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| -rw-r--r-- | doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml | 21 |
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> |