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>
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<para>
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If there are multiple versions of recipes available, this
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variable determines which recipe should be given preference.
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The variable should be set to the <filename>$PV</filename> of the recipe
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to whichy you want to give precedence.
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The variable must always be suffixed with the <filename>$PN</filename>
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for which to select, and should be set to the
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<filename>$PV</filename> to which you want to give precedence.
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You can use the "<filename>%</filename>" character as a wildcard
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to match any number of characters, which can be useful when
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specifying versions that contain long revision number that could
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potentially change.
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Here are two examples:
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<literallayout class='monospaced'>
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PREFERRED_VERSION_python = "2.6.6"
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PREFERRED_VERSION_linux-yocto = "3.0+git%"
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</literallayout>
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</para>
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</glossdef>
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</glossentry>
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