Add Support for visionOS (Draft)

[johnzhou721]

Fix #207.

For some reason, when I try to test it using a modified version of the iOS testbed in the upstream cpython repo, it can't initialize the Python interpreter. I must have forgotten to do something. The traceback is from PyErr_Print. This is why it's draft.

Traceback (most recent call last):
  File "<frozen importlib._bootstrap>", line 23, in <module>
TypeError: cannot unpack non-iterable function object
/Users/johnzhou/Desktop/testbed/iOSTestbedTests/iOSTestbedTests.m:110: error: -[iOSTestbedTests testPython] : failed - Unable to initialize Python interpreter: failed to initialize importlib
Test Case '-[iOSTestbedTests testPython]' failed (2.082 seconds).
Test Suite 'iOSTestbedTests' failed at 2025-04-12 22:15:06.788.
	 Executed 1 test, with 1 failure (0 unexpected) in 2.082 (2.082) seconds

The modified testbed project, which includes my built XCFramework, is found at
https://drive.google.com/file/d/1OO7LBHUVQFsdaMZkvXi5WozE3WRf-Mp-/view?usp=sharing

CAVEAT: My autoconf (and friends) version seems to be wrong, and it generates code in aclocal.m4 to check for pkg-config, which fails. I therefore took out that block in the latest commit in this PR; if someone have the correct version of things, please run autoreconf -ivf on a patched Python source tree, and send me a diff.

PR Checklist:

• All new features have been tested
• All new features have been documented
• I have read the CONTRIBUTING.md file
• I will abide by the code of conduct

[freakboy3742]

Given the... enjoyment... that autoconf and friends has given you, I feel awful saying this - but the Python.patch changes need to be submitted as a PR against this branch of my fork of the cpython repo. I need to be able to reproduce this patch when any later changes are made, and without the upstream PR, I can't easily do that.

As for autoconf et al - Python has very specific autoconf requirements, documented at the top of configure.ac. As of Python3.14, those are autoconf 2.72, and aclocal 1.16. Unfortunately, this isn't a version that homebrew provided out of the box (AFAICT), so you will need to compile autoconf to have that available locally.

[johnzhou721]

@freakboy3742 Will do! Oopsies, forgot to squash my commits...

[johnzhou721]

@freakboy3742 Actually, would've been better if you told me. I feel awful for the amount of hours changing the "only in " whatever stuff by diff -ur without using git diff, on a source tree I downloaded myself... Yikes!

[johnzhou721]

Done. freakboy3742/cpython#6

[johnzhou721]

Sorry if my last comment sounds weird -- not blaming it on you -- just saying like it's my fault for not asking.

Also there's a repo on github for the old version so this is what I did (don't quote me on this though, I had lots of failed commands I removed in the middle):

brew tap tomtom-international/taps
brew unlink autoconf
brew unlink automake
brew install automake@1.16
brew unlink autoconf@2.69
brew link autoconf@2.72
autoreconf -ivf

[freakboy3742]

Sorry if my last comment sounds weird -- not blaming it on you -- just saying like it's my fault for not asking.

No worries - but regardless, I could have given you the heads up. This issue is mentioned in passing on the macCatalyst PR, but it would be easy to miss that comment.

Also there's a repo on github for the old version so this is what I did (don't quote me on this though, I had lots of failed commands I removed in the middle):

Sorry - I'm getting myself confused here. The current autoconf is 2.72; but older versions of CPython need 2.71 which is the version homebrew doesn't provide.

[johnzhou721]

Closed this because I am starting on a new branch.