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Auto merge of #104385 - BlackHoleFox:apple-minimum-bumps, r=petrochenkov

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Raise minimum supported Apple OS versions

This implements the proposal to raise the minimum supported Apple OS versions as laid out in the now-completed MCP (https://github.com/rust-lang/compiler-team/issues/556).

As of this PR, rustc and the stdlib now support these versions as the baseline:
- macOS: 10.12 Sierra
- iOS: 10
- tvOS: 10
- watchOS: 5 (Unchanged)

In addition to everything this breaks indirectly, these changes also erase the `armv7-apple-ios` target (currently tier 3) because the oldest supported iOS device now uses ARMv7s. Not sure what the policy around tier3 target removal is but shimming it is not an option due to the linker refusing.

[Per comment](https://github.com/rust-lang/compiler-team/issues/556#issuecomment-1297175073), this requires a FCP to merge. cc `@wesleywiser.`
This commit is contained in:
bors 2023-09-24 02:35:05 +00:00
commit 42ca6e4e57
18 changed files with 49 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
.github/workflows/ci.yml vendored
View File

@ -305,7 +305,7 @@ jobs:
SCRIPT: "./x.py dist bootstrap --include-default-paths --host=x86_64-apple-darwin --target=x86_64-apple-darwin"
RUST_CONFIGURE_ARGS: "--enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false --set rust.lto=thin"
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.7
MACOSX_DEPLOYMENT_TARGET: 10.12
SELECT_XCODE: /Applications/Xcode_13.4.1.app
NO_LLVM_ASSERTIONS: 1
NO_DEBUG_ASSERTIONS: 1
@ -317,7 +317,7 @@ jobs:
SCRIPT: "./x.py dist bootstrap --include-default-paths --host='' --target=aarch64-apple-ios,x86_64-apple-ios,aarch64-apple-ios-sim"
RUST_CONFIGURE_ARGS: "--enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.7
MACOSX_DEPLOYMENT_TARGET: 10.12
SELECT_XCODE: /Applications/Xcode_13.4.1.app
NO_LLVM_ASSERTIONS: 1
NO_DEBUG_ASSERTIONS: 1
@ -328,8 +328,8 @@ jobs:
SCRIPT: "./x.py --stage 2 test --skip tests/ui --skip tests/rustdoc --skip tests/run-make-fulldeps"
RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.8
MACOSX_STD_DEPLOYMENT_TARGET: 10.7
MACOSX_DEPLOYMENT_TARGET: 10.12
MACOSX_STD_DEPLOYMENT_TARGET: 10.12
NO_LLVM_ASSERTIONS: 1
NO_DEBUG_ASSERTIONS: 1
NO_OVERFLOW_CHECKS: 1
@ -339,8 +339,8 @@ jobs:
SCRIPT: "./x.py --stage 2 test tests/ui tests/rustdoc tests/run-make-fulldeps"
RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.8
MACOSX_STD_DEPLOYMENT_TARGET: 10.7
MACOSX_DEPLOYMENT_TARGET: 10.12
MACOSX_STD_DEPLOYMENT_TARGET: 10.12
NO_LLVM_ASSERTIONS: 1
NO_DEBUG_ASSERTIONS: 1
NO_OVERFLOW_CHECKS: 1

