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| -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'> |