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Majority of targets use "unknown" vendor and changing it from "unknown" to omitted doesn't make sense. From the LLVM docs (https://clang.llvm.org/docs/CrossCompilation.html#target-triple): >Most of the time it can be omitted (and Unknown) will be assumed, which sets the defaults for the specified architecture. >When a parameter is not important, it can be omitted, or you can choose unknown and the defaults will be used. If you choose a parameter that Clang doesn’t know, like blerg, it’ll ignore and assume unknown
librustc_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.