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| author |   Scott Rifenbark <srifenbark@gmail.com> | 2016-07-21 11:02:52 -0700 |
|---|---|---|
| committer |   Richard Purdie <richard.purdie@linuxfoundation.org> | 2016-08-02 15:20:10 +0100 |
| commit | 64bf49826088c56b739ed971251f05b4564c712e (patch) | |
| tree | e63a94b737a59cf60445edba77e269187b6e3111 /doc | |
| parent | 5c5b88e402376268baa15c5d04d2592f28d76751 (diff) | |
| download | bitbake-64bf49826088c56b739ed971251f05b4564c712e.tar.gz | |
bitbake-user-manual: Updated the "Inline Python Variable Expansion" section.
Fixes [YOCTO #9984]
Added a small note to the bottom to help clarify.
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/bitbake-user-manual/bitbake-user-manual-metadata.xml | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml b/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml index 436abd5ec..f7b541d9d 100644 --- a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml +++ b/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml @@ -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> |