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