bootstrapping gnat GCC on amd64

[xorquewasp at googlemail.com]

Hello.

I'm attempting to compile GNAT on AMD64 with an eye to
extending support to the platform (the gnat-gcc43 port
is ONLY_FOR_ARCH=i386).

GNAT obviously requires an Ada compiler to bootstrap.

What are my options here?

I suspect that I need to create an i386 jail to build
a cross compiler but am not sure.

Any help would be appreciated.
xw