Python 3.11 gives SystemError: type Boost.Python.enum has the Py_TPFLAGS_HAVE_GC flag but has no traverse function
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Start in libs/python/src/object/enum.cpp at the Py_TPFLAGS_HAVE_GC line and reproduce the Python 3.11 import failure using the reported Boost 1.80 MSVC build. Compare behavior with and without that flag, then verify that the binding imports successfully on Python 3.11 without breaking the previously supported Python versions.
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Description
Up to Python 3.10 our Boost Python binding ran fine.
As of Python 3.11 we get the following error upon import of the binding;
SystemError: type Boost.Python.enum has the Py_TPFLAGS_HAVE_GC flag but has no traverse function
Running;
Python 3.11.0 (main, Oct 24 2022, 18:26:48) [MSC v.1933 64 bit (AMD64)] on win32
boost_1_80_0
b2 -j%NUMBER_OF_PROCESSORS% python=3.11 --with-python --stage-libdir=lib64-msvc-14.3 --build-type=complete toolset=msvc-14.3 address-model=64 architecture=x86 debug-symbols=on stage
If I remove line 116 of libs\python\src\object\enum.cpp I don't get the error.
#if PY_VERSION_HEX < 0x03000000
| Py_TPFLAGS_CHECKTYPES
#endif
| Py_TPFLAGS_HAVE_GC /* <============== remove this line */
| Py_TPFLAGS_BASETYPE, /* tp_flags */
Is it safe to do this?
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- C++
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