Identify CrayClang as Clang (#1813)

Author: havogt

cmake/public/detect_features.cmake

@@ -46,7 +46,7 @@ endfunction()
 #       - Clang-CUDA: Try Clang-CUDA or fail.
 #       - NVCC-CUDA: Try NVCC-CUDA or fail.
 function(detect_cuda_type cuda_type mode)
-    if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    if(NOT (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "CrayClang"))
         # not Clang, therefore the only option is NVCC
         try_nvcc_cuda(gt_result)
         set(${cuda_type} ${gt_result} PARENT_SCOPE)