问使用GHC 64位构建的普通Windows DLL不链接

EN

> ghc -shared -O -optc-O -o Grep.dll StartEnd.c Grep.hs

1>main.obj : error LNK2001: unresolved external symbol _HsEnd
1>main.obj : error LNK2001: unresolved external symbol _freegrep
1>main.obj : error LNK2001: unresolved external symbol _grep
1>main.obj : error LNK2001: unresolved external symbol _HsStart
1>C:\Code\Grep\dist\Win32\Release\Grep.exe : fatal error LNK1120: 4 unresolved externals

{-# LANGUAGE ForeignFunctionInterface #-}

module Grep where

import Foreign
import Foreign.C.String
import Data.List (isInfixOf)

filterlines f = unlines . filter f . lines

grep :: CString -> CString -> IO CString
grep i s = do
    ii <- peekCString i
    ss <- peekCString s
    newCString $ (filterlines (isInfixOf ii)) ss

freegrep :: CString -> IO ()
freegrep s = free s

foreign export ccall grep :: CString -> CString -> IO CString
foreign export ccall freegrep :: CString -> IO ()

#include <Rts.h>

void HsStart()
{
   int argc = 1;
   char* argv[] = {"ghcDll", NULL}; // argv must end with NULL

   // Initialize Haskell runtime
   char** args = argv;
   hs_init(&argc, &args);
}

void HsEnd()
{
   hs_exit();
}

#include <HsFFI.h>
#include <Grep_stub.h>
#include <iostream>

extern "C" {
    void HsStart();
    void HsEnd();
}

int main(int argc, char* argv[])
{
    HsStart();
    HsPtr str;

    str = grep("test", "This is a test\nwith many lines\nand it failed\nand the test passed");
    if (str)
    {
        std::cout << (char*) str;
        freegrep(str);
    }

    HsEnd();
    return 0;
}