From 8c029d5f456775294204a8c28b24d6ba19865d79 Mon Sep 17 00:00:00 2001
From: cypherair <262752927+cypherair@users.noreply.github.com>
Date: Sat, 25 Apr 2026 15:46:42 -0700
Subject: [PATCH] arm64e: set ptrauth ABI subtype on rmeta Mach-O objects

Rust packs rlib metadata into a lib.rmeta archive member encoded as a Mach-O object.

For Apple arm64e, extend the existing metadata-object subtype special case from bare CPU_SUBTYPE_ARM64E to CPU_SUBTYPE_ARM64E | CPU_SUBTYPE_PTRAUTH_ABI.
---
 compiler/rustc_codegen_ssa/src/back/metadata.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_codegen_ssa/src/back/metadata.rs b/compiler/rustc_codegen_ssa/src/back/metadata.rs
index cb66dabf507a5..f3e28484bf11d 100644
--- a/compiler/rustc_codegen_ssa/src/back/metadata.rs
+++ b/compiler/rustc_codegen_ssa/src/back/metadata.rs
@@ -216,7 +216,9 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
     file.set_sub_architecture(sub_architecture);
     if sess.target.is_like_darwin {
         if macho_is_arm64e(&sess.target) {
-            file.set_macho_cpu_subtype(object::macho::CPU_SUBTYPE_ARM64E);
+            file.set_macho_cpu_subtype(
+                object::macho::CPU_SUBTYPE_ARM64E | object::macho::CPU_SUBTYPE_PTRAUTH_ABI,
+            );
         }
 
         file.set_macho_build_version(macho_object_build_version_for_target(sess))