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Date:      Tue, 28 Aug 2012 17:53:15 +0100
From:      Jamie Paul Griffin <jamie@kode5.net>
To:        David Wolfskill <david@catwhisker.org>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: Building the kernel and userland with llvm/clang
Message-ID:  <20120828165315.GE38854@kontrol.kode5.net>
In-Reply-To: <20120828154621.GJ10869@albert.catwhisker.org>
References:  <20120828153203.GC38854@kontrol.kode5.net> <20120828154621.GJ10869@albert.catwhisker.org>

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[ David Wolfskill wrote on Tue 28.Aug'12 at  8:46:21 -0700 ]

> On Tue, Aug 28, 2012 at 04:32:03PM +0100, Jamie Paul Griffin wrote:
> > Hi
> >=20
> > I've been reading some information about building my system, FreeBSD St=
able/9, using llvm/clang; the site I've been looking at is http://wiki.free=
bsd.org/BuildingFreeBSDWithClang.
> >=20
> > I was wondering about the benefits of doing so and also - and probably =
more importantly - if there are potential problems that might mean it's not=
 worthwhile doing. Having read it again today there doesn't seem to be any =
likely problems
> >=20
> > I'd appreciate any thoughts or advice about this if possible.=20
> > ...
>=20
> I have been doing this (on a daily basis) with both head & stable/9 on
> my home "build machine" and my laptop since 12 Jul 2012; I have seen no
> problems or issues.  (I build my ports under stable/8 & have /usr/local
> in common across all 4 slices on each machine.)
>=20
> Here's what's in my /etc/src.conf for stable/9:
>=20
> CC=3Dclang
> CXX=3Dclang++
> CPP=3Dclang-cpp
> WITH_LIBCPLUSPLUS=3Dyes
>=20
> When I update my "production" machines at home from stable/8 to stable/9
> (probably shortly after 9.1 is released), they will (by necessity) also
> migrate to FreeBSD built with llvm/clang (as they get installed what the
> build machine builds).
>=20
> Peace,
> david

Thanks David, that's helpful information. I'll likely give it a go. So does=
 clang create better binaries and libraries, in terms of performance and su=
ch-like? I'm currently reading as much as I can find about clang and its as=
sociated tools; however, compilers are quite complex software and learning =
about them is, for me at least, a lot to take in.=20

Best wishes, Jamie.

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