From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from zimbra.cs.ucla.edu (zimbra.cs.ucla.edu [131.179.128.68]) by sourceware.org (Postfix) with ESMTPS id 0143D3887F4A for ; Sat, 12 Nov 2022 21:31:06 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 0143D3887F4A Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=cs.ucla.edu Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=cs.ucla.edu Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 4F703160072; Sat, 12 Nov 2022 13:31:06 -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 6BD842lg2IhN; Sat, 12 Nov 2022 13:31:05 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 3F1CA160079; Sat, 12 Nov 2022 13:31:05 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.9.2 zimbra.cs.ucla.edu 3F1CA160079 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=78364E5A-2AF3-11ED-87FA-8298ECA2D365; t=1668288665; bh=dvX32ikVwcxqcTy6wq5yvQGzEPgv6LxppVXtMIOfitc=; h=Message-ID:Date:MIME-Version:To:From:Subject:Content-Type: Content-Transfer-Encoding; b=TgjUgzqhnGlNYrXBmzXukw/deA9AtdsATQA8jMXJc4Tlk1ShZ0IXSpEaWprAwn5Gf p5WSbPuess/2ICUCrq8+Xd2ffiy58UVzz/d/bu2Kxuzhy1gDWi7H+dqz3W7OHYHP82 OTLzLjBGdC57OemUSBLtZ1SviSCR7aDDZNWuSYao= 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 shXdHUkFFUMe; Sat, 12 Nov 2022 13:31:05 -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 B951F160072; Sat, 12 Nov 2022 13:31:04 -0800 (PST) Message-ID: Date: Sat, 12 Nov 2022 13:31:04 -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: Wookey Cc: Bruno Haible , Zack Weinberg , Sam James , Florian Weimer , Carlos O'Donell via Libc-alpha , autoconf@gnu.org, c-std-porting@lists.linux.dev, toolchain@gentoo.org, bug-gnulib@gnu.org, Arnd Bergmann References: <6953747.nAD6y4vbrC@nimes> <20221112202321.GO27919@mail.wookware.org> From: Paul Eggert Organization: UCLA Computer Science Department Subject: Re: On time64 and Large File Support In-Reply-To: <20221112202321.GO27919@mail.wookware.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,JMQ_SPF_NEUTRAL,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 2022-11-12 12:23, Wookey wrote: > we can't just have everyone who enabled LFS sometime in the > last 20 years suddenly being forced into the time_t change (can we?) We've done it in the past. AC_SYS_LARGEFILE originally was in Gnulib, before it migrated to Autoconf. Originally it affected only off_t; its effect on other types like ino_t came later. Hence people who initially used AC_SYS_LARGEFILE were later "suddenly forced" into an ino_t width change. Similarly for other non-off_t types that AC_SYS_LARGEFILE affects. So there's longstanding precedent for AC_SYS_LARGEFILE changing the width of system types that were formerly unaffected. The difference is that time_t is more widely used than ino_t etc., and people are understandably more concerned about time_t changes. Because of the concerns raised in this thread it's become clear that what's in Autoconf now is too drastic, and I've proposed (though not yet implemented) a change that will cause AC_SYS_LARGEFILE to continue to not affect time_t unless there's an affirmative request like "./configure --enable-year2038". I am waiting for feedback on that from Zack and others, and am hoping for quick turnaround on this because we do need a new Autoconf release.