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ci: Cache LLVM downloads separately - #42
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rust-cache made some changes (presumably [1]) that delete most non-Rust files before caching, including the LLVM source, but leave the directories. This causes `download-llvm.sh` to think the source exists and skip a re-download, but the build fails because the needed files are missing. It's not clear whether the download was being cached previously, or if rust-cache deleted the directories so it was always re-downloaded. Move the directory in CI and set up a separate cache step so rust-cache isn't responsible for these files anymore. [1]: Swatinem/rust-cache@3bf42ac
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rust-cache made some changes (presumably 1) that delete most non-Rust files before caching, including the LLVM source, but leave the directories. This causes
download-llvm.shto think the source exists and skip a re-download, but the build fails because the needed files are missing. It's not clear whether the download was being cached previously, or if rust-cache deleted the directories so it was always re-downloaded.Move the directory in CI and set up a separate cache step so rust-cache isn't responsible for these files anymore.