how to avoid building gcc3

[walt]

On Fri, 7 Jan 2005, Jonathon McKitrick wrote:

>
> Building gcc3 takes forever.  Is there a way to avoid it while building world if we are
> not going to use it?

That's the reason that Matt introduced the 'quickworld' target.
It only compiles the code which has changed since the last build,
so it skips not only gcc3 but gcc2 and the rest of the toolchain
as well.

One hint:  if 'quickworld' fails to compile then the next thing
to try is a full buildworld -- but that rarely happens.