[Epel-packagers-sig] [Bug 2250850] New: rb_libtorrent fails to build with Python 3.13: error: implicit declaration of function ‘PyEval_InitThreads’

https://bugzilla.redhat.com/show_bug.cgi?id=2250850

Bug ID: 2250850
           Summary: rb_libtorrent fails to build with Python 3.13: error:
                    implicit declaration of function ‘PyEval_InitThreads’
           Product: Fedora
           Version: rawhide
            Status: NEW
         Component: rb_libtorrent
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail],
                    [e-mail], [e-mail], [e-mail],
                    [e-mail]
            Blocks: 2244836 (PYTHON3.13)
  Target Milestone: ---
    Classification: Fedora

rb_libtorrent fails to build with Python 3.13.0a1.

/builddir/build/BUILD/libtorrent-rasterbar-2.0.9/bindings/python/src/module.cpp:
In function ‘void init_module_libtorrent()’:
/builddir/build/BUILD/libtorrent-rasterbar-2.0.9/bindings/python/src/module.cpp:38:5:
error: ‘PyEval_InitThreads’ was not declared in this scope; did you mean
‘PyEval_SaveThread’?
   38 |     PyEval_InitThreads();
      |     ^~~~~~~~~~~~~~~~~~
      |     PyEval_SaveThread
According to https://docs.python.org/3.13/whatsnew/3.13.html:

Remove PyEval_InitThreads() and PyEval_ThreadsInitialized() functions,
deprecated in Python 3.9.
Since Python 3.7, Py_Initialize() always creates the GIL:
calling PyEval_InitThreads() did nothing and PyEval_ThreadsInitialized() always
returned non-zero.
(Contributed by Victor Stinner in
https://github.com/python/cpython/issues/105182.)

https://docs.python.org/3.13/whatsnew/3.13.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.13/fedora-ra...

For all our attempts to build rb_libtorrent with Python 3.13, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/package/rb_libto...

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package
builds with Python 3.13:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/

Let us know here if you have any questions.

Python 3.13 is planned to be included in Fedora 41.
To make that update smoother, we're building Fedora packages with all
pre-releases of Python 3.13.
A build failure prevents us from testing all dependent packages (transitive
[Build]Requires),
so if this package is required a lot, it's important for us to get it fixed
soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work
around it on our side.

Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=2244836
[Bug 2244836] Python 3.13