From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-380877-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 2740 invoked by alias); 22 Jan 2012 21:42:55 -0000
Received: (qmail 2729 invoked by uid 22791); 22 Jan 2012 21:42:54 -0000
X-SWARE-Spam-Status: No, hits=-2.9 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sun, 22 Jan 2012 21:42:41 +0000
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51812] [4.7 regression] Virtual public inheritance and thunks leads to "undefined reference" in header files.
Date: Sun, 22 Jan 2012 22:10:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: major
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.7.0
X-Bugzilla-Changed-Fields: Target CC Host Summary Build
Message-ID: <bug-51812-4-pwueU5HHXZ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-51812-4@http.gcc.gnu.org/bugzilla/>
References: <bug-51812-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-01/txt/msg02552.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51812

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|x86_64-linux-gnu            |
                 CC|                            |hubicka at gcc dot gnu.org
               Host|x86_64-linux-gnu            |
            Summary|[4.7 regression] Virtual    |[4.7 regression] Virtual
                   |public inheritance leads to |public inheritance and
                   |"undefined reference" in    |thunks leads to "undefined
                   |header files.               |reference" in header files.
              Build|x86_64-linux-gnu            |

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-01-22 21:42:38 UTC ---
Reduced testcase:
class Object {
  virtual Object* clone() const =0;
  virtual char* print() const;
};
class alphabet: virtual public Object{};
class Nucleotides: public alphabet {};
class DNA: public Nucleotides {
  virtual DNA* clone() const {return new DNA(*this);}
};
int main() { }
--- CUT ---
This testcase requires thunks and virtual inheritance.