clang 3.2

compile from source code. Follow the instructions on:
http://clang.llvm.org/get_started.html

Note: the ./configure line is changed to
$ CC=gcc CXX=g++ ../llvm/configure


OR, apt-get install
http://askubuntu.com/questions/261636/how-do-i-backport-install-a-newer-version-of-clang