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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>
This commit is contained in:
Scott Rifenbark 2016-07-22 08:36:09 -07:00 committed by Richard Purdie
parent 41b49cadd3
commit f0e73a4b65
1 changed files with 11 additions and 0 deletions
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11
bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
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@ -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'>