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Brad King authored
Re-organize CMakeDetermine(C|CXX|Fortran)Compiler.cmake to search for the compiler command-line tool only under generators for which it makes sense. For the Visual Studio generators we do not expect to find the compiler tool from the environment, nor would we use the result anyway. Furthermore, set CMAKE_${lang}_COMPILER_ID_TEST_FLAGS only when it has a chance to be used. Extract _CMAKE_TOOLCHAIN_LOCATION from the compiler path after running the compiler id step so in the future that step can help find the path to the compiler.
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