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ghci doesn't work with FFI export declarations?
#include <stdio.h>
void callMeFromC(void);
void callMeFromHaskell(void)
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ForeignFunctionInterface #-}
module Main where
import qualified Data.ByteString.Char8 as B
foreign import ccall "callMeFromHaskell"
callMeFromHaskell :: IO ()
foreign export ccall callMeFromC :: IO ()
callMeFromC :: IO ()
callMeFromC = B.putStrLn "callMeFromC"
main :: IO ()
main = do
B.putStrLn "main"
return ()
GHC_OPT := -Wall -O2 -fno-warn-unused-do-bind
all: ffiso
test: ffiso
ffiso: FFISo.hs c.c
ghc --make $(GHC_OPT) $^ -o $@
rm -rf *.hi *.o ffiso *_stub.*
ghci0: ffiso
echo main | ghci FFISo.hs
ghci1: ffiso
echo main | ghci FFISo.hs c.o
ghci2: ffiso
echo main | ghci FFISo.hs c.o FFISo.o

Unfortunately only with -fobject-code which also disables debugging.

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