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CMP0138
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-------
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.. versionadded:: 3.24
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:module:`CheckIPOSupported` uses flags from calling project.
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The :module:`CheckIPOSupported` module :command:`check_ipo_supported`
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command compiles a test project to determine whether the toolchain
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supports :prop_tgt:`INTERPROCEDURAL_OPTIMIZATION`. CMake 3.23 and
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below run the check with the default values of the
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:variable:`CMAKE_<LANG>_FLAGS` and :variable:`CMAKE_<LANG>_FLAGS_<CONFIG>`
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variables for the current environment and toolchain settings.
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However, some projects may modify these flag variables to add
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flags that affect availability of the toolchain's IPO features.
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CMake 3.24 and above prefer to honor the calling project's values
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for these variables. This policy provides compatibility for projects
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that have not been updated to expect this behavior.
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The ``OLD`` behavior for this policy is to ignore the calling
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project's values of :variable:`CMAKE_<LANG>_FLAGS` and
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:variable:`CMAKE_<LANG>_FLAGS_<CONFIG>`. The ``NEW`` behavior
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for this policy is to use the values of those variables as
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compiler flags in the test project.
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.24
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.. |WARNS_OR_DOES_NOT_WARN| replace:: does *not* warn
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.. include:: STANDARD_ADVICE.txt
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.. include:: DEPRECATED.txt
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