[Bug c/93718] New: Use a single translation message template for structurally equal messages

[roland.illig at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93718

            Bug ID: 93718
           Summary: Use a single translation message template for
                    structurally equal messages
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roland.illig at gmx dot de
  Target Milestone: ---

In cp/parser.c, function cp_parser_required_error, there are more than 20
messages that are essentially the same.

      case RT_EXTERN:
        gmsgid = G_("expected %<extern%>");
        break;

Instead of G_("expected %<extern%>"), the call should be:

      case RT_EXTERN:
        gmsgid = G_("expected %q");
        gparam = "extern";
        break;

This has the benefit that the translators don't have to translate each of these
messages individually, and it completely removes any chance of copy-and-paste
mistakes on the translator's side. In the current situation, I as a translator
could accidentally translate "expected %<extern%>" with "expected %<inline%>",
and this mistake would only be caught by manual human inspection.