Building gcc 3.4.2 with Ada language on FreeBSD

[Tommy Zhu]

There is just gnat 3.15 ada compiler in ports currently. So it need to
build it DIY  for one who want GNAT 3.4.2 on FreeBSD. The reason of that
is GNAT 3.4.2 has "a lot of nice new features". :)
http://www.ada.krischik.com/gnat-3_4_2.html 

So, Firstly, to download GCC with ada packages, to install gnat3.15 from
ports.   <b>USING ADAGCC</b> as the host compiler, Adagcc is including
in gnat3.15p, and then just following the INSTALL/build.html to build
your GNAT 3.4.2 on FreeBSD. and then you can use the new ada compiler on
Freebsd to recompiler your second version ada compiler if you like. :-)

Because the configure script of gcc3.4.2 can't detect any ada compiler
(gnat3.15) on BSD, that's why it need to use adagcc as the host compile.
I think the best way is to change the configure script.

cheers.
-- 
Tommy Zhu <tommy at cnluton.com>