[oe-commits] [bitbake] 05/13: bitbake-user-manual: Added clarifying note to BBCLASSEXTEND variable.
git at git.openembedded.org
git at git.openembedded.org
Thu Jul 21 06:49:49 UTC 2016
rpurdie pushed a commit to branch master
in repository bitbake.
commit 185c9c5fc205fe9c9daf5238f11b92bd0954f5c6
Author: Scott Rifenbark <srifenbark at gmail.com>
AuthorDate: Tue Jul 12 14:08:32 2016 -0700
bitbake-user-manual: Added clarifying note to BBCLASSEXTEND variable.
Fixes [YOCTO #9909]
Added a note that talks about how the BBCLASSEXTEND mechanism
adds recipe variants.
Signed-off-by: Scott Rifenbark <srifenbark at gmail.com>
---
.../bitbake-user-manual-ref-variables.xml | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml b/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml
index 4d06ff9..e26422a 100644
--- a/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml
+++ b/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml
@@ -986,6 +986,27 @@
BBCLASSEXTEND =+ "native nativesdk"
BBCLASSEXTEND =+ "multilib:<replaceable>multilib_name</replaceable>"
</literallayout>
+ <note>
+ <para>
+ Internally, the <filename>BBCLASSEXTEND</filename>
+ mechanism generates recipe variants by rewriting
+ variable values and applying overrides such as
+ <filename>_class-native</filename>.
+ For example, to generate a native version of a recipe
+ named "foo", a
+ <link linkend='var-DEPENDS'><filename>DEPENDS</filename></link>
+ on "foo" is rewritten to a <filename>DEPENDS</filename>
+ on "foo-native".
+ </para>
+
+ <para>
+ No reparsing, which adds some limitations, of the
+ recipe is done for each variant.
+ For example, it is not possible to "include" a
+ different file depending on the variant, since
+ "include's" are processed when the recipe is parsed.
+ </para>
+ </note>
</para>
</glossdef>
</glossentry>
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