Add new tier 3 aarch64-apple-watchos target

compiler/rustc_target/src/spec/mod.rs

@@ -1578,6 +1578,7 @@ fn $module() {
     ("armv7k-apple-watchos", armv7k_apple_watchos),
     ("arm64_32-apple-watchos", arm64_32_apple_watchos),
     ("x86_64-apple-watchos-sim", x86_64_apple_watchos_sim),
+    ("aarch64-apple-watchos", aarch64_apple_watchos),
     ("aarch64-apple-watchos-sim", aarch64_apple_watchos_sim),
 
     ("armebv7r-none-eabi", armebv7r_none_eabi),

compiler/rustc_target/src/spec/targets/aarch64_apple_watchos.rs

@@ -0,0 +1,19 @@
+use crate::spec::base::apple::{opts, Arch};
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    let base = opts("watchos", Arch::Arm64);
+    Target {
+        llvm_target: "aarch-apple-watchos".into(),
+        pointer_width: 64,
+        data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
+        arch: "aarch64".into(),
+        options: TargetOptions {
+            features: "+v8a,+neon,+fp-armv8,+apple-a7".into(),
+            max_atomic_width: Some(128),
+            dynamic_linking: false,
+            position_independent_executables: true,
+            ..base
+        },
+    }
+}

src/doc/rustc/src/platform-support.md

@@ -220,6 +220,7 @@ target | std | host | notes
 `aarch64-apple-ios-macabi` | ? |  | Apple Catalyst on ARM64
 [`aarch64-apple-tvos`](platform-support/apple-tvos.md) | ? |  | ARM64 tvOS
 [`aarch64-apple-tvos-sim`](platform-support/apple-tvos.md) | ? |  | ARM64 tvOS Simulator
+[`aarch64-apple-watchos`](platform-support/apple-watchos.md) | ✓ |  | ARM64 Apple WatchOS
 [`aarch64-apple-watchos-sim`](platform-support/apple-watchos.md) | ✓ |  | ARM64 Apple WatchOS Simulator
 [`aarch64-kmc-solid_asp3`](platform-support/kmc-solid.md) | ✓ |  | ARM64 SOLID with TOPPERS/ASP3
 [`aarch64-nintendo-switch-freestanding`](platform-support/aarch64-nintendo-switch-freestanding.md) | * |  | ARM64 Nintendo Switch, Horizon

src/doc/rustc/src/platform-support/apple-watchos.md

@@ -1,6 +1,7 @@
 # *-apple-watchos
 - arm64_32-apple-watchos
 - armv7k-apple-watchos
+- aarch64-apple-watchos
 - aarch64-apple-watchos-sim
 - x86_64-apple-watchos-sim
 
@@ -9,6 +10,7 @@
 Apple WatchOS targets:
 - Apple WatchOS on Arm 64_32
 - Apple WatchOS on Arm v7k
+- Apple WatchOS on Arm 64
 - Apple WatchOS Simulator on arm64
 - Apple WatchOS Simulator on x86_64
 
@@ -16,6 +18,7 @@ Apple WatchOS targets:
 
 * [@deg4uss3r](https://github.com/deg4uss3r)
 * [@vladimir-ea](https://github.com/vladimir-ea)
+* [@leohowell](https://github.com/leohowell)
 
 ## Requirements