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 [216.205.24.124]) by sourceware.org (Postfix) with ESMTPS id 1BAD73857819 for ; Thu, 28 Oct 2021 13:43:21 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 1BAD73857819 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-521-hYfobjj-OPiy8_8a7p8j_Q-1; Thu, 28 Oct 2021 09:43:19 -0400 X-MC-Unique: hYfobjj-OPiy8_8a7p8j_Q-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 588BC1018F6E; Thu, 28 Oct 2021 13:43:17 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.194.250]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7F3715D9DE; Thu, 28 Oct 2021 13:43:15 +0000 (UTC) From: Florian Weimer To: "H.J. Lu" Cc: "H.J. Lu via llvm-dev" , GNU C Library , Binutils , GCC Development , GNU gABI gnu-gabi Subject: Re: [llvm-dev] [PATCH] Add GNU_PROPERTY_1_GLIBC_2_NEEDED References: <87zgqtljzj.fsf@oldenburg.str.redhat.com> Date: Thu, 28 Oct 2021 15:43:13 +0200 In-Reply-To: (H. J. Lu's message of "Thu, 28 Oct 2021 06:39:46 -0700") Message-ID: <87lf2dl0y6.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 2.79 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_LOW, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, 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: gnu-gabi@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gnu-gabi mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Oct 2021 13:43:22 -0000 * H. J. Lu: > On Wed, Oct 27, 2021 at 11:52 PM Florian Weimer wrote: >> >> * H. J. Lu via llvm-dev: >> >> > 1. Some binaries which require new ELF features, like DT_RELR, only >> > work with the new glibc binary. They crash at run-time with the older >> > glibc binaries. >> > 2. Somes binaries compiled with the new language features, like C2X >> > printf specifiers, only generate correct results with the new glibc >> > binary. Since we don't add new glibc versions to the printf function >> > family, they generate incorrect results at run-time with the older >> > glibc binaries. >> >> Solaris uses SHT_SUNW_verneed sections for this, not a property note. >> Property notes seem the wrong approach for this. And there is no reason >> to make this specific to glibc. >> >> However, I still very much dislike this proposal. >> > > Can you share your concerns? See the other thread (mostly on libc-alpha I think). Florian