https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14557
--- Comment #21 from felix <felix.von.s at posteo dot de> --- > va_list ap2; > va_copy(ap2, ap); > and then use &ap2, this always works. > the proposed macros are both broken and unnecessary. That's not equivalent. Using va_arg(ap2, T) does not propagate state changes back to ap, which is the main motivation to form a pointer to ap in the first place. The macros do that just fine. You mean they are unportable? That part is true, I admitted as much. Pick your poison. As for being unnecessary, I vaguely remember gnulib trying to use internal helper functions with va_list * parameter in their vfprintf implementation. I cannot find the link now, unfortunately. But there are also duplicates to this very report, so clearly the need is there.
