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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 31 Mar 2006 08:30:01 -0500
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Subject: Re: Deleting Kernel conpile directory
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"Nikolas Britton" <nikolas.britton@gmail.com> writes:

> On 30 Mar 2006 09:40:03 -0500, Lowell Gilbert
> <freebsd-questions-local@be-well.ilk.org> wrote:
> > "Grant Peel" <gpeel@thenetnow.com> writes:
> >
> > > I am running a little low on disk space in /usr
> > >
> > > Can I delete the /usr/src/sys/i386/compile/mykernel directory?
> >
> > Sure.  And if you use the "buildkernel" method when you build kernels,
> > you won't even need that directory again.  If you use the "old
> > method," (calling config directly), though, you will need the space
> > again.
> >
> > > If so, which method is best:
> > >
> > > a:
> > > cd /usr/src/sys/i386/compile
> > > rm -rf mykernel
> > >
> > > or
> > >
> > > b:
> > > cd /usr/src/sys/i386/compile/mykernel
> > > make clean
> >
> > Either one is fine.  If you never want to use the directory again, go
> > ahead and use the first one.
> 
> What happens when you run 'make clean' from /usr/src/? I tried it once
> and it deleted a lot of tmp and .gz files, I thought all of that stuff
> was stored in /usr/obj/. always... to the OP you can also delete every
> thing in /usr/obj/

The only problem with that is that you *know* you will need that space
again next time you do a source update.