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authorScott Rifenbark <srifenbark@gmail.com>2016-08-08 09:38:00 -0700
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-08-17 10:22:09 +0100
commit24d648ce62b35f7d2b23fde732703c060579a0d2 (patch)
tree5e67613c72ade7996f41ccfe75af3fe0b03c50e9 /doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
parentdbe25523d899850f85acb6986eca98bf1b0ef52a (diff)
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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. Signed-off-by: Scott Rifenbark <srifenbark@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'doc/bitbake-user-manual/bitbake-user-manual-metadata.xml')
-rw-r--r--doc/bitbake-user-manual/bitbake-user-manual-metadata.xml28
1 files changed, 28 insertions, 0 deletions
diff --git a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml b/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
index 4fa51c44..3d9234cb 100644
--- a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
+++ b/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
@@ -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>