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author | Scott Rifenbark <srifenbark@gmail.com> | 2016-07-22 08:36:09 -0700 |
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committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2016-08-02 15:20:38 +0100 |
commit | 8006da3f229d0227215ccd59cd273edacf72f9ce (patch) | |
tree | c4f51f249f797a7e46531cf14ecba3c5006d4f2c | |
parent | d8ae3775eefe3f7b62fc26cae5b742ae83850c13 (diff) | |
download | bitbake-contrib-8006da3f229d0227215ccd59cd273edacf72f9ce.tar.gz |
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.
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
-rw-r--r-- | doc/bitbake-user-manual/bitbake-user-manual-metadata.xml | 11 |
1 files changed, 11 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 fe04103da..ce0e84db0 100644 --- a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml +++ b/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'> |