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This is more in-line with what Apple's tooling expects, and allows us to better support custom compiler drivers (such as certain Homebrew and Nixpkgs compilers) that prefer their own `-isysroot` flag. Effectively, we now invoke the compiler driver as-if it was invoked as `xcrun -sdk $sdk_name $tool`.
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.