[Bug c++/11436] New: ios::app bug on RedHat 7.3 with gcc 3.3

[Bug c++/11436] New: ios::app bug on RedHat 7.3 with gcc 3.3

[p_hodigere at yahoo dot com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11436

           Summary: ios::app bug on RedHat 7.3 with gcc 3.3
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: p_hodigere at yahoo dot com
                CC: gcc-bugs at gcc dot gnu dot org

Using ios::app to open a file fails on RH 7.3 when compiled with gcc 3.3. The 
same application can open the file in append mode when compiled with gcc 2.96.

Attached is the test aplication.

All the following combinations of open mode's fail:
fp.open("some file", ios::app);
fp.open("some file", ios::in | ios::app);
fp.open("some file", ios::in | ios::out | ios::app);

In order to open the file in append mode, both ios::out and ios::app need to 
be used:
fp.open("some file", ios::out | ios::app);

Find below a test application to reproduce this bug.

-Pradeep

#include <iostream.h>
#include <fstream.h>

int main() {

fstream fp;

    fp.open("test.txt", ios::app);

    if (fp.is_open() ) {
        fp << "test\n";
        fp.close();
    }
    else
        cout << "Unable to open file";

    return 0;
}

[Bug libstdc++/11436] ios::app bug on RedHat 7.3 with gcc 3.3

[bangerth at dealii dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11436


bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |libstdc++

[Bug libstdc++/11436] ios::app bug on RedHat 7.3 with gcc 3.3

[reichelt at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11436


reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


------- Additional Comments From reichelt at gcc dot gnu dot org  2003-07-05 20:54 -------
Not a bug.

According to paragraph 27.8.1.3, there are only two valid modes for opening a
file using ios::app, namely

1.) ios::out | ios::app
2.) ios::out | ios::app | ios::binary

Previous versions of gcc just were less picky.

Regards,
Volker