--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/common/config/pdp11/pdp11-common.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,78 @@
+/* Common hooks for pdp11.
+   Copyright (C) 1994-2017 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "common/common-target.h"
+#include "common/common-target-def.h"
+#include "opts.h"
+#include "flags.h"
+
+/* Implement TARGET_OPTION_OPTIMIZATION_TABLE.  */
+
+static const struct default_options pdp11_option_optimization_table[] =
+  {
+    { OPT_LEVELS_3_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
+    { OPT_LEVELS_NONE, 0, NULL, 0 }
+  };
+
+/* Implement TARGET_HANDLE_OPTION.  */
+
+static bool
+pdp11_handle_option (struct gcc_options *opts,
+		     struct gcc_options *opts_set ATTRIBUTE_UNUSED,
+		     const struct cl_decoded_option *decoded,
+		     location_t loc ATTRIBUTE_UNUSED)
+{
+  size_t code = decoded->opt_index;
+
+  switch (code)
+    {
+    case OPT_m10:
+      opts->x_target_flags &= ~(MASK_40 | MASK_45);
+      return true;
+
+    default:
+      return true;
+    }
+}
+
+/* Implement TARGET_OPTION_INIT_STRUCT.  */
+
+static void
+pdp11_option_init_struct (struct gcc_options *opts)
+{
+  opts->x_flag_finite_math_only = 0;
+  opts->x_flag_trapping_math = 0;
+  opts->x_flag_signaling_nans = 0;
+}
+
+#undef TARGET_DEFAULT_TARGET_FLAGS
+#define TARGET_DEFAULT_TARGET_FLAGS \
+  (MASK_FPU | MASK_45 | TARGET_UNIX_ASM_DEFAULT)
+#undef TARGET_HANDLE_OPTION
+#define TARGET_HANDLE_OPTION pdp11_handle_option
+#undef TARGET_OPTION_OPTIMIZATION_TABLE
+#define TARGET_OPTION_OPTIMIZATION_TABLE pdp11_option_optimization_table
+#undef TARGET_OPTION_INIT_STRUCT
+#define TARGET_OPTION_INIT_STRUCT pdp11_option_init_struct
+
+struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;