Re: Different behaviour of stdarg as function of platform, is this a bug?

[Zack Weinberg <zack at wolery dot cumb dot org>]

On Thu, Jun 08, 2000 at 12:29:21AM +0200, Franz Sirl wrote:
> On Thu, 08 Jun 2000, Zack Weinberg wrote:
> > I think the footnote means you could get the ppc/linux behavior
> > reliably by writing
> >
> > void vfoo(va_list *vl)
> > {
> >   int a, b;
> >   a = va_arg(*vl, int);
> >   b = va_arg(*vl, int);
> >   printf("vfoo: %d %d\n", a, b);
> > }
> >
> > void foo(int x, ...)
> > {
> >   int i;
> >   va_list vl;
> >   va_start(vl, x);
> >   for (i = 0; i < 2; ++i)
> >     vfoo(&vl);
> >   va_end(vl);
> > }
> >
> > but I would not do this in code intended to be portable.
> 
> No, this doesn't change anything :-), va_list is an array in PPC-SYSV ABI, so 
> it will always be passed as a pointer.

Yes, but on other platforms it is passed by value.  On those
platforms, this should get you the same behavior as you get by default
on PPC.

zw