Tree flags vs. tree-ssa merge

[Richard Kenner]

    So, you aren't willing to help with merge conflicts?

I am once the merge occurs, but there's no rush in doing this cleanup,
so if it would be simpler to wait until after the merge, it's best to do so:
there's no point in undertaking extra work unnecessarily in doing it twice.

I don't like to have too many source directories around.  The other day RTH
was asking if it was due to disk space limitations and the answer is no: it's
due to "brain space" limitations.  It's just too easy to get confused and
test in one directory and check in from another when there are large numbers
of trees around, at least for me.  I already have three source trees and
at least a half dozen object directories for different targets for each.