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Every policy's documentation has a paragraph on what version of CMake introduced it, how to set the policy, and whether CMake warns if the policy is not set. The wording of this paragraph has diverged across policies over time. Factor the paragraph out into a standard advice document included by every policy.
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33 lines
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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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