From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8163 invoked by alias); 6 Jul 2017 14:53:15 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 8083 invoked by uid 89); 6 Jul 2017 14:53:11 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.6 required=5.0 tests=BAYES_00,KAM_LAZY_DOMAIN_SECURITY,RCVD_IN_DNSWL_LOW autolearn=no version=3.3.2 spammy=H*c:Mixed, H*c:NHxt, H*c:PHrt, H*c:HHH X-HELO: msa01y.plala.or.jp Received: from msa01.plala.or.jp (HELO msa01y.plala.or.jp) (58.93.240.1) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Thu, 06 Jul 2017 14:53:09 +0000 Received: from msc01.plala.or.jp ([172.23.12.31]) by msa01y.plala.or.jp with ESMTP id <20170706145306.DMCJ30626.msa01y.plala.or.jp@msc01.plala.or.jp> for ; Thu, 6 Jul 2017 23:53:06 +0900 Received: from localhost ([60.34.228.247]) by msc01.plala.or.jp with ESMTP id <20170706145306.EADE16673.msc01.plala.or.jp@localhost> for ; Thu, 6 Jul 2017 23:53:06 +0900 Date: Thu, 06 Jul 2017 14:53:00 -0000 Message-Id: <20170706.235307.636695868819506563.trueroad@trueroad.jp> To: cygwin@cygwin.com Subject: Re: [GCC] C++ program calling std::getline() crashes with certain compilation flags From: Masamichi Hosoda In-Reply-To: <80757ab8baa6434a8c56104c0ebfe803@Antiope.crf.canon.fr> References: <80757ab8baa6434a8c56104c0ebfe803@Antiope.crf.canon.fr> Mime-Version: 1.0 Content-Type: Multipart/Mixed; boundary="--Next_Part(Thu_Jul__6_23_53_07_2017_497)--" Content-Transfer-Encoding: 7bit X-VirusScan: Outbound; msa01m; Thu, 6 Jul 2017 23:53:06 +0900 X-SW-Source: 2017-07/txt/msg00092.txt.bz2 ----Next_Part(Thu_Jul__6_23_53_07_2017_497)-- Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-length: 1137 > The following C++ program crashes when compiled with GCC (both 5.4 and 6.3) under Cygwin, when compiled with both an optimization level higher than -O0 (i.e. -O1, -O2 or -O3) and the C++ standard set to -std=c++nn (for any supported nn, i.e. 98, 03, 11, 14 or 17): > ``` > #include > #include > int main() > { > std::string s; > std::getline(std::cin, s); > std::cout << "You entered \"" << s << "\".\n"; > return 0; > } > ``` > On the other hand, when compiled with -std=gnu++nn or -O0, the program executes normally. For details, run the attached Bash script test_getline.sh, which produces the output contained in the attached file test_getline_Cygwin.txt . No similar problem shows with GCC under Linux. > It looks similar to the problem reported in https://cygwin.com/ml/cygwin/2017-07/msg00088.html which appears to be circumvented by passing -std=gnu++11 instead of -std=c++11. I've tried it with both cygwin-devel-2.8.0-1 and cygwin-devel-2.8.1-1. With cygwin-devel-2.8.1-1, reproduced. With cygwin-devel-2.8.0-1, there is no problem. I've attached the script that I used and the results. ----Next_Part(Thu_Jul__6_23_53_07_2017_497)-- Content-Type: Application/Octet-Stream Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="test_getline.sh" Content-length: 838 Y2F0IDw8RU9GID4gdGVzdF9nZXRsaW5lLmN4eAovLyBMZXQncyBzZWUgaWYg aXQgd29ya3MuLi4KI2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3Ry aW5nPgppbnQgbWFpbigpCnsKICAgIHN0ZDo6c3RyaW5nIHM7CiAgICBzdGQ6 OmdldGxpbmUoc3RkOjpjaW4sIHMpOwogICAgc3RkOjpjb3V0IDw8ICJZb3Ug ZW50ZXJlZCBcIiIgPDwgcyA8PCAiXCIuXG4iOwogICAgcmV0dXJuIDA7Cn0K RU9GCgp1bmFtZSAtYQphcHQtY3lnIHNob3cgfCBncmVwICJjeWd3aW4iCmcr KyAtLXZlcnNpb24KCmZvciBzdGQgaW4gYysrOTggYysrMDMgYysrMTEgYysr MTQgYysrMTcgZ251Kys5OCBnbnUrKzAzIGdudSsrMTEgZ251KysxNCBnbnUr KzE3IDsgZG8KICAgIGZvciBvcHQgaW4gMCAxIDIgMyA7IGRvCiAgICAgICAg ZWNobyAtbiAiIyMjIC1zdGQ9JHtzdGR9IC1PJHtvcHR9ICMjIzogIgogICAg ICAgIGcrKyAtV2FsbCAtV2V4dHJhIC1zdGQ9JHtzdGR9IC1PJHtvcHR9IHRl c3RfZ2V0bGluZS5jeHggLW8gdGVzdF9nZXRsaW5lICYmCiAgICAgICAgICAg IC4vdGVzdF9nZXRsaW5lIDwgdGVzdF9nZXRsaW5lLmN4eAogICAgZG9uZQpk b25lIDI+JjEgfCBzZWQgJ3N8IFx7NSxcfXwgfGcnCg== ----Next_Part(Thu_Jul__6_23_53_07_2017_497)-- Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="test_getline_cygwin-devel-2.8.0-1.txt" Content-length: 3227 CYGWIN_NT-10.0 Z87EXTREAM4 2.8.1(0.312/5/3) 2017-07-03 14:11 x86_64 Cygwin base-cygwin 3.8-1 cygwin 2.8.1-1 cygwin-debuginfo 2.8.1-1 cygwin-devel 2.8.0-1 g++ (GCC) 5.4.0 Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ### -std=c++98 -O0 ###: You entered "// Let's see if it works...". ### -std=c++98 -O1 ###: You entered "// Let's see if it works...". ### -std=c++98 -O2 ###: You entered "// Let's see if it works...". ### -std=c++98 -O3 ###: You entered "// Let's see if it works...". ### -std=c++03 -O0 ###: You entered "// Let's see if it works...". ### -std=c++03 -O1 ###: You entered "// Let's see if it works...". ### -std=c++03 -O2 ###: You entered "// Let's see if it works...". ### -std=c++03 -O3 ###: You entered "// Let's see if it works...". ### -std=c++11 -O0 ###: You entered "// Let's see if it works...". ### -std=c++11 -O1 ###: You entered "// Let's see if it works...". ### -std=c++11 -O2 ###: You entered "// Let's see if it works...". ### -std=c++11 -O3 ###: You entered "// Let's see if it works...". ### -std=c++14 -O0 ###: You entered "// Let's see if it works...". ### -std=c++14 -O1 ###: You entered "// Let's see if it works...". ### -std=c++14 -O2 ###: You entered "// Let's see if