Add arm64e-apple-darwin target

compiler/rustc_target/src/spec/mod.rs

@@ -1544,6 +1544,7 @@ supported_targets! {
     ("i686-unknown-hurd-gnu", i686_unknown_hurd_gnu),
 
     ("aarch64-apple-darwin", aarch64_apple_darwin),
+    ("arm64e-apple-darwin", arm64e_apple_darwin),
     ("x86_64-apple-darwin", x86_64_apple_darwin),
     ("x86_64h-apple-darwin", x86_64h_apple_darwin),
     ("i686-apple-darwin", i686_apple_darwin),

compiler/rustc_target/src/spec/targets/arm64e_apple_darwin.rs

@@ -0,0 +1,27 @@
+use crate::spec::base::apple::{macos_llvm_target, opts, Arch};
+use crate::spec::{FramePointer, SanitizerSet, Target, TargetOptions};
+
+pub fn target() -> Target {
+    let arch = Arch::Arm64e;
+    let mut base = opts("macos", arch);
+    base.cpu = "apple-m1".into();
+    base.max_atomic_width = Some(128);
+
+    // FIXME: The leak sanitizer currently fails the tests, see #88132.
+    base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::THREAD;
+
+    Target {
+        // Clang automatically chooses a more specific target based on
+        // MACOSX_DEPLOYMENT_TARGET. To enable cross-language LTO to work
+        // correctly, we do too.
+        llvm_target: macos_llvm_target(arch).into(),
+        pointer_width: 64,
+        data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
+        arch: arch.target_arch(),
+        options: TargetOptions {
+            mcount: "\u{1}mcount".into(),
+            frame_pointer: FramePointer::NonLeaf,
+            ..base
+        },
+    }
+}

src/doc/rustc/src/SUMMARY.md

@@ -16,6 +16,7 @@
     - [Target Tier Policy](target-tier-policy.md)
     - [Template for Target-specific Documentation](platform-support/TEMPLATE.md)
     - [arm64e-apple-ios.md](platform-support/arm64e-apple-ios.md)
+    - [arm64e-apple-darwin.md](platform-support/arm64e-apple-darwin.md)
     - [aarch64-apple-ios-sim](platform-support/aarch64-apple-ios-sim.md)
     - [\*-apple-tvos](platform-support/apple-tvos.md)
     - [\*-apple-watchos\*](platform-support/apple-watchos.md)

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

@@ -217,6 +217,7 @@ host tools.
 target | std | host | notes
 -------|:---:|:----:|-------
 [`arm64e-apple-ios`](platform-support/arm64e-apple-ios.md) | ✓ | | ARM64e Apple iOS
+[`arm64e-apple-darwin`](platform-support/arm64e-apple-darwin.md)  | ✓ | ✓ | ARM64e Apple Darwin
 `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

src/doc/rustc/src/platform-support/arm64e-apple-darwin.md

@@ -0,0 +1,36 @@
+# `arm64e-apple-darwin`
+
+**Tier: 3 (with Host Tools)**
+
+ARM64e macOS (11.0+, Big Sur+)
+
+## Target maintainers
+
+- Artyom Tetyukhin ([@arttet](https://github.com/https://github.com/arttet))
+
+## Requirements
+
+Target for `macOS` on late-generation `M` series Apple chips.
+
+## Building the target
+
+You can build Rust with support for the targets by adding it to the `target` list in `config.toml`:
+
+```toml
+[build]
+target = [ "arm64e-apple-darwin" ]
+```
+
+## Building Rust programs
+
+Rust does not yet ship pre-compiled artifacts for this target.
+To compile for this target, you will need to build Rust with the target enabled (see [Building the target](#building-the-target) above).
+
+## Testing
+
+The target does support running binaries on macOS platforms with `arm64e` architecture.
+
+## Cross-compilation toolchains and C code
+
+The targets do support `C` code.
+To build compatible `C` code, you have to use XCode with the same compiler and flags.

src/tools/build-manifest/src/main.rs

@@ -50,6 +50,7 @@ static HOSTS: &[&str] = &[
 
 static TARGETS: &[&str] = &[
     "aarch64-apple-darwin",
+    "arm64e-apple-darwin",
     "aarch64-apple-ios",
     "arm64e-apple-ios",
     "aarch64-apple-ios-sim",