c2ffi handling va_list

[Luís Oliveira]

On Wed, 15 Jul 2020 at 06:16, Madhu <enometh at meer.net> wrote:
> one of the cffi/TODO items has
> -> Handle va_list. For now it's treated as any other argument.
>
> Maybe someone has thought deeply about how to do this?  Please let me
> know if you have any suggestions.
>
> [It seems borodust/claw tries to handle this by converting va_list
> args to variadic lisp arguments - but it still seems to blow up at a
> cffi:parse-type.  Or maybe it is a defect with my Clang-7.0 stdarg
> vs. what is included with gcc]

The TODO item should probably be removed. DEFCFUN has syntax for
varargs and that's implemented on top of FOREIGN-FUNCALL-VARARGS and
FOREIGN-FUNCALL-VARARGS-POINTER. The implementation so far is simple,
it only takes care of promoting floats to doubles, and chars/short to
ints. The test suite tracks whether this works and it seems to work so
far.

Not sure about what c2ffi needs to do, though.

-- 
Luís Oliveira
http://kerno.org/~luis/