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GeezerVison is showing github.com — Wrong LLVM tools picked up if using MSVC activation and custom LLVM build · Issue #138451 · python/cpython

Wrong LLVM tools picked up if using MSVC activation and custom LLVM build #138451

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#138452
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Wrong LLVM tools picked up if using MSVC activation and custom LLVM build#138451
#138452
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buildThe build process and cross-buildThe build process and cross-buildtopic-JITtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@xhochy
xhochy
opened on Sep 3, 2025
Issue body actions

Bug report

Bug description:

For the last weeks, the MSVC installations on GitHub Actions and Azure Pipelines have also shipped their own version of LLVM tools. These don't match the ones requested in the CPython build. The MSVC activation scripts sadly put themselves in front of our local tools. While there is already code to handle the LLVM tools build via externals system on Windows or to look into the brew installation, there is no explicit override existing.

CPython versions tested on:

CPython main branch, 3.13, 3.14

Operating systems tested on:

Windows

Linked PRs

  • gh-138451: Support custom LLVM installation path #138452

Activity

  1. xhochy
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Sep 3, 2025
  2. StanFromIreland
    added
    topic-JIT
    buildThe build process and cross-buildThe build process and cross-build
    on Sep 3, 2025
  3. savannahostrowski
    added 3 commits that reference this issue on Apr 17, 2026

    Merge branch 'main' into pythongh-138451

    d5e2421

    Merge branch 'main' into pythongh-138451

    b3a330c

    gh-138451: Support custom LLVM installation path (#138452)

    5a3f479
  4. savannahostrowski
    closed this as completedin #138452on Apr 20, 2026
  5. ljfp
    added a commit that references this issue on Apr 25, 2026

    pythongh-138451: Support custom LLVM installation path (python#138452)

    8184a72
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    buildThe build process and cross-buildThe build process and cross-buildtopic-JITtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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