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authorScott Rifenbark <srifenbark@gmail.com>2016-07-12 14:08:32 -0700
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-07-21 07:47:35 +0100
commit185c9c5fc205fe9c9daf5238f11b92bd0954f5c6 (patch)
treec72028f0f86f0f0759c4d29f1d62a5884b8dd316
parentc2e72928fbd21d622860a54a55f4239ba27c07a2 (diff)
downloadbitbake-185c9c5fc205fe9c9daf5238f11b92bd0954f5c6.tar.gz
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@gmail.com>
-rw-r--r--doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml21
1 files changed, 21 insertions, 0 deletions
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 4d06ff950..e26422a42 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>