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Other check modules honor this variable, so include file checks should too. Add policy `CMP0075` to enable the behavior in a compatible way. This change was originally made by commit v3.11.0-rc1~108^2 (CheckIncludeFiles: Honor CMAKE_REQUIRED_LIBRARIES, 2017-12-24) but it was reverted by commit v3.11.1~9^2 (Revert "CheckIncludeFiles: Honor CMAKE_REQUIRED_LIBRARIES", 2018-04-04) because the behavior change could affect checks in existing projects in an incompatible way. Fixes: #9514
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27 lines
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CMP0075
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Include file check macros honor ``CMAKE_REQUIRED_LIBRARIES``.
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In CMake 3.12 and above, the
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* ``check_include_file`` macro in the :module:`CheckIncludeFile` module, the
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* ``check_include_file_cxx`` macro in the
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:module:`CheckIncludeFileCXX` module, and the
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* ``check_include_files`` macro in the :module:`CheckIncludeFiles` module
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now prefer to link the check executable to the libraries listed in the
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``CMAKE_REQUIRED_LIBRARIES`` variable. This policy provides compatibility
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with projects that have not been updated to expect this behavior.
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The ``OLD`` behavior for this policy is to ignore ``CMAKE_REQUIRED_LIBRARIES``
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in the include file check macros. The ``NEW`` behavior of this policy is to
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honor ``CMAKE_REQUIRED_LIBRARIES`` in the include file check macros.
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This policy was introduced in CMake version 3.12. 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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