From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS22989 209.51.188.0/24 X-Spam-Status: No, score=-3.8 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_PASS, SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 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 F05941F5AE for ; Tue, 27 Apr 2021 06:50:36 +0000 (UTC) Received: from localhost ([::1]:35524 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lbHYJ-0002Pt-QC for normalperson@yhbt.net; Tue, 27 Apr 2021 02:50:35 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47652) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lbHYG-0002Pi-T6 for bug-gnulib@gnu.org; Tue, 27 Apr 2021 02:50:32 -0400 Received: from zimbra.cs.ucla.edu ([131.179.128.68]:51652) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lbHYE-0000gR-LE for bug-gnulib@gnu.org; Tue, 27 Apr 2021 02:50:32 -0400 Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 3841B160152; Mon, 26 Apr 2021 23:50:28 -0700 (PDT) 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 1tL1xzqxvS3y; Mon, 26 Apr 2021 23:50:27 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 6229916015B; Mon, 26 Apr 2021 23:50:27 -0700 (PDT) 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 04JhzXxVOzCH; Mon, 26 Apr 2021 23:50:27 -0700 (PDT) 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 3A64D160152; Mon, 26 Apr 2021 23:50:27 -0700 (PDT) Subject: Re: Undefined use of weak symbols in gnulib To: Florian Weimer References: <87o8e0p92r.fsf@oldenburg.str.redhat.com> From: Paul Eggert Organization: UCLA Computer Science Department Message-ID: Date: Mon, 26 Apr 2021 23:50:26 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <87o8e0p92r.fsf@oldenburg.str.redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US 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: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, NICE_REPLY_A=-0.001, 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: 2.1.23 Precedence: list List-Id: Gnulib discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bug-gnulib@gnu.org, libc-alpha@sourceware.org, binutils@sourceware.org Errors-To: bug-gnulib-bounces+normalperson=yhbt.net@gnu.org Sender: "bug-gnulib" On 4/26/21 10:53 PM, Florian Weimer via Libc-alpha wrote: > This will become an urgent issue with glibc 2.34, which defines > pthread_mutexattr_gettype unconditionally. Certain gnulib modules will > stop working until the binaries are relinked. Thanks for mentioning this. But in what sense will the modules stop working? I'm a little lost. glibc 2.34 also defines pthread_once unconditionally, right? So why doesn't code like this: if (pthread_mutexattr_gettype != NULL) pthread_once (control, callback); continue to work in 2.34?