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authorScott Rifenbark <srifenbark@gmail.com>2016-07-22 08:36:09 -0700
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-08-02 15:22:15 +0100
commitf0e73a4b65b8632bf9c9642faf8e1b22a628d88e (patch)
tree14424d3101caa5d0fc65195a50d36dca62d53973 /bitbake/doc/bitbake-user-manual
parent41b49cadd3367b3afea6c30758f40c996bf9a97e (diff)
downloadpoky-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/bitbake-user-manual')
-rw-r--r--bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml11
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'>