builtins.c (expand_builtin_stpcpy): Copy `arglist' before modifying it.

	* builtins.c (expand_builtin_stpcpy): Copy `arglist' before
	modifying it.

From-SVN: r66409

gcc/ChangeLog

+2003-05-02  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* builtins.c (expand_builtin_stpcpy): Copy `arglist' before
+	modifying it.
+
 2003-05-03  Falk Hueffner <falk.hueffner@student.uni-tuebingen.de>
 	    Gerald Pfeifer  <pfeifer@dbai.tuwien.ac.at>
 

gcc/builtins.c

@@ -2491,13 +2491,15 @@ expand_builtin_stpcpy (arglist, target, mode)
     return 0;
   else
     {
+      tree newarglist;
       tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
       if (len == 0)
 	return 0;
 
       len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
-      chainon (arglist, build_tree_list (NULL_TREE, len));
-      return expand_builtin_memcpy (arglist, target, mode, /*endp=*/2);
+      newarglist = copy_list (arglist);
+      chainon (newarglist, build_tree_list (NULL_TREE, len));
+      return expand_builtin_memcpy (newarglist, target, mode, /*endp=*/2);
     }
 }