From mboxrd@z Thu Jan 1 00:00:00 1970
Return-Path:
Received: (qmail 108842 invoked by alias); 6 Oct 2015 10:54:06 -0000
Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id:
List-Archive:
List-Post:
List-Help:
Sender: gcc-patches-owner@gcc.gnu.org
Received: (qmail 108223 invoked by uid 89); 6 Oct 2015 10:54:05 -0000
Authentication-Results: sourceware.org; auth=none
X-Virus-Found: No
X-Spam-SWARE-Status: No, score=-1.8 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS,T_RP_MATCHES_RCVD autolearn=ham version=3.3.2
X-HELO: mx1.redhat.com
Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Tue, 06 Oct 2015 10:54:04 +0000
Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 315D4A10A6; Tue, 6 Oct 2015 10:54:03 +0000 (UTC)
Received: from localhost (ovpn-116-138.ams2.redhat.com [10.36.116.138]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t96As2j0016237; Tue, 6 Oct 2015 06:54:02 -0400
Date: Tue, 06 Oct 2015 10:54:00 -0000
From: Jonathan Wakely
To: gcc-patches@gcc.gnu.org
Cc: Gerald Pfeifer , Joseph Myers , Sandra Loosemore
Subject: [wwwdocs] Suggest UBsan in https://gcc.gnu.org/bugs/
Message-ID: <20151006105401.GP12094@redhat.com>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="nM4qzG6nHdnn/sXd"
Content-Disposition: inline
X-Clacks-Overhead: GNU Terry Pratchett
User-Agent: Mutt/1.5.23 (2014-03-12)
X-SW-Source: 2015-10/txt/msg00523.txt.bz2
--nM4qzG6nHdnn/sXd
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Disposition: inline
Content-length: 213
For many non-bugs UBsan is at least as likely to reveal it as
-fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations so we
should tell people to try that before wasting time in Bugzilla.
OK for wwwdocs?
--nM4qzG6nHdnn/sXd
Content-Type: text/x-patch; charset=us-ascii
Content-Disposition: attachment; filename="patch.txt"
Content-length: 873
Index: htdocs/bugs/index.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/bugs/index.html,v
retrieving revision 1.116
diff -u -r1.116 index.html
--- htdocs/bugs/index.html 5 Jul 2014 21:52:32 -0000 1.116
+++ htdocs/bugs/index.html 6 Oct 2015 10:50:32 -0000
@@ -50,7 +50,11 @@
with gcc -Wall -Wextra
and see whether this shows anything
wrong with your code. Similarly, if compiling with
-fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations
-makes a difference, your code probably is not correct.
+makes a difference, your code probably is not correct.
+If compiling with -fsanitize=undefined
is supported by your
+version of GCC and produces any run-time errors your code is definitely
+not correct.
+
Summarized bug reporting instructions
--nM4qzG6nHdnn/sXd--