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diff --git a/gcc/params.c b/gcc/params.c
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+/* params.c - Run-time parameters.
+   Copyright (C) 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Written by Mark Mitchell <mark@codesourcery.com>.
+
+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 2, 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 COPYING.  If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.
+
+*/
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "params.h"
+#include "toplev.h"
+
+/* An array containing the compiler parameters and their current
+   values.  */
+
+param_info *compiler_params;
+
+/* The number of entries in the table.  */
+
+static size_t num_compiler_params;
+
+/* Add the N PARAMS to the current list of compiler parameters.  */
+
+void
+add_params (const param_info params[], size_t n)
+{
+  /* Allocate enough space for the new parameters.  */
+  compiler_params = xrealloc (compiler_params,
+			      (num_compiler_params + n) * sizeof (param_info));
+  /* Copy them into the table.  */
+  memcpy (compiler_params + num_compiler_params,
+	  params,
+	  n * sizeof (param_info));
+  /* Keep track of how many parameters we have.  */
+  num_compiler_params += n;
+}
+
+/* Set the VALUE associated with the parameter given by NAME.  */
+
+void
+set_param_value (const char *name, int value)
+{
+  size_t i;
+
+  /* Make sure nobody tries to set a parameter to an invalid value.  */
+  gcc_assert (value != INVALID_PARAM_VAL);
+
+  /* Scan the parameter table to find a matching entry.  */
+  for (i = 0; i < num_compiler_params; ++i)
+    if (strcmp (compiler_params[i].option, name) == 0)
+      {
+	if (value < compiler_params[i].min_value)
+	  error ("minimum value of parameter %qs is %u",
+		 compiler_params[i].option,
+		 compiler_params[i].min_value);
+	else if (compiler_params[i].max_value > compiler_params[i].min_value
+		 && value > compiler_params[i].max_value)
+	  error ("maximum value of parameter %qs is %u",
+		 compiler_params[i].option,
+		 compiler_params[i].max_value);
+	else
+	  compiler_params[i].value = value;
+	return;
+      }
+
+  /* If we didn't find this parameter, issue an error message.  */
+  error ("invalid parameter %qs", name);
+}