[Bug c++/78572] [6/7 Regression] internal compiler error: in output_constructor_regular_field, at varasm.c:4968

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78572

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-11-29
                 CC|                            |msebor at gcc dot gnu.org
            Summary|internal compiler error: in |[6/7 Regression] internal
                   |output_constructor_regular_ |compiler error: in
                   |field, at varasm.c:4968     |output_constructor_regular_
                   |                            |field, at varasm.c:4968
     Ever confirmed|0                           |1
      Known to fail|                            |6.2.0, 7.0

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  Bisection points to r234636 as the change that caused it.  Looks
like it's a 6/7 regression, though designated initializers don't fully work in
G++.

(gcc 6.0.0) failed (status 4):
------------------------------------------------------------------------
r234636 | nathan | 2016-03-31 11:30:33 -0400 (Thu, 31 Mar 2016) | 11 lines

        PR c++/70393
        * varasm.c (output_constructor_regular_field): Flush bitfield
        earlier.  Assert we don't want to move backwards.

        cp/
        * constexpr.c (cxx_eval_store_expression): Keep CONSTRUCTOR
        elements in field order.

        testsuite/
        * g++.dg/cpp0x/constexpr-virtual6.C: New.


The full stack trace is below:

t.C:7:1: internal compiler error: in output_constructor_regular_field, at
varasm.c:4989
 }
 ^
0x148b5bf output_constructor_regular_field
        ../../gcc/varasm.c:4989
0x148c3a5 output_constructor
        ../../gcc/varasm.c:5297
0x148aaf4 output_constant
        ../../gcc/varasm.c:4794
0x1482165 assemble_variable_contents
        ../../gcc/varasm.c:2083
0x1482bbf assemble_variable(tree_node*, int, int, int)
        ../../gcc/varasm.c:2259
0x149a0bc varpool_node::assemble_decl()
        ../../gcc/varpool.c:588
0xbab20d output_in_order
        ../../gcc/cgraphunit.c:2248
0xbab8d2 symbol_table::compile()
        ../../gcc/cgraphunit.c:2488
0xbabb1b symbol_table::finalize_compilation_unit()
        ../../gcc/cgraphunit.c:2584
Please submit a full bug report,