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Subject: Re: GCC 7.3.0 -std=gnu++17 failed to getline() from std::ifstream
To: cygwin AT cygwin DOT com
Newsgroups: gmane.os.cygwin
References: <CAHVoUt2pHP46o6ERwx9HB5=Dn-J9xv5i-53RYtJbdev-K9DCeQ AT mail DOT gmail DOT com> <a7b8e684-f985-f8f2-c7f2-79e618e8ece1 AT gmail DOT com>
From: Ross Smith <ross DOT smith AT otoy DOT com>
Message-ID: <0d0d9dc4-5cce-724a-6fb2-7bf0a5a71db4@otoy.com>
Date: Mon, 11 Jun 2018 14:11:58 +1200
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On 2018-06-06 09:00, Marco Atzeri wrote:
> On 6/5/2018 10:32 PM, Ivan Shynkarenka wrote:
>>   Hello
>>
>> I use x64 bit Cygwin and it failed in my home, work and Appveyor.  I add
>> cygcheck.out with my environment.
>>
>> I'm sorry about misspell prefix space in my prev example. Please try the
>> following one:
>>
>> #include <fstream>
>> #include <iostream>
>>
>> int main(int argc, char** argv)
>> {
>>      std::string line;
>>      std::ifstream stream("test.cpp");
>>      while (getline(stream, line))
>>          std::cout << line << std::endl;
>>      return 0;
>> }
>>
>> g++ -std=gnu++17 test.cpp
> 
> works fine on 32 bit and 64 bit on my W7

I'm having the same problem. My test program:

#include <fstream>
#include <iostream>
int main() {
     std::ifstream in("demo.cpp");
     std::string line;
     for (;;) {
         std::getline(in, line);
         if (! in && line.empty())
             break;
         std::cout << line << "\n";
     }
}

$ g++ demo.cpp -std=c++17 -o demo && ./demo
Aborted (core dumped)

It's crashing on the call to std::getline(). It only happens in
-std=gnu++17 mode (or the equivalent gnu++1z, or c++17/1z). If I
compile with -std=gnu++14 or lower it works. I'm using 64-bit
Cygwin, everything updated to the current release, on Windows 8.1.

Ross Smith

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