Download and build latest llvm, clang and compiler tools.

build-llvm.sh

#!/bin/bash

svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm-latest
cd llvm-latest/tools
svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
cd clang/tools
svn co http://llvm.org/svn/llvm-project/clang-tools-extra/trunk extra
cd ../../../..    #go back to top directory
cd llvm-latest/projects
svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
cd ../..          #go back to top directory
cd llvm-latest
mkdir build
cd build
../configure --enable-optimized --disable-bindings 
make