Test that backend is CUDA before using CUDA-specifics in temporary_allocator.

To handle the case that we are using nvcc to compile non-CUDA, e.g.
OMP, code, test that the backend THRUST_DEVICE_SYSTEM is
THRUST_DEVICE_SYSTEM_CUDA before including and using CUDA-specific
code, terminate_with_message().

Author: hwinkler

thrust/detail/allocator/temporary_allocator.inl

@@ -20,7 +20,7 @@
 #include <thrust/system/detail/bad_alloc.h>
 #include <cassert>
 
-#ifdef __CUDACC__
+#if defined(__CUDA_ARCH__) && THRUST_DEVICE_SYSTEM == THRUST_DEVICE_SYSTEM_CUDA
 #include <thrust/system/cuda/detail/terminate.h>
 #endif
 
@@ -47,7 +47,7 @@ __host__ __device__
 
 #if !defined(__CUDA_ARCH__)
     throw thrust::system::detail::bad_alloc("temporary_buffer::allocate: get_temporary_buffer failed");
-#else
+#elif THRUST_DEVICE_SYSTEM == THRUST_DEVICE_SYSTEM_CUDA
     thrust::system::cuda::detail::terminate_with_message("temporary_buffer::allocate: get_temporary_buffer failed");
 #endif
   } // end if