56
compiler/rustc_target/src/spec/apple_base.rs
View File

@ -11,7 +11,6 @@ use Arch::*;
#[allow(non_camel_case_types)]
#[derive(Copy, Clone)]
pub enum Arch {
Armv7,
Armv7k,
Armv7s,
Arm64,
@ -29,7 +28,6 @@ pub enum Arch {
impl Arch {
pub fn target_name(self) -> &'static str {
match self {
Armv7 => "armv7",
Armv7k => "armv7k",
Armv7s => "armv7s",
Arm64 | Arm64_macabi | Arm64_sim => "arm64",
@ -43,7 +41,7 @@ impl Arch {
pub fn target_arch(self) -> Cow<'static, str> {
Cow::Borrowed(match self {
Armv7 | Armv7k | Armv7s => "arm",
Armv7k | Armv7s => "arm",
Arm64 | Arm64_32 | Arm64_macabi | Arm64_sim => "aarch64",
I386 | I686 => "x86",
X86_64 | X86_64_sim | X86_64_macabi | X86_64h => "x86_64",
@ -52,7 +50,7 @@ impl Arch {
fn target_abi(self) -> &'static str {
match self {
Armv7 | Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | I686 | X86_64 | X86_64h => "",
Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | I686 | X86_64 | X86_64h => "",
X86_64_macabi | Arm64_macabi => "macabi",
// x86_64-apple-ios is a simulator target, even though it isn't
// declared that way in the target like the other ones...
@ -62,18 +60,20 @@ impl Arch {
fn target_cpu(self) -> &'static str {
match self {
Armv7 => "cortex-a8", // iOS7 is supported on iPhone 4 and higher
Armv7k => "cortex-a8",
Armv7s => "cortex-a9",
Armv7s => "swift", // iOS 10 is only supported on iPhone 5 or higher.
Arm64 => "apple-a7",
Arm64_32 => "apple-s4",
I386 | I686 => "yonah",
X86_64 | X86_64_sim => "core2",
// Only macOS 10.12+ is supported, which means
// all x86_64/x86 CPUs must be running at least penryn
// https://github.com/llvm/llvm-project/blob/01f924d0e37a5deae51df0d77e10a15b63aa0c0f/clang/lib/Driver/ToolChains/Arch/X86.cpp#L79-L82
I386 | I686 => "penryn",
X86_64 | X86_64_sim => "penryn",
X86_64_macabi => "penryn",
// Note: `core-avx2` is slightly more advanced than `x86_64h`, see
// comments (and disabled features) in `x86_64h_apple_darwin` for
// details.
// details. It is a higher baseline then `penryn` however.
X86_64h => "core-avx2",
X86_64_macabi => "core2",
Arm64_macabi => "apple-a12",
Arm64_sim => "apple-a12",
}
@ -115,21 +115,6 @@ fn pre_link_args(os: &'static str, arch: Arch, abi: &'static str) -> LinkArgs {
}
pub fn opts(os: &'static str, arch: Arch) -> TargetOptions {
// Static TLS is only available in macOS 10.7+. If you try to compile for 10.6
// either the linker will complain if it is used or the binary will end up
// segfaulting at runtime when run on 10.6. Rust by default supports macOS
// 10.7+, but there is a standard environment variable,
// MACOSX_DEPLOYMENT_TARGET, which is used to signal targeting older
// versions of macOS. For example compiling on 10.10 with
// MACOSX_DEPLOYMENT_TARGET set to 10.6 will cause the linker to generate
// warnings about the usage of static TLS.
//
// Here we detect what version is being requested, defaulting to 10.7. Static
// TLS is flagged as enabled if it looks to be supported. The architecture
// only matters for default deployment target which is 11.0 for ARM64 and
// 10.7 for everything else.
let has_thread_local = os == "macos" && macos_deployment_target(Arch::X86_64) >= (10, 7);
let abi = arch.target_abi();
TargetOptions {
@ -145,12 +130,17 @@ pub fn opts(os: &'static str, arch: Arch) -> TargetOptions {
pre_link_args: pre_link_args(os, arch, abi),
families: cvs!["unix"],
is_like_osx: true,
default_dwarf_version: 2,
// LLVM notes that macOS 10.11+ and iOS 9+ default
// to v4, so we do the same.
// https://github.com/llvm/llvm-project/blob/378778a0d10c2f8d5df8ceff81f95b6002984a4b/clang/lib/Driver/ToolChains/Darwin.cpp#L1203
default_dwarf_version: 4,
frame_pointer: FramePointer::Always,
has_rpath: true,
dll_suffix: ".dylib".into(),
archive_format: "darwin".into(),
has_thread_local,
// Thread locals became available with iOS 8 and macOS 10.7,
// and both are far below our minimum.
has_thread_local: true,
abi_return_struct_as_int: true,
emit_debug_gdb_scripts: false,
eh_frame_header: false,
@ -239,9 +229,7 @@ fn macos_default_deployment_target(arch: Arch) -> (u32, u32) {
match arch {
// Note: Arm64_sim is not included since macOS has no simulator.
Arm64 | Arm64_macabi => (11, 0),
// x86_64h-apple-darwin only supports macOS 10.8 and later
X86_64h => (10, 8),
_ => (10, 7),
_ => (10, 12),
}
}
@ -292,8 +280,8 @@ fn link_env_remove(arch: Arch, os: &'static str) -> StaticCow<[StaticCow<str>]>
// Otherwise if cross-compiling for a different OS/SDK, remove any part
// of the linking environment that's wrong and reversed.
match arch {
Armv7 | Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | I686 | X86_64 | X86_64_sim
| X86_64h | Arm64_sim => {
Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | I686 | X86_64 | X86_64_sim | X86_64h
| Arm64_sim => {
cvs!["MACOSX_DEPLOYMENT_TARGET"]
}
X86_64_macabi | Arm64_macabi => cvs!["IPHONEOS_DEPLOYMENT_TARGET"],
@ -303,7 +291,7 @@ fn link_env_remove(arch: Arch, os: &'static str) -> StaticCow<[StaticCow<str>]>
fn ios_deployment_target() -> (u32, u32) {
// If you are looking for the default deployment target, prefer `rustc --print deployment-target`.
from_set_deployment_target("IPHONEOS_DEPLOYMENT_TARGET").unwrap_or((7, 0))
from_set_deployment_target("IPHONEOS_DEPLOYMENT_TARGET").unwrap_or((10, 0))
}
fn mac_catalyst_deployment_target() -> (u32, u32) {
@ -334,7 +322,7 @@ pub fn ios_sim_llvm_target(arch: Arch) -> String {
fn tvos_deployment_target() -> (u32, u32) {
// If you are looking for the default deployment target, prefer `rustc --print deployment-target`.
from_set_deployment_target("TVOS_DEPLOYMENT_TARGET").unwrap_or((7, 0))
from_set_deployment_target("TVOS_DEPLOYMENT_TARGET").unwrap_or((10, 0))
}
fn tvos_lld_platform_version() -> String {

