Fix OpenMP support for Clang on macOS

Author: ruberith

CMake/Common.cmake

@@ -64,8 +64,12 @@ option(USE_OpenMP "Use OpenMP" ON)
 if(USE_OpenMP)
 	FIND_PACKAGE(OpenMP)
 	if(OPENMP_FOUND)
-		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
-		SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+		if (CMAKE_VERSION VERSION_GREATER "3.8")
+			link_libraries(OpenMP::OpenMP_CXX)
+		else()
+			SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
+			SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+		endif()
 	endif()
 endif()