owillebo commented 1 year ago

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?

AllSeeingEyeTolledEweSew commented 1 year ago

385

owillebo commented 1 year ago

Fixed;

https://github.com/boostorg/python/commit/a218babc8daee904a83f550fb66e5cb3f1cb3013

boostorg / python

Python 3.11 gives SystemError: type Boost.Python.enum has the Py_TPFLAGS_HAVE_GC flag but has no traverse function #400

385