mkdir xcodellvm
cd xcodellvm
#cmake -DCMAKE_BUILD_TYPE=Debug -G Xcode -DLLVM_JIT=ON -DCMAKE_INSTALL_PREFIX=$HOME/ravi -DLLVM_DIR=$HOME/LLVM/share/llvm/cmake ..
cmake -DCMAKE_BUILD_TYPE=Debug -G Xcode -DLLVM_JIT=ON -DCMAKE_INSTALL_PREFIX=$HOME/ravi -DLLVM_DIR=$HOME/LLVM5/lib/cmake/llvm ..