Clang: Use -fno-ansi-escape-codes for color diagnostics on Windows

-fno-ansi-escape-codes is used only on Windows by Clang.

Without the flag color diagnostics are displayed only if clang.exe
is executed directly. Build tools like ninja and mingw32-make
will not display colored diagnostics.

Using -fno-ansi-escape-codes will make the build tools pass
the colored diagnostics to the calling application e.g IDE.

Fixes: #24235

Modules/Compiler/Clang.cmake

@@ -117,8 +117,14 @@ else()
 
     # '-fcolor-diagnostics' introduced since Clang 2.6
     if(CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL 2.6)
-      set(CMAKE_${lang}_COMPILE_OPTIONS_COLOR_DIAGNOSTICS "-fcolor-diagnostics")
-      set(CMAKE_${lang}_COMPILE_OPTIONS_COLOR_DIAGNOSTICS_OFF "-fno-color-diagnostics")
+      # -fansi-escape-codes mentioned at https://releases.llvm.org/3.7.0/tools/clang/docs/UsersManual.html
+      if (CMAKE_HOST_WIN32 AND CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL 3.7)
+        set(CMAKE_${lang}_COMPILE_OPTIONS_COLOR_DIAGNOSTICS -fansi-escape-codes -fcolor-diagnostics)
+        set(CMAKE_${lang}_COMPILE_OPTIONS_COLOR_DIAGNOSTICS_OFF -fno-ansi-escape-codes  -fno-color-diagnostics)
+      else()
+        set(CMAKE_${lang}_COMPILE_OPTIONS_COLOR_DIAGNOSTICS -fcolor-diagnostics)
+        set(CMAKE_${lang}_COMPILE_OPTIONS_COLOR_DIAGNOSTICS_OFF -fno-color-diagnostics)
+      endif()
     endif()
   endmacro()
 endif()