build clang++-libc++ from git on Ubuntu

export CC=clang
export CXX=clang++
export CXXFLAGS="-stldib=libc++"
cd
export CPLUS_INCLUDE_PATH="$CPLUS_INCLUDE_PATH:/home/user/llvm/projects/libcxxabi/include"
export LDFLAGS="-lc++abi"

cd
git clone --single-branch --branch master --depth=1 http://llvm.org/git/llvm
cd llvm/projects/
git clone --single-branch --branch master --depth=1 http://llvm.org/git/libcxxabi
git clone --single-branch --branch master --depth=1 http://llvm.org/git/libcxx
git clone --single-branch --branch master --depth=1 http://llvm.org/git/compiler-rt
cd ../tools
git clone --single-branch --branch master --depth=1 http://llvm.org/git/clang
git clone --single-branch --branch master --depth=1 http://llvm.org/git/clang-tools-extra extra
git clone --single-branch --branch master --depth=1 http://llvm.org/git/lld
git clone --single-branch --branch master --depth=1 http://llvm.org/git/lldb
git clone --single-branch --branch master --depth=1 http://llvm.org/git/polly

sudo apt-get install libgmp3-dev dh-autoreconf libunwind8 libunwind8-dev

cd
cd llvm/tools/polly/utils
mkdir -p ~/build-cloog
bash checkout_cloog.sh ~/build-cloog
mkdir -p ~/build-isl
bash checkout_isl.sh ~/build-isl
cd ~/build-isl/
./configure
make
sudo make install
cd ~/build-cloog/
./configure --with-isl=system
make
sudo make install

sudo apt-get install python-dev libedit-dev libncurses-dev swig libgmp-dev

cd
mkdir build-llvm
cd build-llvm
#  --enable-debug-runtime
bash ../llvm/configure --enable-optimized --disable-assertions --enable-libcpp --enable-jit --with-intel-jitevents --enable-targets=x86,x86_64 --enable-polly --enable-cxx1y --with-gmp=/usr/local --with-isl=/usr/local --with-cloog=/usr/local --with-binutils-include=/usr/include
make -j5
#mv /usr/local/clang /usr/local/clang1
sudo make install

sudo apt-get install cmake
cd
mkdir build-profile-rt
cd build-profile-rt
cmake ../llvm/projects/compiler-rt -DLLVM_CONFIG_PATH=/usr/local/bin/llvm-config
make
sudo make install

#cd
#git clone --single-branch --branch master --depth=1 http://llvm.org/git/libclc
#cd libclc
#./configure.py --with-llvm-config=/usr/local/bin/llvm-config

#clang++ -O3 -Xclang -load -Xclang LLVMPolly.so -mllvm -polly -mllvm -polly-vectorizer=polly -mllvm -enable-polly-openmp -lgomp file.cpp