From 9f796159f28775b3f93d77e173c1fd3413c2e60e Mon Sep 17 00:00:00 2001
From: Haojian Wu <hokein.wu@gmail.com>
Date: Thu, 7 Nov 2024 08:24:54 +0100
Subject: [PATCH] Add clang::lifetimebound annotation to llvm::function_ref
 (#115019)

This helps catch dangling llvm::function_ref references, see #114950,
#114949, #114808, #114789
---
 llvm/include/llvm/ADT/STLFunctionalExtras.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/llvm/include/llvm/ADT/STLFunctionalExtras.h b/llvm/include/llvm/ADT/STLFunctionalExtras.h
index 6f172504b3c167..3b9d40959d7142 100644
--- a/llvm/include/llvm/ADT/STLFunctionalExtras.h
+++ b/llvm/include/llvm/ADT/STLFunctionalExtras.h
@@ -16,6 +16,7 @@
 #define LLVM_ADT_STLFUNCTIONALEXTRAS_H
 
 #include "llvm/ADT/STLForwardCompat.h"
+#include "llvm/Support/Compiler.h"
 
 #include <cstdint>
 #include <type_traits>
@@ -52,7 +53,7 @@ class function_ref<Ret(Params...)> {
 
   template <typename Callable>
   function_ref(
-      Callable &&callable,
+      Callable &&callable LLVM_LIFETIME_BOUND,
       // This is not the copy-constructor.
       std::enable_if_t<!std::is_same<remove_cvref_t<Callable>,
                                      function_ref>::value> * = nullptr,