[Bug debug/107058] [11/12/13 Regression] ICE in dwarf2out_die_ref_for_decl, at dwarf2out.cc:6038 since r11-5003-gd50310408f54e380

["rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107058

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|ipa                         |debug
                 CC|                            |rguenth at gcc dot gnu.org

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
#1  0x0000000001223942 in dwarf2out_die_ref_for_decl (decl=
    <const_decl 0x7ffff669a000 A>, sym=0x7fffffffd170, off=0x7fffffffd168)
    at /home/rguenther/src/trunk/gcc/dwarf2out.cc:6037
6037      gcc_assert (die->die_tag == DW_TAG_compile_unit
(gdb) l
6032      *off = die->die_offset;
6033      while (die->die_parent)
6034        die = die->die_parent;
6035      /* For the containing CU DIE we compute a die_symbol in
6036         compute_comp_unit_symbol.  */
6037      gcc_assert (die->die_tag == DW_TAG_compile_unit
6038                  && die->die_id.die_symbol != NULL);
6039      *sym = die->die_id.die_symbol;
6040      return true;
6041    }
(gdb) p die->die_tag
$1 = DW_TAG_type_unit
(gdb) p die->die_id.die_symbol
$2 = 0x0

I think -fdebug-types-section isn't handled by early LTO debug I also think
we have a duplicate about this.

It might also be time to get rid of -fdebug-tyes-section?  Nobody uses it.

But I'm also not sure why the DIE for a CONST_DECL is inside a type unit?

(gdb) p debug_tree (expr)
 <const_decl 0x7ffff669a000 A
    type <enumeral_type 0x7ffff6685738 ._anon_0
        type <integer_type 0x7ffff66857e0 unsigned int public unsigned SI
            size <integer_cst 0x7ffff653d1c8 constant 32>
            unit-size <integer_cst 0x7ffff653d1e0 constant 4>
            align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff66857e0 precision:8 min <integer_cst 0x7ffff6693a68 0> max <integer_cst
0x7ffff6661ea0 255>>
        asm_written unsigned type_6 SI size <integer_cst 0x7ffff653d1c8 32>
unit-size <integer_cst 0x7ffff653d1e0 4>
        align:32 warn_if_not_align:0 symtab:-162242480 alias-set -1
canonical-type 0x7ffff6685738 precision:32 min <integer_cst 0x7ffff653d1f8 0>
max <integer_cst 0x7ffff653d1b0 4294967295> context <translation_unit_decl
0x7ffff6525168 pr50459.c>>
    readonly constant used VOID pr50459.c:6:8
    align:1 warn_if_not_align:0 context <translation_unit_decl 0x7ffff6525168
pr50459.c> initial <integer_cst 0x7ffff6693ab0 128> chain <type_decl
0x7ffff654abe0 ._anon_0>>