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bitbake: bitbake-user-manual: Added a note providing examples of task dependencies

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Fixes [YOCTO #9861]

In the "Dependencies internal to the .bb File" section, I placed a
note providing more detail on how recipes are built regarding task
dependency.

(Bitbake rev: c2e72928fbd21d622860a54a55f4239ba27c07a2)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2016-07-12 13:41:12 -07:00
committed by Richard Purdie
parent d918df7e8e
commit 8c55a9cf88
1 changed files with 34 additions and 0 deletions
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bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
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@@ -1670,6 +1670,40 @@
task. task.
And, the <filename>do_build</filename> depends on the completion And, the <filename>do_build</filename> depends on the completion
of the <filename>printdate</filename> task. of the <filename>printdate</filename> task.
<note>
Recipes are built by having their
<filename>do_build</filename> (not to be confused with
<filename>do_compile</filename>) tasks executed.
For a task to run when a recipe is built, the task must
therefore be a direct or indirect dependency of
<filename>do_build</filename>.
For illustration, here are some examples:
<itemizedlist>
<listitem><para>
The directive
<filename>addtask mytask before do_build</filename>
causes <filename>mytask</filename> to run when the
recipe is built.
In this example, <filename>mytask</filename> is run
at an unspecified time relative to other tasks within
the recipe, since "after" is not used.
</para></listitem>
<listitem><para>
The directive
<filename>addtask mytask after do_configure</filename>
by itself does not cause <filename>mytask</filename>
to run when the recipe is built.
The task can still be run manually using the following:
<literallayout class='monospaced'>
$ bitbake <replaceable>recipe</replaceable> -c mytask
</literallayout>
<filename>mytask</filename> could also be declared as
a dependency of some other task.
Regardless, the task is run after
<filename>do_configure</filename>.
</para></listitem>
</itemizedlist>
</note>
</para> </para>
</section> </section>