[Haskell-cafe] GLfloat on a Mac

[Thomas Davie]

On 12 Aug 2008, at 11:11, Conor McBride wrote:

> Hi folks
>
> I thought I'd try a bit of OpenGL. Perhaps I should
> send this to the more specific list, but perhaps
> other people are, like me, trying out a variety of
> UI technology. I thought I'd give OpenGL a go, because
> I saw the name whizz by when I upgraded to 6.8.3. I
> found the tutorial and got copy-paste cracking.
>
> It was all going swimmingly while I did almost nothing,
> but then ghc started dying on me. I chopped down my
> failing code to this joyous specimen:
>
> HelloWorld.lhs contains
>
> ----------------------------------
>
> > module Main where
>
> > import Graphics.Rendering.OpenGL
> > import Graphics.UI.GLUT
>
> > myFloat :: GLfloat
> > myFloat = 0.0
>
> > main = return ()
>
> ----------------------------------
>
> $ ghc -package GLUT HelloWorld.lhs -o HelloWorld
> Illegal instruction
>
> I'm using ghc 6.8.3 on a Mac PowerBook G4. Googling
> "OpenGL illegal instruction" produced an unending
> choice of horror stories.
>
> What message am I not getting? Is there some crucial
> manual I'm not reading? Is there something which we
> should be being told on the relevant wiki page?
>
> Distressed
>
> Conor

I was going to say that this builds and runs fine on my MacPro so it  
could be an endianness issue, but Malcolm's experience seems to  
contradict that.

Bob