add USE_CUDA in CXX_FLAGS

CMakeLists.txt

@@ -67,10 +67,12 @@ INCLUDE_DIRECTORIES ( ./ ${Trilinos_INCLUDE_DIRS} ${Trilinos_TPL_INCLUDE_DIRS})
 LINK_DIRECTORIES    (${Trilinos_LIBRARY_DIRS} ${Trilinos_TPL_LIBRARY_DIRS})
 
 option (USE_CUDA "if true MPI+CUDA (needs Trilinos with Cuda support), if false MPI+OpenMP" OFF)
+message(STATUS "USE_CUDA enabled : ${USE_CUDA}")	   
 IF (USE_CUDA)
-  ADD_DEFINITIONS(-DUSE_CUDA)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DUSE_CUDA")
 ENDIF()
 
+
 MACRO(ADD_TEST TEST_NAME)
   ADD_EXECUTABLE(${TEST_NAME} ${TEST_NAME}.cpp)
   TARGET_LINK_LIBRARIES(${TEST_NAME}