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Add a struct, slot & function for checking an extension's ABI · Issue #137210 · python/cpython · GitHub

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Add a struct, slot & function for checking an extension's ABI #137210

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Add a struct, slot & function for checking an extension's ABI#137210
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interpreter-core(Objects, Python, Grammar, and Parser dirs)topic-C-APItype-featureA feature request or enhancement

Description

encukou
opened on Jul 29, 2025

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

Activity

  1. encukou
    added
    type-featureA feature request or enhancement
    topic-C-API
    on Jul 29, 2025
  2. StanFromIreland
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on Jul 29, 2025
  3. encukou
    removed
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on Jul 30, 2025
  4. picnixz
    added
    interpreter-core(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

    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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