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GeezerVison is showing github.com — Building with LTO and Clang 20 on Debian fails to link · Issue #161821 · python/cpython

Building with LTO and Clang 20 on Debian fails to link #161821

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Building with LTO and Clang 20 on Debian fails to link#161821
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buildThe build process and cross-buildThe build process and cross-buildtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@nascheme
nascheme
opened on Nov 11, 2026
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Bug report

Debian Trixie does not ship LLVMgold.so and if you configure CPython with "clang-20" and --with-lto, it will fail to link. You can explicitly tell Clang to use lld as the linker, which will work, if you install that package. I think configure should detect this situation and use lld.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

  • gh-161821: Fall back to lld for Clang LTO builds #161822

Activity

  1. nascheme
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Nov 11, 2026
  2. StanFromIreland
    added
    buildThe build process and cross-buildThe build process and cross-build
    on Nov 11, 2026
  3. nascheme
    added a commit that references this issue on Nov 11, 2026

    pythongh-161821: Fall back to lld for Clang LTO builds

    f74b453
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