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ref-manual: clarify allarch wrt RDPENDS and TUNE_PKGARCH 

See e.g.
http://permalink.gmane.org/gmane.comp.handhelds.openembedded/64067

(From yocto-docs rev: 5ad5f90edc5aefc95049f36afa2792dd7a9fba3d)

Signed-off-by: André Draszik <git@andred.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
André Draszik 2015-07-28 09:07:39 +01:00 committed by Richard Purdie
parent a894da0dfe
commit 46f86497d5
1 changed files with 16 additions and 0 deletions
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documentation/ref-manual/ref-classes.xml
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@ -51,6 +51,22 @@
that produce executable binaries (such as building the cross-compiler
and a C library as pre-requisites, and splitting out of debug symbols
during packaging).
<note>
Unlike e.g. Debian, OpenEmbedded recipes that produce packages
which
<link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link>
on
<link linkend='var-TUNE_PKGARCH'><filename>TUNE_PKGARCH</filename></link>
packages should never be made <filename>allarch</filename>, even
if they do not produce architecture-specific output. This would
cause the do_package_write_* tasks to have different signatures
for
<link linkend='var-MACHINE'><filename>MACHINE</filename></link>s
with different
<link linkend='var-TUNE_PKGARCH'><filename>TUNE_PKGARCH</filename></link>,
thus unnecessary rebuilds every single time an image for a different
MACHINE is built (even without any change to the recipe).
</note>
</para>
<para>