Cannot build on 3.15t

[lmmx]

I have just been setting up CI for all available versions here

This means I now build a package using pygithub which depends transitively on cryptography, and while 3.15 is fine, 3.15t does not build:

• Link

        --- stderr
        error: The configured Python interpreter version (3.15) is newer than
      PyO3's maximum supported version (3.14)
        = help: please check if an updated version of PyO3 is available.
      Current version: 0.26.0
        = help: The free-threaded build of CPython does not support the
      limited API so this check cannot be suppressed.
      warning: build failed, waiting for other jobs to finish...
      💥 maturin failed
        Caused by: Failed to build a native library through cargo
        Caused by: Cargo build finished with "exit status:
      101": `env -u CARGO PYO3_BUILD_EXTENSION_MODULE="1"
      PYO3_ENVIRONMENT_SIGNATURE="cpython-3.15-64bit"
      PYO3_PYTHON="/home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpL3gsXp/bin/python"
      PYTHON_SYS_EXECUTABLE="/home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpL3gsXp/bin/python"
      "cargo" "rustc" "--profile" "release" "--message-format"
      "json-render-diagnostics" "--locked" "--manifest-path"
      "/home/runner/work/_temp/setup-uv-cache/sdists-v9/pypi/cryptography/46.0.3/8T9BoN7i5KY9nAk9SDoMH/src/src/rust/Cargo.toml"
      "--lib"`
      Error: command ['maturin', 'pep517', 'build-wheel', '-i',
      '/home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpL3gsXp/bin/python',
      '--compatibility', 'off'] returned non-zero exit status 1

      hint: This usually indicates a problem with the package or the build
      environment.
  help: `cryptography` (v46.0.3) was included because `octopolars` (v1.1.6)
        depends on `pygithub` (v2.8.1) which depends on `pyjwt[crypto]`
        (v2.10.1) which depends on `cryptography`

The latest PyO3 at time of writing is 0.27.2 (last week) and the tracking issue is

• Metaissue: 3.15 support PyO3/pyo3#5610

I don't see any build logs in the regular 3.15 job, so maybe it's that there are ready made wheels for that and the 3.15t needs to build it itself 🤔 Not sure how it works

Not a blocker for me but reporting as it doesn't seem to be on the radar here

[alex]

Free threaded Python does not have a stable, backwards-compatible, ABI (like ABI3), so we won't have support for it until the 3.15 ABI is stable.

[lmmx]

Okie doke, I'll leave this open then (or feel free to close if you have other tracking for 3.15t)

[ngoldbaum]

It'll require upstream support in PyO3 and maybe CFFI first. Once one of PEP 803 or 809 is accepted and there's a new abi to use in 3.15, I'll be adding support in pyo3 for 3.15 and the new ABI.

Before I can add support for the new ABI, I'll also have to work on implementing PyO3/pyo3#5644. That's probably the best issue to track for now.