Cannot build intbitset for Python 3.13.0

[JonoYang]

I was trying to test scancode-toolkit with Python 3.13.0 and I ran into this when configuring it:

  Building wheel for intbitset (pyproject.toml) ... error
  error: subprocess-exited-with-error
  
  × Building wheel for intbitset (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [44 lines of output]
      running bdist_wheel
      running build
      running build_py
      creating build/lib.linux-x86_64-cpython-313
      copying intbitset/intbitset_helper.py -> build/lib.linux-x86_64-cpython-313
      copying intbitset/intbitset_version.py -> build/lib.linux-x86_64-cpython-313
      running egg_info
      writing intbitset/intbitset.egg-info/PKG-INFO
      writing dependency_links to intbitset/intbitset.egg-info/dependency_links.txt
      writing requirements to intbitset/intbitset.egg-info/requires.txt
      writing top-level names to intbitset/intbitset.egg-info/top_level.txt
      reading manifest file 'intbitset/intbitset.egg-info/SOURCES.txt'
      reading manifest template 'MANIFEST.in'
      warning: no files found matching '*.sh'
      warning: no files found matching '*.yml'
      warning: no files found matching '*.css' under directory 'docs/_themes'
      warning: no files found matching '*.css_t' under directory 'docs/_themes'
      warning: no files found matching '*.conf' under directory 'docs/_themes'
      warning: no files found matching '*.html' under directory 'docs/_themes'
      warning: no files found matching 'COPYING' under directory 'docs/_themes'
      warning: no files found matching 'README' under directory 'docs/_themes'
      warning: no files found matching '*.html' under directory 'docs/_templates'
      adding license file 'LICENSE'
      adding license file 'AUTHORS.rst'
      adding license file 'README.rst'
      adding license file 'CHANGELOG.rst'
      writing manifest file 'intbitset/intbitset.egg-info/SOURCES.txt'
      running build_ext
      building 'intbitset' extension
      creating build/temp.linux-x86_64-cpython-313/intbitset
      gcc -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall -fPIC -I/home/jono/nexb/src/scancode-toolkit/venv/include -I/home/jono/.pyenv/versions/3.13.0/include/python3.13 -c intbitset/intbitset.c -o build/temp.linux-x86_64-cpython-313/intbitset/intbitset.o
      intbitset/intbitset.c:1275:1: warning: ‘Py_UNICODE’ is deprecated [-Wdeprecated-declarations]
       1275 | static CYTHON_INLINE size_t __Pyx_Py_UNICODE_strlen(const Py_UNICODE *u)
            | ^~~~~~
      intbitset/intbitset.c: In function ‘__Pyx_Py_UNICODE_strlen’:
      intbitset/intbitset.c:1277:5: warning: ‘Py_UNICODE’ is deprecated [-Wdeprecated-declarations]
       1277 |     const Py_UNICODE *u_end = u;
            |     ^~~~~
      intbitset/intbitset.c: In function ‘__pyx_pf_9intbitset_9intbitset___cinit__’:
      intbitset/intbitset.c:4268:26: error: implicit declaration of function ‘PyObject_AsReadBuffer’; did you mean ‘PyObject_GetBuffer’? [-Wimplicit-function-declaration]
       4268 |             __pyx_t_4 = (PyObject_AsReadBuffer(__pyx_v_tmp, (&__pyx_v_buf), (&__pyx_v_size)) < 0);
            |                          ^~~~~~~~~~~~~~~~~~~~~
            |                          PyObject_GetBuffer
      error: command '/usr/bin/gcc' failed with exit code 1
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for intbitset

PyObject_AsReadBuffer has been deprecated and should be replaced with PyObject_GetBuffer (python/cpython#85275)

[JonoYang]

There is a PR upstream that has the required changes: inveniosoftware-contrib#97