[issue44220] PyStructSequence_UnnamedField unavailable on Windows

[Petr Viktorin]

Petr Viktorin  added the comment:

It should be available in python3x.dll (e.g. pyhon310.dll).
It  is  not  available in python3.dll  (the stable ABI), until Python 3.11.

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.11 -Python 3.7, Python 3.9

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[issue44220] PyStructSequence_UnnamedField unavailable on Windows

[Petr Viktorin]

Petr Viktorin  added the comment:


New changeset 2cbf50e8126905b57ba9d0d5aa4e238c817d5a03 by Ken Jin in branch 
'main':
bpo-44220: Export PyStructSequence_UnnamedField in the limited API (GH-26331)
https://github.com/python/cpython/commit/2cbf50e8126905b57ba9d0d5aa4e238c817d5a03


--
nosy: +petr.viktorin

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[issue44220] PyStructSequence_UnnamedField unavailable on Windows

[Ken Jin]

Change by Ken Jin :


--
keywords: +patch
nosy: +kj
nosy_count: 5.0 -> 6.0
pull_requests: +24923
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/26331

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[issue44220] PyStructSequence_UnnamedField unavailable on Windows

[John Nelson]

New submission from John Nelson :

The symbol "PyStructSequence_UnnnamedField" is not *explicitly* marked for 
export, causing it to be omitted from python3x.dll on Windows -- and thus 
unavailable to Windows extension modules.

Attempting to use this symbol then fails at link time:
  test.obj : error LNK2001: unresolved external symbol 
PyStructSequence_UnnamedField
  build\lib.win-amd64-3.7\test.cp39-win_amd64.pyd : fatal error LNK1120: 1 
unresolved externals

The fact that the symbol is missing can also be demonstrated via ctypes:
  import ctypes
  from pathlib import Path
  import sys

  python_dll = ctypes.CDLL(str(Path(sys.executable).parent / 'python3.dll'))

  # These don't raise at all
  python_dll.PyTuple_Type
  python_dll.PyStructSequence_New

  # Raises AttributeError
  python_dll.PyStructSequence_UnnamedField

--
components: Interpreter Core, Windows
messages: 394226
nosy: johnboy2, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: PyStructSequence_UnnamedField unavailable on Windows
type: behavior
versions: Python 3.7, Python 3.9

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