Tests/RunCMake/ToolchainFile/SetCompilerLoaded.cmake - third_party/github.com/Kitware/CMake - Git at Google

 enable_language(C)
 try_compile(SHOULD_PASS SOURCE_FROM_CONTENT "main.c" "int main(void) { return 0; }")
 if(NOT SHOULD_PASS)
   message(FATAL_ERROR "try_compile failed but should have passed!")
 endif()
	enable_language(C)
	try_compile(SHOULD_PASS SOURCE_FROM_CONTENT "main.c" "int main(void) { return 0; }")
	if(NOT SHOULD_PASS)
	message(FATAL_ERROR "try_compile failed but should have passed!")
	endif()