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python3.lib in Python3.9.0 Windows distribution does not contain PyObject_CallNoArgs symbol #86581
Description
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']
Activity
DavidHewitt commentedon Nov 19, 2020
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 commentedon Nov 19, 2020
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 commentedon Nov 20, 2020
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?)
vstinner commentedon Dec 16, 2020
commit fcc6935
Author: Victor Stinner <vstinner@python.org>
Date: Wed Dec 16 15:08:23 2020 +0100
I backported the change manually to 3.9: PR 23801.
vstinner commentedon Dec 16, 2020
Thanks David Hewitt for the bug report, and Zackery Spytz for your fix!
3.9 fix:
commit 1662868
Author: Victor Stinner <vstinner@python.org>
Date: Wed Dec 16 22:41:47 2020 +0100