A swig dev said:

> Wrapping a function taking va_list isn't currently possible with SWIG -
> see:
>
> http://www.swig.org/Doc1.3/Varargs.html#Varargs_nn8
>
> I think the text there is a bit pessimistic though - I think we should be
> able to automatically generate a C/C++ function with varargs (i.e. ... in
> the prototype) in place of the va_list which just sets up a va_list and
> then calls the va_list function.  Then we can wrap the automatically
> generated function instead.  But we don't currently do that (and I don't
> have plans to work on it myself in the foreseeable future).
>
> For now at least, you should be able to use %extend to write such a
> wrapper for yourself (and wrap it as the manual explains), and then use
> %ignore to ignore the va_list version.
>
> Or if the API being wrapped already has a "..." equivalent, just %ignore
> the va_list variant.

It appears to me that the last option is the best alternative for csoundac 
(given that the problematic function is already exported as a "..." 
overload). And indeed, adding 

%ignore Counterpoint::message(const char*, va_list);

at the beggining of CsoundAC.i makes the compilation work, while apparently 
preserving the other message function.


-- 
Felipe Sateler