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diff --git a/gcc-4.9/gcc/common/common-target.h b/gcc-4.9/gcc/common/common-target.h
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index 000000000..a04e90f6c
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+++ b/gcc-4.9/gcc/common/common-target.h
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+/* Data structure definitions for common hooks.
+   Copyright (C) 2010-2014 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/>.
+
+   In other words, you are welcome to use, share and improve this program.
+   You are forbidden to forbid anyone else to use, share and improve
+   what you give them.   Help stamp out software-hoarding!  */
+
+#ifndef GCC_COMMON_TARGET_H
+#define GCC_COMMON_TARGET_H
+
+#include "input.h"
+
+/* Sets of optimization levels at which an option may be enabled by
+   default_options_optimization.  */
+enum opt_levels
+{
+  OPT_LEVELS_NONE, /* No levels (mark end of array).  */
+  OPT_LEVELS_ALL, /* All levels (used by targets to disable options
+		     enabled in target-independent code).  */
+  OPT_LEVELS_0_ONLY, /* -O0 only.  */
+  OPT_LEVELS_1_PLUS, /* -O1 and above, including -Os and -Og.  */
+  OPT_LEVELS_1_PLUS_SPEED_ONLY, /* -O1 and above, but not -Os or -Og.  */
+  OPT_LEVELS_1_PLUS_NOT_DEBUG, /* -O1 and above, but not -Og.  */
+  OPT_LEVELS_2_PLUS, /* -O2 and above, including -Os.  */
+  OPT_LEVELS_2_PLUS_SPEED_ONLY, /* -O2 and above, but not -Os or -Og.  */
+  OPT_LEVELS_3_PLUS, /* -O3 and above.  */
+  OPT_LEVELS_3_PLUS_AND_SIZE, /* -O3 and above and -Os.  */
+  OPT_LEVELS_SIZE, /* -Os only.  */
+  OPT_LEVELS_FAST /* -Ofast only.  */
+};
+
+/* Description of options to enable by default at given levels.  */
+struct default_options
+{
+  /* The levels at which to enable the option.  */
+  enum opt_levels levels;
+
+  /* The option index and argument or enabled/disabled sense of the
+     option, as passed to handle_generated_option.  If ARG is NULL and
+     the option allows a negative form, the option is considered to be
+     passed in negative form when the optimization level is not one of
+     those in LEVELS (in order to handle changes to the optimization
+     level with the "optimize" attribute).  */
+  size_t opt_index;
+  const char *arg;
+  int value;
+};
+
+#define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME;
+#define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS;
+#define DEFHOOK_UNDOC DEFHOOK
+#define HOOKSTRUCT(FRAGMENT) FRAGMENT
+
+#include "common-target.def"
+
+extern struct gcc_targetm_common targetm_common;
+
+#endif /* GCC_C_TARGET_H */