Unacceptable result type in FFI

[Neal Alexander]

Graphics/Rendering/OGL/GL/FlushFinish.hs:39:0:
     Unacceptable result type in foreign declaration: GL ()
     When checking declaration:
         foreign import ccall unsafe "static  &glFlush" flush :: GL ()

Graphics/Rendering/OGL/GL/FlushFinish.hs:47:0:
     Unacceptable result type in foreign declaration: GL ()
     When checking declaration:
         foreign import ccall unsafe "static  &glFinish" finish :: GL ()
haddock: Failed to check module: Graphics.Rendering.OGL.GL.FlushFinish

-------------

The error message is the same as what GHC would give without 
-XGeneralizedNewtypeDeriving.



full log here:

http://hackage.haskell.org/packages/archive/OGL/0.0.0/logs/failure/ghc-6.10


David Waern wrote:
> 2008/11/16 Neal Alexander <wqeqweuqy at hotmail.com>:
>> How do you get Haddock 2.4 to handle the return type of an FFI function that
>> isnt "IO". It works automatically in the haddock version that ships with ghc
>> 6.8.1.
>>
>> I tried:
>>
>> haddock --haddock-options=--optghc=-XGeneralizedNewtypeDe
>> riving
> 
> I don't see why this would be a problem. What kind of error message do you get?
> 
> I can't test myself right now since I'm at work.
> 
> Thanks,
> David