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ref-manual: add migration info about MLPREFIX changes

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Add a migration subsection on the need to add MLPREFIX to conditional
package dependencies in gatesgarth.

(From yocto-docs rev: e202beabfc1282d6999fde0ced89e41c993da27f)

Signed-off-by: Paul Eggleton <paul.eggleton@microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Paul Eggleton
2020-10-28 04:36:25 -07:00
committed by Richard Purdie
parent 4f91a3339c
commit 6de21a42a6
1 changed files with 31 additions and 0 deletions
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31
documentation/ref-manual/migration-3.2.rst
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@@ -75,6 +75,37 @@ pseudo will throw an ``abort()`` and direct you to a :yocto_wiki:`wiki page </wi
that explains how to deal with this.
.. _migration-3.2-multilib-mlprefix:
``MLPREFIX`` now required for multilib when runtime dependencies conditionally added
------------------------------------------------------------------------------------
In order to solve some previously intractable problems with runtime
dependencies and multilib, a change was made that now requires the :term:`MLPREFIX`
value to be explicitly prepended to package names being added as
dependencies (e.g. in :term:`RDEPENDS` and :term:`RRECOMMENDS` values)
where the dependency is conditionally added.
If you have anonymous python or in-line python conditionally adding
dependencies in your custom recipes, and you intend for those recipes to
work with multilib, then you will need to ensure that ``${MLPREFIX}``
is prefixed on the package names in the dependencies, for example
(from the ``glibc`` recipe): ::
RRECOMMENDS_${PN} = "${@bb.utils.contains('DISTRO_FEATURES', 'ldconfig', '${MLPREFIX}ldconfig', '', d)}"
This also applies when conditionally adding packages to :term:`PACKAGES` where
those packages have dependencies, for example (from the ``alsa-plugins`` recipe): ::
PACKAGES += "${@bb.utils.contains('PACKAGECONFIG', 'pulseaudio', 'alsa-plugins-pulseaudio-conf', '', d)}"
...
RDEPENDS_${PN}-pulseaudio-conf += "\
${MLPREFIX}libasound-module-conf-pulse \
${MLPREFIX}libasound-module-ctl-pulse \
${MLPREFIX}libasound-module-pcm-pulse \
"
.. _migration-3.2-packagegroup-core-device-devel:
packagegroup-core-device-devel no longer included in images built for qemu* machines