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Compiler id for Apple Clang is now AppleClang.

CMake 3.0 and above recognize that Apple Clang is a different compiler than upstream Clang and that they have different version numbers. CMake now prefers to present this to projects by setting the :variable:CMAKE_<LANG>_COMPILER_ID variable to AppleClang instead of Clang. However, existing projects may assume the compiler id for Apple Clang is just Clang as it was in CMake versions prior to 3.0. Therefore this policy determines for Apple Clang 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 Clang. The NEW behavior for this policy is to use compiler id AppleClang.

This policy was introduced in CMake version 3.0. 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_CMP0025 <CMAKE_POLICY_WARNING_CMP<NNNN>> variable to control the warning.

.. include:: DEPRECATED.txt