On Sun, 1 Apr 2012, Conrad J. Sabatier wrote:
On Sun, 1 Apr 2012 14:11:29 -0500
"Conrad J. Sabatier" <[email protected]> wrote:
On Sun, 1 Apr 2012 12:29:45 -0600 (MDT)
Warren Block <[email protected]> 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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