Merge topic 'msvc-use-utf8'

55118abd Use /utf-8 option when compiling with MSVC

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !10194

CMake/vtkCompilerPlatformFlags.cmake

@@ -135,6 +135,12 @@ if(MSVC)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /bigobj")
 endif()
 
+# Use /utf-8 so that MSVC uses utf-8 in source files and object files
+if(MSVC)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /utf-8")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /utf-8")
+endif()
+
 #-----------------------------------------------------------------------------
 # Add compiler flags VTK needs to work on this platform.  This must be
 # done after the call to CMAKE_EXPORT_BUILD_SETTINGS, but before any

Documentation/release/dev/msvc-utf8-option.md

+## Apply utf-8 option to MSVC builds
+
+When building with Visual C++, use the /utf-8 option to force
+source code to be read as utf-8 instead of defaulting to the
+system code page specified by the locale settings.