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[Bug c/70297] [5/6 Regression] GCC Segfaults when using -g3
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 21 Mar 2016 11:11:09 +0000
- Subject: [Bug c/70297] [5/6 Regression] GCC Segfaults when using -g3
- Auto-submitted: auto-generated
- References: <bug-70297-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70297
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|debug |c
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
So duplicate_decls ggc_free()s newdecl which is still used as TYPE_NAME.
#1 0x000000000075a2fe in duplicate_decls (
newdecl=<type_decl 0x7ffff68abda8 target_ulong>,
olddecl=<type_decl 0x7ffff68abd10 target_ulong>)
at /space/rguenther/src/svn/trunk3/gcc/c/c-decl.c:2731
2731 ggc_free (newdecl);
(gdb) p olddecl->typed.type
$13 = <integer_type 0x7ffff698b540 target_ulong>
(gdb) p olddecl->typed.type->type_common.name
$14 = <type_decl 0x7ffff68abda8 target_ulong>
(gdb) p newdecl
$15 = <type_decl 0x7ffff68abda8 target_ulong>
C frontend issue. merge_decls copies everything from new to old, including
type which can self-reference new.