cmake / 3.6.3 / variable / cmake_lang_compiler_loaded.html /

CMAKE_<LANG>_COMPILER_LOADED

Defined to true if the language is enabled.

When language <LANG> is enabled by project() or enable_language() this variable is defined to 1.

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https://cmake.org/cmake/help/v3.6/variable/CMAKE_LANG_COMPILER_LOADED.html