"Philip Weaver" <philip.weaver@gmail.com> wrote:

> I'm trying to use CPP-defined strings in a Haskell module, like this:
>    main :: IO ()
>    main = putStrLn FOO
> This of course will not work:
>    ghc -DFOO="hello world" --make Main.hs -o test

Have you tried using ANSI cpp's stringification operator?

   {-# LANGUAGE CPP #-}
   #define STRING(bar) #bar

   main :: IO ()
   main = putStrLn FOO

 ghc -DFOO="STRING(hello world)" --make Main.hs -o test

Regards,
   Malcolm
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