From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-391322-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 18760 invoked by alias); 8 May 2012 22:22:38 -0000
Received: (qmail 18751 invoked by uid 22791); 8 May 2012 22:22:38 -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; Tue, 08 May 2012 22:22:26 +0000
From: "doko at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/53285] New: libibiberty's md5.c builds with warnings with 4.7 and trunk
Date: Tue, 08 May 2012 22:31:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: other
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: doko at gcc dot gnu.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-Changed-Fields:
Message-ID: <bug-53285-4@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: 2012-05/txt/msg00940.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53285

             Bug #: 53285
           Summary: libibiberty's md5.c builds with warnings with 4.7 and
                    trunk
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: doko@gcc.gnu.org


when libibiberty's md5.c is built using 4.7 or trunk on x86-linux, the
following warning is emitted:

md5.c: In function 'md5_finish_ctx':
md5.c:119:2: error: dereferencing type-punned pointer will break
strict-aliasing rules [-Werror=strict-aliasing]
  *(md5_uint32 *) & ctx->buffer[bytes + pad] = SWAP (ctx->total[0] << 3);
  ^
md5.c:120:2: error: dereferencing type-punned pointer will break
strict-aliasing rules [-Werror=strict-aliasing]
  *(md5_uint32 *) & ctx->buffer[bytes + pad + 4] =
  ^

afaics this is the only warning emitted when building libiberty when built with
4.7 or trunk.