21
compiler/rustc_target/src/spec/armv7_apple_ios.rs
View File

@ -1,21 +0,0 @@
use super::apple_base::{ios_llvm_target, opts, Arch};
use crate::spec::{Target, TargetOptions};
pub fn target() -> Target {
let arch = Arch::Armv7;
Target {
// Clang automatically chooses a more specific target based on
// IPHONEOS_DEPLOYMENT_TARGET.
// This is required for the target to pick the right
// MACH-O commands, so we do too.
llvm_target: ios_llvm_target(arch).into(),
pointer_width: 32,
data_layout: "e-m:o-p:32:32-Fi8-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32".into(),
arch: arch.target_arch(),
options: TargetOptions {
features: "+v7,+vfp3,+neon".into(),
max_atomic_width: Some(64),
..opts("ios", arch)
},
}
}

4
compiler/rustc_target/src/spec/armv7s_apple_ios.rs
View File

@ -1,10 +1,10 @@
use super::apple_base::{opts, Arch};
use super::apple_base::{ios_llvm_target, opts, Arch};
use crate::spec::{Target, TargetOptions};
pub fn target() -> Target {
let arch = Arch::Armv7s;
Target {
llvm_target: "armv7s-apple-ios".into(),
llvm_target: ios_llvm_target(arch).into(),
pointer_width: 32,
data_layout: "e-m:o-p:32:32-Fi8-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32".into(),
arch: arch.target_arch(),

1
compiler/rustc_target/src/spec/mod.rs
View File

@ -1394,7 +1394,6 @@ supported_targets! {
("i386-apple-ios", i386_apple_ios),
("x86_64-apple-ios", x86_64_apple_ios),
("aarch64-apple-ios", aarch64_apple_ios),
("armv7-apple-ios", armv7_apple_ios),
("armv7s-apple-ios", armv7s_apple_ios),
("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
("aarch64-apple-ios-macabi", aarch64_apple_ios_macabi),

2
compiler/rustc_target/src/spec/x86_64_apple_darwin.rs
View File

@ -5,7 +5,7 @@ use crate::spec::{StackProbeType, Target, TargetOptions};
pub fn target() -> Target {
let arch = Arch::X86_64;
let mut base = opts("macos", arch);
base.max_atomic_width = Some(128); // core2 supports cmpxchg16b
base.max_atomic_width = Some(128); // penryn+ supports cmpxchg16b
base.frame_pointer = FramePointer::Always;
base.add_pre_link_args(LinkerFlavor::Darwin(Cc::Yes, Lld::No), &["-m64"]);
base.stack_probes = StackProbeType::X86;

2
library/std/src/sys/unix/thread_local_dtor.rs
View File

@ -48,7 +48,7 @@ pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
// workaround below is to register, via _tlv_atexit, a custom DTOR list once per
// thread. thread_local dtors are pushed to the DTOR list without calling
// _tlv_atexit.
#[cfg(target_os = "macos")]
#[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
use crate::cell::Cell;
use crate::mem;

3
library/std/src/sys/unix/thread_parking/darwin.rs
View File

@ -2,8 +2,7 @@
//!
//! Darwin actually has futex syscalls (`__ulock_wait`/`__ulock_wake`), but they
//! cannot be used in `std` because they are non-public (their use will lead to
//! rejection from the App Store) and because they are only available starting
//! with macOS version 10.12, even though the minimum target version is 10.7.
//! rejection from the App Store).
//!
//! Therefore, we need to look for other synchronization primitives. Luckily, Darwin
//! supports semaphores, which allow us to implement the behaviour we need with

