--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/d/dmd/root/checkedint.h	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,30 @@
+
+/* Compiler implementation of the D programming language
+ * Copyright (C) 2003-2019 by The D Language Foundation, All Rights Reserved
+ * written by Walter Bright
+ * http://www.digitalmars.com
+ * Distributed under the Boost Software License, Version 1.0.
+ * http://www.boost.org/LICENSE_1_0.txt
+ * https://github.com/D-Programming-Language/dmd/blob/master/src/root/checkedint.h
+ */
+
+#include "dsystem.h"
+
+
+int adds(int x, int y, bool& overflow);
+int64_t adds(int64_t x, int64_t y, bool& overflow);
+unsigned addu(unsigned x, unsigned y, bool& overflow);
+uint64_t addu(uint64_t x, uint64_t y, bool& overflow);
+
+int subs(int x, int y, bool& overflow);
+int64_t subs(int64_t x, int64_t y, bool& overflow);
+unsigned subu(unsigned x, unsigned y, bool& overflow);
+uint64_t subu(uint64_t x, uint64_t y, bool& overflow);
+
+int negs(int x, bool& overflow);
+int64_t negs(int64_t x, bool& overflow);
+
+int muls(int x, int y, bool& overflow);
+int64_t muls(int64_t x, int64_t y, bool& overflow);
+unsigned mulu(unsigned x, unsigned y, bool& overflow);
+uint64_t mulu(uint64_t x, uint64_t y, bool& overflow);