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 [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id 86ECE3858D3C for ; Wed, 1 Feb 2023 11:40:58 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 86ECE3858D3C Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675251658; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:in-reply-to:in-reply-to: references:references; bh=BhDVoVIEYpInETAiTjXEvc5gCpb9N7H7R4ui/gjBfvg=; b=CZKd/0WhKF+PC4Gg+aaZOAdv27CuZTgH4pmnu4lgr2/idyQcjk3NAgVgBHqGoWD+X3jKi2 8xxmPeK3llC1BU+5IW6kLQjr5zg59CaKXmNFAmjiP4H8ddula2j7xpdpba8FcyWoBY90qn M6z5DKuBFkwIJLnp3y2G6mjIXFOdhKI= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-471-Kgb2C0hRMJ67XV25uRZ3Zw-1; Wed, 01 Feb 2023 06:40:55 -0500 X-MC-Unique: Kgb2C0hRMJ67XV25uRZ3Zw-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CABDE1C08789; Wed, 1 Feb 2023 11:40:54 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.192.223]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5ABFC492C3E; Wed, 1 Feb 2023 11:40:54 +0000 (UTC) Received: from tucnak.zalov.cz (localhost [127.0.0.1]) by tucnak.zalov.cz (8.17.1/8.17.1) with ESMTPS id 311BepIT3219466 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Wed, 1 Feb 2023 12:40:51 +0100 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 311BepFR3219465; Wed, 1 Feb 2023 12:40:51 +0100 Date: Wed, 1 Feb 2023 12:40:50 +0100 From: Jakub Jelinek To: Florian Weimer Cc: libc-alpha@sourceware.org, gcc@gcc.gnu.org, fortran@gcc.gnu.org Subject: Re: libquadmath, glibc, and the Q format flag Message-ID: Reply-To: Jakub Jelinek References: <87lelhzmad.fsf@oldenburg.str.redhat.com> <878rhhzksh.fsf@oldenburg.str.redhat.com> MIME-Version: 1.0 In-Reply-To: <878rhhzksh.fsf@oldenburg.str.redhat.com> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Spam-Status: No, score=-3.8 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_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Wed, Feb 01, 2023 at 12:29:02PM +0100, Florian Weimer via Gcc wrote: > >> This impacts most (all?) Fortran code on GNU/Linux because libgfortran > >> depends on libquadmath. > > > > Not anymore. > > If GCC is configured against new enough glibc (with _Float128 support) > > libgfortran.so.5 is no longer linked against -lquadmath, and -lquadmath > > is added only --as-needed to ld command line, so if all the Fortran object > > files that need real(kind=16) (or quad complex) are built by such configured > > GCC, -lquadmath is not linked in (just needs to be present). > > Hmm, I missed that recent change. > > Would it make sense to drop the libgfortran RPM dependency on > libquadmath in Fedora rawhide? This is a downstream question. We could drop it from libgfortran (package that contains just the shared library), but we still need it on gcc-gfortran (as the library is used during linking for backwards compatibility reasons). Jakub