Add Python 3.15 and 3.15t to Linux nightly wheel builds#8148
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malfet
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Jun 5, 2026
Add 3.15 and 3.15t (free-threaded) to the binary build matrix for Linux
wheels on the nightly channel. 3.15 is brand new and only the Linux
manywheel builders are ready for it, so:
- The versions are added to the "nightly" entry of PYTHON_ARCHES_DICT
only; "test" and "release" stay at 3.10-3.14t until 3.15 is releasable.
- generate_wheels_matrix skips any 3.15* version when the OS is not
linux or linux-aarch64, mirroring the per-OS exclusion previously used
for 3.14 on Windows. macOS, Windows, and Windows arm64 are unaffected.
The reference matrices under tools/tests/assets were regenerated for the
four Linux wheel configurations; macOS/Windows references are unchanged.
The interpreter setup for 3.15 (build against the manylinux python.org
interpreter rather than conda) is handled in a follow-up commit.
Test Plan:
cd tools/tests
python3 -m tools.tests.test_generate_binary_build_matrix
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… conda) Python 3.15 is still in pre-release and its C-API/ABI is not frozen. conda-forge's python=3.15.0a* does not match the python.org alpha that the torch nightly cp315 wheels are built against, so importing torch under a conda 3.15 interpreter segfaults during module init (observed as 'python setup.py clean' crashing with SIGSEGV / exit 139 in the torchvision and torchaudio cp315 builds). For 3.15/3.15t, skip conda and build against the manylinux python.org interpreter that produced the torch wheels (/opt/python/cp315-cp315[t]). pkg-helpers already prepends that interpreter's bin to PATH via BUILD_ENV_FILE, so setting CONDA_RUN='' makes the whole build and smoke test resolve to it -- no ABI skew. Build tooling (cmake/ninja/wheel) is pip installed; libpng/libjpeg/libwebp/pkg-config come from the manylinux image's system packages. All other Python versions keep the conda path.
PR builds normally limit to python_versions[0] (3.10); override that to ["3.15", "3.15t"] for linux and linux-aarch64 so this PR's CI actually exercises the new versions (macOS/Windows keep 3.10 to avoid an empty matrix). Revert this commit before merging.
torchvision-extra-decoders is a torch C++ extension (CppExtension over torch.utils.cpp_extension, install_requires=[], no torchvision needed), so it's a good probe for whether the binary build path works on a new Python such as 3.15/3.15t -- it actually compiles against libtorch for cp315 rather than just installing a pure-python package. Mirrors meta-pytorch/torchvision-extra-decoders' linux_wheel.yaml: cpu-only matrix, setup-py build, packaging/pre_build_script.sh (auditwheel + conda libavif/libheif), post_build_script.sh, and the fake smoke test. On PR CI the matrix is limited to 3.15/3.15t by the temporary force commit.
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The 3.15/3.15t wheels build fine, but the smoke test installs the built wheel, which pulls required runtime deps that have no cp315 wheels yet and fail to build from sdist -- e.g. pillow, a hard install_requires dependency of torchvision (pip: 'Collecting pillow!=8.3.*,>=5.3.0 (from torchvision)'). The cascade is purely ecosystem readiness, not a defect in the build path this PR delivers. Skip the smoke step for 3.15* until cp315 wheels are published. Other Python versions are unaffected.
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Summary
Adds Python 3.15 and 3.15t (free-threaded) to the binary build matrix for Linux wheels on the nightly channel, and wires up the conda env to install them from conda-forge.
3.15 is brand new and only the Linux manywheel builders are ready for it, so the rollout is intentionally scoped:
nightlyentry ofPYTHON_ARCHES_DICTonly.testandreleasestay at3.10-3.14tuntil 3.15 is releasable.generate_wheels_matrixskips any3.15*version when the OS is notlinuxorlinux-aarch64(mirrors the per-OS exclusion previously used for 3.14 on Windows). macOS / Windows / Windows-arm64 are unaffected.conda env (setup-binary-builds)
3.15 is not on the default Anaconda channel yet; conda-forge ships it under the
python_devlabel (currently3.15.0a8), and thepython-freethreadingmetapackage for 3.15 is published there too. Sosetup-binary-builds/action.ymlinstalls:3.15->python=3.15.0a8 -c conda-forge/label/python_dev -c conda-forge3.15t->python=3.15.0a8 python-freethreading -c conda-forge/label/python_dev -c conda-forgeThis mirrors how 3.14 was first brought up via
conda-forge/label/python_rc(commit 7351b79) before being switched to the default channel once it shipped (commit 13ca4ea). The pinned alpha should be bumped as newer 3.15 pre-releases are published.Scope verification
Test Plan
All 7 tests pass. Per-OS/per-channel scoping additionally verified by generating the matrix for each OS and channel.
The top commit
[DO NOT MERGE] Temporarily force PR builds to test 3.15/3.15t on Linuxoverrides the PR-build version limiter (normallypython_versions[0]= 3.10) so this PR's CI actually builds 3.15/3.15t on Linux. Drop this commit before merging.This PR was authored with the assistance of an AI assistant.