cuda: Extend cuda compiler detection to work with custom cuda path

Modules/CMakeDetermineCompilerId.cmake

@@ -347,8 +347,14 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
       set(cuda_tools "CUDA ${CMAKE_VS_PLATFORM_TOOLSET_CUDA}")
       set(id_compile "CudaCompile")
       set(id_PostBuildEvent_Command [[echo CMAKE_CUDA_COMPILER=$(CudaToolkitBinDir)\nvcc.exe]])
-      string(CONCAT id_Import_props [[<Import Project="$(VCTargetsPath)\BuildCustomizations\]] "${cuda_tools}" [[.props" />]])
-      string(CONCAT id_Import_targets [[<Import Project="$(VCTargetsPath)\BuildCustomizations\]] "${cuda_tools}" [[.targets" />]])
+      if(CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR)
+        set(id_CudaToolkitCustomDir "<CudaToolkitCustomDir>${CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR}nvcc</CudaToolkitCustomDir>")
+        string(CONCAT id_Import_props "<Import Project=\"${CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR}\\CUDAVisualStudioIntegration\\extras\\visual_studio_integration\\MSBuildExtensions\\${cuda_tools}.props\" />")
+        string(CONCAT id_Import_targets "<Import Project=\"${CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR}\\CUDAVisualStudioIntegration\\extras\\visual_studio_integration\\MSBuildExtensions\\${cuda_tools}.targets\" />")
+      else()
+        string(CONCAT id_Import_props [[<Import Project="$(VCTargetsPath)\BuildCustomizations\]] "${cuda_tools}" [[.props" />]])
+        string(CONCAT id_Import_targets [[<Import Project="$(VCTargetsPath)\BuildCustomizations\]] "${cuda_tools}" [[.targets" />]])
+      endif()
       if(CMAKE_VS_PLATFORM_NAME STREQUAL x64)
         set(id_ItemDefinitionGroup_entry "<CudaCompile><TargetMachinePlatform>64</TargetMachinePlatform></CudaCompile>")
       endif()

Modules/CompilerId/VS-10.vcxproj.in

@@ -14,6 +14,7 @@
     @id_system_version@
     @id_WindowsTargetPlatformVersion@
     @id_WindowsSDKDesktopARMSupport@
+    @id_CudaToolkitCustomDir@
   </PropertyGroup>
   @id_toolset_version_props@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />