diff options
Diffstat (limited to 'bitbake/doc/bitbake-user-manual')
-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 @@ | |||
86 | <link linkend='immediate-variable-expansion'>immediate variable expansion</link> | 86 | <link linkend='immediate-variable-expansion'>immediate variable expansion</link> |
87 | operator (i.e. ":="). | 87 | operator (i.e. ":="). |
88 | </para> | 88 | </para> |
89 | |||
90 | <para> | ||
91 | If the variable expansion syntax is used on a variable that | ||
92 | does not exist, the string is kept as is. | ||
93 | For example, given the following assignment, | ||
94 | <filename>BAR</filename> expands to the literal string | ||
95 | "${FOO}" as long as <filename>FOO</filename> does not exist. | ||
96 | <literallayout class='monospaced'> | ||
97 | BAR = "${FOO}" | ||
98 | </literallayout> | ||
99 | </para> | ||
89 | </section> | 100 | </section> |
90 | 101 | ||
91 | <section id='setting-a-default-value'> | 102 | <section id='setting-a-default-value'> |