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Allow bootstrap cache path to be set by environment variable - #116697

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jefferyto wants to merge 1 commit into
rust-lang:masterfrom
jefferyto:rustc-bootstrap-cache
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jefferyto wants to merge 1 commit into
rust-lang:masterfrom
jefferyto:rustc-bootstrap-cache

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This allows the bootstrap cache path to be set by the RUSTC_BOOTSTRAP_CACHE environment variable.

Setting the bootstrap cache path to an external location can help to speed up builds in cases where the build directory is not kept between builds, e.g. in CI or other automated build systems.

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S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

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