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diff --git a/Help/policy/CMP0129.rst b/Help/policy/CMP0129.rst new file mode 100644 index 0000000..31a26e5 --- /dev/null +++ b/Help/policy/CMP0129.rst @@ -0,0 +1,34 @@ +CMP0129 +------- + +.. versionadded:: 3.23 + +Compiler id for MCST LCC compilers is now ``LCC``, not ``GNU``. + +CMake 3.23 and above recognize MCST LCC compiler as a different from ``GNU``, +with its own command line and set of capabilities. +CMake now prefers to present this to projects by setting the +:variable:`CMAKE_<LANG>_COMPILER_ID` variable to ``LCC`` instead +of ``GNU``. However, existing projects may assume the compiler id for +LCC is ``GNU`` as it was in CMake versions prior to 3.23. +Therefore this policy determines for MCST LCC compiler 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 ``GNU`` (and set +:variable:`CMAKE_<LANG>_COMPILER_VERSION` to the supported GNU compiler version.) +``NEW`` behavior for this policy is to use compiler id ``LCC``, and set +:variable:`CMAKE_<LANG>_SIMULATE_ID` to ``GNU``, and +:variable:`CMAKE_<LANG>_SIMULATE_VERSION` to the supported GNU compiler version. + +This policy was introduced in CMake version 3.23. 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_CMP0129 <CMAKE_POLICY_WARNING_CMP<NNNN>>` +variable to control the warning. + +.. include:: DEPRECATED.txt |