Re: GCC 7.3.0 -std=gnu++17 failed to getline() from std::ifstream

[Ross Smith <ross dot smith at otoy dot com>]

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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