Bug in g++ ? (binary writing to file)

[Armin Ollig <armin tops net>]

ok,

here's a very short and simple proggy for writing some numbers to a file
*binary*. The output is a double.dat file with a size of 0 bytes, hence
nothing at
all was written. The proggy is from an (ansi) C++ book.
It works as expected with Borlands C++ 5.0 under $95.

If i debug the problem i get:

  0x40066828 in ofstream::open () at fstream.h:87
     fstream.h:87: No such file or directory.

Is this a bug or am i just mad ???

However, it works without a problem if i use ascii io, but refuses to
work with "ios::binary". 

I compile with "g++ -o foo01  foo01.c++". 

My system is a RH5; PC164 21164; Kernel 2.0.33; gcc version 2.7.2.3

...what gdb reports:
(gdb) list
1       #include <iostream.h>
2       #include <stdlib.h>
3       #include <fstream.h>
4       void main(void)
5       {
6         ofstream target;
7         target.open("double.dat", ios::binary);
8         if (!target)
9           {
10            cerr << "could not open file for writing" << endl;
(gdb) break 7
Breakpoint 1 at 0x8048689: file foo01.c++, line 7.
(gdb) run
Starting program: /home/armin/foo01 
step
Breakpoint 1, main () at foo01.c++:7
7         target.open("double.dat", ios::binary);
(gdb) step
0x40066828 in ofstream::open () at fstream.h:87
fstream.h:87: No such file or directory.
(gdb) step

Program exited normally.
(gdb) 


...my programm:
#include <iostream.h>
#include <stdlib.h>
#include <fstream.h>
void main(void)
{
  ofstream target;
  target.open("double.dat", ios::binary);
  if (!target)
    {
      cerr << "could not open file for writing" << endl;
      exit(-1);
    }
  double d=1.0;
  for (int i=0; i < 20; i++, d*=1.1)
    target.write((char *) &d, sizeof(d));

  target.close () ; // if you want...
}




any suggestions welcome :))
thanks in advance,
best regards,
--armin

-- 
 ---------------------------------------------------------------------
| Armin Ollig       UNIX Systems Administration       armin@tops.net  |
|                                                                     |
|            If god is dead who will save the queen ?                 |
 ---------------------------------------------------------------------

--- Begin Message ---

• From: Armin Ollig <armin tops net>
• To: axplist redhat com
• Subject: Bug in g++ ? (binary writing to file)
• Date: Tue, 05 May 1998 13:36:06 +0000

ok,

here's a very short and simple proggy for writing some numbers to a file
*binary*.
The output is a double.dat file with 0 bytes of lenth, hence nothing at
all
was written. The proggy is from an (ansi) C++ book. If i debug the
problem i
get: 0x40066828 in ofstream::open () at fstream.h:87
     fstream.h:87: No such file or directory.

Is this a bug or am i just mad ???
However, it works without a problem if i use ascii io, but refuses to
work with
ios::binary. 

I compile with "g++ -o foo01  foo01.c++". 

My system is a RH5 PC164 21164; Kernel 2.0.33; gcc version 2.7.2.3

...what gdb reports:
(gdb) list
1       #include <iostream.h>
2       #include <stdlib.h>
3       #include <fstream.h>
4       void main(void)
5       {
6         ofstream target;
7         target.open("double.dat", ios::binary);
8         if (!target)
9           {
10            cerr << "could not open file for writing" << endl;
(gdb) break 7
Breakpoint 1 at 0x8048689: file foo01.c++, line 7.
(gdb) run
Starting program: /home/armin/foo01 
step
Breakpoint 1, main () at foo01.c++:7
7         target.open("double.dat", ios::binary);
(gdb) step
0x40066828 in ofstream::open () at fstream.h:87
fstream.h:87: No such file or directory.
(gdb) step

Program exited normally.
(gdb) 


...my programm:
#include <iostream.h>
#include <stdlib.h>
#include <fstream.h>
void main(void)
{
  ofstream target;
  target.open("double.dat", ios::binary);
  if (!target)
    {
      cerr << "could not open file for writing" << endl;
      exit(-1);
    }
  double d=1.0;
  for (int i=0; i < 20; i++, d*=1.1)
    target.write((char *) &d, sizeof(d));

}

thanks in advance,
best regards,
--armin

-- 
 ---------------------------------------------------------------------
| Armin Ollig       UNIX Systems Administration       armin@tops.net  |
|                                                                     |
|            If god is dead who will save the queen ?                 |
 ---------------------------------------------------------------------

--- End Message ---