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36 lines
1.6 KiB
ReStructuredText
36 lines
1.6 KiB
ReStructuredText
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CMP0018
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-------
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Ignore ``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` variable.
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CMake 2.8.8 and lower compiled sources in ``SHARED`` and ``MODULE`` libraries
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using the value of the undocumented ``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS``
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platform variable. The variable contained platform-specific flags
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needed to compile objects for shared libraries. Typically it included
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a flag such as ``-fPIC`` for position independent code but also included
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other flags needed on certain platforms. CMake 2.8.9 and higher
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prefer instead to use the :prop_tgt:`POSITION_INDEPENDENT_CODE` target
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property to determine what targets should be position independent, and new
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undocumented platform variables to select flags while ignoring
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``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` completely.
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The default for either approach produces identical compilation flags,
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but if a project modifies ``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` from its
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original value this policy determines which approach to use.
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The ``OLD`` behavior for this policy is to ignore the
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:prop_tgt:`POSITION_INDEPENDENT_CODE` property for all targets and use the
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modified value of ``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` for ``SHARED`` and
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``MODULE`` libraries.
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The ``NEW`` behavior for this policy is to ignore
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``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` whether it is modified or not and
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honor the :prop_tgt:`POSITION_INDEPENDENT_CODE` target property.
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This policy was introduced in CMake version 2.8.9. CMake version
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|release| warns when the policy is not set and uses ``OLD`` behavior. Use
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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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