[CMake] CMAKE_<lang>_COMPILER_ID not set on Darwin

[Thomas Nilsson]

I was looking for a way to identify the compiler as clang to know if I should pass it a clang specific flag ("-x c++").

On Darwin default compiler is Clang used through /usr/bin/cc and and /usr/bin/c++. The identification is clearly signaled as "Clang 4.1.0" but CMAKE_CXX_COMPILER_ID is not set. Obviously CMAKE_CXX_COMPILER is set to /usr/bin/c++.

Given my belief that CMAKE_CXX_COMPILER_ID will not be implemented soon, what are my options?

Thomas

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