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ref-manual: Updated the allarch class description. 

Added a patch to include a note from Andre.

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Andre Draszik 2015-10-21 23:10:52 +01:00 committed by Richard Purdie
parent a8674ae642
commit 7d30d67b26
1 changed files with 14 additions and 12 deletions
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documentation/ref-manual/ref-classes.xml
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@ -52,20 +52,22 @@
and a C library as pre-requisites, and splitting out of debug symbols and a C library as pre-requisites, and splitting out of debug symbols
during packaging). during packaging).
<note> <note>
Unlike e.g. Debian, OpenEmbedded recipes that produce packages <para>Unlike some distro recipes (e.g. Debian), OpenEmbedded recipes
which that produce packages that depend on tunings through use of the
<link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link> <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link>
on and
<link linkend='var-TUNE_PKGARCH'><filename>TUNE_PKGARCH</filename></link> <link linkend='var-TUNE_PKGARCH'><filename>TUNE_PKGARCH</filename></link>
packages should never be made <filename>allarch</filename>, even variables, should never be configured for all architectures
if they do not produce architecture-specific output. This would using <filename>allarch</filename>.
cause the do_package_write_* tasks to have different signatures This is the case even if the recipes do not produce
for architecture-specific output.</para>
<link linkend='var-MACHINE'><filename>MACHINE</filename></link>s <para>Configuring such recipes for all architectures causes the
with different <link linkend='ref-tasks-package_write_deb'><filename>do_package_write_*</filename></link>
<link linkend='var-TUNE_PKGARCH'><filename>TUNE_PKGARCH</filename></link>, tasks to have different signatures for the machines with different
thus unnecessary rebuilds every single time an image for a different tunings.
MACHINE is built (even without any change to the recipe). Additionally, unnecessary rebuilds occur every time an
image for a different <filename>MACHINE</filename> is built
even when the recipe never changes.</para>
</note> </note>
</para> </para>