From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp-out-so.shaw.ca (smtp-out-so.shaw.ca [64.59.136.137]) by sourceware.org (Postfix) with ESMTPS id CAB153857C7D for ; Sun, 30 Aug 2020 20:07:54 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org CAB153857C7D Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=SystematicSw.ab.ca Authentication-Results: sourceware.org; spf=none smtp.mailfrom=brian.inglis@systematicsw.ab.ca Received: from [192.168.1.104] ([24.64.172.44]) by shaw.ca with ESMTP id CTcFkvzRl695cCTcGkaOfj; Sun, 30 Aug 2020 14:07:53 -0600 X-Authority-Analysis: v=2.3 cv=fZA2N3YF c=1 sm=1 tr=0 a=kiZT5GMN3KAWqtYcXc+/4Q==:117 a=kiZT5GMN3KAWqtYcXc+/4Q==:17 a=IkcTkHD0fZMA:10 a=CCpqsmhAAAAA:8 a=JZeu4sPTHj9YQVegERsA:9 a=QEXdDO2ut3YA:10 a=ul9cdbp4aOFLsgKbc677:22 From: Brian Inglis Subject: Re: cpp /usr/include/threads.h fails; modfl segfaults Reply-To: cygwin@cygwin.com To: cygwin@cygwin.com References: <02b16d2e-9d51-de58-807b-3b31b2565b59.ref@aol.com> <02b16d2e-9d51-de58-807b-3b31b2565b59@aol.com> <9f819e67-5476-ea48-a13f-f7a4b25d6e69@cornell.edu> <12c7b933-d06e-3b92-9c50-a1c3ad353a48@aol.com> <4c895636-eebc-426d-33f2-2f587a181a2d@cornell.edu> <871rjod54j.fsf@Otto.invalid> Autocrypt: addr=Brian.Inglis@SystematicSw.ab.ca; prefer-encrypt=mutual; keydata= mDMEXopx8xYJKwYBBAHaRw8BAQdAnCK0qv/xwUCCZQoA9BHRYpstERrspfT0NkUWQVuoePa0 LkJyaWFuIEluZ2xpcyA8QnJpYW4uSW5nbGlzQFN5c3RlbWF0aWNTdy5hYi5jYT6IlgQTFggA PhYhBMM5/lbU970GBS2bZB62lxu92I8YBQJeinHzAhsDBQkJZgGABQsJCAcCBhUKCQgLAgQW AgMBAh4BAheAAAoJEB62lxu92I8Y0ioBAI8xrggNxziAVmr+Xm6nnyjoujMqWcq3oEhlYGAO WacZAQDFtdDx2koSVSoOmfaOyRTbIWSf9/Cjai29060fsmdsDLg4BF6KcfMSCisGAQQBl1UB BQEBB0Awv8kHI2PaEgViDqzbnoe8B9KMHoBZLS92HdC7ZPh8HQMBCAeIfgQYFggAJhYhBMM5 /lbU970GBS2bZB62lxu92I8YBQJeinHzAhsMBQkJZgGAAAoJEB62lxu92I8YZwUBAJw/74rF IyaSsGI7ewCdCy88Lce/kdwX7zGwid+f8NZ3AQC/ezTFFi5obXnyMxZJN464nPXiggtT9gN5 RSyTY8X+AQ== Organization: Systematic Software Message-ID: Date: Sun, 30 Aug 2020 14:07:51 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <871rjod54j.fsf@Otto.invalid> Content-Type: text/plain; charset=utf-8 Content-Language: en-CA Content-Transfer-Encoding: 7bit X-CMAE-Envelope: MS4wfGe2Tu4lOO2Bc4gYKXglfK/9WzFcDZ1C9ef1stz8ABxFHeIqp9BkFYo57rLWcr200e8e6Rxtpe8ttWtv+59U9adZI03PbaPCsLiHGDrMVE1ppMGMxa8k MRE048tKbPwstAz6pG3uY1WQyspFuGp9VNsQzpslas6rmMTLZv1AkipNkpE6NVOzhEKt6jBUXYKpcg== X-Spam-Status: No, score=-7.3 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS, KAM_LAZY_DOMAIN_SECURITY, NICE_REPLY_A, RCVD_IN_DNSWL_LOW, 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: Sun, 30 Aug 2020 20:07:56 -0000 On 2020-08-30 00:23, ASSI wrote: > Ken Brown via Cygwin writes: >> OK, so the problem was introduced between 3.1.4 and 3.1.5. It should >> be pretty easy to bisect and find the culprit. I'll do that tomorrow >> if no one beats me to it. > > The most likely culprit would be this I think: > > https://sourceware.org/git/?p=newlib-cygwin.git;a=commitdiff;h=4ad9ba42fc3dd116bad8b9cb89d434256d3431fb > > If so and depending on why exactly it fails, there might be more fallout > from other similar changes. OP debugged to display winsup/cygwin/math/modfl.c assembler that hasn't changed since added, so compiler, build, or runtime environment updates may have changed the code generated or used e.g. predefined symbols, build flags, runtime CPU features. Does Cygwin detect and allow GCC builtins to be used where available, keeping the function available for fallback where the compiler can't use the builtin? -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. [Data in IEC units and prefixes, physical quantities in SI.]