eagletmt · October 28, 2009 08:23
diff --git a/Bar.hs b/Bar.hs
 module Bar where
 myReverse [] = []
 myReverse (x:xs) = myReverse xs ++ [x]
diff --git a/Foo.hs b/Foo.hs
 module Foo where
 myReverse = foldl (flip (:)) []
diff --git a/Hoge.cabal b/Hoge.cabal
 Name: Hoge
 Version: 0.0.0
 License: BSD3
 Cabal-Version: >= 1.2
 Build-Type: Simple

 Executable foo
  Main-is: Main.hs
  Build-Depends: base
  CPP-Options: "-DUSE_FOO"

 Executable bar
  Main-is: Main.hs
  Build-Depends: base
  CPP-Options: "-DUSE_BAR"
diff --git a/Main.hs b/Main.hs
 {-# LANGUAGE CPP #-}
 module Main where

 #if defined(USE_FOO)
 import Foo
 #elif defined(USE_BAR)
 import Bar
 #endif

 main = print $ myReverse [1..10]