Description

encukou

opened on Jul 29, 2025

Issue body actions

Feature or enhancement

See discussion: https://discuss.python.org/t/module-slot-for-checking-abi-compatibility/96443/

The checks we can do using C API are limited, but would still be useful, e.g. for the case of mixing up GIL-ful and free-threaded extensions/builds.

I propose adding:

• PyABIInfo struct with:
  • abiinfo_major_version
  • abiinfo_minor_version
  • flags which can be set to:
    • PyABIInfo_DEFAULT_FLAGS
    • PyABIInfo_STABLE
    • PyABIInfo_INTERNAL
    • PyABIInfo_FREETHREADED
    • PyABIInfo_GIL
  • build_version
  • abi_version
• int PyABIInfo_Check(PyABIInfo *info, const char *module_name)
• PyABIInfo_VAR(NAME) macro that defines a suitable PyABIInfo variable
• Py_mod_abi, a module slot that causes a PyABIInfo_Check call

C API WG vote pending: capi-workgroup/decisions#72

Linked PRs

• gh-137210: Add a struct, slot & function for checking an extension's ABI #137212
• gh-137210: Move PYTHON_API_VERSION & PYTHON_ABI_VERSION to patchlevel.h #138545

Activity

1. encukou

   added

   type-featureA feature request or enhancementA feature request or enhancement

   topic-C-API

   on Jul 29, 2025
2. StanFromIreland

   added

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Jul 29, 2025
3. encukou

   removed

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Jul 30, 2025
4. picnixz

   added

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Aug 1, 2025
5. encukou

   added a commit that references this issue on Sep 5, 2025

   gh-137210: Add a struct, slot & function for checking an extension's …

   0c74fc8
6. encukou commented on Sep 5, 2025

   

   encukou

   on Sep 5, 2025

   MemberAuthor

   More actions

   Keeping open for a touch-up; see #137212 (comment)
7. encukou

   added a commit that references this issue on Sep 8, 2025

   gh-137210: Move PYTHON_API_VERSION & PYTHON_ABI_VERSION to patchlevel…

   097c563
8. encukou

   closed this as completedon Sep 8, 2025
9. lkollar

   added 2 commits that reference this issue on Sep 9, 2025

   pythongh-137210: Add a struct, slot & function for checking an extens…

   8ac4c6e

   pythongh-137210: Move PYTHON_API_VERSION & PYTHON_ABI_VERSION to patc…

   17849df

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