How to #include into .lhs files?

[Conal Elliott]

Thanks, Daniel. I'm still stumped. When I say

#include "B.hs"

in a .hs file, all works fine, but when in a .lhs file I get "error: B.hs:
No such file or directory". The file B.hs is in the same directory as the
including file, which is the current directory for ghci. Same situation with
ghc.

If I change "B.hs" to "./B.hs", I get the same behavior. Only if I use a
fully qualified path name for B.hs does it get found from the .lhs file.

I'm using GHC 6.12.3 on Mac OS 10.6.6.

Any ideas? (Anyone, not just Daniel.)

Thanks,  - Conal


On Thu, Feb 3, 2011 at 2:51 AM, Daniel Fischer <
daniel.is.fischer at googlemail.com> wrote:

> On Thursday 03 February 2011 10:33:23, Conal Elliott wrote:
> > Does anyone have a working example of #include'ing Haskell code into a
> > bird-tracks-style .lhs file with GHC? Every way I try leads to parsing
> > errors. Is there documentation about how it's supposed to work?
> >
> > Help much appreciated.   - Conal
>
> Stupid example:
>
> -- Main:
>
> > {-# LANGUAGE CPP #-}
> > module Main (main) where
>
> #include "MachDeps.h"
>
> > main :: IO ()
> > main = do
>
> #if WORD_SIZE_IN_BITS == 32
>
> >     putStrLn "32 bits"
>
> #include "Stuff32"
>
> # else
>
> >     putStrLn "64 bits"
>
> #include "Stuff64"
> #endif
>
> -- Stuff32:
>
>      putStrLn "Included from Stuff32"
>
> -- Stuff64:
>
>      putStrLn "Included from Stuff64"
>
>
> It's a bit tricky. Since the C preprocessor is run after the unlit, the
> included code should not have bird-tracks, also you have to get the
> indentation right. There's probably a way to run cpp before unlit, which
> would allow you to have bird-tracks in the #include'd code.
>
> Much easier with LaTeX-style literate code.
>
> Cheers,
> Daniel
>
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