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43 lines
2.1 KiB
ReStructuredText
43 lines
2.1 KiB
ReStructuredText
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CMP0079
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-------
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.. versionadded:: 3.13
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:command:`target_link_libraries` allows use with targets in other directories.
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Prior to CMake 3.13 the :command:`target_link_libraries` command did not
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accept targets not created in the calling directory as its first argument
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for calls that update the :prop_tgt:`LINK_LIBRARIES` of the target itself.
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It did accidentally accept targets from other directories on calls that
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only update the :prop_tgt:`INTERFACE_LINK_LIBRARIES`, but would simply
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add entries to the property as if the call were made in the original
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directory. Thus link interface libraries specified this way were always
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looked up by generators in the scope of the original target rather than
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in the scope that called :command:`target_link_libraries`.
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CMake 3.13 now allows the :command:`target_link_libraries` command to
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be called from any directory to add link dependencies and link interface
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libraries to targets created in other directories. The entries are added
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to :prop_tgt:`LINK_LIBRARIES` and :prop_tgt:`INTERFACE_LINK_LIBRARIES`
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using a special (internal) suffix to tell the generators to look up the
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names in the calling scope rather than the scope that created the target.
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This policy provides compatibility with projects that already use
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:command:`target_link_libraries` with the ``INTERFACE`` keyword
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on a target in another directory to add :prop_tgt:`INTERFACE_LINK_LIBRARIES`
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entries to be looked up in the target's directory. Such projects should
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be updated to be aware of the new scoping rules in that case.
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The ``OLD`` behavior of this policy is to disallow
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:command:`target_link_libraries` calls naming targets from another directory
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except in the previously accidentally allowed case of using the ``INTERFACE``
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keyword only. The ``NEW`` behavior of this policy is to allow all such
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calls but use the new scoping rules.
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This policy was introduced in CMake version 3.13. CMake version
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|release| warns when the policy is not set and uses ``OLD`` behavior.
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Use the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW``
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explicitly.
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.. include:: DEPRECATED.txt
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