Re: [Mingw-users] MinGW + DLL + Virtual member functions + Missing exports

[Greg C. <chi...@mi...>]

> Dinand Vanvelzen wrote:
> 
> I have been trying to get a DLL exporting classes correctly for 5 days now with several friends of mine without any success.
> The DLL is compiled in MinGW and has C functions and C++ classes as exports. The problem is this:
> A number of classes have missing member functions,.. they don't get exported for some reason. One thing we noticed is
> that the problem classes are the ones with virtual member functions. Altough some classes with virtual member functions do
> work. By missing exports i mean that member functions that are not in the .def file but they should be.

It's hard to guess without knowing exactly what you're doing.
A self-contained, minimal test case would be most helpful.

Charles Wilson maintains 'dllhelpers', which gives examples
that might help. Get the latest version you can find, and
be sure it uses '-shared' instead of the deprecated dllwrap.

I specify __declspec(dllexport) and __declspec(dllimport)
explicitly because that seems to be the most robust method.