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JIT might accidentally use Apple LLVM 21 on macOS #146475

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JIT might accidentally use Apple LLVM 21 on macOS#146475
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OS-macbuildThe build process and cross-buildinterpreter-core(Objects, Python, Grammar, and Parser dirs)pendingThe issue will be closed if no feedback is providedtopic-JITtype-bugAn unexpected behavior, bug, or error

Description

@Fidget-Spinner
Fidget-Spinner
opened on Mar 26, 2026

Bug report

Bug description:

The JIT is incompatible with Apple LLVM 21, but sometimes it finds it and the tool check passes. We should block it.

Thanks to @kumaraditya303 for finding this issue.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

Activity

  1. Fidget-Spinner
    added
    type-bugAn unexpected behavior, bug, or error
    on Mar 26, 2026
  2. aisk
    added
    buildThe build process and cross-build
    topic-JIT
    on Mar 26, 2026
  3. picnixz
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    OS-mac
    on Mar 26, 2026
  4. ashutoshk314
    added 2 commits that reference this issue on Mar 26, 2026

    pythongh-146475: Block Apple LLVM 21 from passing JIT tool version check

    f29015e

    pythongh-146475: Add NEWS entry

    ac68191
  5. savannahostrowski
    added a commit that references this issue on Apr 30, 2026

    GH-146475: Block Apple Clang for building JIT stencils (#149188)

    c0e0640
  6. StanFromIreland
    added
    pendingThe issue will be closed if no feedback is provided
    on May 2, 2026
  7. savannahostrowski
    added 2 commits that reference this issue on May 4, 2026

    [3.13] GH-146475: Block Apple Clang for building JIT stencils (#149188)…

    d82d5c2

    [3.14] GH-146475: Block Apple Clang for building JIT stencils (#149188)…

    c55cce2
  8. savannahostrowski
    closed this as completedon May 4, 2026
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    OS-macbuildThe build process and cross-buildinterpreter-core(Objects, Python, Grammar, and Parser dirs)pendingThe issue will be closed if no feedback is providedtopic-JITtype-bugAn unexpected behavior, bug, or error

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