🚀 go-pugleaf

3 questions:
1) How can I set a watchpoint in this program so that it stops when (i==4)
2) How come it freezes and says single-stepping until function exit and 
never stops?
3) what is the syntax for the break ... if <expr> so that it breaks
on expression?
 
Here is the code:
    
main (argc, argv)
int argc;
char *argv[];
{
    void (*func) ();
    int i;
    
    printf ("Hello world from %s\n", argv[0]); 
    for (i=0; i < 10; i++) /* line 13*/
      printf("%d\n ", i);

    printf("\n");
}

And here is the transcript:

Current directory is /home/PL118a/tb06/thesis/dld-3.2.3/test/simple/
GDB is free software and you are welcome to distribute copies of it
 under certain conditions; type "info copying" to see the conditions.
There is absolutely no warranty for GDB; type "info warranty" for details.
GDB 4.1, Copyright 1991 Free Software Foundation, Inc...
(gdb) r
Starting program: /home/PL118a/tb06/thesis/dld-3.2.3/test/simple/simple 
Hello world from /home/PL118a/tb06/thesis/dld-3.2.3/test/simple/simple
0
 1
 2
 3
 4
 5
 6
 7
 8
 9
 

Program exited with code 01.
(gdb) break main
Breakpoint 1 at 0x22b8: file simple.c, line 10.
(gdb) r
Starting program: /home/PL118a/tb06/thesis/dld-3.2.3/test/simple/simple 

Breakpoint 1, main (argc=1, argv=0xf7fffe1c) at simple.c:10
(gdb) n
Hello world from /home/PL118a/tb06/thesis/dld-3.2.3/test/simple/simple
(gdb) display i
1: i = 0
(gdb) n
1: i = 0
(gdb) n
0
 1: i = 0
(gdb) watch (i==4)
Watchpoint 2: i == 4
(gdb) info watch
    Enb   Expression
#2   y  i == 4
(gdb) n
1: i = 1
(gdb) n
1: i = 1
(gdb) n
Watchpoint 2 disabled because the program has left the block in
which its expression is valid.
1
 1: i = 1
(gdb) n
1: i = 2
(gdb) n
1: i = 2
(gdb) n
0x2328 in printf ()
(gdb) n
Current function has no line number information.
Single stepping until function exit.
2
 n
n
n
n