difference between BSDs

[Gustavo Vieira Gonçalves Coelho Rios <gustavo_(_dot_)_rios_(_at_)_terra_(_dot_)_com_(_dot_)_br>]

Hi!

I am running OBSD and FBSD, for developing.....
I am curious about the fact that the source program compiled with the
same arguments have different size in OBSD and FBSD, why?

Another problem: Is there any difference in terms of execution time for
the following:

int
a(void)
{
	unsigned	x;

	return x;
}

int (*p)(void) = a;


Which invocation is the fastest : a() or p()?