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| -rw-r--r-- | Help/policy/CMP0089.rst | 30 |
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diff --git a/Help/policy/CMP0089.rst b/Help/policy/CMP0089.rst new file mode 100644 index 0000000..e549e0c --- /dev/null +++ b/Help/policy/CMP0089.rst @@ -0,0 +1,30 @@ +CMP0089 +------- + +Compiler id for IBM Clang-based XL compilers is now ``XLClang``. + +CMake 3.15 and above recognize that IBM's Clang-based XL compilers +that define ``__ibmxl__`` are a new front-end distinct from ``xlc`` +with a different command line and set of capabilities. +CMake now prefers to present this to projects by setting the +:variable:`CMAKE_<LANG>_COMPILER_ID` variable to ``XLClang`` instead +of ``XL``. However, existing projects may assume the compiler id for +Clang-based XL is just ``XL`` as it was in CMake versions prior to 3.15. +Therefore this policy determines for Clang-based XL compilers which +compiler id to report in the :variable:`CMAKE_<LANG>_COMPILER_ID` +variable after language ``<LANG>`` is enabled by the :command:`project` +or :command:`enable_language` command. The policy must be set prior +to the invocation of either command. + +The OLD behavior for this policy is to use compiler id ``XL``. The +NEW behavior for this policy is to use compiler id ``XLClang``. + +This policy was introduced in CMake version 3.15. Use the +:command:`cmake_policy` command to set this policy to OLD or NEW explicitly. +Unlike most policies, CMake version |release| does *not* warn +by default when this policy is not set and simply uses OLD behavior. +See documentation of the +:variable:`CMAKE_POLICY_WARNING_CMP0089 <CMAKE_POLICY_WARNING_CMP<NNNN>>` +variable to control the warning. + +.. include:: DEPRECATED.txt |