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the `rust.lld` config enables rustc's `CFG_USE_SELF_CONTAINED_LINKER` env var, and we: - set the linker-flavor to use lld - enable the self-contained linker this makes the target use the rust-lld linker by default
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.