Shared library module system with dub

[Pillager86]

What is the correct multi-platform way to build one dub project 
as a shared library, and load said shared library in a separate 
dub project? So far I am able to load a shared library and run a 
function from it (had to extern(C) it to get the symbol to load) 
by using "targetType":"dynamicLibrary" in the shared library 
project, but the main program exits with code -11 and if I don't 
unload the library manually I get a weird "Aborting from 
src/rt/sections_elf_shared.d(500) DSO being unregistered isn't 
current last one.Program exited with code -6" error that Google 
knows nothing about.

I'm trying to add a module system to DMildew because the core 
runtime is over 50 MB in the debug build. Libraries would be 
written in regular D and optionally dynamically loaded by a 
regular D application that links to the core static library (the 
DMildew runtime).