https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108553
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #3)
> I'm trying to reproduce this - in the meantime does the obvious fix solve
> the problem for you?
>
> diff --cc gcc/m2/gm2-lang.cc
> index 4d9cae205a7,4d9cae205a7..a30e626620c
> --- a/gcc/m2/gm2-lang.cc
> +++ b/gcc/m2/gm2-lang.cc
> @@@ -290,12 -290,12 +290,9 @@@ gm2_langhook_init_options (unsigned in
> M2Options_SetVerbose (value);
> /* FALLTHROUGH */
> default:
> ++ /* We handled input files above. */
> if (code >= N_OPTS)
> -- {
> -- // FIXME remove debug.
> -- fprintf(stderr, "%s : %s\n", opt, (arg ? arg : ""));
> -- break;
> -- }
> ++ break;
> /* Do not pass Modula-2 args to the preprocessor, any that we care
> about here should already have been handled above. */
> if (option->flags & CL_ModulaX2)
Yes, that fixes the ICE and produces
cc1gm2: error: unrecognized command-line option '-Wereturn-type'
btw, the 'opt' variable is unused after the removal
