On Thu, 23 Jan 2014, Kevin Oberman wrote:

On Thu, Jan 23, 2014 at 7:47 AM, Thomas Hoffmann <trh...@gmail.com> wrote:
      On Thu, Jan 23, 2014 at 9:56 AM, Warren Block <wbl...@wonkity.com> wrote:
      > Using -DNOCLEAN with an existing /usr/obj can go even faster than 
      > less than two minutes for a buildworld on my frequently updated i5/SSD
      > system, sometimes less than one minute.

Can you elaborate on this, please? I always clear my /usr/obj before
starting a buildworld, which takes 2 hours to run on my system. Are you
saying if I do "make -DNOCLEAN buildworld" I do not have to clear /usr/obj

Yes.  Removing /usr/obj is a faster way of doing 'make clean', mostly.

AND my buildworld will run faster

Yes, because make will see that many/most files have already been built.

(AND with no downside)?

Well... mostly.  :)

I noticed that after 10.0-RELEASE, uname on my system still said "PRERELEASE". That code had not been rebuilt because make did not see it as needing a rebuild. You can still delete /usr/obj and run a full buildworld from scratch every so often.

I should give credit to bdrewery@ for reminding me about -DNOCLEAN when I was whining about ccache not working on 10.0. It turned out to be a better solution.
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