[Python-Dev] Stable ABI or not for PyTypeObject?

[Victor Stinner]

PyType_FromSpec() looks like a better approach for ABI compatibility.
My notes on types and ABI:
https://pythoncapi.readthedocs.io/type_object.html

Victor

Le lun. 6 mai 2019 à 09:57, Jeroen Demeyer <J.Demeyer at ugent.be> a écrit :
>
> Hello,
>
> I have a simple question for which there doesn't seem to be a good
> answer: is the layout of PyTypeObject considered to be part of the
> stable ABI?
>
> Officially, the answer is certainly "no" (see PEP 384).
>
> However, unofficially the answer might be "yes". At least, the last time
> that an incompatible change was made to PyTypeObject (adding tp_finalize
> in Python 3.4, PEP 442), care was taken not to break the ABI by using
> the Py_TPFLAGS_HAVE_FINALIZE flag.
>
> There is some discussion about this on https://bugs.python.org/issue32388
>
> The implementation of PEP 590 is going to make another ABI-breaking
> change. So should we add a new Py_TFLAGS_HAVE_... flag for that or not?
>
>
> Jeroen.
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