[Bug lto/66103] New: [6 Regression] ICE verify_type failed

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66103

            Bug ID: 66103
           Summary: [6 Regression] ICE verify_type failed
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
  Target Milestone: ---

The following program used to compile awhile ago, but now it ICEs when compiled
with "g++ -flto -g". It works without "-g"


class ios_base {
  public:
    class Init {
    public:
      Init ();
    };
  };
  static ios_base::Init __ioinit;
class Foo {
  static const Foo m_var;
  static inline const Foo & getFoo () {
    return m_var;
  }
};


input17c.ii:14:2: error: type variant has different TYPE_FIELDS
...
input17c.ii:14:2: internal compiler error: verify_type failed
0xf2b36d verify_type(tree_node const*)
        ../../gcc/tree.c:12971
0x970e54 gen_type_die_with_usage
        ../../gcc/dwarf2out.c:20247
0x96f47b gen_decl_die
        ../../gcc/dwarf2out.c:21007
0x9703ec dwarf2out_decl
        ../../gcc/dwarf2out.c:21394
0xcb962c emit_debug_global_declarations(tree_node**, int)
        ../../gcc/toplev.c:576
0x6d0c2d cp_write_global_declarations()
        ../../gcc/cp/decl2.c:4814