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[83.57.169.13]) by smtp.gmail.com with ESMTPSA id z63sm9258465wme.8.2021.01.14.07.09.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Jan 2021 07:09:53 -0800 (PST) Subject: Re: [PATCH v3 1/2] Fix net.c warning on GCC 11 To: Alexander Bulekov , Miroslav Rezanina References: <4fd8d2a3-e665-4422-79e0-4e2a7337e4fc@redhat.com> <20210114141920.qjsnlt3cmkauggtw@mozz.bu.edu> <20210114143803.vow3l6r5nlugz6sc@lws.brq.redhat.com> <20210114144217.7kjo6h7luxcbxxml@mozz.bu.edu> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: Date: Thu, 14 Jan 2021 16:09:52 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20210114144217.7kjo6h7luxcbxxml@mozz.bu.edu> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.248, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.237, 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=ham 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: Jason Wang , Dmitry Fleytman , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 1/14/21 3:42 PM, Alexander Bulekov wrote: > On 210114 1538, Miroslav Rezanina wrote: >> On Thu, Jan 14, 2021 at 09:19:20AM -0500, Alexander Bulekov wrote: >>> On 210114 1415, Philippe Mathieu-Daudé wrote: >>>> +Jason +Dmitry >>>> >>>> On 1/14/21 8:07 AM, Miroslav Rezanina wrote: >>>>> When building qemu with GCC 11, compiling eth.c file produce following warning: >>>>> >>>>> warning: array subscript 'struct ip6_ext_hdr_routing[0]' is partly outside array bounds of 'struct ip6_ext_hdr[1]' [-Warray-bounds] >>>>> >>>>> This is caused by retyping from ip6_ext_hdr to ip6_ext_hdr_routing that has more >>>>> attributes. >>>>> >>>>> As this usage is expected, suppress the warning temporarily through the function >>>>> using this retyping. >>>> >>>> This is not expected, this is a bug... >>>> >>> >>> Seems related: https://bugs.launchpad.net/qemu/+bug/1879531 >>> -Alex >>> >> >> Yes, it is caused by the issue triggering the warning. Do you know >> whether the patch mentioned in bug was already sent? >> >> Mirek > > I don't think so.. Just sent one: https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg03205.html