python3.lib in Python3.9.0 Windows distribution does not contain PyObject_CallNoArgs symbol

[DavidHewitt]

BPO	42415
Nosy	@pfmoore, @vstinner, @tjguk, @alex, @zware, @zooba, @ZackerySpytz
PRs	bpo-42415: Add PyObject_CallNoArgs to PC\python3dll.c #23415 [3.9] bpo-42415: Add symbols of the stable ABI to python3dll.c (GH-23598) #23801

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-12-16.21:43:38.059>
created_at = <Date 2020-11-19.22:47:45.721>
labels = ['3.9', '3.10', 'extension-modules', 'expert-C-API', 'build', 'OS-windows']
title = 'python3.lib in Python3.9.0 Windows distribution does not contain PyObject_CallNoArgs symbol'
updated_at = <Date 2020-12-16.21:43:38.058>
user = 'https://bugs.python.org/DavidHewitt'

bugs.python.org fields:

activity = <Date 2020-12-16.21:43:38.058>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-16.21:43:38.059>
closer = 'vstinner'
components = ['Extension Modules', 'Windows', 'C API']
creation = <Date 2020-11-19.22:47:45.721>
creator = 'David Hewitt'
dependencies = []
files = []
hgrepos = []
issue_num = 42415
keywords = ['patch']
message_count = 5.0
messages = ['381458', '381459', '381460', '383170', '383211']
nosy_count = 8.0
nosy_names = ['paul.moore', 'vstinner', 'tim.golden', 'alex', 'zach.ware', 'steve.dower', 'ZackerySpytz', 'David Hewitt']
pr_nums = ['23415', '23801']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue42415'
versions = ['Python 3.9', 'Python 3.10']

[DavidHewitt]

I'm unsure if this is a packaging error or a misunderstanding by me.

I'm trying to link a binary on windows with Py_LIMITED_API set. According to https://www.python.org/dev/peps/pep-0384/#linkage I _think_ I'm supposed to be linking against python3.lib (instead of python39.lib).

However my build fails because the PyObject_CallNoArgs symbol is not present in python3.lib

I see that the symbol is indeed present in python39.lib

Is this a misunderstanding on my part? I was under the impression that python3.lib will only contain symbols available in the limited api, and that (since 3.9) PyObject_CallNoArgs is part of the limited api.

[alex]

This looks like a bug to me. While 2ff58a2 added it to the header, it did not add it to https://github.com/python/cpython/blob/master/PC/python3dll.c which is required.

[zooba]

Yeah, this will be our fault.

Someone is looking into automatically generating the .def file so that this stops happening. Last time we tried that there was a lot of pushback because "too many APIs will become stable", but this time I think we're just going to force those devs to care for their APIs properly.

(I'm blanking right now on who was working on this... anyone remember?)