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-rw-r--r--clang/lib/CodeGen/CGHLSLRuntime.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CGHLSLRuntime.h b/clang/lib/CodeGen/CGHLSLRuntime.h
index 5cc2c89da0f8..29a849c18a2b 100644
--- a/clang/lib/CodeGen/CGHLSLRuntime.h
+++ b/clang/lib/CodeGen/CGHLSLRuntime.h
@@ -24,6 +24,7 @@
#include "llvm/ADT/StringRef.h"
#include "llvm/Frontend/HLSL/HLSLResource.h"
+#include <optional>
#include <vector>
namespace llvm {