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bitbake: ast/ConfHandler: Add a syntax to clear variable

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unset VAR
will clear variable VAR
unset VAR[flag]
will clear flag "flag" from var VAR

(Bitbake rev: bedbd46ece8d1285b5cd2ea07dc64b4875b479aa)

Signed-off-by: Jérémy Rosen <jeremy.rosen@openwide.fr>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Jérémy Rosen
2016-08-16 14:04:47 +02:00
committed by Richard Purdie
parent b50b14e372
commit 0eb6d709b6
4 changed files with 79 additions and 0 deletions
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bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
+17
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@@ -435,6 +435,23 @@
</para>
</section>
<section id='unsetting-variables'>
<title>Unseting variables</title>
<para>
It is possible to completely remove a variable or a variable flag
from BitBake's internal data dictionary by using the "unset" keyword.
Here is an example:
<literallayout class='monospaced'>
unset DATE
unset do_fetch[noexec]
</literallayout>
These two statements remove the <filename>DATE</filename> and the
<filename>do_fetch[noexec]</filename> flag.
</para>
</section>
<section id='providing-pathnames'>
<title>Providing Pathnames</title>