From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-374063-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 512 invoked by alias); 15 Nov 2011 19:45:04 -0000
Received: (qmail 449 invoked by uid 22791); 15 Nov 2011 19:45:03 -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; Tue, 15 Nov 2011 19:44:06 +0000
From: "alpha_lc at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51146] New: The name clog for a global variable triggers a segfault inside std::pow
Date: Tue, 15 Nov 2011 19:53:00 -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: alpha_lc at hotmail 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-51146-4@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: 2011-11/txt/msg01559.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51146

             Bug #: 51146
           Summary: The name clog for a global variable triggers a
                    segfault inside std::pow
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: alpha_lc@hotmail.com


Adding a global variable to the code with a name like clog, while using
std::pow on a std::complex<double> triggers a segfault when std::pow is
reached. A simple example ( http://codepad.org/4Ekpgj91 ):

#include <iostream>
#include <complex>
#include <cmath>

int clog=0;

int main()
{
    std::cout<<"test1"<<std::endl;
    std::complex<double> b(1,-1);
    std::cout<<"test "<<std::pow(b,2.0)<<std::endl;
    std::cout<<"test2"<<std::endl;
}

This behavior has first been noticed on MinGW with gcc 4.5.2, but as soon as I
found out where the bug came from it was checked on codepad, and from various
gcc users in irc.freenode.net . I rate this bug as major because there might be
something deeper behind it.