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: AS17314 8.43.84.0/22 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,SPF_HELO_PASS,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPS id 2EAE41F5AE for ; Tue, 27 Apr 2021 06:50:32 +0000 (UTC) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 68C6C3833033; Tue, 27 Apr 2021 06:50:31 +0000 (GMT) Received: from zimbra.cs.ucla.edu (zimbra.cs.ucla.edu [131.179.128.68]) by sourceware.org (Postfix) with ESMTPS id 03F3F3858024; Tue, 27 Apr 2021 06:50:28 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 03F3F3858024 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=cs.ucla.edu Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=eggert@cs.ucla.edu 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 X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing 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: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" 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?