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-rw-r--r--clang/lib/Basic/Targets/X86.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
index a6eea30311d3..affe20325bed 100644
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -18,6 +18,7 @@
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/X86TargetParser.h"
+#include <optional>
namespace clang {
namespace targets {