[Bug default/27598] New: abidiff mishandles union member functions

["gprocida+abigail at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27598

            Bug ID: 27598
           Summary: abidiff mishandles union member functions
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: gprocida+abigail at google dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

I was originally investigating "harmless union" changes when I managed to crash
abidiff when adding member functions to unions.

SEGV #1

$ head ?.cc
==> 1.cc <==
union S {
  void bar() const { }
  int needed;
};
void fun(S s) { s.bar(); }

==> 2.cc <==
union S {
  void bar() const { }
};
void fun(S s) { s.bar(); }
$ for x in ?.cc; do g++ -Wall -Wextra -g -c $x; done
$ abidiff ?.o
Functions changes summary: 0 Removed, 2 Changed, 0 Added functions
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable

2 functions with some indirect sub-type change:

  [C] 'method void S::bar() const' at 2.cc:2:1 has some indirect sub-type
changes:
Segmentation fault

SEGV #2

$ head ?.cc
==> 1.cc <==
union S {
  void bar() const { }
  int needed;
};
void fun(S s) { s.bar(); }

==> 2.cc <==
struct S {
  void bar() const { }
};
void fun(S s) { s.bar(); }
$ for x in ?.cc; do g++ -Wall -Wextra -g -c $x; done
$ abidiff ?.o
Functions changes summary: 0 Removed, 2 Changed, 0 Added functions
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable

2 functions with some indirect sub-type change:

  [C] 'method void S::bar() const' at 2.cc:2:1 has some indirect sub-type
changes:
Segmentation fault

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