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bitbake: bitbake-user-manual: Updated the "Inline Python Variable Expansion" section. 

Fixes [YOCTO #9984]

Added a small note to the bottom to help clarify.

(Bitbake rev: 64bf49826088c56b739ed971251f05b4564c712e)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark 2016-07-21 11:02:52 -07:00 committed by Richard Purdie
parent eb282b797e
commit a3a7ddf120
1 changed files with 16 additions and 1 deletions
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17
bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
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@ -316,7 +316,7 @@
</literallayout>
<note>
It is never necessary to use "+=" together with "_append".
The following sequence of assignments appepnds "barbaz" to
The following sequence of assignments appends "barbaz" to
<filename>FOO</filename>:
<literallayout class='monospaced'>
FOO_append = "bar"
@ -401,6 +401,21 @@
PN = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE', False),d)[0] or 'defaultpkgname'}"
PV = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE', False),d)[1] or '1.0'}"
</literallayout>
<note>
Inline Python expressions work just like variable expansions
insofar as the "=" and ":=" operators are concerned.
Given the following assignment, <filename>foo()</filename>
is called each time <filename>FOO</filename> is expanded:
<literallayout class='monospaced'>
FOO = "${@foo()}"
</literallayout>
Contrast this with the following immediate assignment, where
<filename>foo()</filename> is only called once, while the
assignment is parsed:
<literallayout class='monospaced'>
FOO := "${@foo()}"
</literallayout>
</note>
</para>
</section>