building advice

[d.henman]

I need some advise on how to test certain fixes and not have to rebuild
the whole emacs cvs tree all over...   This is very time consuming to 
try build fixes...

For example, in my case, I am trying to figure out if some changes I made in 
the tramp files, enables them to byte compile properly on my system.

I tried using emacs --batch tramp*.el         [with an existing emacs] and
             temacs --batch tramp*.el         [with the partially built emacs]

I am sure there are various environment variables involved in the process as 
well.
For now I just make changes, distclean, and rebuild.  This takes as you all 
know a long time to find out if I did anything right to at least allow a clean 
compile.

Thanks,
  darel henman