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chore: Update DEVELOPMENT.md with LLVM 21 setup instructions #2935

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aborgna-q merged 2 commits into from
Mar 16, 2026
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chore: Update DEVELOPMENT.md with LLVM 21 setup instructions #2935

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chore: Update DEVELOPMENT.md with LLVM 21 instructions
aborgna-q Mar 10, 2026
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aborgna-q Mar 16, 2026
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12 changes: 6 additions & 6 deletions DEVELOPMENT.md
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Original file line number Diff line number Diff line change
Expand Up @@ -34,8 +34,8 @@ To setup the environment manually you will need:
- uv `>=0.7`: <https://docs.astral.sh/uv/getting-started/installation>
- Optional: capnproto `>=1.0`: <https://capnproto.org/install.html>
Required when modifying the `hugr-model` serialization schema.
- Optional: llvm `== 14.0`. The "llvm" feature (backed by the sub-crate `hugr-llvm`)
requires LLVM installed. We use the rust bindings
- Optional: llvm `== 21.1`. The "llvm" feature (backed by the sub-crate `hugr-llvm`)
requires LLVM 21.0 installed. We use the rust bindings
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@acl-cqc acl-cqc Mar 16, 2026

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I think this should be 21.1?

[llvm-sys](https://crates.io/crates/llvm-sys) to [llvm](https://llvm.org/).
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@acl-cqc acl-cqc Mar 16, 2026

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Drive-by nit: this seems odd; surely it's the capital LLVM on the previous line that should be the link?


Once you have these installed, you can install the required python dependencies and setup pre-commit hooks with:
Expand All @@ -46,11 +46,11 @@ just setup

#### Note on LLVM

You will need llvm 14.0 installed in order for `just check` to run all its
You will need llvm 21.1 installed in order for `just check` to run all its
checks successfully. On Debian-based systems you can install it as the
`llvm-14` package; you will also need to install `libpolly14-dev`. You should
set the environment variable `LLVM_SYS_140_PREFIX` to point to its location
(e.g. `/usr/lib/llvm-14`) when running `just check`.
`llvm-21` package; you may also need to install `libpolly21-dev`. You should
set the environment variable `LLVM_SYS_211_PREFIX` to point to its location
(e.g. `/usr/lib/llvm-21`) when running `just check`.

## 🏃 Running the tests

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