diff --git a/compiler/rustc_codegen_llvm/src/lib.rs b/compiler/rustc_codegen_llvm/src/lib.rs
index bb264db22d9..a1b1dcb1278 100644
--- a/compiler/rustc_codegen_llvm/src/lib.rs
+++ b/compiler/rustc_codegen_llvm/src/lib.rs
@@ -141,18 +141,6 @@ fn target_machine_factory(
         back::write::target_machine_factory(sess, optlvl, target_features)
     }
 
-    fn spawn_thread<F, T>(time_trace: bool, f: F) -> std::thread::JoinHandle<T>
-    where
-        F: FnOnce() -> T,
-        F: Send + 'static,
-        T: Send + 'static,
-    {
-        std::thread::spawn(move || {
-            let _profiler = TimeTraceProfiler::new(time_trace);
-            f()
-        })
-    }
-
     fn spawn_named_thread<F, T>(
         time_trace: bool,
         name: String,
diff --git a/compiler/rustc_codegen_ssa/src/traits/backend.rs b/compiler/rustc_codegen_ssa/src/traits/backend.rs
index 1991b55f191..0a02ca6b317 100644
--- a/compiler/rustc_codegen_ssa/src/traits/backend.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/backend.rs
@@ -142,15 +142,6 @@ fn target_machine_factory(
         target_features: &[String],
     ) -> TargetMachineFactoryFn<Self>;
 
-    fn spawn_thread<F, T>(_time_trace: bool, f: F) -> std::thread::JoinHandle<T>
-    where
-        F: FnOnce() -> T,
-        F: Send + 'static,
-        T: Send + 'static,
-    {
-        std::thread::spawn(f)
-    }
-
     fn spawn_named_thread<F, T>(
         _time_trace: bool,
         name: String,