Re: MPS symbols

[Helmut Eller]

On Fri, Jun 28 2024, Gerd Möllmann wrote:

> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>
>> Forgot something. While looking at the scanner, I wondered if we could
>> remove the is_mps check from fix_lisp_obj now that we have the dump
>> in MPS...
>
> Let's find out, pushed. Works for me :-)

I think this uncovered a bug.  Now this

  emacs -Q -eval '(progn (view-hello-file) (forward-line 7) (dotimes (_ 5)
  (redisplay) (igc--collect) (forward-line)))' -f kill-emacs

causes a SIGSEGV in fix_font,

      case FONT_OBJECT_MAX:
        {
          struct font *f = (struct font *)v;
          const Lisp_Object *type = &f->driver->type;
          IGC_FIX12_OBJ (ss, igc_const_cast (Lisp_Object *, type));
        }

It turns out that f->driver is the variable xfont_driver and it is
actually const and the type field is a builtin symbol.  So it looks like
we can remove fix_font completely.