%pyproject_buildrequires: Support Package information on ELF objects

When extension modules are built in %pyproject_buildrequires,
we need to create the package note file.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=2097535

This is tested via python-ldap -- %pyproject_buildrequires -w fails without the fix.

Neither python-markupsafe nor python-mistune can be used as a test
because they only warn when the extension module cannot be built
because they fallback to pure Python.

Related: rhbz#2117571

macros.pyproject

@@ -129,6 +129,9 @@ fi
 # The _auto_set_build_flags feature does not do this in %%generate_buildrequires section,
 # but we want to get an environment consistent with %%build:
 %{?_auto_set_build_flags:%set_build_flags}
+# The default flags expect the package note file to exist
+# see https://bugzilla.redhat.com/show_bug.cgi?id=2097535
+%{?_package_note_flags:%_generate_package_note_file}
 %{-R:
 %{-r:%{error:The -R and -r options are mutually exclusive}}
 %{-w:%{error:The -R and -w options are mutually exclusive}}

pyproject-rpm-macros.spec

@@ -128,6 +128,8 @@ export HOSTNAME="rpmbuild"  # to speedup tox in network-less mock, see rhbz#1856
 %changelog
 * Wed Jun 15 2022 Benjamin A. Beasley <code@musicinmybrain.net> - 1.3.2-1
 - Update %%pyproject_build_lib to support setuptools 62.1.0 and later
+- %%pyproject_buildrequires: When extension modules are built,
+  support https://fedoraproject.org/wiki/Changes/Package_information_on_ELF_objects
 
 * Fri May 27 2022 Owen Taylor <otaylor@redhat.com> - 1.3.1-1
 - %%pyproject_install: pass %%{_prefix} explicitly to pip install

tests/python-ldap.spec

@@ -28,6 +28,7 @@ Building this tests:
 - the proper files are installed in the proper places
 - module glob in %%pyproject_save_files (some modules are included, some not)
 - combined manual and generated Buildrequires
+- building an extension module via %%pyproject_buildrequires -w
 
 
 %package -n     python3-ldap
@@ -48,11 +49,13 @@ rm Tests/t_ldapobject.py Tests/t_cext.py Tests/t_edit.py Tests/t_ldap_sasl.py Te
 
 
 %generate_buildrequires
-%pyproject_buildrequires -t
+# -w is not required with this package, but we test that we can use it anyway
+%pyproject_buildrequires -t -w
 
 
 %build
-%pyproject_wheel
+#%%pyproject_wheel -- this is done via %%pyproject_buildrequires -w
+
 # Internal check that we can import the built extension modules from %%{pyproject_build_lib}
 %{python3} -c 'import _ldap' && exit 1 || true
 PYTHONPATH=%{pyproject_build_lib} %{python3} -c 'import _ldap'