From: Masamichi Hosoda <trueroad@trueroad.jp>
To: cygwin@cygwin.com
Subject: Re: [GCC] C++ program calling std::getline() crashes with certain compilation flags
Date: Thu, 06 Jul 2017 14:53:00 -0000 [thread overview]
Message-ID: <20170706.235307.636695868819506563.trueroad@trueroad.jp> (raw)
In-Reply-To: <80757ab8baa6434a8c56104c0ebfe803@Antiope.crf.canon.fr>
[-- Attachment #1: Type: Text/Plain, Size: 1137 bytes --]
> 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.
[-- Attachment #2: test_getline.sh --]
[-- Type: Application/Octet-Stream, Size: 616 bytes --]
cat <<EOF > test_getline.cxx
// Let's see if it works...
#include <iostream>
#include <string>
int main()
{
std::string s;
std::getline(std::cin, s);
std::cout << "You entered \"" << s << "\".\n";
return 0;
}
EOF
uname -a
apt-cyg show | grep "cygwin"
g++ --version
for std in c++98 c++03 c++11 c++14 c++17 gnu++98 gnu++03 gnu++11 gnu++14 gnu++17 ; do
for opt in 0 1 2 3 ; do
echo -n "### -std=${std} -O${opt} ###: "
g++ -Wall -Wextra -std=${std} -O${opt} test_getline.cxx -o test_getline &&
./test_getline < test_getline.cxx
done
done 2>&1 | sed 's| \{5,\}| |g'
[-- Attachment #3: test_getline_cygwin-devel-2.8.0-1.txt --]
[-- Type: Text/Plain, Size: 3227 bytes --]
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...".
[-- Attachment #4: test_getline_cygwin-devel-2.8.1-1.txt --]
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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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prev parent reply other threads:[~2017-07-06 14:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-06 13:07 TANNHAUSER Falk
2017-07-06 14:21 ` Dan Kegel
2017-07-07 11:31 ` TANNHAUSER Falk
2017-07-13 12:01 ` TANNHAUSER Falk
2017-07-06 14:53 ` Masamichi Hosoda [this message]
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