Two questions about building GHC from sources

[Norman Ramsey]

I've got two questions about building:

 1. If my bootstrap compiler changes (e.g., from 8.10.5 to 9.0.1), is
    Hadrian smart enough to rebuild everything?  If not, how do I
    force it to start over?

 2. At the moment I'm not installing my GHC; I'm using elements
    directly from the build tree.  If I build GHC and then move the
    whole tree to the whole location, will everything be happy?
    Or do I need to do something?  (Again, using Hadrian.)


Norman