CUDA: Perform CUDA toolkit include directory detection only on nvcc

The code is specific to nvcc.

Modules/CMakeDetermineCUDACompiler.cmake

@@ -86,7 +86,7 @@ if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
   set(CMAKE_CUDA_HOST_IMPLICIT_LINK_LIBRARIES "")
   set(CMAKE_CUDA_HOST_IMPLICIT_LINK_DIRECTORIES "")
   set(CMAKE_CUDA_HOST_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES "")
-elseif(CMAKE_CUDA_COMPILER_ID STREQUAL NVIDIA)
+elseif(CMAKE_CUDA_COMPILER_ID STREQUAL "NVIDIA")
   set(_nvcc_log "")
   string(REPLACE "\r" "" _nvcc_output_orig "${CMAKE_CUDA_COMPILER_PRODUCED_OUTPUT}")
   if(_nvcc_output_orig MATCHES "#\\\$ +PATH= *([^\n]*)\n")
@@ -188,30 +188,33 @@ elseif(CMAKE_CUDA_COMPILER_ID STREQUAL NVIDIA)
   endif()
 endif()
 
-set(CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES )
-string(REPLACE "\r" "" _nvcc_output_orig "${CMAKE_CUDA_COMPILER_PRODUCED_OUTPUT}")
-if(_nvcc_output_orig MATCHES "#\\\$ +INCLUDES= *([^\n]*)\n")
-  set(_nvcc_includes "${CMAKE_MATCH_1}")
-  string(APPEND _nvcc_log "  found 'INCLUDES=' string: [${_nvcc_includes}]\n")
-else()
-  set(_nvcc_includes "")
-  string(REPLACE "\n" "\n    " _nvcc_output_log "\n${_nvcc_output_orig}")
-  string(APPEND _nvcc_log "  no 'INCLUDES=' string found in nvcc output:${_nvcc_output_log}\n")
-endif()
-if(_nvcc_includes)
-  # across all operating system each include directory is prefixed with -I
-  separate_arguments(_nvcc_output NATIVE_COMMAND "${_nvcc_includes}")
-  foreach(line IN LISTS _nvcc_output)
-    string(REGEX REPLACE "^-I" "" line "${line}")
-    get_filename_component(line "${line}" ABSOLUTE)
-    list(APPEND CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES "${line}")
-  endforeach()
-
-  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
-    "Parsed CUDA nvcc include information from above output:\n${_nvcc_log}\n${log}\n\n")
-else()
-  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
-    "Failed to detect CUDA nvcc include information:\n${_nvcc_log}\n\n")
+# Determine CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES
+if(CMAKE_CUDA_COMPILER_ID STREQUAL "NVIDIA")
+  set(CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES)
+  string(REPLACE "\r" "" _nvcc_output_orig "${CMAKE_CUDA_COMPILER_PRODUCED_OUTPUT}")
+  if(_nvcc_output_orig MATCHES "#\\\$ +INCLUDES= *([^\n]*)\n")
+    set(_nvcc_includes "${CMAKE_MATCH_1}")
+    string(APPEND _nvcc_log "  found 'INCLUDES=' string: [${_nvcc_includes}]\n")
+  else()
+    set(_nvcc_includes "")
+    string(REPLACE "\n" "\n    " _nvcc_output_log "\n${_nvcc_output_orig}")
+    string(APPEND _nvcc_log "  no 'INCLUDES=' string found in nvcc output:${_nvcc_output_log}\n")
+  endif()
+  if(_nvcc_includes)
+    # across all operating system each include directory is prefixed with -I
+    separate_arguments(_nvcc_output NATIVE_COMMAND "${_nvcc_includes}")
+    foreach(line IN LISTS _nvcc_output)
+      string(REGEX REPLACE "^-I" "" line "${line}")
+      get_filename_component(line "${line}" ABSOLUTE)
+      list(APPEND CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES "${line}")
+    endforeach()
+
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+      "Parsed CUDA nvcc include information from above output:\n${_nvcc_log}\n${log}\n\n")
+  else()
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+      "Failed to detect CUDA nvcc include information:\n${_nvcc_log}\n\n")
+  endif()
 endif()
 
 # configure all variables set in this file