py312-setuptools build fails if any installed setuptools plugin fails to import

[MStraeten (Martin Straeten)]

:info:build ERROR Backend subprocess exited when trying to invoke build_wheel
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_ma
cports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-setu
ptools/py312-setuptools/work/setuptools-70.0.0" && /opt/local/Library/Frameworks
/Python.framework/Versions/3.12/bin/python3.12 -m build --no-isolation --wheel -
-outdir /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macp
orts.org_macports_release_tarballs_ports_python_py-setuptools/py312-setuptools/w
ork --skip-dependency-check
:info:build Exit code: 1

[jmroot (Joshua Root)]

:info:build   File "/opt/local/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/py2app/recipes/matplotlib.py", line 5, in <module>
:info:build     from pkg_resources import packaging
:info:build ImportError: cannot import name 'packaging' from 'pkg_resources' (/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-setuptools/py312-setuptools/work/setuptools-70.0.0/pkg_resources/__init__.py)

I guess it's scanning all installed packages for some reason, and fails if any one of them fails to import, which the outdated version of py2app does. If you can't just use the prebuilt archive for some reason, try deactivating py312-py2app before upgrading setuptools?

[MStraeten (Martin Straeten)]

thanks, that works

[jmroot (Joshua Root)]

I guess this is a variation of this long-standing upstream setuptools bug: ​https://github.com/pypa/setuptools/issues/617

[jmroot (Joshua Root)]

Actually it looks like this is the specific upstream issue for this one: ​https://github.com/pypa/setuptools/issues/4417