commit c4ee83c4987192bb7528ba0bb3be063fb753574e
author Thomas Braun <t-b@users.noreply.github.com> Fri Jul 18 18:50:33 2025 +0200
committer GitHub <noreply@github.com> Fri Jul 18 09:50:33 2025 -0700
tree c7851b8f38c6e0cc3d4ace470c8e68fe24b883be
parent cc69a3789cace002d6bb77d50ad8abf558bb5176

fix:: initialize_generic compiler warning about nullptr dereference (#5756)

When compiling an application using pybind11 3.0.0, GCC 13.3.0 and
python 3.11.13 the following warning is emitted [1]:

  In function 'PyObject* PyCFunction_GET_SELF(PyObject*)',
      inlined from 'void pybind11::cpp_function::initialize_generic(unique_function_record&&, const char*, const std::type_info* const*, pybind11::size_t)' at /opt/conda/lib/python3.11/site-packages/pybind11/include/pybind11/pybind11.h:605:30:
  /opt/conda/include/python3.11/cpython/methodobject.h:50:16: error: potential null pointer dereference [-Werror=null-dereference]
     50 |         return _Py_NULL;
        |                ^~~~~~~~

It stems form the fact that PyCFunction_GET_SELF can return a nullptr.
Let's fail in this case.

[1]: https://gitlab.com/tango-controls/pytango/-/jobs/10671972312#L570