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ref-manual: Added review changes to BBCLASSEXTEND description

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Fixes [YOCTO #9909]

Added some technical clarifications to the existing note to be clear
about what is causing the limitations in this case.  Applied some
formatting fixed to for the use of the include word.

(From yocto-docs rev: cbbd960d8665d9fb6b92698c14728d1c0bcc659f)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2016-07-14 12:54:34 -07:00
committed by Richard Purdie
parent acdfb5f3cc
commit bdf9003cfb
1 changed files with 9 additions and 7 deletions
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16
documentation/ref-manual/ref-variables.xml
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@@ -1001,19 +1001,21 @@
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
For example, to generate a native version of a recipe,
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.
Even when using <filename>BBCLASSEXTEND</filename>, the
recipe is only parsed once.
Parsing once adds some limitations.
For example, it is not possible to
include a different file depending on the variant,
since <filename>include</filename> statements are
processed when the recipe is parsed.
</para>
</note>
</para>