Build fix compining with OpenMP

Author: Meinersbur

flang-rt/cmake/modules/AddFlangRTOffload.cmake

@@ -88,16 +88,16 @@ macro(enable_omp_offload_compilation name files)
         "${FLANG_RT_DEVICE_ARCHITECTURES}"
         )
 
-      set(OMP_COMPILE_OPTIONS
-        -fopenmp
-        -fvisibility=hidden
-        -fopenmp-cuda-mode
-        --offload-arch=${compile_for_architectures}
-        # Force LTO for the device part.
-        -foffload-lto
-        )
-      set_source_files_properties(${files} PROPERTIES COMPILE_OPTIONS
-        "${OMP_COMPILE_OPTIONS}"
+      set(OMP_COMPILE_OPTIONS $<$<COMPILE_LANGUAGE:C,CXX>:
+          -fopenmp -fvisibility=hidden -fopenmp-cuda-mode --offload-arch=${compile_for_architectures}
+          # Force LTO for the device part.
+          -foffload-lto
+        >)
+      #set_source_files_properties(${files} PROPERTIES COMPILE_OPTIONS
+      #  "${OMP_COMPILE_OPTIONS}"
+      #  )
+      set_property(SOURCE   ${files}  APPEND
+        PROPERTY COMPILE_DEFINITIONS ${OMP_COMPILE_OPTIONS}
         )
       target_link_options(${name}.static PUBLIC ${OMP_COMPILE_OPTIONS})