From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS22989 209.51.188.0/24 X-Spam-Status: No, score=-4.2 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H2, SPF_HELO_PASS,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.6 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPS id 558BE1F5A0 for ; Sat, 4 Feb 2023 22:04:13 +0000 (UTC) Authentication-Results: dcvr.yhbt.net; dkim=pass (1024-bit key; unprotected) header.d=cs.ucla.edu header.i=@cs.ucla.edu header.a=rsa-sha256 header.s=78364E5A-2AF3-11ED-87FA-8298ECA2D365 header.b=oFon4LF5; dkim-atps=neutral Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pOQdc-000162-JE; Sat, 04 Feb 2023 17:04:00 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pOQda-00015t-Qc for bug-gnulib@gnu.org; Sat, 04 Feb 2023 17:03:58 -0500 Received: from zimbra.cs.ucla.edu ([131.179.128.68]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pOQdY-0004hp-VR for bug-gnulib@gnu.org; Sat, 04 Feb 2023 17:03:58 -0500 Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 2DFF916005E; Sat, 4 Feb 2023 14:03:55 -0800 (PST) Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id BmkR1Hy18fhQ; Sat, 4 Feb 2023 14:03:54 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 52C68160093; Sat, 4 Feb 2023 14:03:54 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.9.2 zimbra.cs.ucla.edu 52C68160093 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=78364E5A-2AF3-11ED-87FA-8298ECA2D365; t=1675548234; bh=NCt8Tkax/A5q+YFb88Y6XpTN934UPox6Xh2f4N+L3Ts=; h=Message-ID:Date:MIME-Version:To:From:Subject:Content-Type: Content-Transfer-Encoding; b=oFon4LF5CUarH9U/qBiOB2ejtnXMxnLAvjBu3cPilmcEOy21x+B12ubWnAnM/qTKH WX5TWBUAtH3XL28LUYKcYWdXYGZDKbWBU2iGK10XKWxzzm6jgWQB9Dks0qZ4ixDNY1 tZwcXUVgqLInMN5mW/ukb1ROQLd2aSf44/ZTaRYg= X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id SLyGN9ebclan; Sat, 4 Feb 2023 14:03:54 -0800 (PST) Received: from [192.168.1.9] (cpe-172-91-119-151.socal.res.rr.com [172.91.119.151]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 2104516005E; Sat, 4 Feb 2023 14:03:54 -0800 (PST) Message-ID: <8e1c650a-cd3f-6f5d-ed0b-d0b7c3e55af0@cs.ucla.edu> Date: Sat, 4 Feb 2023 14:03:53 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 Content-Language: en-US To: Sam James Cc: Peter Frazier , bug-gnulib@gnu.org References: <7B6A1D32-7ECD-4DE0-9E0C-1955F9B756B5@gentoo.org> <7cc5a194-7cd8-e88e-c8fe-b7fa4df4af01@cs.ucla.edu> <456afa7c-fafc-dd20-af7e-8202aa24a6ad@cs.ucla.edu> <3CF19D45-F152-41AF-BFA9-0FB7A4B799DB@gentoo.org> From: Paul Eggert Organization: UCLA Computer Science Department Subject: Re: coreutils/gnulib - fts.c dangling pointers & gcc 13.1 In-Reply-To: <3CF19D45-F152-41AF-BFA9-0FB7A4B799DB@gentoo.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=131.179.128.68; envelope-from=eggert@cs.ucla.edu; helo=zimbra.cs.ucla.edu X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, NICE_REPLY_A=-0.09, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: bug-gnulib@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gnulib discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnulib-bounces+normalperson=yhbt.net@gnu.org Sender: bug-gnulib-bounces+normalperson=yhbt.net@gnu.org On 2023-02-04 12:23, Sam James wrote: > I guess it's hard for me to say given I don't know what options allowed it to be reproduced and I couldn't hit it. > > I assumed it must have been -Wstrict-aliasing=2 or lower which makes it more aggressive at the risk of false positives. > > But if you reproduced it, then it's useful, I suppose. I didn't reproduce the warning, since I lack GCC "13.1". I merely looked at the Gnulib source and noticed a couple of places where it was not conforming to the C standard. I have enough knowledge of GCC internals that I think I've changed the code so that it will pacify GCC "13.1". Although the updated code still doesn't conform, it should work fine on real platforms. (The old code probably works too, for what it's worth.)