[MacPorts] #69534: py39-setuptools @69.2.0: AttributeError: module 'importlib_metadata' has no attribute 'MetadataPathFinder'

[MacPorts]

#69534: py39-setuptools @69.2.0: AttributeError: module 'importlib_metadata' has no
attribute 'MetadataPathFinder'
------------------------+-----------------------------
 Reporter:  ryandesign  |      Owner:  jmroot
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.9.1
 Keywords:              |       Port:  py39-setuptools
------------------------+-----------------------------
 py310-libxml2 and later build fine but py39-libxml2 and earlier are
 failing to build:

 {{{
 DEBUG: system:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_python_py-
 libxml2/py39-libxml2/work/libxml2-2.12.5/python" &&
 /opt/local/Library/Frameworks/Python.framework/Versions/3.9/bin/python3.9
 setup.py --no-user-cfg build -j8
 Traceback (most recent call last):
   File
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_python_py-
 libxml2/py39-libxml2/work/libxml2-2.12.5/python/setup.py", line 8, in
 <module>
     from setuptools import setup, Extension
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9
 /site-packages/setuptools/__init__.py", line 14, in <module>
     from . import version as _version_module
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9
 /site-packages/setuptools/version.py", line 1, in <module>
     from ._importlib import metadata
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9
 /site-packages/setuptools/_importlib.py", line 43, in <module>
     disable_importlib_metadata_finder(metadata)
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9
 /site-packages/setuptools/_importlib.py", line 31, in
 disable_importlib_metadata_finder
     to_remove = [
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9
 /site-packages/setuptools/_importlib.py", line 34, in <listcomp>
     if isinstance(ob, importlib_metadata.MetadataPathFinder)
 AttributeError: module 'importlib_metadata' has no attribute
 'MetadataPathFinder'
 }}}

 All that py-libxml2 is trying to is use its setup.py file. This
 `importlib_metadata` requirement is not mentioned anywhere in libxml2, so
 I think this is a py-setuptools bug?

-- 
Ticket URL: <https://trac.macports.org/ticket/69534>
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