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Help: Add notes for topic 'link_what_you_use'

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Brad King 2016-06-17 10:59:56 -04:00
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link_what_you_use
-----------------
* A :prop_tgt:`LINK_WHAT_YOU_USE` target property and supporting
:variable:`CMAKE_LINK_WHAT_YOU_USE` variable were introduced
to detect (on UNIX) shared libraries that are linked but not
needed by running ``ldd -r -u``.