Re: __builtin_return_address()

["H . J . Lu" <hjl at lucon dot org>]

On Sun, Jul 22, 2001 at 07:09:30PM +0200, Falk Hueffner wrote:
> Hi,
> 
> I have a problem with __builtin_return_address(). This program:
> 
> int main() {
>     printf("%p\n", __builtin_return_address(0));
>     printf("%p\n", __builtin_return_address(1));
>     printf("%p\n", __builtin_return_address(2));
> }
> 
> yields on alpha:
> 
> 0x2000006a5ec
> (nil)
> (nil)
> 
> which is consistent with the info page which says
> 
>      On some machines it may be impossible to determine the return
>      address of any function other than the current one; in such cases,
>      or when the top of the stack has been reached, this function will
>      return `0'.
> 
> On a i386, though, I get:
> 
> 0x4003638b
> 0x804838d
> zsh: segmentation fault (core dumped)  ./a.out
> 
> Is this a bug in gcc, or is this simply unavoidable on i386? If so,
> the info page should mention it.
> 

See

http://gcc.gnu.org/ml/gcc-bugs/2001-06/msg00099.html


H.J.