https://github.com/boostorg/python/commit/a218babc8daee904a83f550fb66e5cb3f1cb3013 From a218babc8daee904a83f550fb66e5cb3f1cb3013 Mon Sep 17 00:00:00 2001 From: Victor Stinner Date: Mon, 25 Apr 2022 10:51:46 +0200 Subject: [PATCH] Fix enum_type_object type on Python 3.11 The enum_type_object type inherits from PyLong_Type which is not tracked by the GC. Instances doesn't have to be tracked by the GC: remove the Py_TPFLAGS_HAVE_GC flag. The Python C API documentation says: "To create a container type, the tp_flags field of the type object must include the Py_TPFLAGS_HAVE_GC and provide an implementation of the tp_traverse handler." https://docs.python.org/dev/c-api/gcsupport.html The new exception was introduced in Python 3.11 by: https://github.com/python/cpython/issues/88429 --- src/object/enum.cpp | 1 - 1 file changed, 1 deletion(-) diff --git a/src/object/enum.cpp b/src/object/enum.cpp index 293e705899..5753b32e07 100644 --- a/src/object/enum.cpp +++ b/libs/python/src/object/enum.cpp @@ -113,7 +113,6 @@ static PyTypeObject enum_type_object = { #if PY_VERSION_HEX < 0x03000000 | Py_TPFLAGS_CHECKTYPES #endif - | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE, /* tp_flags */ 0, /* tp_doc */ 0, /* tp_traverse */