- Deduce PACKAGES from CXX/B2_COMPILER
- Deduce B2_TOOLSET from B2_COMPILER
- Write the correct user-config.jam in common_install.sh
- Print compiler location and version in common_install.sh
> In file included from ./boost/boost-ci/boost_ci.hpp:11:
> /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/memory:200:16: error: no member named 'is_constant_evaluated' in namespace 'std'
> if (std::is_constant_evaluated())
> ~~~~~^