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Make Enzyme has dependent on LLVM hash #153671

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Merged
rust-bors merged 1 commit into from
Mar 12, 2026
Merged

Make Enzyme has dependent on LLVM hash #153671

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8 changes: 7 additions & 1 deletion src/bootstrap/src/core/build_steps/llvm.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1151,12 +1151,18 @@ impl Step for Enzyme {

let LlvmResult { host_llvm_config, llvm_cmake_dir } = builder.ensure(Llvm { target });

// Enzyme links against LLVM. If we update the LLVM submodule libLLVM might get a new
// version number, in which case Enzyme will now fail to find LLVM. By including the LLVM
// hash into the Enzyme hash we force a rebuild of Enzyme when updating LLVM.
let enzyme_hash_input = builder.in_tree_llvm_info.sha().unwrap_or_default().to_owned()
+ builder.enzyme_info.sha().unwrap_or_default();

static STAMP_HASH_MEMO: OnceLock<String> = OnceLock::new();
let smart_stamp_hash = STAMP_HASH_MEMO.get_or_init(|| {
generate_smart_stamp_hash(
builder,
&builder.config.src.join("src/tools/enzyme"),
builder.enzyme_info.sha().unwrap_or_default(),
&enzyme_hash_input,
)
});

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