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[Bug lto/86412] lto1: internal compiler error: in lto_symtab_prevailing_virtual_decl, at lto/lto-symtab.c


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86412

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-checking
             Target|                            |x86_64-pc-linux-gnu
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-07-05
                 CC|                            |hubicka at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |6.4.1, 7.3.1, 8.1.1, 9.0

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed everywhere with the reduced testcase (the pasted one misses a line).

We run into

tree
lto_symtab_prevailing_virtual_decl (tree decl)
{
...
  gcc_checking_assert (!type_in_anonymous_namespace_p (DECL_CONTEXT (decl))
                       && DECL_ASSEMBLER_NAME_SET_P (decl));

where type_in_anonymous_namespace_p (DECL_CONTEXT (decl)) is true.

TYPE_STUB_DECL is

 <type_decl 0x7ffff6a822f8 e
    type <record_type 0x7ffff6a84348 e addressable needs-constructing BLK
        size <integer_cst 0x7ffff688dbe8 constant 64>
        unit-size <integer_cst 0x7ffff688dc00 constant 8>
        align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff6a84348
        fields <field_decl 0x7ffff6a82260 D.4260 type <record_type
0x7ffff6a842a0 c>
            ignored BLK t.C:6:27 size <integer_cst 0x7ffff688dbe8 64> unit-size
<integer_cst 0x7ffff688dc00 8>
            align:64 warn_if_not_align:0 offset_align 128
            offset <integer_cst 0x7ffff688dc18 constant 0>
            bit-offset <integer_cst 0x7ffff688dc60 constant 0> context
<record_type 0x7ffff6a84348 e>> context <translation_unit_decl 0x7ffff6897168
t.C>
        pointer_to_this <pointer_type 0x7ffff6a843f0> chain <type_decl
0x7ffff6a822f8 e>>
    BLK t.C:6:27
    align:8 warn_if_not_align:0 context <translation_unit_decl 0x7ffff6897168
t.C>>

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