Cython fails to build with Python 3.13.0a1. It's being solved but I open this issue for both better visibility and satisfaction of the automated tools. /builddir/build/BUILD/cython-3.0.4/Cython/Utils.c: In function ‘__Pyx_PyIter_Next2’: /builddir/build/BUILD/cython-3.0.4/Cython/Utils.c:27737:35: error: ‘_PyObject_NextNotImplemented’ undeclared (first use in this function); did you mean ‘PyObject_HashNotImplemented’? 27737 | if (unlikely(iternext == &_PyObject_NextNotImplemented)) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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-rawhide-x86_64/06561466-Cython/ For all our attempts to build Cython with Python 3.13, see: https://copr.fedorainfracloud.org/coprs/g/python/python3.13/package/Cython/ 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.
This blocks a big chunk of packages from being tested with Python 3.13. Upstream has a WIP Pull Request that I've iteratively submitted to Copr, but so far not successfully. https://github.com/cython/cython/pull/5767