Script to build Boost C++ libraries for python2 and python3

build_boost_for_python2_and_python3.sh

BOOST_VERSION=1.67.0
BOOST_TOOLSET="clang-5.0"
BOOST_CFLAGS="-fPIC -std=c++14 -DBOOST_ERROR_CODE_HEADER_ONLY"
BOOST_BASENAME="boost-${BOOST_VERSION}"
BOOST_INCLUDE=${PWD}/${BOOST_BASENAME}-install/include
BOOST_LIBPATH=${PWD}/${BOOST_BASENAME}-install/lib

echo "Downloading boost."
wget "https://dl.bintray.com/boostorg/release/${BOOST_VERSION}/source/boost_${BOOST_VERSION//./_}.tar.gz"
echo "Extracting boost."
tar -xzf ${BOOST_BASENAME//[-.]/_}.tar.gz
mkdir -p ${BOOST_BASENAME}-install/include
mv ${BOOST_BASENAME//[-.]/_} ${BOOST_BASENAME}-source
pushd ${BOOST_BASENAME}-source >/dev/null

echo "Building boost for python2"
py2="/usr/bin/env python2"
py2_root=`${py2} -c "import sys; print(sys.prefix)"`
pyv=`$py2 -c "import sys;x='{v[0]}.{v[1]}'.format(v=list(sys.version_info[:2]));sys.stdout.write(x)";`
./bootstrap.sh \
  --with-toolset=clang \
  --prefix=../boost-install \
  --with-libraries=python,filesystem \
  --with-python=${py2} --with-python-root=${py2_root}
echo "using python version: ${pyv}"
echo "using python : ${pyv} : ${py2_root}/bin/python2 ;" > ${HOME}/user-config.jam
./b2 toolset="${BOOST_TOOLSET}" cxxflags="${BOOST_CFLAGS}" --prefix="../${BOOST_BASENAME}-install" -j ${CARLA_BUILD_CONCURRENCY} stage release
./b2 toolset="${BOOST_TOOLSET}" cxxflags="${BOOST_CFLAGS}" --prefix="../${BOOST_BASENAME}-install" -j ${CARLA_BUILD_CONCURRENCY} install
./b2 toolset="${BOOST_TOOLSET}" cxxflags="${BOOST_CFLAGS}" --prefix="../${BOOST_BASENAME}-install" -j ${CARLA_BUILD_CONCURRENCY} --clean-all

# Get rid of  python2 build artifacts completely & do a clean build for python3
echo "Cleaning up boost python2 build artifacts"
popd >/dev/null
rm -Rf ${BOOST_BASENAME}-source
tar -xzf ${BOOST_BASENAME//[-.]/_}.tar.gz
mkdir -p ${BOOST_BASENAME}-install/include
mv ${BOOST_BASENAME//[-.]/_} ${BOOST_BASENAME}-source
pushd ${BOOST_BASENAME}-source >/dev/null

echo "Building python3 boost"
py3="/usr/bin/env python3"
py3_root=`${py3} -c "import sys; print(sys.prefix)"`
pyv=`$py3 -c "import sys;x='{v[0]}.{v[1]}'.format(v=list(sys.version_info[:2]));sys.stdout.write(x)";`
./bootstrap.sh \
  --with-toolset=clang \
  --prefix=../boost-install \
  --with-libraries=python \
  --with-python=${py3} --with-python-root=${py3_root}
echo "using python version: ${pyv}"
echo "using python : ${pyv} : ${py3_root}/bin/python3 ;" > ${HOME}/user-config.jam
./b2 toolset="${BOOST_TOOLSET}" cxxflags="${BOOST_CFLAGS}" --prefix="../${BOOST_BASENAME}-install" -j ${CARLA_BUILD_CONCURRENCY} stage release
./b2 toolset="${BOOST_TOOLSET}" cxxflags="${BOOST_CFLAGS}" --prefix="../${BOOST_BASENAME}-install" -j ${CARLA_BUILD_CONCURRENCY} install

popd >/dev/null
rm -Rf ${BOOST_BASENAME}-source
rm ${BOOST_BASENAME//[-.]/_}.tar.gz