CMake

Add ability to build with Apple Clang #2251

Job	Run time
run_tests_gcc (Release)	29m 6s
run_tests_apple_clang (Release)	18m 39s
run_tests_gcc (Debug)	57m 1s
run_tests_apple_clang (Debug)	1h 37m 58s
run_tests_gcc (Debug, ADDRESS)	52m 19s
run_tests_apple_clang (Debug, ADDRESS)	35m 53s
run_tests_gcc (Debug, UB)	42m 29s
run_tests_apple_clang (Debug, UB)	29m 55s
run_tests_clang (Release)	38m 41s
run_tests_macos_clang (Release)	24m 1s
run_tests_clang (Debug)	3h 36m 55s
run_tests_macos_clang (Debug)	1h 43m 19s
run_tests_clang (Debug, ADDRESS)	47m 54s
run_tests_macos_clang (Debug, ADDRESS)	47m 25s
run_tests_clang (Debug, UB)	1h 6m 34s
run_tests_macos_clang (Debug, UB)	26m 50s
	15h 34m 59s

Provide feedback