Bug: Segfault when building uvloop on 3.14

[Ahajha]

Repro (with uv):

uv venv --python 3.14
source .venv/bin/activate
uv pip install uvloop

gives

Resolved 1 package in 2ms
  × Failed to build `uvloop==0.21.0`
  ├─▶ The build backend returned an error
  ╰─▶ Call to `setuptools.build_meta.build_wheel` failed (signal: 11 (SIGSEGV)
      (core dumped))
      hint: This usually indicates a problem with the package or the build
      environment.

This works with --python 3.13. Unfortunately the error is... less than helpful.

This is on a Pop_OS! 22.04 machine.

[akirchhoff-modular]

I'm trying to reproduce this and I haven't been successful. I don't have a Pop!_OS machine available, but I did try:

1. From an Ubuntu 22.04.5 LTS machine
2. From a Pop!_OS 22.04 LTS Docker container (specifically this unofficial image which appears to be based on the ISO) on the aforementioned machine

Both environments seemed to build uvloop without issue; I could not reproduce a segmentation fault.

Could you try again, with -v on the uv pip install line? This should provide more detail about what's going on during the installation process, and might hint at what's going on when the segmentation fault occurs.

[GHLuckM4n]

I try to install with uv

SetuptoolsDeprecationWarning: project.license as a TOML table is deprecated !!

[Ahajha]

After failing to replicate it on two other machines, I found the culprit: uv for some reason was picking up 3.14.0a6 on this machine, while the other machines were using betas or rcs. Specifying uv venv --python 3.14.0rc3 (tangent: can't figure out how to get uv to install exactly 3.14.0, it insists on installing something other than the final release) fixes the issue. So 'twas a CPython issue that is now fixed.