Re: Linking with C++ produced by Visual Studio .NET on Windows XP?

24 Jan 2006

      Cyril Schmidt wrote:
...
Brian Hulley wrote:
...
Thanks. The only problem is that dlltool doesn't work because I don't
have
cygwin installed.
dlltool usually comes with the Windows distribution of GHC (at least
GHC 6.4 and 6.4.1 have it; check gcc-lib directory).
Thanks - I wonder why they didn't put all the binaries in the bin directory?
Anyway, I've added gcc-lib to my path and deleted the version of dlltool.exe 
that I downloaded, but for some reason it won't link. I used the following 
commands (as per your post):

C++ file adapted from default generated by VS DLL project:

TestDLL.cpp:

// TestDLL.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
      )
{
    return TRUE;
}

int __stdcall cfun(int x){
 return x * 3;
}

I built this with VS, then wrote a def file:

TestDLL.def:

LIBRARY TestDLL
EXPORTS
cfun

Then I generated the lib using:

dlltool -d TestDLL.def -l libTestDLL.a

Then I wrote a Haskell program Main.hs:

module Main where

import GHC.Exts

foreign import ccall cfun :: Int# -> Int#

main = do
       let a = cfun 10#
       putStrLn $ show $ I# a

and compiled with

ghc -fglasgow-exts --make Main.hs -optl-lTestDLL -optl-L

but I now get an error message:

Linking ...
c:\ghc\ghc-6.4\gcc-lib\ld.exe: cannot find -lTestDLL

Any ideas?

Thanks, Brian.