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CMP0089
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-------
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.. versionadded:: 3.15
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Compiler id for IBM Clang-based XL compilers is now ``XLClang``.
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CMake 3.15 and above recognize that IBM's Clang-based XL compilers
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that define ``__ibmxl__`` are a new front-end distinct from ``xlc``
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with a different command line and set of capabilities.
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CMake now prefers to present this to projects by setting the
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:variable:`CMAKE_<LANG>_COMPILER_ID` variable to ``XLClang`` instead
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of ``XL``. However, existing projects may assume the compiler id for
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Clang-based XL is just ``XL`` as it was in CMake versions prior to 3.15.
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Therefore this policy determines for Clang-based XL compilers which
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compiler id to report in the :variable:`CMAKE_<LANG>_COMPILER_ID`
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variable after language ``<LANG>`` is enabled by the :command:`project`
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or :command:`enable_language` command. The policy must be set prior
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to the invocation of either command.
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The ``OLD`` behavior for this policy is to use compiler id ``XL``. The
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``NEW`` behavior for this policy is to use compiler id ``XLClang``.
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.15
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.. |WARNS_OR_DOES_NOT_WARN| replace:: does *not* warn by default
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.. include:: STANDARD_ADVICE.txt
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See documentation of the
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:variable:`CMAKE_POLICY_WARNING_CMP0089 <CMAKE_POLICY_WARNING_CMP<NNNN>>`
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variable to control the warning.
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.. include:: DEPRECATED.txt
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