[Bug debug/51650] [4.7 regression] LTO ICE in dwarf2out_finish, at dwarf2out.c:22501 while building libxul

["markus at trippelsdorf dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51650

--- Comment #20 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2011-12-23 13:56:55 UTC ---
(In reply to comment #19)
> A workaround for ICEs of this form is
> 
> Index: gcc/dwarf2out.c
> ===================================================================
> --- gcc/dwarf2out.c     (revision 182652)
> +++ gcc/dwarf2out.c     (working copy)
> @@ -22496,15 +22496,23 @@ dwarf2out_finish (const char *filename)
>               else if (TYPE_P (node->created_for))
>                 context = TYPE_CONTEXT (node->created_for);
> 
> -             gcc_assert (context
> -                         && (TREE_CODE (context) == FUNCTION_DECL
> -                             || TREE_CODE (context) == NAMESPACE_DECL));
> +             if (!(context
> +                   && (TREE_CODE (context) == FUNCTION_DECL
> +                       || TREE_CODE (context) == NAMESPACE_DECL)))
> +               {
> +                 if (!in_lto_p)
> +                   gcc_unreachable ();
> 
> -             origin = lookup_decl_die (context);
> -             if (origin)
> -               add_child_die (origin, die);
> +                 add_child_die (comp_unit_die (), die);
> +               }
>               else
> -               add_child_die (comp_unit_die (), die);
> +               {
> +                 origin = lookup_decl_die (context);
> +                 if (origin)
> +                   add_child_die (origin, die);
> +                 else
> +                   add_child_die (comp_unit_die (), die);
> +               }
>             }
>         }
>      }
> 
> just in case you want to look further ;)

Fortunately it seems that this bug was the last issue that needed to be fixed.
Firefox now builds fine with -lto and -g.