--- a/gcc/opts-global.c	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/opts-global.c	Thu Oct 25 07:37:49 2018 +0900
@@ -1,6 +1,6 @@
 /* Command line option handling.  Code involving global state that
    should not be shared with the driver.
-   Copyright (C) 2002-2017 Free Software Foundation, Inc.
+   Copyright (C) 2002-2018 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -38,6 +38,7 @@
 #include "stringpool.h"
 #include "attribs.h"
 #include "asan.h"
+#include "file-prefix-map.h" /* add_*_prefix_map()  */
 
 typedef const char *const_char_p; /* For DEF_VEC_P.  */
 
@@ -365,6 +366,10 @@
 	  add_debug_prefix_map (opt->arg);
 	  break;
 
+	case OPT_ffile_prefix_map_:
+	  add_file_prefix_map (opt->arg);
+	  break;
+
 	case OPT_fdump_:
 	  if (!g->get_dumps ()->dump_switch_p (opt->arg))
 	    error ("unrecognized command line option %<-fdump-%s%>", opt->arg);