[Bug c/50581] stdarg doesn't support array types

["Wolfgang at Solfrank dot net" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50581

--- Comment #4 from Wolfgang at Solfrank dot net 2011-10-01 14:43:32 UTC ---
(In reply to comment #3)

Thanks for the insight regarding passing arrays by value in C90, I wasn't even
aware of that.

However:

> Passing va_list as a function argument is generally hard, whether or not 
> variadic, since you don't know whether it will be passed by reference or 
> by value or what the type of the address of a va_list parameter will be.  
> Portable code needs to pass a pointer to va_list or a structure containing 
> va_list or use some other such means of avoiding dependence on whether 
> va_list is an array.

Huh?  What about vprintf and friends?  They are defined to take a va_list as
their last parameter.