| CMP0089 |
| ------- |
| |
| .. versionadded:: 3.15 |
| |
| 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 |