Rollup merge of rust-lang#103929 - BlackHoleFox:apple-targets-cleanup, r=petrochenkov

Cleanup Apple-related code in rustc_target

While working on rust-lang#103455, the consistency of the `rustc_target` code for Apple's platforms was "kind of bad." There were two "base" files (`apple_base.rs` and `apple_sdk_base.rs`) that the targets each pulled some parts out of, each and all of them were written slightly differently, and sometimes missed comments other implementations had.

So to hopefully make future maintenance, like implementing rust-lang/compiler-team#556, easier, this makes all of them use similar patterns and the same target base logic everywhere instead of picking bits from both. This also has some other smaller upsides like less stringly-typed functions.

Author: Manishearth

compiler/rustc_target/src/spec/aarch64_apple_darwin.rs

@@ -1,26 +1,25 @@
+use super::apple_base::{macos_link_env_remove, macos_llvm_target, opts, Arch};
 use crate::spec::{FramePointer, SanitizerSet, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let arch = "arm64";
-    let mut base = super::apple_base::opts("macos", arch, "");
+    let arch = Arch::Arm64;
+    let mut base = opts("macos", arch);
     base.cpu = "apple-a14".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;
 
-    base.link_env_remove.to_mut().extend(super::apple_base::macos_link_env_remove());
-
-    // Clang automatically chooses a more specific target based on
-    // MACOSX_DEPLOYMENT_TARGET.  To enable cross-language LTO to work
-    // correctly, we do too.
-    let llvm_target = super::apple_base::macos_llvm_target(arch);
+    base.link_env_remove.to_mut().extend(macos_link_env_remove());
 
     Target {
-        llvm_target: llvm_target.into(),
+        // 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: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             mcount: "\u{1}mcount".into(),
             frame_pointer: FramePointer::NonLeaf,

compiler/rustc_target/src/spec/aarch64_apple_ios.rs

@@ -1,19 +1,17 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{ios_llvm_target, opts, Arch};
 use crate::spec::{FramePointer, Target, TargetOptions};
 
 pub fn target() -> 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.
-    let arch = "arm64";
-    let llvm_target = super::apple_base::ios_llvm_target(arch);
-
+    let arch = Arch::Arm64;
     Target {
-        llvm_target: llvm_target.into(),
+        // 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: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
@@ -30,7 +28,7 @@ pub fn target() -> Target {
                 darwinpcs\0\
                 -Os\0"
                 .into(),
-            ..opts("ios", Arch::Arm64)
+            ..opts("ios", arch)
         },
     }
 }

compiler/rustc_target/src/spec/aarch64_apple_ios_macabi.rs

@@ -1,17 +1,18 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{Cc, FramePointer, LinkerFlavor, Lld, Target, TargetOptions};
 
 pub fn target() -> Target {
     let llvm_target = "arm64-apple-ios14.0-macabi";
 
-    let mut base = opts("ios", Arch::Arm64_macabi);
+    let arch = Arch::Arm64_macabi;
+    let mut base = opts("ios", arch);
     base.add_pre_link_args(LinkerFlavor::Darwin(Cc::Yes, Lld::No), &["-target", llvm_target]);
 
     Target {
         llvm_target: llvm_target.into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a12".into(),
             max_atomic_width: Some(128),

compiler/rustc_target/src/spec/aarch64_apple_ios_sim.rs

@@ -1,21 +1,17 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{ios_sim_llvm_target, opts, Arch};
 use crate::spec::{FramePointer, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("ios", Arch::Arm64_sim);
-
-    // Clang automatically chooses a more specific target based on
-    // IPHONEOS_DEPLOYMENT_TARGET.
-    // This is required for the simulator target to pick the right
-    // MACH-O commands, so we do too.
-    let arch = "arm64";
-    let llvm_target = super::apple_base::ios_sim_llvm_target(arch);
-
+    let arch = Arch::Arm64_sim;
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // IPHONEOS_DEPLOYMENT_TARGET.
+        // This is required for the simulator target to pick the right
+        // MACH-O commands, so we do too.
+        llvm_target: ios_sim_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
@@ -32,7 +28,7 @@ pub fn target() -> Target {
                 darwinpcs\0\
                 -Os\0"
                 .into(),
-            ..base
+            ..opts("ios", arch)
         },
     }
 }

compiler/rustc_target/src/spec/aarch64_apple_tvos.rs

@@ -1,18 +1,19 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, Arch};
 use crate::spec::{FramePointer, Target, TargetOptions};
 
 pub fn target() -> Target {
+    let arch = Arch::Arm64;
     Target {
         llvm_target: "arm64-apple-tvos".into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
             forces_embed_bitcode: true,
             frame_pointer: FramePointer::NonLeaf,
-            ..opts("tvos", Arch::Arm64)
+            ..opts("tvos", arch)
         },
     }
 }

compiler/rustc_target/src/spec/aarch64_apple_watchos_sim.rs

@@ -1,21 +1,17 @@
-use super::apple_sdk_base::{opts, Arch};
+use super::apple_base::{opts, watchos_sim_llvm_target, Arch};
 use crate::spec::{FramePointer, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = opts("watchos", Arch::Arm64_sim);
-
-    // Clang automatically chooses a more specific target based on
-    // WATCHOS_DEPLOYMENT_TARGET.
-    // This is required for the simulator target to pick the right
-    // MACH-O commands, so we do too.
-    let arch = "arm64";
-    let llvm_target = super::apple_base::watchos_sim_llvm_target(arch);
-
+    let arch = Arch::Arm64_sim;
     Target {
-        llvm_target: llvm_target.into(),
+        // Clang automatically chooses a more specific target based on
+        // WATCHOS_DEPLOYMENT_TARGET.
+        // This is required for the simulator target to pick the right
+        // MACH-O commands, so we do too.
+        llvm_target: watchos_sim_llvm_target(arch).into(),
         pointer_width: 64,
         data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
-        arch: "aarch64".into(),
+        arch: arch.target_arch(),
         options: TargetOptions {
             features: "+neon,+fp-armv8,+apple-a7".into(),
             max_atomic_width: Some(128),
@@ -32,7 +28,7 @@ pub fn target() -> Target {
                 darwinpcs\0\
                 -Os\0"
                 .into(),
-            ..base
+            ..opts("watchos", arch)
         },
     }
 }