message: MSVC (Windows): use /experimental:preprocessor for better standards-conformance
diff: @@ -336,6 +336,11 @@ build:windows --host_copt=-DWIN32_LEAN_AND_MEAN
  build:windows --copt=-DNOGDI
  build:windows --host_copt=-DNOGDI
  +# MSVC (Windows): Standards-conformant preprocessor mode
  +# See https://docs.microsoft.com/en-us/cpp/preprocessor/preprocessor-experimental-overview
  +build:windows --copt=/experimental:preprocessor
  +build:windows --host_copt=/experimental:preprocessor
  +
  # Misc build options we need for windows.
  build:windows --linkopt=/DEBUG
  build:windows --host_linkopt=/DEBUG
  