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-rw-r--r--clang/tools/driver/cc1as_main.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/tools/driver/cc1as_main.cpp b/clang/tools/driver/cc1as_main.cpp
index b0fca509b0c6..2a87266cf92d 100644
--- a/clang/tools/driver/cc1as_main.cpp
+++ b/clang/tools/driver/cc1as_main.cpp
@@ -54,6 +54,7 @@
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
+#include <optional>
#include <system_error>
using namespace clang;
using namespace clang::driver;