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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 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 a target,
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the name of each dependency could either be a target, or a file on disk.
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Previously, if a target was not found with a matching name, the name was
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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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The OLD behavior for this policy is to search for targets, then files on disk,
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even if the search term contains double-colons. The NEW behavior for this
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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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This policy was introduced in CMake version 3.0. CMake version
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|release| warns when the policy is not set and uses OLD behavior. Use
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the cmake_policy command to set it to OLD or NEW explicitly.
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.. include:: DEPRECATED.txt
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