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Details

Type: Bug
Resolution: Done
Priority: Not Evaluated
Fix Version/s: None
Affects Version/s: 6.2.2, 6.2.3, 6.3.0
Component/s: PySide
Labels:
None
Environment:
macOS 11.6.2 (Big Sur), Intel MacBook Pro
Python 3.6.15 (from MacPorts)

Debian Buster, Debian Bullseye, Ubuntu 20.04

Platform/s:

Linux/X11, macOS
Commits:
bcd1ac22f8 (pyside/pyside-setup/dev) 725be71849 (pyside/pyside-setup/6.3) 725be71849 (pyside/pyside-setup/wip/6.3_pypy) 725be71849 (pyside/tqtc-pyside-setup/6.3) 4a799fee40 (pyside/tqtc-pyside-setup/6.2), 7f567ae2a (tqtc/lts-5.15), 755bf6cab (dev)

Description

The PySide6 macOS universal2 wheels uploaded for recent releases 6.2.2 and 6.2.2.1 appear to have an ABI compatibility issue on Python 3.6 and 3.7, and following a successful `pip install`, importing `PySide6.QtCore` fails with this combination of platform and Python version, with error "Symbol not found: _PyIndex_Check"

Detailed steps to reproduce:

Create a new Python 3.6 or Python 3.7 virtual environment, and activate that environment.
If necessary, upgrade `pip` to the most recent version (21.3.1) in that environment
Install PySide6 with
```
python -m pip install PySide6
```

Execute
```
python -c "import PySide6.QtCore"
```

On my machine, the install succeeds, but the final step fails with

Symbol not found: _PyIndex_Check

I was expecting the import to succeed with no error. I see the same results with Python 3.6 and 3.7, but not with Python 3.8 or later. I also don't see any issue with PySide6 6.2.1 or earlier.

Here's a full transcript of a shell session on my machine.

mdickinson@mirzakhani ~ % python3.6 -VV
Python 3.6.15 (default, Nov  9 2021, 16:18:30) 
[GCC Apple LLVM 13.0.0 (clang-1300.0.29.3)]
mdickinson@mirzakhani ~ % python3.6 -m venv --clear ~/.venvs/testing && source ~/.venvs/testing/bin/activate
(testing) mdickinson@mirzakhani ~ % python -m pip install --upgrade pip
Collecting pip
  Using cached https://files.pythonhosted.org/packages/a4/6d/6463d49a933f547439d6b5b98b46af8742cc03ae83543e4d7688c2420f8b/pip-21.3.1-py3-none-any.whl
Installing collected packages: pip
  Found existing installation: pip 18.1
    Uninstalling pip-18.1:
      Successfully uninstalled pip-18.1
Successfully installed pip-21.3.1
(testing) mdickinson@mirzakhani ~ % python -m pip install PySide6
Collecting PySide6
  Using cached PySide6-6.2.2.1-6.2.2-cp36.cp37.cp38.cp39.cp310-abi3-macosx_10_14_universal2.whl (320.4 MB)
Collecting shiboken6==6.2.2.1
  Using cached shiboken6-6.2.2.1-6.2.2-cp36.cp37.cp38.cp39.cp310-abi3-macosx_10_14_universal2.whl (1.1 MB)
Installing collected packages: shiboken6, PySide6
Successfully installed PySide6-6.2.2.1 shiboken6-6.2.2.1
(testing) mdickinson@mirzakhani ~ % python -c "import PySide6.QtCore"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: dlopen(/Users/mdickinson/.venvs/testing/lib/python3.6/site-packages/PySide6/QtCore.abi3.so, 2): Symbol not found: _PyIndex_Check
  Referenced from: /Users/mdickinson/.venvs/testing/lib/python3.6/site-packages/PySide6/QtCore.abi3.so
  Expected in: flat namespace
 in /Users/mdickinson/.venvs/testing/lib/python3.6/site-packages/PySide6/QtCore.abi3.so

Entering wild guess territory: I suspect that the issue is that the macOS wheels for the recent releases of PySide6 were built on Python 3.8, presumably because this was the only way to create universal2 wheels. But there was a bug with Python's stable ABI related to PyIndex_Check, which was a macro in Python 3.6 and 3.7, and only became a function in Python 3.8. See https://bugs.python.org/issue33738. So these wheels fail on Python 3.6 and 3.7.