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| author |   Scott Rifenbark <srifenbark@gmail.com> | 2016-07-22 08:36:09 -0700 |
|---|---|---|
| committer |   Richard Purdie <richard.purdie@linuxfoundation.org> | 2016-08-02 15:22:15 +0100 |
| commit | f0e73a4b65b8632bf9c9642faf8e1b22a628d88e (patch) | |
| tree | 14424d3101caa5d0fc65195a50d36dca62d53973 /bitbake/doc | |
| parent | 41b49cadd3367b3afea6c30758f40c996bf9a97e (diff) | |
| download | openembedded-core-contrib-f0e73a4b65b8632bf9c9642faf8e1b22a628d88e.tar.gz | |
bitbake: bitbake-user-manual: Added non-existant variable expansion
Fixes [YOCTO #10003]
I added a small paragraph explaining what happens when expansion
of a variable that does not exist occurs.
(Bitbake rev: 8006da3f229d0227215ccd59cd273edacf72f9ce)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'bitbake/doc')
| -rw-r--r-- | bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml index fe04103dae..ce0e84db02 100644 --- a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml +++ b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml @@ -86,6 +86,17 @@ <link linkend='immediate-variable-expansion'>immediate variable expansion</link> operator (i.e. ":="). </para> + + <para> + If the variable expansion syntax is used on a variable that + does not exist, the string is kept as is. + For example, given the following assignment, + <filename>BAR</filename> expands to the literal string + "${FOO}" as long as <filename>FOO</filename> does not exist. + <literallayout class='monospaced'> + BAR = "${FOO}" + </literallayout> + </para> </section> <section id='setting-a-default-value'> |