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-rw-r--r--flang/lib/Frontend/CompilerInvocation.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index 33ec6af..b17d197 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -36,6 +36,7 @@
#include "llvm/Support/Process.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
+#include <optional>
using namespace Fortran::frontend;