2 files changed, 11 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs
index 7ef3b12cd08..43e49bbeca9 100644
--- a/compiler/rustc_codegen_llvm/src/back/write.rs
+++ b/compiler/rustc_codegen_llvm/src/back/write.rs
@@ -523,6 +523,12 @@ pub(crate) unsafe fn optimize(
     let module_name = module.name.clone();
     let module_name = Some(&module_name[..]);
 
+    if let Some(false) = config.new_llvm_pass_manager && llvm_util::get_version() >= (15, 0, 0) {
+        diag_handler.warn(
+            "ignoring `-Z new-llvm-pass-manager=no`, which is no longer supported with LLVM 15",
+        );
+    }
+
     if config.emit_no_opt_bc {
         let out = cgcx.output_filenames.temp_path_ext("no-opt.bc", module_name);
         let out = path_to_c_string(&out);
diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs
index c24e369ae72..7b407c94e7b 100644
--- a/compiler/rustc_codegen_llvm/src/llvm_util.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm_util.rs
@@ -542,6 +542,11 @@ pub(crate) fn should_use_new_llvm_pass_manager(user_opt: &Option<bool>, target_a
     // The new pass manager is enabled by default for LLVM >= 13.
     // This matches Clang, which also enables it since Clang 13.
 
+    // Since LLVM 15, the legacy pass manager is no longer supported.
+    if llvm_util::get_version() >= (15, 0, 0) {
+        return true;
+    }
+
     // There are some perf issues with the new pass manager when targeting
     // s390x with LLVM 13, so enable the new pass manager only with LLVM 14.
     // See https://github.com/rust-lang/rust/issues/89609.