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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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14
documentation/poky-ref-manual/ref-variables.xml
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@ -842,8 +842,18 @@
<para>
If there are multiple versions of recipes available, this
variable determines which recipe should be given preference.
The variable should be set to the <filename>$PV</filename> of the recipe
to whichy you want to give precedence.
The variable must always be suffixed with the <filename>$PN</filename>
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>
</glossdef>
</glossentry>