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docs: say the image's older LLVM majors were for the ClickHouse fork only #522

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catinspace-au merged 1 commit into from
Oct 6, 2026
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docs: say the image's older LLVM majors were for the ClickHouse fork only #522

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4 changes: 4 additions & 0 deletions docs/languages/rust-llvm.md
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Expand Up @@ -20,6 +20,10 @@ Every Rust build links with `ld.lld` and, on a Tier 2 release, rewrites the bina

`llvm-profdata` is the exception: it comes from the rustc sysroot (`llvm-tools-preview`), so the profile is merged by the LLVM that wrote it.

## Older majors on the runner image

The ARC image has carried LLVM 19, 20, 21 and 22 beside the default, and its unversioned `clang` and `ld.lld` used to point at 19. That was ONLY for the ClickHouse server fork's C++ build (LLVM 19 for ClickHouse OSS compatibility, 21 for the fork's own CI). It was never a Rust default, and the fork is no longer built. Don't read a leftover major on a runner as a requirement: the only default is `versions.yaml` `llvm`. The image is being trimmed to that one major (#519).

## Choosing the major

Highest wins:
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