--- a/gcc/flags.h	Sun Aug 21 07:07:55 2011 +0900
+++ b/gcc/flags.h	Fri Oct 27 22:46:09 2017 +0900
@@ -1,7 +1,5 @@
 /* Compilation switch flag definitions for GCC.
-   Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
-   2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
-   Free Software Foundation, Inc.
+   Copyright (C) 1987-2017 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -22,10 +20,6 @@
 #ifndef GCC_FLAGS_H
 #define GCC_FLAGS_H
 
-#include "coretypes.h"
-#include "flag-types.h"
-#include "options.h"
-
 #if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) && !defined(IN_RTS)
 
 /* Names of debug_info_type, for error messages.  */
@@ -34,25 +28,10 @@
 extern void strip_off_ending (char *, int);
 extern int base_of_path (const char *path, const char **base_out);
 
-/* True if this is the LTO front end (lto1).  This is used to disable
-   gimple generation and lowering passes that are normally run on the
-   output of a front end.  These passes must be bypassed for lto since
-   they have already been done before the gimple was written.  */
-
-extern bool in_lto_p;
-
 /* Return true iff flags are set as if -ffast-math.  */
 extern bool fast_math_flags_set_p (const struct gcc_options *);
 extern bool fast_math_flags_struct_set_p (struct cl_optimization *);
 
-/* Used to set the level of -Wstrict-aliasing in OPTS, when no level
-   is specified.  The external way to set the default level is to use
-   -Wstrict-aliasing=level.
-   ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
-   and 0 otherwise.  After calling this function, wstrict_aliasing will be
-   set to the default value of -Wstrict_aliasing=level.  */
-
-extern void set_Wstrict_aliasing (struct gcc_options *opts, int onoff);
 
 /* Now the symbols that are set with `-f' switches.  */
 
@@ -60,13 +39,6 @@
 
 extern bool final_insns_dump_p;
 
-/* Nonzero means make permerror produce warnings instead of errors.  */
-
-extern int flag_permissive;
-
-/* Generate code for GNU or NeXT Objective-C runtime environment.  */
-
-extern int flag_next_runtime;
 
 /* Other basic status info about current function.  */
 
@@ -112,39 +84,12 @@
 #define flag_excess_precision \
   (this_target_flag_state->x_flag_excess_precision)
 
-/* Nonzero if we dump in VCG format, not plain text.  */
-extern int dump_for_graph;
-
 /* Returns TRUE if generated code should match ABI version N or
    greater is in use.  */
 
 #define abi_version_at_least(N) \
   (flag_abi_version == 0 || flag_abi_version >= (N))
 
-/* True if overflow wraps around for the given integral type.  That
-   is, TYPE_MAX + 1 == TYPE_MIN.  */
-#define TYPE_OVERFLOW_WRAPS(TYPE) \
-  (TYPE_UNSIGNED (TYPE) || flag_wrapv)
-
-/* True if overflow is undefined for the given integral type.  We may
-   optimize on the assumption that values in the type never overflow.
-
-   IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
-   must issue a warning based on warn_strict_overflow.  In some cases
-   it will be appropriate to issue the warning immediately, and in
-   other cases it will be appropriate to simply set a flag and let the
-   caller decide whether a warning is appropriate or not.  */
-#define TYPE_OVERFLOW_UNDEFINED(TYPE) \
-  (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
-
-/* True if overflow for the given integral type should issue a
-   trap.  */
-#define TYPE_OVERFLOW_TRAPS(TYPE) \
-  (!TYPE_UNSIGNED (TYPE) && flag_trapv)
-
-/* True if pointer types have undefined overflow.  */
-#define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
-
 /* Whether to emit an overflow warning whose code is C.  */
 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))