TEMPORARY: debug pip CI errors

.github/workflows/main.yml

@@ -492,7 +492,7 @@ jobs:
           architecture: x64
       - name: Install Python dependencies
         run: |
-          python -m pip install -U pip 'setuptools>=43.0.0' wheel
+          python -m pip install -U pip 'setuptools<61.0' wheel
           python -m pip install scons pypiwin32 numpy ruamel.yaml cython h5py pandas pytest pytest-github-actions-annotate-failures
       - name: Restore Boost cache
         uses: actions/cache@v2
@@ -516,6 +516,13 @@ jobs:
           python_package=full env_vars=PYTHONPATH,GITHUB_ACTIONS
           msvc_version=${{ matrix.vs-toolset }} f90_interface=n --debug=time
         shell: cmd
+      - name: Store pip debug log
+        if: always()
+        uses: actions/upload-artifact@v2
+        with:
+          path: pip-debug.log
+          name: pip-debug-vc${{ matrix.vs-toolset }}-py${{ matrix.python-version }}.log
+          retention-days: 2
       - name: Test Cantera
         run: scons test show_long_tests=yes verbose_tests=yes --debug=time
 

interfaces/cython/SConscript

@@ -62,6 +62,7 @@ if (
     and module_ext == ".pyd"
 ):
     module_ext = f".cp{py_version_nodot}-{info['plat'].replace('-', '_')}.pyd"
+print(f"DEBUG: Python module_ext = '{module_ext!r}'")
 
 # Don't print deprecation warnings for internal Python changes.
 # Only applies to Python 3.8. The field that is deprecated in Python 3.8
@@ -102,7 +103,7 @@ ext = localenv.LoadableModule(f"cantera/_cantera{module_ext}",
                               obj, LIBPREFIX="", SHLIBSUFFIX=module_ext,
                               SHLIBPREFIX="", LIBSUFFIXES=[module_ext])
 
-build_cmd = ("$python_cmd_esc -m pip wheel --no-build-isolation --no-deps "
+build_cmd = ("$python_cmd_esc -m pip wheel -vvv --log pip-debug.log --no-build-isolation --no-deps "
              "--wheel-dir=build/python/dist build/python")
 plat = info['plat'].replace('-', '_').replace('.', '_')
 wheel_name = (f"Cantera-{env['cantera_version']}-cp{py_version_nodot}"

interfaces/cython/setup.cfg.in

@@ -57,7 +57,7 @@ cantera.examples = */*.*
 # The module extension needs to be here since we don't want setuptools to
 # compile the extension, so there are no `source` files in
 # the setup.py extension.
-cantera = *.pxd, *@module_ext@
+cantera = _cantera.pxd, _cantera*@module_ext@
 
 [options.extras_require]
 hdf5 = h5py