Merge topic 'vs-clangcl' into release-3.17

f3d7a15010 VS: Fix ClangCL toolset compiler path detection

Acked-by: Kitware Robot <[email protected]>
Merge-request: !4523

Modules/CMakeDetermineCompilerId.cmake

@@ -246,8 +246,10 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
     set(id_platform ${CMAKE_VS_PLATFORM_NAME})
     set(id_lang "${lang}")
     set(id_PostBuildEvent_Command "")
-    if(CMAKE_VS_PLATFORM_TOOLSET MATCHES "^([Ll][Ll][Vv][Mm](_v[0-9]+(_xp)?)?|[Cc][Ll][Aa][Nn][Gg][Cc][Ll])$")
+    if(CMAKE_VS_PLATFORM_TOOLSET MATCHES "^[Ll][Ll][Vv][Mm](_v[0-9]+(_xp)?)?$")
       set(id_cl_var "ClangClExecutable")
+    elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "^[Cc][Ll][Aa][Nn][Gg][Cc][Ll]$")
+      set(id_cl "$(CLToolExe)")
     elseif(CMAKE_VS_PLATFORM_TOOLSET MATCHES "v[0-9]+_clang_.*")
       set(id_cl clang.exe)
     else()