gnat-gcc Ada GNAT on 10.6 Snow Leopard

[Jerry]

Is there a GNAT (Ada) compiler that is known to work with Snow  
Leopard, OS X 10.6?

If so, what version(s) of Xcode works with it?

I'm on the macada.org list and will gladly report any discussion there  
back to that list.

I recall that someone, not too long ago, managed to bootstrap GNAT  
into Macports. I'm just wondering if that effort has succeeded with  
Snow Leopard.

Jerry