From: André Draszik <g...@andred.net>
See e.g.
http://permalink.gmane.org/gmane.comp.handhelds.openembedded/64067
Signed-off-by: André Draszik <g...@andred.net>
---
documentation/ref-manual/ref-classes.xml | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/documentation/ref-manual/ref-classes.xml
b/documentation/ref-manual/ref-classes.xml
index d482ca0..a9b2f3c 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -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>
--
2.1.4
--
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