only add -lomp if it's not in CMAKE_EXE_LINKER_FLAGS

Author: trongnhanuit

CMakeLists.txt

@@ -188,7 +188,9 @@ if (NOT CMAPLE_FLAGS MATCHES "single")
             else()
                 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Xpreprocessor -fopenmp -pthread")
             endif()
-            set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lomp")
+            if(NOT "${CMAKE_EXE_LINKER_FLAGS}" MATCHES "-lomp")
+    			set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lomp")
+			endif()
         else()
             set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp")
         endif()