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 [63.128.21.124]) by sourceware.org (Postfix) with ESMTP id 1C3533857C4D for ; Thu, 22 Oct 2020 15:37:57 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 1C3533857C4D 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-268-hufPzl0GOpuanUPBrf-xog-1; Thu, 22 Oct 2020 11:37:54 -0400 X-MC-Unique: hufPzl0GOpuanUPBrf-xog-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D3E5F5F9CA; Thu, 22 Oct 2020 15:37:52 +0000 (UTC) Received: from oldenburg2.str.redhat.com (ovpn-112-100.ams2.redhat.com [10.36.112.100]) by smtp.corp.redhat.com (Postfix) with ESMTPS id F19645D9D5; Thu, 22 Oct 2020 15:37:51 +0000 (UTC) From: Florian Weimer To: Adhemerval Zanella Cc: Adhemerval Zanella via Libc-alpha , Alistair Francis Subject: Re: __xstat et al. as compat symbols References: <20200723194641.1949404-1-adhemerval.zanella@linaro.org> <20200723194641.1949404-15-adhemerval.zanella@linaro.org> <87blgw2lyk.fsf_-_@oldenburg2.str.redhat.com> <0b5a532d-3d5a-0574-359e-1993720b9bb3@linaro.org> <87tuunvirb.fsf@oldenburg2.str.redhat.com> <88d0f0d4-3062-d30d-676c-1909594601a0@linaro.org> <877drishd5.fsf@oldenburg2.str.redhat.com> Date: Thu, 22 Oct 2020 17:37:50 +0200 In-Reply-To: (Adhemerval Zanella's message of "Thu, 22 Oct 2020 09:43:41 -0300") Message-ID: <878sbynuep.fsf@oldenburg2.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-6.3 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H5, 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: Thu, 22 Oct 2020 15:37:58 -0000 * Adhemerval Zanella: > Thanks for bring this up, and I agree with you that this breakage might > incur in more headaches than solutions. I will send a fix to export > the xstat symbols in static objects as well, while preserving the compat > symbols on shared objects. Sorry, I do not see how the compat symbols work for the Ocaml use case? The compat symbol is what creates the Ocaml link failure. It has to be a non-compat symbol. We have to rely on lack of use in the installed headers (which does not seem to be a real problem in this particular case). By the way, I verified that glibc 2.0 binaries without symbol versioning can bind to the __xstat compat symbol. Apparently binaries can do that as long as they do not contain any version information at all: 165100: binding file /home/fweimer/src/my/glibc-test-binaries/gcc-2.7.2.3/i386/root/usr/bin/gcc [0] to ./libc.so.6 [0]: normal symbol `__xstat' Thanks, Florian -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill