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-rw-r--r--clang/lib/Tooling/JSONCompilationDatabase.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Tooling/JSONCompilationDatabase.cpp b/clang/lib/Tooling/JSONCompilationDatabase.cpp
index 158b9a5..cc5bd4a 100644
--- a/clang/lib/Tooling/JSONCompilationDatabase.cpp
+++ b/clang/lib/Tooling/JSONCompilationDatabase.cpp
@@ -34,6 +34,7 @@
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <memory>
+#include <optional>
#include <string>
#include <system_error>
#include <tuple>