I have installed clang via yum:
yum install clang
Unfortunately, even a simple "Hello World!" won't compile because it tries to use the headers of libstdc++4.6 (which I think have c++0x features that clang does not understand). I could not find a libstdc++4.5 package, only for F14 which obviously didn't install.
I even tried installing the 2.9 binaries and also compiled&installed the svn trunk for myself. None of this helped.
I recall having the same problem on ubuntu, but I was able to solve it there by installing libstdc++4.5 headers.
So, how do people use clang on Fedora?