feat: python >= 3.12 stable ABI

[jonasteuwen]

GitOrigin-RevId: 91f7f866d7348690bdc5286477993c01d404f840

[Copilot]

Pull request overview

This PR updates FastSlide’s Python wheel build/release pipeline to ship a stable-ABI (abi3) wheel for CPython >= 3.12 alongside a CPython 3.11-specific wheel, and bumps the project version to 0.8.1 across language bindings and packaging metadata.

Changes:

• Add a Bazel transition that pins both the Python toolchain version and nanobind’s py-limited-api setting for wheel builds.
• Update wheel build tooling/docs/CI to build and smoke-test a cp312-abi3 wheel plus a cp311 wheel (instead of a larger per-version matrix).
• Bump version strings from 0.8.0 → 0.8.1 across C/C++/Python/Bazel/Meson/docs metadata.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tools/versioned_py_wheel.bzl	Adds stable-ABI pinning to the wheel transition and updates the macro API.
tools/build_wheels.py	Simplifies wheel build CLI to build the fixed wheel set per platform.
tools/artifacts/wheels.py	Switches wheel-building from python-tag matrix to fixed WHEELS specs.
tools/artifacts/specs.py	Introduces WheelSpec and defines the two-wheel build set.
tools/artifacts/cli.py	Removes Python-tag selection; builds the fixed wheel set.
src/python/fastslide.cpp	Bumps Python extension __version__.
src/c/registry.cpp	Bumps C API version string.
rust/fastslide/src/lib.rs	Formatting-only changes.
rust/fastslide-sys/src/lib.rs	Formatting-only changes to extern declarations.
README.md	Updates wheel build instructions for cp312-abi3 + cp311.
python/fastslide/init.py	Bumps Python package __version__.
python/BUILD.bazel	Defines stable-ABI vs non-stable-ABI extension selection and two wheel targets.
pyproject.toml	Bumps version, raises minimum Python to >=3.11, updates meson-python requirement.
package/versions.json	Bumps packaged version string.
package/BUILD.bazel	Bumps package version constant.
MODULE.bazel	Updates default Python toolchain/pip parse to 3.12 and retains 3.11 for the cp311 wheel.
meson.build	Implements limited-API selection (>=3.12) and Windows link-dep workaround.
docs/source/guides/packages_and_releases.rst	Updates release docs for the two-wheel strategy and smoke tests.
docs/source/conf.py	Bumps docs release version.
docs/Doxyfile	Bumps Doxygen project number.
.github/workflows/release.yml	Adjusts cibuildwheel build matrix and smoke-test install logic for abi3.
.bazelrc	Sets default nanobind py-limited-api=cp312 for dev/test builds.

Comments suppressed due to low confidence (1)

tools/versioned_py_wheel.bzl:50

• ctx.attr.wheel is a single configured target (attr.label), not a list. Indexing it with [0] will fail at analysis time (provider lookup expects a Provider key, not an int), so this rule can't evaluate.

def _versioned_py_wheel_rule_impl(ctx):
    inner = ctx.attr.wheel[0]
    return [DefaultInfo(files = inner[DefaultInfo].files)]

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[Copilot]

Pull request overview

Copilot reviewed 22 out of 22 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

tools/artifacts/wheels.py:75

• This now invokes bazel build once per wheel (per platform), which can significantly increase build overhead and reduce Bazel’s ability to parallelize across transitioned configs. If the goal is only to build the fixed wheel set in WHEELS, consider building all wheel targets for a platform in a single Bazel invocation (and then collecting outputs per target) to restore parallelism and speed.

        for wheel in WHEELS:
            label = f"{platform_key} {wheel.tag}"
            print(f"\n▶︎ Building {wheel.tag} wheel for {platform_key} with {bazel_cmd}")

            try:
                common.run([bazel_cmd, "build", *bazel_flags, wheel.target], env=env)
            except subprocess.CalledProcessError:
                failures.append(label)
                print(f"❌ Build failed for {label}")
                if not keep_going:
                    return 1
                continue