1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/MachineOperand.cpp b/llvm/lib/CodeGen/MachineOperand.cpp
index 797b3de..bc3a491 100644
--- a/llvm/lib/CodeGen/MachineOperand.cpp
+++ b/llvm/lib/CodeGen/MachineOperand.cpp
@@ -29,6 +29,7 @@
 #include "llvm/MC/MCDwarf.h"
 #include "llvm/Target/TargetIntrinsicInfo.h"
 #include "llvm/Target/TargetMachine.h"
+#include <optional>
 
 using namespace llvm;
 
@@ -470,7 +471,7 @@ static void printIRBlockReference(raw_ostream &OS, const BasicBlock &BB,
     printLLVMNameWithoutPrefix(OS, BB.getName());
     return;
   }
-  Optional<int> Slot;
+  std::optional<int> Slot;
   if (const Function *F = BB.getParent()) {
     if (F == MST.getCurrentFunction()) {
       Slot = MST.getLocalSlot(&BB);