Merge topic 'llvm-rc-depfile' into release-3.17

2c724c3aea llvm-rc: Write depfile to location specified by the generator
4cc876540e llvm-rc: Select preprocessor from active languages

Acked-by: Kitware Robot <[email protected]>
Merge-request: !4524

Modules/Platform/Windows-Clang.cmake

@@ -135,13 +135,14 @@ if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC"
 
     # Feed the preprocessed rc file to llvm-rc
     if(CMAKE_RC_COMPILER_INIT STREQUAL "llvm-rc")
-      if(DEFINED CMAKE_C_COMPILER)
+      if(DEFINED CMAKE_C_COMPILER_ID)
         set(CMAKE_RC_PREPROCESSOR CMAKE_C_COMPILER)
-      elseif(DEFINED CMAKE_CXX_COMPILER)
+      elseif(DEFINED CMAKE_CXX_COMPILER_ID)
         set(CMAKE_RC_PREPROCESSOR CMAKE_CXX_COMPILER)
       endif()
       if(DEFINED CMAKE_RC_PREPROCESSOR)
-        set(CMAKE_RC_COMPILE_OBJECT "${CMAKE_COMMAND} -E cmake_llvm_rc <OBJECT>.pp <${CMAKE_RC_PREPROCESSOR}> <DEFINES> -DRC_INVOKED <INCLUDES> <FLAGS> -clang:-MD -clang:-MF -clang:<SOURCE>.d -E <SOURCE> -- <CMAKE_RC_COMPILER> <DEFINES> /fo <OBJECT> <OBJECT>.pp")
+        set(CMAKE_DEPFILE_FLAGS_RC "-clang:-MD -clang:-MF -clang:<DEPFILE>")
+        set(CMAKE_RC_COMPILE_OBJECT "${CMAKE_COMMAND} -E cmake_llvm_rc <OBJECT>.pp <${CMAKE_RC_PREPROCESSOR}> <DEFINES> -DRC_INVOKED <INCLUDES> <FLAGS> -E <SOURCE> -- <CMAKE_RC_COMPILER> <DEFINES> /fo <OBJECT> <OBJECT>.pp")
         if(CMAKE_GENERATOR STREQUAL "Ninja")
           set(CMAKE_NINJA_CMCLDEPS_RC 0)
           set(CMAKE_NINJA_DEP_TYPE_RC gcc)