Slow dependency computation

[Dan Ports]

Today I tried doing a `port install texlive +full` on a system with no
ports installed -- and came to regret this, as it spent the better part
of an hour computing dependencies.

I looked through the 140M debug log, and it looks like _mportispresent
is being called over a million times. That's pretty close to the number
of dependencies reported by port rdeps --full.

I see that mportdepends stops searching recursively when it hits a port
that's already installed. Any reason it can't do the same when it hits
an uninstalled dependency it's already seen?

Dan

-- 
Dan R. K. Ports              MIT CSAIL                http://drkp.net/