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bh=koqNnQ0jFW9/Uw30gNgHh2j5lZ9HDk1l8UEl1//TM7I=; b=G4ByZi6OqkgMWm5gzWlXq23IWz9Wt3pJ0rffA4JRhp+y7fnSSTWJEU5/ARGz4lakRXr22V mr9fWd/nK1bhKdHoaE/+FvhzinMx1UPUAYD+GuUEo9K5Ic+TQv2559qrBpVa9XBI5iKcJM I6Kv4KvBEMglXx0y5AcPQWyWD5YUhz4= 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-408-0wuFOzZnOuCZZXvrYxPKgw-1; Fri, 23 Apr 2021 04:07:14 -0400 X-MC-Unique: 0wuFOzZnOuCZZXvrYxPKgw-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 3F0E0881D6D; Fri, 23 Apr 2021 08:07:13 +0000 (UTC) Received: from gondolin.fritz.box (ovpn-113-167.ams2.redhat.com [10.36.113.167]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1B1A9690F4; Fri, 23 Apr 2021 08:07:10 +0000 (UTC) Date: Fri, 23 Apr 2021 10:07:08 +0200 From: Cornelia Huck To: Thomas Huth Subject: Re: Compiling the s390-ccw bios with clang (was: Re: s390-ccw: warning: writing 1 byte into a region of size 0) Message-ID: <20210423100708.262eeaf0.cohuck@redhat.com> In-Reply-To: <8abfb851-a5d2-8608-fe96-2eb3014adb96@redhat.com> References: <089df242-8788-a162-4a75-4c9c9e04a64e@redhat.com> <8afd0f34-7e75-2661-9ea5-3ebadff3b85d@redhat.com> <2ec6e995-6833-1ebd-03c8-a3fede7fddb8@de.ibm.com> <20210422155238.kak7tl3xnup5vod7@steredhat> <20210423064001.fjouibdcwadtgijy@steredhat> <8abfb851-a5d2-8608-fe96-2eb3014adb96@redhat.com> Organization: Red Hat GmbH MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=cohuck@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , "Daniel P. =?UTF-8?B?QmVycmFuZ8Op?=" , Janosch Frank , Richard Henderson , qemu-devel , Christian Borntraeger , qemu-s390x , Philippe =?UTF-8?B?TWF0aGlldS1EYXVkw6k=?= , Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, 23 Apr 2021 09:57:08 +0200 Thomas Huth wrote: > On 23/04/2021 08.52, Christian Borntraeger wrote: > [...] > > We can of course discuss if we compile the BIOS for z10 instead of z900. TCG > > in the mean time can handle up to z13 and z10 is now also 13 years old. > > I'd really like to see us supporting Clang in the s390-ccw bios, too, since > it provides additional useful compiler warnings ... but switching the -mz900 > to -mz10 here also means that we could not boot VMs anymore that use a CPU > that is older than the z10... We could still boot a kernel/initrd directly, couldn't we? > > Is anybody still using such old CPUs? Should we maybe deprecate all CPUs > that are older than the z10 in QEMU? Alternatively, we could try to detect > Clang in the Makefile, and only use -mz10 in that case and continue to use > -mz900 in the other case...? So, the issue with clang is that it compiles to at least a z10, right? Any other issues we know about?