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From: Michael Powell <nightrecon@hotmail.com>
Date: Sat, 11 Feb 2012 16:45:07 -0500
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Subject: Re: Can clang compile RELENG_9?
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Dennis Glatting wrote:

> I get errors when trying to compile RELENG_9 with clang. Is clag suppose
> to work when it comes to compiling the OS or am I missing something:
[snip]

I can't speak to RELENG_9, but I have successfully rebuilt the RELEASE with 
CLANG (make/install world kernel). My /etc/make.conf as per instructions I 
found on the wiki:

.if !defined(CC) || ${CC} == "cc"
CC=clang
.endif
.if !defined(CXX) || ${CXX} == "c++"
CXX=clang++
.endif
.if !defined(CPP) || ${CPP} == "cpp"
CPP=clang-cpp
.endif
# Don't die on warnings
NO_WERROR=
WERROR=
# Don't forget this when using Jails!
NO_FSCHG=

This was with amd64, have not tried any 32 bit. With custom kernel as well.

-Mike