Commenting: - glibc-2.0.x has not __va_copy()

[Franz Sirl <Franz Sirl-kernel lauterbach com>]

Hi Jeff,

this fix is clearly bogus as __va_copy isn't related to glibc, but to the 
compiler (stdarg.h). Back to rev1.1 in GCC CVS this macro is there, this 
suggests it was in gcc-2.8.1/egcs-1.0 or later. It isn't present in 
gcc-2.7.2 or earlier.
I think the right thing to do is to autoconf for array based va_list 
(mozilla has such a beast AFAIR) and then define __va_copy accordingly:

#ifndef __va_copy
#ifdef HAVE_ARRAY_VA_LIST
#define __va_copy(dest, src) *(dest) = *(src)
#else
#define __va_copy(dest, src) (dest) = (src)
#endif
#endif

An even more sophisticated solution would be to test for the official ISO 
C99 va_copy too (don't remember if it has to be a macro or not) if you want 
to support non-gcc compilers.

Franz.