> 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 <iostream>
> #include <string>
> 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.
test_getline.sh
Description: Binary data
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...".
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...".
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