Excellent, thanks for the report. Btw, were you compiling natively on the pi or were you using a crosscompiler? Thanks!
Native on the pi.
$ clang -v
Debian clang version 3.0-6.2 (tags/RELEASE_30/final) (based on LLVM 3.0)
Target: arm-unknown-linux-gnueabihf
Thread model: posix
I read something about changes in the arm processors which is why the CFLAGS with explicit CPU version are needed.