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documentation/poky-ref-manual/ref-variables.xml: update PREFERRED_VERSION 

Added a more robust description and provided a couple of usage
examples.

(From yocto-docs rev: b8b842b57cc003f1351a551041fe4b3de2fcbfd6)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark 2011-09-27 06:51:38 -07:00 committed by Richard Purdie
parent 23bac7cb0e
commit 38c7a8a069
1 changed files with 12 additions and 2 deletions
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documentation/poky-ref-manual/ref-variables.xml
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@ -842,8 +842,18 @@
<para> <para>
If there are multiple versions of recipes available, this If there are multiple versions of recipes available, this
variable determines which recipe should be given preference. variable determines which recipe should be given preference.
The variable should be set to the <filename>$PV</filename> of the recipe The variable must always be suffixed with the <filename>$PN</filename>
to whichy you want to give precedence. for which to select, and should be set to the
<filename>$PV</filename> to which you want to give precedence.
You can use the "<filename>%</filename>" character as a wildcard
to match any number of characters, which can be useful when
specifying versions that contain long revision number that could
potentially change.
Here are two examples:
<literallayout class='monospaced'>
PREFERRED_VERSION_python = "2.6.6"
PREFERRED_VERSION_linux-yocto = "3.0+git%"
</literallayout>
</para> </para>
</glossdef> </glossdef>
</glossentry> </glossentry>