[Bug c++/65257] New: cin not working with empty string when _GLIBCXX_DEBUG is defined on Windows

[Bug c++/65257] New: cin not working with empty string when _GLIBCXX_DEBUG is defined on Windows

[melnakeeb at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65257

            Bug ID: 65257
           Summary: cin not working with empty string when _GLIBCXX_DEBUG
                    is defined on Windows
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: melnakeeb at hotmail dot com

Using latest Cygwin32 ,Cygwin64 and MinGW32 with GCC 4.9.2 , 4.9.2 and 4.8.1
respectively on Windows 7 64-bit. I am testing also on 32-bit Linux using GCC
4.8.2.

So on all systems this works

#include <bits/stdc++.h>
using namespace std;
string s,t;
int main(){
  cin>>s>>t;
  cout<<s;
}
and this works

#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
string s="a",t="b";
int main(){
    cin>>s>>t;
    cout<<s;
}
but the next one crashes on Windows after inputting the first string on the 3
configurations mentioned above, but works correctly on Linux:

#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
string s,t;
int main(){
    cin>>s>>t;
    cout<<s;
}
Clearly the only difference is that the string is empty before inputting, and
_GLIBCXX_DEBUG is enabled.

Previous discussions:
http://stackoverflow.com/questions/28708802/cin-not-working-with-empty-string-when-glibcxx-debug-on-windows
, http://sourceforge.net/p/mingw/bugs/1666/
and http://codeforces.com/blog/entry/15547#comment-215143

[Bug libstdc++/65257] cin not working with empty string when _GLIBCXX_DEBUG is defined on Windows

[nightstrike at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65257

nightstrike <nightstrike at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nightstrike at gmail dot com

--- Comment #1 from nightstrike <nightstrike at gmail dot com> ---
(In reply to Muhammad Annaqeeb from comment #0)

> #define _GLIBCXX_DEBUG
> #include <bits/stdc++.h>
> using namespace std;
> string s,t;
> int main(){
>     cin>>s>>t;
>     cout<<s;
> }

FWIW, this works on Wine as well as Cygwin + Win 7, compiled with g++ 14,
configured *without* --enable-fully-dynamic-string.

[Bug libstdc++/65257] cin not working with empty string when _GLIBCXX_DEBUG is defined on Windows

[nightstrike at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65257

--- Comment #2 from nightstrike <nightstrike at gmail dot com> ---
I should clarify that I tested this with mingw-w64, not mingw.org where the bug
was originally reported.

[Bug libstdc++/65257] cin not working with empty string when _GLIBCXX_DEBUG is defined on Windows

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65257

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-01-17

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Muhammad, is this still an issue for you?