9
src/bootstrap/llvm.rs
View File

@ -703,14 +703,7 @@ fn configure_cmake(
cflags.push(" ");
cflags.push(s);
}
// Some compiler features used by LLVM (such as thread locals) will not work on a min version below iOS 10.
if target.contains("apple-ios") {
if target.contains("86-") {
cflags.push(" -miphonesimulator-version-min=10.0");
} else {
cflags.push(" -miphoneos-version-min=10.0");
}
}
if builder.config.llvm_clang_cl.is_some() {
cflags.push(&format!(" --target={target}"));
}

8
src/ci/github-actions/ci.yml
View File

@ -484,7 +484,7 @@ jobs:
SCRIPT: ./x.py dist bootstrap --include-default-paths --host=x86_64-apple-darwin --target=x86_64-apple-darwin
RUST_CONFIGURE_ARGS: --enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false --set rust.lto=thin
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.7
MACOSX_DEPLOYMENT_TARGET: 10.12
SELECT_XCODE: /Applications/Xcode_13.4.1.app
NO_LLVM_ASSERTIONS: 1
NO_DEBUG_ASSERTIONS: 1
@ -497,7 +497,7 @@ jobs:
SCRIPT: ./x.py dist bootstrap --include-default-paths --host='' --target=aarch64-apple-ios,x86_64-apple-ios,aarch64-apple-ios-sim
RUST_CONFIGURE_ARGS: --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.7
MACOSX_DEPLOYMENT_TARGET: 10.12
SELECT_XCODE: /Applications/Xcode_13.4.1.app
NO_LLVM_ASSERTIONS: 1
NO_DEBUG_ASSERTIONS: 1
@ -509,8 +509,8 @@ jobs:
SCRIPT: ./x.py --stage 2 test --skip tests/ui --skip tests/rustdoc --skip tests/run-make-fulldeps
RUST_CONFIGURE_ARGS: --build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.8
MACOSX_STD_DEPLOYMENT_TARGET: 10.7
MACOSX_DEPLOYMENT_TARGET: 10.12
MACOSX_STD_DEPLOYMENT_TARGET: 10.12
NO_LLVM_ASSERTIONS: 1
NO_DEBUG_ASSERTIONS: 1
NO_OVERFLOW_CHECKS: 1

5
src/doc/rustc/src/platform-support.md
View File

@ -36,7 +36,7 @@ target | notes
`i686-pc-windows-gnu` | 32-bit MinGW (Windows 7+) [^windows-support]
`i686-pc-windows-msvc` | 32-bit MSVC (Windows 7+) [^windows-support]
`i686-unknown-linux-gnu` | 32-bit Linux (kernel 3.2+, glibc 2.17+)
`x86_64-apple-darwin` | 64-bit macOS (10.7+, Lion+)
`x86_64-apple-darwin` | 64-bit macOS (10.12+, Sierra+)
`x86_64-pc-windows-gnu` | 64-bit MinGW (Windows 7+) [^windows-support]
`x86_64-pc-windows-msvc` | 64-bit MSVC (Windows 7+) [^windows-support]
`x86_64-unknown-linux-gnu` | 64-bit Linux (kernel 3.2+, glibc 2.17+)
@ -245,7 +245,6 @@ target | std | host | notes
`armv6-unknown-freebsd` | ✓ | ✓ | ARMv6 FreeBSD
[`armv6-unknown-netbsd-eabihf`](platform-support/netbsd.md) | ✓ | ✓ | ARMv6 NetBSD w/hard-float
[`armv6k-nintendo-3ds`](platform-support/armv6k-nintendo-3ds.md) | ? | | ARMv6K Nintendo 3DS, Horizon (Requires devkitARM toolchain)
`armv7-apple-ios` | ✓ | | ARMv7-A Cortex-A8 iOS
[`armv7-sony-vita-newlibeabihf`](platform-support/armv7-sony-vita-newlibeabihf.md) | ? | | ARMv7-A Cortex-A9 Sony PlayStation Vita (requires VITASDK toolchain)
[`armv7-unknown-linux-ohos`](platform-support/openharmony.md) | ✓ | | ARMv7-A OpenHarmony |
[`armv7-unknown-linux-uclibceabi`](platform-support/armv7-unknown-linux-uclibceabi.md) | ✓ | ✓ | ARMv7-A Linux with uClibc, softfloat
@ -265,7 +264,7 @@ target | std | host | notes
`hexagon-unknown-linux-musl` | ? | |
`i386-apple-ios` | ✓ | | 32-bit x86 iOS
[`i586-pc-nto-qnx700`](platform-support/nto-qnx.md) | * | | 32-bit x86 QNX Neutrino 7.0 RTOS |
`i686-apple-darwin` | ✓ | ✓ | 32-bit macOS (10.7+, Lion+)
`i686-apple-darwin` | ✓ | ✓ | 32-bit macOS (10.12+, Sierra+)
`i686-pc-windows-msvc` | * | | 32-bit Windows XP support
[`i686-pc-windows-gnullvm`](platform-support/pc-windows-gnullvm.md) | ✓ | ✓ |
`i686-unknown-haiku` | ✓ | ✓ | 32-bit Haiku

