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vllm - 💡(How to fix) Fix [v0.20.0] cp38-abi3 wheels contains cp312 bindings [2 comments, 2 participants]

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vllm-project/vllm#41487•Fetched 2026-05-02 05:27:50
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Code Example

$ unzip -v vllm-0.20.0-cp38-abi3-manylinux_2_35_x86_64.whl | grep cpython
 1352656  Defl:N   483912  64% 04-27-2026 07:59 cdda9112  vllm/third_party/deep_gemm/_C.cpython-312-x86_64-linux-gnu.so
RAW_BUFFERClick to expand / collapse

Your current environment

Version 0.20.0 PyPI wheels.

🐛 Describe the bug

The pre-built wheel on PyPI is tagged cp38-abi3 and contains

$ unzip -v vllm-0.20.0-cp38-abi3-manylinux_2_35_x86_64.whl | grep cpython
 1352656  Defl:N   483912  64% 04-27-2026 07:59 cdda9112  vllm/third_party/deep_gemm/_C.cpython-312-x86_64-linux-gnu.so

which will break if one use python 3.8-3.11, 3.13-3.14 and deep-gemm.

This wheel only correctly works for Python 3.12. Or that SO is mistagged and should be abi3?

Alternatively, one can build from source with the desired cpython version.

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extent analysis

TL;DR

The pre-built wheel on PyPI is incorrectly tagged as cp38-abi3 and only works with Python 3.12, so a new wheel should be built with the correct ABI tag or from source for other Python versions.

Guidance

  • Verify the Python version being used and check if it matches the expected version for the pre-built wheel.
  • Consider building the wheel from source with the desired Python version to ensure compatibility.
  • Check the ABI tag of the pre-built wheel and ensure it matches the expected ABI for the Python version being used.
  • If using a version of Python other than 3.12, try building from source or using a different wheel with the correct ABI tag.

Example

No code snippet is provided as the issue is related to wheel compatibility and ABI tags.

Notes

The issue is specific to the pre-built wheel on PyPI and its compatibility with different Python versions. Building from source or using a different wheel with the correct ABI tag may resolve the issue.

Recommendation

Apply workaround: Build the wheel from source with the desired Python version to ensure compatibility, as the pre-built wheel on PyPI is incorrectly tagged and only works with Python 3.12.

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vllm - 💡(How to fix) Fix [v0.20.0] cp38-abi3 wheels contains cp312 bindings [2 comments, 2 participants]