writing library in D for Linux and other OSes

[mrkafk]

Hello,

D (complete) newbie here.

Being sick of C/C++ I would like to write my next library in D 
lang. It seems that wrting Win DLL is easy or perhaps workable at 
least (http://dlang.org/dll.html ), but what about other OSes, 
Linux at least? And iOS + OS X?

Specifically, I need to write library usable from Python. There's 
PYD, I know, but in general, if I wanted to call that library 
from other languages using C interface, how well it works in 
practice?

Another issue is GC: can I use D's garbage collection 
(realtime-like performance is not necessary for my needs) in the 
library and it will "just work" in say Python code? Or not?

Thanks!