The following change introduced a compiler warning: commit c5cb077ab3c88394b7ac8ed4e746bd31b53e39f1 Author: Victor Stinner <vstinner@python.org> Date: Tue Sep 22 12:42:28 2020 +0200 Py_IS_TYPE() macro uses Py_TYPE() (GH-22341) Steps to Reproduce: 1. dnf install -y python3-devel pkgconf-pkg-config gcc 2. printf '#include <Python.h>' > test.c 3. gcc -Wcast-qual -Werror -c test.c `pkg-config --cflags --libs python-3.10` Actual results: sh-5.1# gcc -Wcast-qual -Werror -c test.c `pkg-config --cflags --libs python-3.10` In file included from /usr/include/python3.10/Python.h:78, from test.c:1: /usr/include/python3.10/object.h: In function ‘_Py_IS_TYPE’: /usr/include/python3.10/object.h:112:29: error: cast discards ‘const’ qualifier from pointer target type [-Werror=cast-qual] 112 | #define _PyObject_CAST(op) ((PyObject*)(op)) | ^ /usr/include/python3.10/object.h:137:34: note: in expansion of macro ‘_PyObject_CAST’ 137 | #define Py_TYPE(ob) (_PyObject_CAST(ob)->ob_type) | ^~~~~~~~~~~~~~ /usr/include/python3.10/object.h:144:12: note: in expansion of macro ‘Py_TYPE’ 144 | return Py_TYPE(ob) == type; | ^~~~~~~ cc1: all warnings being treated as errors Attached PR fix the compiler warning. Issue reported on Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=1969663

Comment from my PR: // bpo-44378: Don't use Py_TYPE() since Py_TYPE() requires a non-const // object. By the way, I wrote a change in Python 3.11 to convert Py_TYPE() macro into a static inline function which accepts a *const* PyObject pointer ("const PyObject*"): https://github.com/python/cpython/commit/f3fa63ec75fdbb4a08a10957a5c631bf0c4a5970 But this change had to be reverted since it caused a buildbot regression (bpo-44348).

 New changeset 304dfec8d3c0763734ea8b5fa2af1d9e1ce69ffa by Victor Stinner in branch 'main': bpo-44378: Fix a compiler warning in Py_IS_TYPE() (GH-26644) https://github.com/python/cpython/commit/304dfec8d3c0763734ea8b5fa2af1d9e1ce69ffa 

 New changeset e6d28a1a6ad22125fc3a6df2d611d79aa8d6f67e by Miss Islington (bot) in branch '3.10': bpo-44378: Fix a compiler warning in Py_IS_TYPE() (GH-26644) https://github.com/python/cpython/commit/e6d28a1a6ad22125fc3a6df2d611d79aa8d6f67e