detect_compiler.cmake

function(check_compiling_with_clang result_var)
	if(NOT DEFINED ${result_var})
		string(TOLOWER "${CMAKE_C_COMPILER_ID}" LOWER_CASE_C_COMPILER_ID)
		string(TOLOWER "${CMAKE_CXX_COMPILER_ID}" LOWER_CASE_CXX_COMPILER_ID)
		if(LOWER_CASE_C_COMPILER_ID MATCHES "clang" AND LOWER_CASE_CXX_COMPILER_ID MATCHES "clang")
			set(${result_var} true PARENT_SCOPE)
		else()
			set(${result_var} false PARENT_SCOPE)
		endif()
	endif()
endfunction(check_compiling_with_clang)

function(check_compiling_with_gcc result_var)
	if(NOT DEFINED ${result_var})
		if(CMAKE_C_COMPILER_ID MATCHES "GNU" AND CMAKE_CXX_COMPILER_ID MATCHES "GNU")
			set(${result_var} true PARENT_SCOPE)
		else()
			set(${result_var} false PARENT_SCOPE)
		endif()
	endif()
endfunction(check_compiling_with_gcc)

function(check_compiling_with_msvc result_var)
	if(NOT DEFINED ${result_var})
		if(CMAKE_C_COMPILER_ID MATCHES "MSVC" AND CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
			set(${result_var} true PARENT_SCOPE)
		else()
			set(${result_var} false PARENT_SCOPE)
		endif()
	endif()
endfunction(check_compiling_with_msvc)