Make clang defs only in clang env.

src/gpu/VirtualFluids_GPU/GPU/CudaMemoryManager.h

@@ -14,11 +14,15 @@
 #include <helper_cuda.h>
 
 #include <curand.h>
+#ifdef __clang__
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wgnu-zero-variadic-macro-arguments"
 #pragma clang diagnostic ignored "-Wunused-but-set-parameter"
+#endif
 #include <curand_kernel.h>
+#ifdef __clang__
 #pragma clang diagnostic pop
+#endif
 
 class Parameter;
 class PorousMedia;

src/gpu/VirtualFluids_GPU/GPU/GPU_Interface.h

@@ -14,11 +14,15 @@
 #include <cuda_runtime.h>
 #include <curand.h>
 
+#ifdef __clang__
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wgnu-zero-variadic-macro-arguments"
 #pragma clang diagnostic ignored "-Wunused-but-set-parameter"
+#endif
 #include <curand_kernel.h>
+#ifdef __clang__
 #pragma clang diagnostic pop
+#endif
 
 struct LBMSimulationParameter;
 class Parameter;