python: add support for the CPython stable ABI (cp310-abi3 wheels)#244
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danceratopz wants to merge 2 commits into
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python: add support for the CPython stable ABI (cp310-abi3 wheels)#244danceratopz wants to merge 2 commits into
danceratopz wants to merge 2 commits into
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The cffi-generated extension module has always been compiled with Py_LIMITED_API (cffi's default): the shipped modules are named _ethash.abi3.so and the Windows .pyd links python3.dll. The wheels were just tagged with the interpreter that built them, so each release only covered the Python versions it was built for and newer versions (e.g. 3.14) fall back to an sdist build requiring cmake and a C toolchain. Tell bdist_wheel about the limited API so wheels are tagged cp310-abi3, matching python_requires='>=3.10'. A single wheel per platform now covers Python 3.10 and all later versions, so build with only one interpreter per platform in CI. Note the abi3 tag does not apply to free-threaded builds; those still use the sdist.
chfast
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Jul 15, 2026
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Please remove the release 1.1.1 from the PR. We will do the release after.
And cut the PR description to the merit (add support for python stable API).
The version number and release date are decided at release time.
danceratopz
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The cffi-generated extension module is already compiled against the stable ABI (
Py_LIMITED_APIis cffi's default): the shipped modules are_ethash.abi3.so, and the Windows.pydlinkspython3.dll. Only the wheel tags are per-version, becausebdist_wheelis never told about the limited API.setup.cfgwith[bdist_wheel] py_limited_api = cp310(matchingpython_requires='>=3.10'), so wheels are taggedcp310-abi3: a single wheel per platform covers CPython 3.10 and all later versions, including 3.14.scripts/ci/python_build_wheels.shto a single interpreter per platform.auditwheel repairpreserves the abi3 tag.Programming Language :: Python :: 3.14classifier.Verified:
uv build --wheelproducesethash-1.1.0-cp310-abi3-linux_x86_64.whl, which installs and passes the binding tests on CPython 3.14 in a container without cmake or a C toolchain. (abi3 does not apply to free-threaded builds or PyPy; those keep using the sdist.)Fixes the sdist fallback described in ethereum/execution-specs#3173.