--- a/gcc/fortran/lang.opt	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/fortran/lang.opt	Thu Oct 25 07:37:49 2018 +0900
@@ -1,5 +1,5 @@
-; Options for the Fortran 95 front end.
-; Copyright (C) 2003-2017 Free Software Foundation, Inc.
+; Options for the Fortran front end.
+; Copyright (C) 2003-2018 Free Software Foundation, Inc.
 ;
 ; This file is part of GCC.
 ;
@@ -245,8 +245,12 @@
 Fortran Warning
 ; Documented in common
 
+Wfrontend-loop-interchange
+Fortran Var(flag_warn_frontend_loop_interchange)
+Warn if loops have been interchanged.
+
 Wfunction-elimination
-Fortran Warning Var(warn_function_elimination)
+Fortran Warning Var(warn_function_elimination) LangEnabledBy(Fortran,Wextra)
 Warn about function call elimination.
 
 Wimplicit-interface
@@ -548,6 +552,10 @@
 Fortran RejectNegative Joined UInteger Var(flag_free_line_length) Init(132)
 -ffree-line-length-<n>	Use n as character line width in free mode.
 
+ffrontend-loop-interchange
+Fortran Var(flag_frontend_loop_interchange) Init(-1)
+Try to interchange loops if profitable.
+
 ffrontend-optimize
 Fortran Var(flag_frontend_optimize) Init(-1)
 Enable front end optimization.
@@ -794,6 +802,10 @@
 Fortran
 Conform to the ISO Fortran 2008 standard including TS 29113.
 
+std=f2018
+Fortran
+Conform to the ISO Fortran 2018 standard.
+
 std=f95
 Fortran
 Conform to the ISO Fortran 95 standard.