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 5DE613858D29 for ; Mon, 22 Feb 2021 21:20:04 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 5DE613858D29 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-232-4coaxDCLNBiyvjE1675Q2w-1; Mon, 22 Feb 2021 16:19:15 -0500 X-MC-Unique: 4coaxDCLNBiyvjE1675Q2w-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 80AB7107ACE4; Mon, 22 Feb 2021 21:19:14 +0000 (UTC) Received: from oldenburg.str.redhat.com (ovpn-113-131.ams2.redhat.com [10.36.113.131]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6536239A4B; Mon, 22 Feb 2021 21:19:13 +0000 (UTC) From: Florian Weimer To: Adhemerval Zanella via Libc-alpha Subject: Re: [RFC][PATCH v8 18/20] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE dynamic section+flag to glibc DSOs References: <20210209171839.7911-1-vivek@collabora.com> <20210209171839.7911-19-vivek@collabora.com> Date: Mon, 22 Feb 2021 22:19:55 +0100 In-Reply-To: (Adhemerval Zanella via Libc-alpha's message of "Mon, 22 Feb 2021 17:39:24 -0300") Message-ID: <87a6rv3imc.fsf@oldenburg.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 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-6.4 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: Mon, 22 Feb 2021 21:20:05 -0000 * Adhemerval Zanella via Libc-alpha: > We have some options to fix it: > > 1. Bump the minimum supported binutils version to 2.36. It would be > a large change, since we usually do incremental changes over releases > (the binutils 2.25 change from 2.22 was done on glibc 2.26). > > 2. Add a configure check and enable RTLD_SHARED iff ld supports > -z unique. It would require return EINVAL is RTLD_SHARED or > RTLD_ISOLATE if the configure check see the binutils do not > support it (and extend the check for the tests to return > UNSUPPORTED in such case). > > 3. Find a way to force add DF_GNU_1_UNIQUE on older binutils > (since its support is just a dynamic section existence) (1) is fine, I think. Moving from 2.25 (2015) to 2.26 (2016) isn't that big of a change. > The 3. is a hackery solution, but might work without incurring a toolchain > requirement bump (however I am not this is a easy solution). There's a thread about this: Creating arbitrary dynamic tags with BFD ld (Search machine indexing of sourceware.org mailing lists is really poor these days unfortunately.) Thanks, Florian