Fix OpenMP support for Clang on macOS

Author: ruberith

CMakeLists.txt

@@ -11,7 +11,11 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 if (UNIX)
 find_package(OpenMP)
 if (OPENMP_FOUND)
-	set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+	if (CMAKE_VERSION VERSION_GREATER "3.8")
+		link_libraries(OpenMP::OpenMP_CXX)
+	else()
+		set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+	endif()
 endif(OPENMP_FOUND)
 endif (UNIX)