From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: INT_ADD_OVERFLOW broken? Date: Sat, 21 Sep 2013 23:59:32 -0700 Organization: UCLA Computer Science Department Message-ID: <523E9554.20007@cs.ucla.edu> References: <523E3C3E.4080003@dancol.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1379833191 8991 80.91.229.3 (22 Sep 2013 06:59:51 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 22 Sep 2013 06:59:51 +0000 (UTC) To: Daniel Colascione , Emacs development discussions Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sun Sep 22 08:59:54 2013 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VNde5-0006E2-Rc for ged-emacs-devel@m.gmane.org; Sun, 22 Sep 2013 08:59:53 +0200 Original-Received: from localhost ([::1]:34149 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VNde5-00045a-Er for ged-emacs-devel@m.gmane.org; Sun, 22 Sep 2013 02:59:53 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:40218) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VNddv-00045F-3B for emacs-devel@gnu.org; Sun, 22 Sep 2013 02:59:50 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VNddn-0005qE-O0 for emacs-devel@gnu.org; Sun, 22 Sep 2013 02:59:43 -0400 Original-Received: from smtp.cs.ucla.edu ([131.179.128.62]:37822) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VNddn-0005q0-IA for emacs-devel@gnu.org; Sun, 22 Sep 2013 02:59:35 -0400 Original-Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id D3FE739E8100; Sat, 21 Sep 2013 23:59:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Original-Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kULGEgc1-JJz; Sat, 21 Sep 2013 23:59:33 -0700 (PDT) Original-Received: from [192.168.1.9] (pool-108-0-233-62.lsanca.fios.verizon.net [108.0.233.62]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 79D2339E80F8; Sat, 21 Sep 2013 23:59:33 -0700 (PDT) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 In-Reply-To: <523E3C3E.4080003@dancol.org> X-Enigmail-Version: 1.5.2 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 131.179.128.62 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:163546 Archived-At: Daniel Colascione wrote: > Is INT_ADD_OVERFLOW actually safe? It's supposed to be, yes. As I recall, -Wstrict-overflow and -Wtype-limits issue many false alarms, for INT_ADD_OVERFLOW as well as for other things, so I don't recommend their use when building GNU Emacs. That's why --enable-gcc-warnings doesn't enable these options. It's possible that you've found a bug in INT_ADD_OVERFLOW; to check that it'd be helpful to have a self-contained example so that the problem can be reproduced and understood.