Check AArch64 branch-protection earlier in the pipeline.

As suggested in #93516.

2 files changed, 3 insertions, 9 deletions

diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index 4dcc7cd5447..a22a67ad7d3 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -3,7 +3,6 @@ use crate::back::write::to_llvm_code_model;
 use crate::callee::get_fn;
 use crate::coverageinfo;
 use crate::debuginfo;
-use crate::errors::BranchProtectionRequiresAArch64;
 use crate::llvm;
 use crate::llvm_util;
 use crate::type_::Type;
@@ -275,10 +274,9 @@ pub unsafe fn create_module<'ll>(
         }
     }
 
-    if let Some(BranchProtection { bti, pac_ret }) = sess.opts.unstable_opts.branch_protection {
-        if sess.target.arch != "aarch64" {
-            sess.emit_err(BranchProtectionRequiresAArch64);
-        } else {
+    // AArch64-only options (checked in rustc_session).
+    if sess.target.arch == "aarch64" {
+        if let Some(BranchProtection { bti, pac_ret }) = sess.opts.unstable_opts.branch_protection {
             llvm::LLVMRustAddModuleFlag(
                 llmod,
                 llvm::LLVMModFlagBehavior::Error,
diff --git a/compiler/rustc_codegen_llvm/src/errors.rs b/compiler/rustc_codegen_llvm/src/errors.rs
index fddfbb23c67..de508f917f3 100644
--- a/compiler/rustc_codegen_llvm/src/errors.rs
+++ b/compiler/rustc_codegen_llvm/src/errors.rs
@@ -52,10 +52,6 @@ pub(crate) struct SymbolAlreadyDefined<'a> {
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_branch_protection_requires_aarch64)]
-pub(crate) struct BranchProtectionRequiresAArch64;
-
-#[derive(Diagnostic)]
 #[diag(codegen_llvm_invalid_minimum_alignment)]
 pub(crate) struct InvalidMinimumAlignment {
     pub err: String,