"_upb_UnreachableFailure", Building wheel for protobuf (pyproject.toml) did not run successfully.

What version of protobuf and what language are you using?
Version: last stable release 7.36.0
Language: Python
linux provides by Mageia 10
building with python 3.13.13, gcc 15.2.0, rpmbuild 4.20.1

What did you do?
using a rpmbuild spec file, I build last protobuf archive release (tazr.gz) with those macros :
%generate_buildrequires
%pyproject_buildrequires
%pyproject_wheel

What did you expect to see
complete building

What did you see instead?
building stops with a ld error :

/usr/bin/ld: build/temp.linux-x86_64-cpython-313/python/convert.o: in function `upb_FieldDef_TypeString':
  /home/paul/rpmbuild/BUILD/python-protobuf-7.36.0-build/protobuf-7.36.0/python/convert.c:176:(.text+0x4c0): undefined reference to `_upb_UnreachableFailure'
  /usr/bin/ld: build/temp.linux-x86_64-cpython-313/upb/message/compare.o: in function `upb_MessageValue_IsEqual':
  /home/paul/rpmbuild/BUILD/python-protobuf-7.36.0-build/protobuf-7.36.0/upb/message/compare.h:70:(.text+0xb4a): undefined reference to `_upb_UnreachableFailure'
  /usr/bin/ld: build/temp.linux-x86_64-cpython-313/upb/message/compare.o: in function `_upb_Extension_IsEmpty_dont_copy_me__upb_internal_use_only':
  /home/paul/rpmbuild/BUILD/python-protobuf-7.36.0-build/protobuf-7.36.0/upb/message/internal/extension.h:71:(.text+0xb62): undefined reference to `_upb_UnreachableFailure'
  /usr/bin/ld: build/temp.linux-x86_64-cpython-313/upb/message/compare.o: in function `_upb_Message_ExtensionsAreEqual':
  /home/paul/rpmbuild/BUILD/python-protobuf-7.36.0-build/protobuf-7.36.0/upb/message/compare.c:162:(.text+0xb7a): undefined reference to `_upb_UnreachableFailure'
  /usr/bin/ld: build/temp.linux-x86_64-cpython-313/upb/message/compare.o: in function `upb_MessageValue_IsEqual':
  /home/paul/rpmbuild/BUILD/python-protobuf-7.36.0-build/protobuf-7.36.0/upb/message/compare.h:70:(.text+0xf19): undefined reference to `_upb_UnreachableFailure'
  /usr/bin/ld: build/temp.linux-x86_64-cpython-313/upb/message/convert.o:/home/paul/rpmbuild/BUILD/python-protobuf-7.36.0-build/protobuf-7.36.0/upb/message/internal/extension.h:71: more undefined references to `_upb_UnreachableFailure' follow

Anything else we should know about your project / environment
pyproject_buildrequires confirms that all requirements are available
although pyproject_wheel claims for an absent external symbol `_upb_UnreachableFailure'

Start by reproducing the wheel build with the reported rpmbuild macros and inspect the undefined symbol references in python/convert.c, upb/message/compare.c, and upb/message/internal/extension.h. Trace where _upb_UnreachableFailure is expected to be provided during linking. Done means the protobuf 7.36.0 wheel builds successfully on the reported Python and Linux environment.