Date: Tue, 3 Apr 2012 19:37:00 -0500 From: "Conrad J. Sabatier" <conrads@cox.net> To: Warren Block <wblock@wonkity.com> Cc: Robert Huff <roberthuff@rcn.com>, FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: using clang (was: Re: ps, clang and make variables) Message-ID: <20120403193700.3d8efa26@cox.net> In-Reply-To: <alpine.BSF.2.00.1204011735330.70957@wonkity.com> References: <4F76DD24.4060104@herveybayaustralia.com.au> <20120331135624.GA46283@ozzmosis.com> <20343.7837.796535.407848@jerusalem.litteratus.org> <20120401073525.1c05bc0f@cox.net> <20344.21184.853321.579064@jerusalem.litteratus.org> <20120401130201.272897fc@cox.net> <alpine.BSF.2.00.1204011223440.69728@wonkity.com> <20120401141129.1f94e50e@cox.net> <20120401160653.0a79b997@cox.net> <alpine.BSF.2.00.1204011735330.70957@wonkity.com>
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On Sun, 1 Apr 2012 17:57:31 -0600 (MDT) Warren Block <wblock@wonkity.com> wrote: > On Sun, 1 Apr 2012, Conrad J. Sabatier wrote: > > > On Sun, 1 Apr 2012 14:11:29 -0500 > > "Conrad J. Sabatier" <conrads@cox.net> wrote: > > > >> On Sun, 1 Apr 2012 12:29:45 -0600 (MDT) > >> Warren Block <wblock@wonkity.com> wrote: > >>> > >>> Have you tried clang with ccache? Any tricks? > >> > >> No, I haven't tried that. Actually, I don't believe I've ever even > >> tried using ccache at all (at least, not that I can recall). :-) > >> > > > > You've piqued my curiosity here. :-) > > > > I'm doing a buildworld at the moment using ccache with clang. So > > far, all is well, no problems. Didn't do anything special to get > > started, just "ccache make -DNO_CLEAN -j8 buildworld" (I have all > > that clang-enabling stuff already in /etc/make.conf). I know this > > first run won't really show me much, other than that it *will* > > compile OK. Subsequent runs should be interesting, though. :-) > > A few tests earlier today showed that with everything in cache, it > took about 1.5 to 2 times as long to build with clang versus gcc > 4.2.1. It was faster with a full cache than without, of course: > clang took 38 minutes with nothing in cache, about 12 minutes with > everything cached, and gcc buildworlds have been as fast as six > minutes. A gcc all-cached test I just tried was 7:47. > > For some reason, buildworlds on this Core I5 are much faster when > running powerd -a hadp than without. And somewhat variable. Well, unfortunately, I'm unable to do a successful buildworld at the moment, with or without ccache, so the results are still up in the air on that. :-) Will keep trying, though. I *hate* when this happens! :-) -- Conrad J. Sabatier conrads@cox.net
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