Building boost-python for pyodide/emscripten

Hello,

I'm working on adding boost-python to the pyodide distribution (https://github.com/pyodide/pyodide-recipes/pull/513), i.e., compile boost-python with emscripten. My bootstrap command is: ./bootstrap.sh --prefix=${INSTALL_DIR} --with-libraries=python --with-python=python$PYMAJOR.$PYMINOR
It seems to detect the Python install in the correct env:

Detecting Python version... 3.13                                                
Detecting Python root... /home/runner/miniconda3/envs/pyodide-env               

The b2 command is a bit more complex, but it works for a lot of other boost libraries:

    ./b2 variant=release toolset=clang-emscripten link=static threading=single --disable-icu \
      cxxflags="$SIDE_MODULE_CXXFLAGS -fwasm-exceptions -DBOOST_SP_DISABLE_THREADS=1" \
      cflags="$SIDE_MODULE_CFLAGS -fwasm-exceptions -DBOOST_SP_DISABLE_THREADS=1" \
      linkflags="-fpic $SIDE_MODULE_LDFLAGS" \
      python=$PYMAJOR.$PYMINOR \
      --layout=system -j"${PYODIDE_JOBS:-3}" --prefix=${INSTALL_DIR} \
      -d2 install

It says:

    - python                   : building                                       

which seems good, but then the only thing it installs are cmake files:

/home/runner/work/pyodide-recipes/pyodide-recipes/packages/.libs                
/home/runner/work/pyodide-recipes/pyodide-recipes/packages/.libs/lib            
/home/runner/work/pyodide-recipes/pyodide-recipes/packages/.libs/lib/cmake      
/home/runner/work/pyodide-recipes/pyodide-recipes/packages/.libs/lib/cmake/Boost
-1.84.0                                                                         
/home/runner/work/pyodide-recipes/pyodide-recipes/packages/.libs/lib/cmake/Boost
-1.84.0/BoostConfigVersion.cmake                                                
/home/runner/work/pyodide-recipes/pyodide-recipes/packages/.libs/lib/cmake/Boost
-1.84.0/BoostConfig.cmake                                                       
/home/runner/work/pyodide-recipes/pyodide-recipes/packages/.libs/lib/cmake/Boost
DetectToolset-1.84.0.cmake                                                      

The libraries I expect, libboost_python and the numpy module, are not installed. I don't think they're compiled at all, but there is no error. Do you have any idea what I am missing?

Thanks,
FX
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