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tshepang merged 1 commit into from
Mar 9, 2026
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document that older LLVM versions come with increased risk #2793

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5 changes: 4 additions & 1 deletion src/backend/updating-llvm.md
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Expand Up @@ -6,7 +6,10 @@ Rust supports building against multiple LLVM versions:
* Tip-of-tree for the current LLVM development branch is usually supported within a few days.
PRs for such fixes are tagged with `llvm-main`.
* The latest released major version is always supported.
* The one or two preceding major versions are usually supported.
* The one or two preceding major versions are usually supported in the sense that they are expected
to build successfully and pass most tests. However, fixes for miscompilations often do not get
backported to past LLVM versions, so using rustc with older versions of LLVM comes with an
increased risk of soundness bugs. We strongly recommend using the latest version of LLVM.

By default, Rust uses its own fork in the [rust-lang/llvm-project repository].
This fork is based on a `release/$N.x` branch of the upstream project, where
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