--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flang/runtime/entry-names.h	Mon May 25 11:55:54 2020 +0900
@@ -0,0 +1,22 @@
+//===-- runtime/entry-names.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
+//
+//===----------------------------------------------------------------------===//
+
+// Defines the macro RTNAME(n) which decorates the external name of a runtime
+// library function or object with extra characters so that it
+// (a) is not in the user's name space,
+// (b) doesn't conflict with other libraries, and
+// (c) prevents incompatible versions of the runtime library from linking
+//
+// The value of REVISION should not be changed until/unless the API to the
+// runtime library must change in some way that breaks backward compatibility.
+
+#ifndef RTNAME
+#define NAME_WITH_PREFIX_AND_REVISION(prefix, revision, name) \
+  prefix##revision##name
+#define RTNAME(name) NAME_WITH_PREFIX_AND_REVISION(_Fortran, A, name)
+#endif