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 257EE3890412 for ; Tue, 12 Jan 2021 11:20:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 257EE3890412 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-238-BforwwDrPMSETlNbBrvn2Q-1; Tue, 12 Jan 2021 06:20:12 -0500 X-MC-Unique: BforwwDrPMSETlNbBrvn2Q-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2B409108E1A5; Tue, 12 Jan 2021 11:20:11 +0000 (UTC) Received: from oldenburg2.str.redhat.com (ovpn-114-67.ams2.redhat.com [10.36.114.67]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 40D0B60C5B; Tue, 12 Jan 2021 11:20:10 +0000 (UTC) From: Florian Weimer To: Adhemerval Zanella via Libc-alpha Cc: Fangrui Song , Adhemerval Zanella Subject: Re: [PATCH 3/3] install: Replace scripts/output-format.sed with objdump -f [BZ #26559] References: <20201228194855.510315-1-maskray@google.com> <20201228194855.510315-4-maskray@google.com> <0be74da1-a490-be53-86e1-8469dc0b9428@linaro.org> Date: Tue, 12 Jan 2021 12:20:08 +0100 In-Reply-To: <0be74da1-a490-be53-86e1-8469dc0b9428@linaro.org> (Adhemerval Zanella via Libc-alpha's message of "Fri, 8 Jan 2021 16:38:27 -0300") Message-ID: <87im82jtav.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 10.5.11.13 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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: Tue, 12 Jan 2021 11:20:15 -0000 * Adhemerval Zanella via Libc-alpha: > On 28/12/2020 16:48, Fangrui Song via Libc-alpha wrote: >> GNU ld and gold have supported --print-output-format since 2011. glibc >> requires binutils>=3D2.25 (2015), so if LD is GNU ld or gold, we can >> assume the option is supported. >>=20 >> lld is by default a cross linker supporting multiple targets. It auto >> detects the file format and does not need OUTPUT_FORMAT. It does not >> support --print-output-format. >>=20 >> By parsing objdump -f, we can support all the three linkers. > > LGTM and this change seems orthogonal to the other lld adjustments. > I have checked that at least with a build for a handful of supported > ABIs I see no difference with ld.bfd (with multiple versions). I see a cross-build failure during the initial static link bootstrap on aarch64-linux-gnu during =E2=80=9Cmake install=E2=80=9D: make[2]: Entering directory '/home/bmg/src/glibc' aarch64-glibc-linux-gnu-gcc -shared -Wl,-dynamic-linker=3D/lib/ld-linux-= aarch64.so.1 \ -Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=3Dboth \ -x c /dev/null -o /home/bmg/build/compilers/aarch64-linux-gnu/gli= bc/aarch64-linux-gnu/format.lds.so /home/bmg/install/compilers/aarch64-linux-gnu/lib/gcc/aarch64-glibc-linux-g= nu/10.2.1/../../../../aarch64-glibc-linux-gnu/bin/ld: cannot find crti.o: N= o such file or directory /home/bmg/install/compilers/aarch64-linux-gnu/lib/gcc/aarch64-glibc-linux-g= nu/10.2.1/../../../../aarch64-glibc-linux-gnu/bin/ld: cannot find crtn.o: N= o such file or directory collect2: error: ld returned 1 exit status make[2]: *** [Makerules:1070: /home/bmg/build/compilers/aarch64-linux-gnu/g= libc/aarch64-linux-gnu/format.lds] Error 1 This affects other targets as well. I guess using $(CC) -nostdlib -nostartfiles -shared -x assembler /dev/null should work on most targets here. Thanks, Florian --=20 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'N= eill