--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/file-prefix-map.h	Thu Oct 25 10:21:07 2018 +0900
@@ -0,0 +1,28 @@
+/* Declarations for file prefix remapping support (-f*-prefix-map options).
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 3, or (at your option) any
+   later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_FILE_PREFIX_MAP_H
+#define GCC_FILE_PREFIX_MAP_H
+
+void add_macro_prefix_map (const char *);
+void add_debug_prefix_map (const char *);
+void add_file_prefix_map (const char *);
+
+const char *remap_macro_filename (const char *);
+const char *remap_debug_filename (const char *);
+
+#endif /* !GCC_FILE_PREFIX_MAP_H  */