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The expected value is "<arch>-apple-watchos<major>.<minor>.0", i.e. "arm64_32-apple-watchos8.0.0". compiler/rustc_target/src/spec/base/apple/mod.rs contains functions that construct such string. There is an existing function `watchos_sim_llvm_target` which returns llvm target value for watchOS simulator. But there is none for watchOS device. This commit adds that missing function to align watchOS with other Apple platform targets.
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.