From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mo4-p00-ob.smtp.rzone.de (mo4-p00-ob.smtp.rzone.de [81.169.146.217]) by sourceware.org (Postfix) with ESMTPS id 812523857C7E for ; Sat, 17 Jul 2021 16:39:40 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 812523857C7E Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=clisp.org Authentication-Results: sourceware.org; spf=none smtp.mailfrom=clisp.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1626539973; s=strato-dkim-0002; d=clisp.org; h=References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=1Ngg7WyuB/V+MW5fx/ZDIEVdXHd/vQDrsUJCGkIReGo=; b=oCqISWRW2A2Dy2GIlkmNRTQuebTcve7xXDwuIRP+z/fagrRs14DLpTsJdGbtDYwfoz uQisvbq5wVGtwcbBHv5mZbCIeW7GODQH4cpcFzJF+wflpEROvKr/c4tf+dq4spEg+auY YNTBx1jrhumxKeycHTrVq5aYj0R1DljcFRfl1w6V9pCJWz1FNKgC8B2bI7W/Vb+7LDQP NA8WeCSJnbSiDqEbvz1z+tMYK3EwWetYDZE2Hnb41HtfsLvyAcX+k25VuLLh0icB2Siu 43T08YbNbRMRPo+EqmKaxJTb/f4TsYjNuiE6aJAsGdGFoAMan7SjfFu5yNuUAbqoMoYa u5Ig== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":Ln4Re0+Ic/6oZXR1YgKryK8brlshOcZlIWs+iCP5vnk6shH/DXj0JGsbh0vbrMZq" X-RZG-CLASS-ID: mo00 Received: from bruno.haible.de by smtp.strato.de (RZmta 47.28.1 DYNA|AUTH) with ESMTPSA id u08ae3x6HGdWFNO (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (curve X9_62_prime256v1 with 256 ECDH bits, eq. 3072 bits RSA)) (Client did not present a certificate); Sat, 17 Jul 2021 18:39:32 +0200 (CEST) From: Bruno Haible To: Florian Weimer Cc: libc-alpha@sourceware.org, bug-gnulib@gnu.org Subject: Re: Undefined use of weak symbols in gnulib Date: Sat, 17 Jul 2021 18:39:32 +0200 Message-ID: <1690960.U8ZAqMrVH5@omega> User-Agent: KMail/5.1.3 (Linux/4.4.0-210-generic; KDE/5.18.0; x86_64; ; ) In-Reply-To: <87a6mlyopt.fsf@oldenburg.str.redhat.com> References: <87o8e0p92r.fsf@oldenburg.str.redhat.com> <1882380.6EOZElgKgl@omega> <87a6mlyopt.fsf@oldenburg.str.redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Spam-Status: No, score=-3.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_PASS, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org 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: , X-List-Received-Date: Sat, 17 Jul 2021 16:39:42 -0000 Hi Florian, > > 1) I understand that it's only for glibc >= 2.34 on Linux (NPTL), > > right? Not on Hurd (HTL)? > > Yes, Hurd hasn't been integrated. > > > 2) /usr/include/gnu/lib-names.h still defines LIBPTHREAD_SO. > > How about not defining LIBPTHREAD_SO, since linking with it is supposed > > to be a no-op in these newer glibc versions? > > I'm not sure if this is the right way, given that the file still exists > for all currently supported targets. Thanks for the rapid answers. > An alternative would be to add a macro to , such as > PTHREAD_IN_LIBC. This would be useful, yes. Like there is a that gives meta- information about functions that are stubs, it is useful to have a way to find out whether a library is a stub. For cross-compilation scenarios, implementing it through a macro in some header file is better than implementing it through some file in /lib/ on the file system. Bruno