how to setup breakpoint in gdb with shared library function - gdb

Question

I have problem with gdb, it wasn't stop in one function. Can you explain why and how to stop program after calling strcpy?
grzes#trampek:~/poligon$ gdb ./char_array2
GNU gdb (GDB) 7.2
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/grzes/poligon/char_array2...done.
(gdb) list
1 #include <stdio.h>
2 #include <string.h>
3
4 int main() {
5 char str_a[20];
6 printf("ssss");
7 strcpy(str_a, "Hello, world!\n");
8 printf(str_a);
9 }
10
(gdb) break main
Breakpoint 1 at 0x8048465: file char_array2.c, line 4.
(gdb) run
Starting program: /home/grzes/poligon/char_array2
Breakpoint 1, main () at char_array2.c:4
4 int main() {
(gdb) break strcpy
Breakpoint 2 at 0x1a1205
(gdb) cont
Continuing.
ssssHello, world!
Program exited with code 016.
(gdb) q
grzes#trampek:~/poligon$

Answer 1

You may be using gcc's __builtin_strcpy. Compile with gcc -fno-builtin and see if that helps.
For more info see: http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/C-Dialect-Options.html#C-Dialect-Options