peter at wemm.org
Thu Apr 22 10:24:55 PDT 2004
On Thursday 22 April 2004 01:24 am, Valentin Nechayev wrote:
> Wed, Apr 21, 2004 at 22:58:01, peter wrote about "Re: va_list q":
> > amd64 needs to use the same code that is in the #ifdef __powerpc__.
> > Its what we use in src/usr.sbin/pppd FWIW.
> Thanks, I couldn't find vfmtmsg() and thought it was introduced
> > On powerpc and amd64, the argument passing ABI is so complicated
> > that the sequence counters can't be fit in the spare bits in a
> > pointer like on the other platforms. So on those two (and some
> > other) platforms, gcc implements va_list as a pointer to an
> > external structure.
> > As an aside, this breaks code that assums it can copy va_lists by
> > assignment. On powerpc and amd64, you *must* use va_copy(), or you
> > simply copy the pointer, not the actual argument passing state.
> I'll copy hack from system sources. But is it better to use
You can't use va_copy here. The problem is what type do you give to
va_arg() to pull a va_list off a va_list. gcc is inconsistent with
But if this was copying args, you'd have to use va_copy. But it
Peter Wemm - peter at wemm.org; peter at FreeBSD.org; peter at yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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