A question for built-in functions..

[Ish Rattan]

System is Solaris-8 (SunBalde-100) running gcc-2.95.2.

The following program (main.c) when compiled with -c produces the
error of type

main.c: 3: warning: conflicting types for built-in function `strlen'

---
#include <stdio.h>

int strlen(char *str);

int main()
{
   exit(0);
}
---

Does it imply that one can't redfine the functions that are part
standard library? Have they become some-kind of reserved symbols?

Also, does any one know if gdb-5.1 has suooprt for 64-bit binaries
produced by a 64-bit gcc-3.0.3 under SPARC? (I did ask it earlier.)

-ishwar