shared libraries on OS X

[Martin Nowak via Digitalmars-d]

On 11/11/2014 06:24 PM, Jacob Carlborg wrote:
> BTW, the reason to implement native TLS is because otherwise we need to
> implement basically what the dynamic linker is already doing for TLS our
> self. Since it would be nice to have native TLS support anyway I thought
> that was a better idea.

What's the situation of native TLS? Any docs?
What version of OSX is required?