Nothing. In other words, this:
__declspec(dllexport) BOOL WINAPI DllMain (HINSTANCE hInst, DWORD Reason, LPVOID Reserved)
{
switch (Reason)
{
case DLL_PROCESS_ATTACH:
break;
case DLL_PROCESS_DETACH:
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
}
return TRUE;
}
Of course, whatever pre-processing you do will dictate what hoops you need to jump through.