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From:	TANNHAUSER Falk <Falk DOT Tannhauser AT crf DOT canon DOT fr>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	[GCC] C++ program calling std::getline() crashes with certain compilation flags
Date:	Thu, 6 Jul 2017 13:07:26 +0000
Message-ID:	<80757ab8baa6434a8c56104c0ebfe803@Antiope.crf.canon.fr>
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--_003_80757ab8baa6434a8c56104c0ebfe803Antiopecrfcanonfr_
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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 -O=
0 (i.e. -O1, -O2 or -O3) and the C++ standard set to -std=3Dc++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=3Dgnu++nn or -O0, the program ex=
ecutes normally. For details, run the attached Bash script test_getline.sh,=
 which produces the output contained in the attached file test_getline_Cygw=
in.txt . No similar problem shows with GCC under Linux.
It looks similar to the problem reported in https://cygwin.com/ml/cygwin/20=
17-07/msg00088.html which appears to be circumvented by passing -std=3Dgnu+=
+11 instead of -std=3Dc++11.
Under GDB, a faulty executable produces a message like:
```
Thread 1 "test_getline" received signal SIGABRT, Aborted.
0x00000003bf12576b in cygstdc++-6!_ZNSs7reserveEm () from /usr/bin/cygstdc+=
+-6.dll
```
Un-mangling _ZNSs7reserveEm through c++filt gives
std::basic_string<char, std::char_traits<char>, std::allocator<char> >::res=
erve(unsigned long)

Falk

--_003_80757ab8baa6434a8c56104c0ebfe803Antiopecrfcanonfr_
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