/migration-2.7.rst
@@ -0,0 +1,180 @@
+Release 2.7 (warrior)
+=====================
+
+This section provides migration information for moving to the Yocto
+Project 2.7 Release (codename "warrior") from the prior release.
+
+.. _migration-2.7-bitbake-changes:
+
+BitBake Changes
+---------------
+
+The following changes have been made to BitBake:
+
+-  BitBake now checks anonymous Python functions and pure Python
+   functions (e.g. ``def funcname:``) in the metadata for tab
+   indentation. If found, BitBake produces a warning.
+
+-  Bitbake now checks
+   :term:`BBFILE_COLLECTIONS` for duplicate
+   entries and triggers an error if any are found.
+
+.. _migration-2.7-eclipse-support-dropped:
+
+Eclipse Support Removed
+-----------------------
+
+Support for the Eclipse IDE has been removed. Support continues for
+those releases prior to 2.7 that did include support. The 2.7 release
+does not include the Eclipse Yocto plugin.
+
+.. _migration-2.7-qemu-native-splits-system-and-user-mode-parts:
+
+``qemu-native`` Splits the System and User-Mode Parts
+-----------------------------------------------------
+
+The system and user-mode parts of ``qemu-native`` are now split.
+``qemu-native`` provides the user-mode components and
+``qemu-system-native`` provides the system components. If you have
+recipes that depend on QEMU's system emulation functionality at build
+time, they should now depend upon ``qemu-system-native`` instead of
+``qemu-native``.
+
+.. _migration-2.7-upstream-tracking.inc-removed:
+
+The ``upstream-tracking.inc`` File Has Been Removed
+---------------------------------------------------
+
+The previously deprecated ``upstream-tracking.inc`` file is now removed.
+Any ``UPSTREAM_TRACKING*`` variables are now set in the corresponding
+recipes instead.
+
+Remove any references you have to the ``upstream-tracking.inc`` file in
+your configuration.
+
+.. _migration-2.7-distro-features-libc-removed:
+
+The ``DISTRO_FEATURES_LIBC`` Variable Has Been Removed
+------------------------------------------------------
+
+The ``DISTRO_FEATURES_LIBC`` variable is no longer used. The ability to
+configure glibc using kconfig has been removed for quite some time
+making the ``libc-*`` features set no longer effective.
+
+Remove any references you have to ``DISTRO_FEATURES_LIBC`` in your own
+layers.
+
+.. _migration-2.7-license-values:
+
+License Value Corrections
+-------------------------
+
+The following corrections have been made to the
+:term:`LICENSE` values set by recipes:
+
+- *socat*: Corrected ``LICENSE`` to be "GPLv2" rather than "GPLv2+".
+- *libgfortran*: Set license to "GPL-3.0-with-GCC-exception".
+- *elfutils*: Removed "Elfutils-Exception" and set to "GPLv2" for shared libraries
+
+.. _migration-2.7-packaging-changes:
+
+Packaging Changes
+-----------------
+
+This section provides information about packaging changes.
+
+-  ``bind``: The ``nsupdate`` binary has been moved to the
+   ``bind-utils`` package.
+
+-  Debug split: The default debug split has been changed to create
+   separate source packages (i.e. package_name\ ``-dbg`` and
+   package_name\ ``-src``). If you are currently using ``dbg-pkgs`` in
+   :term:`IMAGE_FEATURES` to bring in debug
+   symbols and you still need the sources, you must now also add
+   ``src-pkgs`` to ``IMAGE_FEATURES``. Source packages remain in the
+   target portion of the SDK by default, unless you have set your own
+   value for :term:`SDKIMAGE_FEATURES` that
+   does not include ``src-pkgs``.
+
+-  Mount all using ``util-linux``: ``/etc/default/mountall`` has moved
+   into the -mount sub-package.
+
+-  Splitting binaries using ``util-linux``: ``util-linux`` now splits
+   each binary into its own package for fine-grained control. The main
+   ``util-linux`` package pulls in the individual binary packages using
+   the :term:`RRECOMMENDS` and
+   :term:`RDEPENDS` variables. As a result, existing
+   images should not see any changes assuming
+   :term:`NO_RECOMMENDATIONS` is not set.
+
+-  ``netbase/base-files``: ``/etc/hosts`` has moved from ``netbase`` to
+   ``base-files``.
+
+-  ``tzdata``: The main package has been converted to an empty meta
+   package that pulls in all ``tzdata`` packages by default.
+
+-  ``lrzsz``: This package has been removed from
+   ``packagegroup-self-hosted`` and
+   ``packagegroup-core-tools-testapps``. The X/Y/ZModem support is less
+   likely to be needed on modern systems. If you are relying on these
+   packagegroups to include the ``lrzsz`` package in your image, you now
+   need to explicitly add the package.
+
+.. _migration-2.7-removed-recipes:
+
+Removed Recipes
+---------------
+
+The following recipes have been removed:
+
+- *gcc*: Drop version 7.3 recipes. Version 8.3 now remains.
+- *linux-yocto*: Drop versions 4.14 and 4.18 recipes. Versions 4.19 and 5.0 remain.
+- *go*: Drop version 1.9 recipes. Versions 1.11 and 1.12 remain.
+- *xvideo-tests*: Became obsolete.
+- *libart-lgpl*: Became obsolete.
+- *gtk-icon-utils-native*: These tools are now provided by gtk+3-native
+- *gcc-cross-initial*: No longer needed. gcc-cross/gcc-crosssdk is now used instead.
+- *gcc-crosssdk-initial*: No longer needed. gcc-cross/gcc-crosssdk is now used instead.
+- *glibc-initial*: Removed because the benefits of having it for site_config are currently outweighed by the cost of building the recipe.
+
+.. _migration-2.7-removed-classes:
+
+Removed Classes
+---------------
+
+The following classes have been removed:
+
+- *distutils-tools*: This class was never used.
+- *bugzilla.bbclass*: Became obsolete.
+- *distrodata*: This functionally has been replaced by a more modern tinfoil-based implementation.
+
+.. _migration-2.7-miscellaneous-changes:
+
+Miscellaneous Changes
+---------------------
+
+The following miscellaneous changes occurred:
+
+-  The ``distro`` subdirectory of the Poky repository has been removed
+   from the top-level ``scripts`` directory.
+
+-  Perl now builds for the target using
+   `perl-cross <https://arsv.github.io/perl-cross/>`_ for better
+   maintainability and improved build performance. This change should
+   not present any problems unless you have heavily customized your Perl
+   recipe.
+
+-  ``arm-tunes``: Removed the "-march" option if mcpu is already added.
+
+-  ``update-alternatives``: Convert file renames to
+   :term:`PACKAGE_PREPROCESS_FUNCS`
+
+-  ``base/pixbufcache``: Obsolete ``sstatecompletions`` code has been
+   removed.
+
+-  :ref:`native <ref-classes-native>` class:
+   :term:`RDEPENDS` handling has been enabled.
+
+-  ``inetutils``: This recipe has rsh disabled.
+
+