https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71063

ktkachov at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
           Assignee|ktkachov at gcc dot gnu.org        |unassigned at gcc dot 
gnu.org

--- Comment #4 from ktkachov at gcc dot gnu.org ---
(In reply to Marek Polacek from comment #3)
> FWIW, my fix was
> 
> --- a/gcc/opts.c
> +++ b/gcc/opts.c
> @@ -1641,6 +1641,11 @@ common_handle_option (struct gcc_options *opts,
>           {
>         ++ a;
>         pflags = & exclude_flags;
> +       if (*a == '\0')
> +         {
> +           error_at (loc, "missing argument to %qs", "--help=^");
> +           break;
> +         }
>           }
>         else
>           pflags = & include_flags;


Ah, this looks a bit cleaner and shorter than what I had in mind.
Would you mind testing/submitting yours instead?

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