[Haskell-cafe] Re: cant get trivial c2hs to work

[Anatoly Yakovenko]

doh, i was just missing "where" after module... in my .chs file, and
some other syntax errors...

On 9/30/06, Anatoly Yakovenko <aeyakovenko at gmail.com> wrote:
> I am trying to figure out how to use c2hs, so I wrote a wrapper for
> asin from math.h:
> $ cat ASin.chs
> module MySin (mysin)
>
> import C2HS
>
> #include "math.h"
>
> asin::Double -> Double
> asin xx =
>    {#call fun asin#} xx
>
> and this is my main:
> $ cat Main.hs
> module Main where
>
> import ASin
>
> main = do
>    putStrLn $ show $ asin 0.5
>
> `c2hs ASin.chs` generates this:
>
> $ cat ASin.hs
> -- GENERATED by C->Haskell Compiler, version 0.14.5 Travelling
> Lightly, 12 Dec 2005 (Haskell)
> -- Edit the ORIGNAL .chs file instead!
>
>
> {-# LINE 1 "ASin.chs" #-}module MySin (mysin)
>
> import C2HS
>
>
> asin::Double -> Double
> asin xx =
>    asin xx
>
>
>
> foreign import ccall safe "ASin.h asin"
>   asin :: (CDouble -> CDouble)
>
>
> but, when i try to build the wone thing, i get an error that i dont understand:
>
> $ ghc -v --make -fffi Main.hs
> Glasgow Haskell Compiler, Version 6.4.2, for Haskell 98, compiled by
> GHC version 6.4.2
> Using package config file: /usr/lib/ghc-6.4.2/package.conf
> Hsc static flags: -static
> *** Chasing dependencies:
> Chasing modules from: Main.hs
> *** Deleting temp files
> Deleting:
>
> ASin.chs:2:0: parse error on input `import'
>
>
> So, what am i missing?
>