--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/mips/driver-native.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,81 @@
+/* Subroutines for the gcc driver.
+   Copyright (C) 2008 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"
+
+/* This will be called by the spec parser in gcc.c when it sees
+   a %:local_cpu_detect(args) construct.  Currently it will be called
+   with either "arch" or "tune" as argument depending on if -march=native
+   or -mtune=native is to be substituted.
+
+   It returns a string containing new command line parameters to be
+   put at the place of the above two options, depending on what CPU
+   this is executed.  E.g. "-march=loongson2f" on a Loongson 2F for
+   -march=native.  If the routine can't detect a known processor,
+   the -march or -mtune option is discarded.
+
+   ARGC and ARGV are set depending on the actual arguments given
+   in the spec.  */
+const char *
+host_detect_local_cpu (int argc, const char **argv)
+{
+  const char *cpu = NULL;
+  char buf[128];
+  FILE *f;
+  bool arch;
+
+  if (argc < 1)
+    return NULL;
+
+  arch = strcmp (argv[0], "arch") == 0;
+  if (!arch && strcmp (argv[0], "tune"))
+    return NULL;
+
+  f = fopen ("/proc/cpuinfo", "r");
+  if (f == NULL)
+    return NULL;
+
+  while (fgets (buf, sizeof (buf), f) != NULL)
+    if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)
+      {
+	if (strstr (buf, "Godson2 V0.2") != NULL
+	    || strstr (buf, "Loongson-2 V0.2") != NULL)
+	  cpu = "loongson2e";
+	else if (strstr (buf, "Godson2 V0.3") != NULL
+		 || strstr (buf, "Loongson-2 V0.3") != NULL)
+	  cpu = "loongson2f";
+	else if (strstr (buf, "SiByte SB1") != NULL)
+	  cpu = "sb1";
+	else if (strstr (buf, "R5000") != NULL)
+	  cpu = "r5000";
+	else if (strstr (buf, "Octeon") != NULL)
+	  cpu = "octeon";
+	break;
+      }
+
+  fclose (f);
+
+  if (cpu == NULL)
+    return NULL;
+
+  return concat ("-m", argv[0], "=", cpu, NULL);
+}