Enable outline-atomics by default on aarch64 Windows, Apple, FreeBSD, Android

Author: tgross35

compiler/rustc_target/src/spec/targets/aarch64_apple_ios.rs

@@ -16,7 +16,7 @@ pub(crate) fn target() -> Target {
             .into(),
         arch,
         options: TargetOptions {
-            features: "+neon,+fp-armv8,+apple-a7".into(),
+            features: "+neon,+fp-armv8,+apple-a7,+outline-atomics".into(),
             max_atomic_width: Some(128),
             supported_sanitizers: SanitizerSet::ADDRESS | SanitizerSet::THREAD,
             ..opts

compiler/rustc_target/src/spec/targets/aarch64_apple_tvos.rs

@@ -16,7 +16,7 @@ pub(crate) fn target() -> Target {
             .into(),
         arch,
         options: TargetOptions {
-            features: "+neon,+fp-armv8,+apple-a7".into(),
+            features: "+neon,+fp-armv8,+apple-a7,+outline-atomics".into(),
             max_atomic_width: Some(128),
             ..opts
         },

compiler/rustc_target/src/spec/targets/aarch64_apple_visionos.rs

@@ -16,7 +16,7 @@ pub(crate) fn target() -> Target {
             .into(),
         arch,
         options: TargetOptions {
-            features: "+neon,+fp-armv8,+apple-a16".into(),
+            features: "+neon,+fp-armv8,+apple-a16,+outline-atomics".into(),
             max_atomic_width: Some(128),
             supported_sanitizers: SanitizerSet::ADDRESS | SanitizerSet::THREAD,
             ..opts

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

@@ -16,7 +16,7 @@ pub(crate) fn target() -> Target {
             .into(),
         arch,
         options: TargetOptions {
-            features: "+v8a,+neon,+fp-armv8,+apple-a7".into(),
+            features: "+v8a,+neon,+fp-armv8,+apple-a7,+outline-atomics".into(),
             max_atomic_width: Some(128),
             dynamic_linking: false,
             position_independent_executables: true,

compiler/rustc_target/src/spec/targets/aarch64_linux_android.rs

@@ -21,7 +21,7 @@ pub(crate) fn target() -> Target {
             max_atomic_width: Some(128),
             // As documented in https://developer.android.com/ndk/guides/cpu-features.html
             // the neon (ASIMD) and FP must exist on all android aarch64 targets.
-            features: "+v8a,+neon,+fp-armv8".into(),
+            features: "+v8a,+neon,+fp-armv8,+outline-atomics".into(),
             // the AAPCS64 expects use of non-leaf frame pointers per
             // https://github.com/ARM-software/abi-aa/blob/4492d1570eb70c8fd146623e0db65b2d241f12e7/aapcs64/aapcs64.rst#the-frame-pointer
             // and we tend to encounter interesting bugs in AArch64 unwinding code if we do not

compiler/rustc_target/src/spec/targets/aarch64_pc_windows_gnullvm.rs

@@ -3,7 +3,7 @@ use crate::spec::{FramePointer, Target, TargetMetadata, base};
 pub(crate) fn target() -> Target {
     let mut base = base::windows_gnullvm::opts();
     base.max_atomic_width = Some(128);
-    base.features = "+v8a,+neon,+fp-armv8".into();
+    base.features = "+v8a,+neon,+fp-armv8,+outline-atomics".into();
     base.linker = Some("aarch64-w64-mingw32-clang".into());
 
     // Microsoft recommends enabling frame pointers on Arm64 Windows.

compiler/rustc_target/src/spec/targets/aarch64_pc_windows_msvc.rs

@@ -3,7 +3,7 @@ use crate::spec::{FramePointer, Target, TargetMetadata, base};
 pub(crate) fn target() -> Target {
     let mut base = base::windows_msvc::opts();
     base.max_atomic_width = Some(128);
-    base.features = "+v8a,+neon,+fp-armv8".into();
+    base.features = "+v8a,+neon,+fp-armv8,+outline-atomics".into();
 
     // Microsoft recommends enabling frame pointers on Arm64 Windows.
     // From https://learn.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=msvc-170#integer-registers

compiler/rustc_target/src/spec/targets/aarch64_unknown_freebsd.rs

@@ -13,7 +13,7 @@ pub(crate) fn target() -> Target {
         data_layout: "e-m:e-p270:32:32-p271:32:32-p272:64:64-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32".into(),
         arch: "aarch64".into(),
         options: TargetOptions {
-            features: "+v8a".into(),
+            features: "+v8a,+outline-atomics".into(),
             max_atomic_width: Some(128),
             stack_probes: StackProbeType::Inline,
             supported_sanitizers: SanitizerSet::ADDRESS