it works...". ### -std=c++14 -O3 ###: You entered "// Let's see if it works...". ### -std=c++17 -O0 ###: You entered "// Let's see if it works...". ### -std=c++17 -O1 ###: You entered "// Let's see if it works...". ### -std=c++17 -O2 ###: You entered "// Let's see if it works...". ### -std=c++17 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++98 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++98 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++98 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++98 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++03 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++03 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++03 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++03 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++11 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++11 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++11 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++11 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++14 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++14 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++14 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++14 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++17 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++17 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++17 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++17 -O3 ###: You entered "// Let's see if it works...". ----Next_Part(Thu_Jul__6_23_53_07_2017_497)-- Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="test_getline_cygwin-devel-2.8.1-1.txt" Content-length: 3933 CYGWIN_NT-10.0 Z87EXTREAM4 2.8.1(0.312/5/3) 2017-07-03 14:11 x86_64 Cygwin base-cygwin 3.8-1 cygwin 2.8.1-1 cygwin-debuginfo 2.8.1-1 cygwin-devel 2.8.1-1 g++ (GCC) 5.4.0 Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ### -std=c++98 -O0 ###: You entered "// Let's see if it works...". ### -std=c++98 -O1 ###: ./test_getline.sh: line 19: 20748 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++98 -O2 ###: ./test_getline.sh: line 19: 25148 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++98 -O3 ###: ./test_getline.sh: line 19: 8540 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++03 -O0 ###: You entered "// Let's see if it works...". ### -std=c++03 -O1 ###: ./test_getline.sh: line 19: 16156 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++03 -O2 ###: ./test_getline.sh: line 19: 12172 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++03 -O3 ###: ./test_getline.sh: line 19: 160 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++11 -O0 ###: You entered "// Let's see if it works...". ### -std=c++11 -O1 ###: ./test_getline.sh: line 19: 24840 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++11 -O2 ###: ./test_getline.sh: line 19: 12008 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++11 -O3 ###: ./test_getline.sh: line 19: 8140 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++14 -O0 ###: You entered "// Let's see if it works...". ### -std=c++14 -O1 ###: ./test_getline.sh: line 19: 7376 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++14 -O2 ###: ./test_getline.sh: line 19: 18080 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++14 -O3 ###: ./test_getline.sh: line 19: 22692 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++17 -O0 ###: You entered "// Let's see if it works...". ### -std=c++17 -O1 ###: ./test_getline.sh: line 19: 5796 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++17 -O2 ###: ./test_getline.sh: line 19: 24008 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=c++17 -O3 ###: ./test_getline.sh: line 19: 2844 Aborted (core dumped) ./test_getline < test_getline.cxx ### -std=gnu++98 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++98 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++98 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++98 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++03 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++03 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++03 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++03 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++11 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++11 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++11 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++11 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++14 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++14 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++14 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++14 -O3 ###: You entered "// Let's see if it works...". ### -std=gnu++17 -O0 ###: You entered "// Let's see if it works...". ### -std=gnu++17 -O1 ###: You entered "// Let's see if it works...". ### -std=gnu++17 -O2 ###: You entered "// Let's see if it works...". ### -std=gnu++17 -O3 ###: You entered "// Let's see if it works...". ----Next_Part(Thu_Jul__6_23_53_07_2017_497)-- Content-Type: text/plain; charset=us-ascii Content-length: 219 -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ----Next_Part(Thu_Jul__6_23_53_07_2017_497)----