[Bug c/66068] New: error: type variant has different TYPE_VFIELD

["dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66068

            Bug ID: 66068
           Summary: error: type variant has different TYPE_VFIELD
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 35495
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35495&action=edit
C source code

The attached code, when compiled by gcc trunk dated 20150506
and with flag -g, says this:

udns_resolver.c: In function ‘dns_new’:
udns_resolver.c:474:1: error: type variant has different TYPE_VFIELD

...

udns_resolver.c:474:1: internal compiler error: verify_type failed
0xe3782b verify_type(tree_node const*)
    ../../src/trunk/gcc/tree.c:12695
0x7de490 gen_type_die_with_usage
    ../../src/trunk/gcc/dwarf2out.c:20247
0x7cede2 gen_type_die_with_usage
    ../../src/trunk/gcc/dwarf2out.c:20334
0x7cd756 gen_type_die
    ../../src/trunk/gcc/dwarf2out.c:20431
>From gcc-bugs-return-485826-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 08 07:45:49 2015
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/66066] [6 Regression] r222889 causes bogus error: initializer element is not constant
Date: Fri, 08 May 2015 07:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf066

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #1)
> Yes, that is expected (in C99!).  See
> <https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01946.html>.  New tests
> c90-left-shift-1.c and c99-left-shift-1.c explicitly test such behavior.

Hmm, that looks quite unfortunate from a qoi standpoint.
It will break tons of existing code.