Re: Unacceptable result type in FFI

2008/11/17 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

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

Hm, if you don't turn on GeneralizedNewtypeDeriving with GHC, shouldn't it fail earlier on the definition of the newtype that you are deriving things for?

full log here:

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

David Waern wrote:

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2008/11/16 Neal Alexander :

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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

You should not pass --haddock-options to haddock itself. It's used to tell Cabal which options to give to Haddock. So the right line would be:

haddock --optghc=-XGeneralizedNewtypeDeriving

David