On Sat, Sep 30, 2000 at 10:51:49PM +0200, Richard Zidlicky wrote: > ((ap) = (va_list)&formatstr + ((sizeof(formatstr)+sizeof(int)\ > -(size_t)1) & ~(sizeof(int) -(size_t)1))); If you got this from the expansion of va_start, then you're looking at the wrong headers. This should instead expand to __builtin_stdarg_start ((ap), formatstr); r~