[Python-Dev] Stable ABI or not for PyTypeObject? (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Mon May 6 11:34:22 EDT 2019

On Mon, 6 May 2019 15:55:03 +0200 Jeroen Demeyer <J.Demeyer at UGent.be> wrote:

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 tpfinalize in Python 3.4, PEP 442), care was taken not to break the ABI by using the PyTPFLAGSHAVEFINALIZE flag. There is some discussion about this on https://bugs.python.org/issue32388

The discussion there was more or less conclusive. At the time it was too late to go into 3.7 and then I (and others) forgot about it.

We should revive that PR in time for 3.8.

Regards

Antoine.

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