I have installed gdb6 from pkgsrc and it works fine.

I atend to think gdb5 has a bug which I describe below

2007/4/4, Alexander Bubnov <alexander.bubnov@gmail.com>:
> Hello, all!
>
> It is not possbile to debug programs. see actions below
>
> > gcc -g ttt.c
> > cat ttt.c
> #include<stdio.h>
>
> const char* IFNAME="/home/alek/tmp/in.txt";
> const char* OFNAME="/home/alek/tmp/out.txt";
>
> FILE *Fopen(const char*fn, const char*mode)
> {
>     FILE *p = fopen(fn,mode);
>     if(p==NULL)
>     {
>         perror(fn);
>         exit(1);
>     }
>     return p;
> }
>
> int main()
> {
>     FILE *ifs,*ofs;
>     puts("START TEST");
>
>     ifs=Fopen(IFNAME,"r");
>     ofs=Fopen(OFNAME,"w");
>
>     fclose(ifs);
>     fclose(ofs);
>
>     puts("END TEST");
>     return 0;
> }
> > gdb a.out
> GNU gdb 5.3nb1
> Copyright 2002 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386--netbsdelf"...
> (gdb) b main
> Breakpoint 1 at 0x80487f5: file ttt.c, line 20.
> (gdb) r
> Starting program: /home/alek/mera/tv/cr-498/src/a.out
>
> Breakpoint 1, main () at ttt.c:20
> 20          puts("START TEST");
> (gdb) n
> 0x080484dc in init_fallthru ()
> (gdb)
> Single stepping until exit from function init_fallthru,
> which has no line number information.
> START TEST
> END TEST
>
> Program exited normally.
> (gdb) q
>
> I use NetBSD 3.1
>
> Is it a bug?
>