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CMP0028
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-------
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Double colon in target name means ``ALIAS`` or ``IMPORTED`` target.
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CMake 2.8.12 and lower allowed the use of targets and files with double
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colons in :command:`target_link_libraries`, with some buildsystem generators.
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The use of double-colons is a common pattern used to namespace ``IMPORTED``
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targets and ``ALIAS`` targets. When computing the link dependencies of
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a target, the name of each dependency could either be a target, or a file
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on disk. Previously, if a target was not found with a matching name, the name
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was considered to refer to a file on disk. This can lead to confusing error
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messages if there is a typo in what should be a target name.
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See also the :prop_tgt:`LINK_LIBRARIES_ONLY_TARGETS` target property.
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The ``OLD`` behavior for this policy is to search for targets, then files on
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disk, even if the search term contains double-colons. The ``NEW`` behavior
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for this policy is to issue a ``FATAL_ERROR`` if a link dependency contains
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double-colons but is not an ``IMPORTED`` target or an ``ALIAS`` target.
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.0
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.. |WARNS_OR_DOES_NOT_WARN| replace:: warns
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.. include:: STANDARD_ADVICE.txt
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.. include:: DEPRECATED.txt
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