shared libs for OSX

[Martin Nowak via Digitalmars-d]

On Tuesday, 26 May 2015 at 16:25:52 UTC, bitwise wrote:
> Since all global functions and symbols are shared between 
> images anyways, receiving the callback in the main image would 
> be fine. So in this case, unregistering the callbacks is no 
> longer needed.

That only works when the host executable is linked against 
druntime, but falls when you load runtime dynamically, e.g. a D 
plugin for a C host.