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-Status: No, score=-4.2 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, 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 3BC641F4B4 for ; Thu, 22 Oct 2020 15:38:00 +0000 (UTC) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 136A8386F019; Thu, 22 Oct 2020 15:37:59 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 136A8386F019 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1603381079; bh=qMsevWdky0IHY4LrzSxVoE+TFVXrLvI4qxkXO0hER18=; h=To:Subject:References:Date:In-Reply-To:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=kQlUoNC34k8SxqWVvwZf5UgC2ZtLCPD2D0T+F6zDeD4EkGAS4pxRx0lrbSEpB7oBK /h2ioF2ShaUWGZCbX4AOS3rB45G1Zrlpg5MNRqSLr8oq0lab0ykGu4tWVRhVl8o/St y03ZQXcfKkDPOcVxa5Yoe1W8FBNLZL2umPRx40Sw= 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) To: Adhemerval Zanella 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-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: , From: Florian Weimer via Libc-alpha Reply-To: Florian Weimer Cc: Alistair Francis , Adhemerval Zanella via Libc-alpha Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" * 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