2
src/etc/installer/pkg/Distribution.xml
View File

@ -7,7 +7,7 @@
<domains enable_anywhere="false" enable_currentUserHome="false" enable_localSystem="true" />
<volume-check>
<allowed-os-versions>
<os-version min="10.7"/>
<os-version min="10.12"/>
</allowed-os-versions>
</volume-check>
<choices-outline>

1
src/tools/build-manifest/src/main.rs
View File

@ -69,7 +69,6 @@ static TARGETS: &[&str] = &[
"arm-unknown-linux-musleabihf",
"armv5te-unknown-linux-gnueabi",
"armv5te-unknown-linux-musleabi",
"armv7-apple-ios",
"armv7-linux-androideabi",
"thumbv7neon-linux-androideabi",
"armv7-unknown-linux-gnueabi",

4
tests/codegen/macos/i686-macosx-deployment-target.rs
View File

@ -4,7 +4,7 @@
// compile-flags: -O --target=i686-apple-darwin --crate-type=rlib
// needs-llvm-components: x86
// rustc-env:MACOSX_DEPLOYMENT_TARGET=10.9
// rustc-env:MACOSX_DEPLOYMENT_TARGET=10.14
#![feature(no_core, lang_items)]
#![no_core]
@ -20,7 +20,7 @@ pub struct Bool {
b: bool,
}
// CHECK: target triple = "i686-apple-macosx10.9.0"
// CHECK: target triple = "i686-apple-macosx10.14.0"
#[no_mangle]
pub extern "C" fn structbool() -> Bool {
Bool { b: true }

2
tests/codegen/macos/i686-no-macosx-deployment-target.rs
View File

@ -20,7 +20,7 @@ pub struct Bool {
b: bool,
}
// CHECK: target triple = "i686-apple-macosx10.7.0"
// CHECK: target triple = "i686-apple-macosx10.12.0"
#[no_mangle]
pub extern "C" fn structbool() -> Bool {
Bool { b: true }

4
tests/codegen/macos/x86_64-macosx-deployment-target.rs
View File

@ -4,7 +4,7 @@
// compile-flags: -O --target=x86_64-apple-darwin --crate-type=rlib
// needs-llvm-components: x86
// rustc-env:MACOSX_DEPLOYMENT_TARGET=10.9
// rustc-env:MACOSX_DEPLOYMENT_TARGET=10.14
#![feature(no_core, lang_items)]
#![no_core]
@ -20,7 +20,7 @@ pub struct Bool {
b: bool,
}
// CHECK: target triple = "x86_64-apple-macosx10.9.0"
// CHECK: target triple = "x86_64-apple-macosx10.14.0"
#[no_mangle]
pub extern "C" fn structbool() -> Bool {
Bool { b: true }

2
tests/codegen/macos/x86_64-no-macosx-deployment-target.rs
View File

@ -20,7 +20,7 @@ pub struct Bool {
b: bool,
}
// CHECK: target triple = "x86_64-apple-macosx10.7.0"
// CHECK: target triple = "x86_64-apple-macosx10.12.0"
#[no_mangle]
pub extern "C" fn structbool() -> Bool {
Bool { b: true }

4
tests/run-make/macos-deployment-target/Makefile
View File

@ -9,12 +9,12 @@ include ../tools.mk
ifeq ($(strip $(shell uname -m)),arm64)
GREP_PATTERN = "minos 11.0"
else
GREP_PATTERN = "version 10.9"
GREP_PATTERN = "version 10.13"
endif
OUT_FILE=$(TMPDIR)/with_deployment_target.dylib
all:
env MACOSX_DEPLOYMENT_TARGET=10.9 $(RUSTC) with_deployment_target.rs -o $(OUT_FILE)
env MACOSX_DEPLOYMENT_TARGET=10.13 $(RUSTC) with_deployment_target.rs -o $(OUT_FILE)
# XXX: The check is for either the x86_64 minimum OR the aarch64 minimum (M1 starts at macOS 11).
# They also use different load commands, so we let that change with each too. The aarch64 check
# isn't as robust as the x86 one, but testing both seems unneeded.