From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.134]) by sourceware.org (Postfix) with ESMTPS id E2BAD3896C29 for ; Thu, 13 May 2021 08:57:51 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org E2BAD3896C29 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=towo.net Authentication-Results: sourceware.org; spf=none smtp.mailfrom=towo@towo.net Received: from [192.168.178.74] ([91.65.218.78]) by mrelayeu.kundenserver.de (mreue009 [212.227.15.167]) with ESMTPSA (Nemesis) id 1MKKdD-1lwAGv1wIJ-00LnnV for ; Thu, 13 May 2021 10:57:50 +0200 Subject: Re: [ANNOUNCEMENT] Test: {mingw64-{i686,x86_64}-,}gcc-11.1.0-0.1 To: cygwin@cygwin.com References: <87mtszzsvd.fsf@Rainer.invalid> From: Thomas Wolff Message-ID: <29a53ee2-cac3-6815-792d-36f96be47bd1@towo.net> Date: Thu, 13 May 2021 10:57:50 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <87mtszzsvd.fsf@Rainer.invalid> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:6Cy8Z0TcLxw2JOHrA5L1XTKXb/2dbw9ora0h5Kz1O4cHVhMycVK 05Qw3my6bARrQDlZkRuqfJBaliSpjbpT0Qxn6pi/ACvRKD+xDsWK05Bq180ku9w/VDjAUOY qsT3hyQv2whPtAJfTKvZacoe5+fUdZwnryXsZt/XwLz+yAKC4OQFaTI5AHAcuu7DXROSgZu zthsMLcbjvrlv7tbBD2MQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:APBsiawKBIQ=:jjon8agokOMtm5FjBb2USP BaWSFt0QpIojYiVZO/IbVgcepdOEf/rB9qTUFwuMmMxtUpOTAHxyD9f1zq+AaqGrxjyS/TIo0 FQLEhYESo9aaW4T+FzZvPqI4qmrz7X4BGU3/7gy833D82aww7SnDFcZQSzrMSZMMtntJqX2KG 7aGasfK5M6ITlSWX/hUr9BwUbldxP7LY/r3C05j9KLNukavrDx0BYdlFj1mJ9LkdAxcOMueci TsL5L8G60U152SAwEV6xqT6v1x9gLrMpt5h/Nu2BqafzZABkW/tHBTC9LLIEh2O+XB42rpHtU hD+tf5VejdnBRfxg2e7LOJq0kNUCH4+xGqKr7E9bWvE+i6YKosCT4Yi48mTRQq3/qg1WqtUKw VHwDttBDQF+3tySG4pOVMJIN26A2xl7N4vW8z+vl11mKwFnmbQEkXT/fpeaocXaRVM6+0fg+T aPdH2IGrdaqdOhfAHfLRao2i8HZo/HVJ0it9NWHBAtV+cCFS6LpKnFy+eSiUJhn7/vCBg/VDK oBv3xr1KoO+x5p6sKE0a+o= X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS, KAM_LAZY_DOMAIN_SECURITY, KAM_NUMSUBJECT, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 May 2021 08:57:53 -0000 Am 12.05.2021 um 20:53 schrieb Achim Gratz: > Thomas Wolff writes: >> Am 10.05.2021 um 21:13 schrieb Achim Gratz: >>> The native and mingw-w64 cross compilers have been updated for both >>> architectures to the latest upstream release version: >>> >>> gcc-11.1.0-0.1 >> Are there any known problems with gcc 11? My program crashes if >> compiled with gcc -O2; gcc -O1 works, gcc 10 also works. > None that I'd know of, especially given that very vague symptoms. While > I guess it's possible that there's a bug in the optimizer, I'd first > attempt to rule out undefined behaviour in the program being compiled. The crash vanishes after removing a few lines from a conditional (if block) where the condition is false. This smells like wrong calculation of a relative jump (Intel "short jump") by the optimizer. > > > Regards, > Achim.