[gambit-list] C-FFI type issues

Bradley Lucier lucier at math.purdue.edu
Thu Sep 17 00:39:21 EDT 2009

On Thu, 2009-09-17 at 00:02 -0400, Isaac Freeman wrote:
> I've been banging my head on this one for days now... I've even tried
> looking at the resulting C code and passing it through the CPP and
> indent... I can't figure out where this is complaining about and
> why...
> http://paste.lisp.org/display/87211
> Any hints would be great...

I'm no expert on c-lambda, but ...

___result_voidstar is of type (void *) and
((SDL_Surface*)(___arg1_voidstar))->clip_rect is of type struct
SDL_Rect, and these are not assignment compatible; I think you need to
understand (which I don't) this part of the Gambit manual:

        For results of type struct, union, and type, the value assigned
        to the variable ‘___result_voidstar’ must be a pointer to a
        memory allocated block containing a copy of the result.

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