[CMake] Creating a DLL using .DEF file on MinGW

[Ali Hamdi]

Hello everybody,

I am trying to create a DLL by using a .DEF file and targeting the
MinGW gcc-compiler. In my CMakeLists.txt I have this:

add_library(MyDll SHARED
                MyDll.cpp
                dllmain.cpp
                stdafx.cpp
                MyDll.def).

I have the following sources:

MyDll.def:

LIBRARY	libMyDll
EXPORTS	testfunc

stdafx.cpp:

#include "stdafx.h"

stdafx.h:

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

dllmain.cpp:

#include "stdafx.h"

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}

and finally

MyDll.cpp:

#include "stdafx.h"

__declspec(dllexport) int __stdcall testfunc(int x )
{
	return 1;
}


If I do a regular cmake to create Visual Studio files, everything
compiles and links just fine (within VS Express 2010). But if I use
the CMAKE GUI and explicitly target MinGW, and then use make in the
cmd-prompt then I get the following error:

Creating library file: libMyDll.dll.a
Cannot export testfunc: symbol not defined


Any idea of what I am doing wrong here? I would really appreciate some help.