--- /dev/null
+//===-- include/flang/Runtime/extensions.h ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// These C-coded entry points with Fortran-mangled names implement legacy
+// extensions that will eventually be implemented in Fortran.
+
+#ifndef FORTRAN_RUNTIME_EXTENSIONS_H_
+#define FORTRAN_RUNTIME_EXTENSIONS_H_
+
+#define FORTRAN_SUBROUTINE_NAME(name) name##_
+
+extern "C" {
+
+// CALL FLUSH(n) antedates the Fortran 2003 FLUSH statement.
+void FORTRAN_SUBROUTINE_NAME(flush)(const int &unit);
+
+} // extern "C"
+#endif // FORTRAN_RUNTIME_EXTENSIONS_H_
--- /dev/null
+//===-- runtime/extensions.cpp --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// These C-coded entry points with Fortran-mangled names implement legacy
+// extensions that will eventually be implemented in Fortran.
+
+#include "flang/Runtime/extensions.h"
+#include "flang/Runtime/io-api.h"
+
+extern "C" {
+
+// SUBROUTINE FLUSH(N)
+// FLUSH N
+// END
+namespace Fortran::runtime::io {
+void FORTRAN_SUBROUTINE_NAME(flush)(const int &unit) {
+ Cookie cookie{IONAME(BeginFlush)(unit, __FILE__, __LINE__)};
+ IONAME(EndIoStatement)(cookie);
+}
+} // namespace Fortran::runtime::io
+} // extern "C"