From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-458694-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 28027 invoked by alias); 18 Aug 2014 12:53:54 -0000
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
Received: (qmail 28005 invoked by uid 48); 18 Aug 2014 12:53:47 -0000
From: "terra at gnome dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/62169] New: map iterators under _GLIBCXX_DEBUG diverge
Date: Mon, 18 Aug 2014 12:53:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 4.8.1
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: terra at gnome dot org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-62169-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2014-08/txt/msg01191.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62169

            Bug ID: 62169
           Summary: map iterators under _GLIBCXX_DEBUG diverge
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: terra at gnome dot org

The two types
    std::map<int,int>::iterator
    std::map<const int,int>::iterator
are the same when compiled normally, but different under _GLIBCXX_DEBUG.

I actually don't know if the standard allows that, but if it does and the
difference is intentional, then the documentation ought to mention it.




welinder@sherwood:~> cat iterator.C
#include <iostream>
#include <map>

static int foo (const void *) { return 0; }
static int foo (std::map<int,int>::iterator *) { return 1; }

int
main ()
{
  std::cerr << foo (static_cast<std::map<const int,int>::iterator *> (0)) <<
std::endl;
  return 0;
}

welinder@sherwood:~> g++ iterator.C
welinder@sherwood:~> ./a.out 
1

welinder@sherwood:~> g++ -D_GLIBCXX_DEBUG iterator.C
welinder@sherwood:~> ./a.out 
0


welinder@sherwood:~> g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib64/gcc/x86_64-suse-linux/4.8/lto-wrapper
Target: x86_64-suse-linux
Configured with: ../configure --prefix=/usr --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64
--enable-languages=c,c++,objc,fortran,obj-c++,java,ada
--enable-checking=release --with-gxx-include-dir=/usr/include/c++/4.8
--enable-ssp --disable-libssp --disable-plugin
--with-bugurl=http://bugs.opensuse.org/ --with-pkgversion='SUSE Linux'
--disable-libgcj --disable-libmudflap --with-slibdir=/lib64 --with-system-zlib
--enable-__cxa_atexit --enable-libstdcxx-allocator=new --disable-libstdcxx-pch
--enable-version-specific-runtime-libs --enable-linker-build-id
--program-suffix=-4.8 --enable-linux-futex --without-system-libunwind
--with-arch-32=i586 --with-tune=generic --build=x86_64-suse-linux
Thread model: posix
gcc version 4.8.1 20130909 [gcc-4_8-branch revision 202388] (SUSE Linux) 


(Preprocessed versions coming up, just in case.)