From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-401004-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 17100 invoked by alias); 15 Sep 2012 14:08:59 -0000
Received: (qmail 17090 invoked by uid 22791); 15 Sep 2012 14:08:58 -0000
X-SWARE-Spam-Status: No, hits=-3.6 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; Sat, 15 Sep 2012 14:08:44 +0000
From: "wingfire at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/54590] New: Incorrect multi-inheritence bases layout
Date: Sat, 15 Sep 2012 14:08:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: major
X-Bugzilla-Who: wingfire at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-54590-4@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: 2012-09/txt/msg01170.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54590

             Bug #: 54590
           Summary: Incorrect multi-inheritence bases layout
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: wingfire@gmail.com


the code:

#include <iostream>

struct A{ virtual void foo() {} };                                              

struct B { void * data; };

struct X : public B, A { };

int main(){

    X x;
    if((void*)&x == (void*)(&x.data))
        std::cout << "correct\n";
    else
        std::cout << "oops...\n";
    return 0;
}

Expect:
print "correct"

Result:
print "oops..."

Notes:
if A::foo is not virtual, the result is correct.