qsort() ptrdiff_t may be larger than int

Morten Welinder <mwelinder@gmail.com> writes:

> The code looks wrong.  It assumes that pointers are no larger than ints.
> If pointers are larger than ints, the code does not necessarily compute
> a consistent ordering and qsort is allowed to do whatever it wants.
>
> Morten
>
> static int compare_object_pointers(const void *a, const void *b)
> {
> 	const struct object * const *pa = a;
> 	const struct object * const *pb = b;
> 	return *pa - *pb;
> }

Signed-off-by: Junio C Hamano <junkio@cox.net>

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