Tests/CudaOnly/Architecture/main.cu - third_party/github.com/Kitware/CMake - Git at Google

 #ifdef __CUDA_ARCH__
 #  if __CUDA_ARCH__ != 520
 #    error "Passed architecture 52, but got something else."
 #  endif
 #endif

 int main()
 {
 }
	#ifdef __CUDA_ARCH__
	# if __CUDA_ARCH__ != 520
	# error "Passed architecture 52, but got something else."
	# endif
	#endif

	int main()
	{
	}