From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTP id 67C2D3857025 for ; Tue, 18 May 2021 15:51:22 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 67C2D3857025 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-298-03WnjgFhNXiW_LguYMZ5JQ-1; Tue, 18 May 2021 11:51:20 -0400 X-MC-Unique: 03WnjgFhNXiW_LguYMZ5JQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 75251801107; Tue, 18 May 2021 15:51:19 +0000 (UTC) Received: from oldenburg.str.redhat.com (ovpn-112-137.ams2.redhat.com [10.36.112.137]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9348010016FF; Tue, 18 May 2021 15:51:18 +0000 (UTC) From: Florian Weimer To: Andreas Schwab Cc: Florian Weimer via Libc-alpha Subject: Re: [PATCH 00/10] nptl: Complete libpthread removal References: <87eee4ccpd.fsf@igel.home> <87v97g5bi9.fsf@oldenburg.str.redhat.com> <87a6oscbc0.fsf@igel.home> Date: Tue, 18 May 2021 17:51:16 +0200 In-Reply-To: <87a6oscbc0.fsf@igel.home> (Andreas Schwab's message of "Tue, 18 May 2021 17:26:23 +0200") Message-ID: <87r1i459cb.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-6.7 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) 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: Tue, 18 May 2021 15:51:23 -0000 * Andreas Schwab: > On Mai 18 2021, Florian Weimer wrote: > >> * Andreas Schwab: >> >>> On Mai 18 2021, Florian Weimer via Libc-alpha wrote: >>> >>>> We need to provide libpthread.so.0 stub object for use with >>>> memusagestat, otherwise a system libpthread.so.0 might leak into the >>>> link. Not loading libpthread.so.0 is hacked directly into the dynamic >>>> loader. >>> >>> What would happen if the lpthread stub would be loaded? >> >> I made sure that it crashes: > > What's wrong with providing an empty libpthread.so.0, and a no-op > libpthread.{so,a}? I'm already adding a no-op libpthread.a, so that -lpthread keeps working. As far as I can tell, a libpthread.so.0 is not needed because it's not an error for ld if it is missing despite a DT_NEEDED reference. (The stub is not installed, it's only needed because non-cross builds pick up libpng et al. from the system environment.) Thanks, Florian