Move Mach-O platform information to rustc_codegen_ssa::back::apple

To align with the general decision to have this sort of information
there instead.

Also use the visionOS values added in newer `object` release.

Author: madsmtm

compiler/rustc_codegen_ssa/src/back/apple.rs

@@ -7,6 +7,22 @@ use rustc_target::spec::Target;
 #[cfg(test)]
 mod tests;
 
+pub(crate) fn macho_platform(target: &Target) -> u32 {
+    match (&*target.os, &*target.abi) {
+        ("macos", _) => object::macho::PLATFORM_MACOS,
+        ("ios", "macabi") => object::macho::PLATFORM_MACCATALYST,
+        ("ios", "sim") => object::macho::PLATFORM_IOSSIMULATOR,
+        ("ios", _) => object::macho::PLATFORM_IOS,
+        ("watchos", "sim") => object::macho::PLATFORM_WATCHOSSIMULATOR,
+        ("watchos", _) => object::macho::PLATFORM_WATCHOS,
+        ("tvos", "sim") => object::macho::PLATFORM_TVOSSIMULATOR,
+        ("tvos", _) => object::macho::PLATFORM_TVOS,
+        ("visionos", "sim") => object::macho::PLATFORM_XROSSIMULATOR,
+        ("visionos", _) => object::macho::PLATFORM_XROS,
+        _ => unreachable!("tried to get Mach-O platform for non-Apple target"),
+    }
+}
+
 /// Deployment target or SDK version.
 ///
 /// The size of the numbers in here are limited by Mach-O's `LC_BUILD_VERSION`.

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -402,8 +402,7 @@ fn macho_object_build_version_for_target(sess: &Session) -> object::write::MachO
         (major << 16) | (minor << 8) | patch
     }
 
-    let platform =
-        rustc_target::spec::current_apple_platform(&sess.target).expect("unknown Apple target OS");
+    let platform = apple::macho_platform(&sess.target);
     let min_os = apple::deployment_target(sess);
 
     let mut build_version = object::write::MachOBuildVersion::default();

compiler/rustc_target/src/spec/base/apple/mod.rs

@@ -3,7 +3,7 @@ use std::env;
 
 use crate::spec::{
     Cc, DebuginfoKind, FramePointer, LinkerFlavor, Lld, SplitDebuginfo, StackProbeType, StaticCow,
-    Target, TargetOptions, cvs,
+    TargetOptions, cvs,
 };
 
 #[cfg(test)]
@@ -156,23 +156,6 @@ pub(crate) fn base(
     (opts, unversioned_llvm_target(os, arch, abi), arch.target_arch())
 }
 
-pub fn platform(target: &Target) -> Option<u32> {
-    Some(match (&*target.os, &*target.abi) {
-        ("macos", _) => object::macho::PLATFORM_MACOS,
-        ("ios", "macabi") => object::macho::PLATFORM_MACCATALYST,
-        ("ios", "sim") => object::macho::PLATFORM_IOSSIMULATOR,
-        ("ios", _) => object::macho::PLATFORM_IOS,
-        ("watchos", "sim") => object::macho::PLATFORM_WATCHOSSIMULATOR,
-        ("watchos", _) => object::macho::PLATFORM_WATCHOS,
-        ("tvos", "sim") => object::macho::PLATFORM_TVOSSIMULATOR,
-        ("tvos", _) => object::macho::PLATFORM_TVOS,
-        // FIXME: Upgrade to `object-rs` 0.33+ implementation with visionOS platform definition
-        ("visionos", "sim") => 12,
-        ("visionos", _) => 11,
-        _ => return None,
-    })
-}
-
 /// Generate part of the LLVM target triple.
 ///
 /// See `rustc_codegen_ssa::back::versioned_llvm_target` for the full triple passed to LLVM and

compiler/rustc_target/src/spec/mod.rs

@@ -59,7 +59,6 @@ pub mod abi;
 pub mod crt_objects;
 
 mod base;
-pub use base::apple::platform as current_apple_platform;
 pub use base::avr_gnu::ef_avr_arch;
 
 /// Linker is called through a C/C++ compiler.