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bitbake: bitbake-user-manual: Added setting variable for a single task 

Fixes [YOCTO #10095]

I added a third case to the "Conditional Metadata" section to
describe setting a variable for a single task.

(Bitbake rev: 24d648ce62b35f7d2b23fde732703c060579a0d2)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark 2016-08-08 09:38:00 -07:00 committed by Richard Purdie
parent 277a5a969f
commit cbf8516c08
1 changed files with 28 additions and 0 deletions
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28
bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
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@ -557,6 +557,34 @@
KERNEL_FEATURES_append_qemux86-64=" cfg/sound.scc cfg/paravirt_kvm.scc"
</literallayout>
</para></listitem>
<listitem><para><emphasis>Setting a Variable for a Single Task:</emphasis>
BitBake supports setting a variable just for the
duration of a single task.
Here is an example:
<literallayout class='monospaced'>
FOO_task-configure = "val 1"
FOO_task-compile = "val 2"
</literallayout>
In the previous example, <filename>FOO</filename>
has the value "val 1" while the
<filename>do_configure</filename> task is executed,
and the value "val 2" while the
<filename>do_compile</filename> task is executed.
</para>
<para>Internally, this is implemented by prepending
the task (e.g. "task-compile:") to the value of
<link linkend='var-OVERRIDES'><filename>OVERRIDES</filename></link>
for the local datastore of the <filename>do_compile</filename>
task.</para>
<para>You can also use this syntax with other combinations
(e.g. "<filename>_prepend</filename>") as shown in the
following example:
<literallayout class='monospaced'>
EXTRA_OEMAKE_prepend_task-compile = "${PARALLEL_MAKE} "
</literallayout>
</para></listitem>
</itemizedlist>
</para>
</section>