You don't have access to druntime/Phobos stuff at runtime.
SimpleDllMain is for initializing and uninitializing druntime.See: https://github.com/Project-Sidero/basic_memory/blob/main/source/sidero/base/dllmain.d
You want to only use ldc atm. The defaults right now should most likely "just work" in dub for a single compile + link step (i.e. only a single static library in dll).
If you do it manually, you'll want to add the flag ``--fvisibility=public`` to export everything.
