help with type-punned warning please

From: David Ford (david+challenge-response_at_blue-labs.org)
Date: 02/26/04

Date: Wed, 25 Feb 2004 23:59:48 -0500
To: "David Ford" <david+challenge-response@blue-labs.org>

I have a macro that I use across the board for freeing ram. I'd like to
clean up my code so I don't get these warnings.

#define sfree(x) _internal_sfree((void **)&x)
#define _internal_sfree(x) ({ if(x && *x) { free(*x); *x=NULL; } })

void somefunction() {

char *x = malloc(10);
int *y = malloc(10);

sfree(x);
sfree(y);
}

results in:

warning: dereferencing type-punned pointer will break strict-aliasing
rules

What's the best way of fixing my lack of clue?

Thank you,
David

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