Date: Sun, 1 Apr 2012 17:57:31 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: "Conrad J. Sabatier" <conrads@cox.net> 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: <alpine.BSF.2.00.1204011735330.70957@wonkity.com> In-Reply-To: <20120401160653.0a79b997@cox.net> 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>
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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.
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