Index: c-decl.c
===================================================================
RCS file: /home/ncvs/src/contrib/gcc/c-decl.c,v
retrieving revision 1.6
diff -u -r1.6 c-decl.c
--- c-decl.c	4 Dec 2002 15:48:26 -0000	1.6
+++ c-decl.c	8 Dec 2002 03:53:16 -0000
@@ -349,6 +349,11 @@
 
 int mesg_implicit_function_declaration = -1;
 
+/* Nonzero means message about casts with integer/pointer size mismatches;
+ 1 means warning; 2 means error.  */
+
+int mesg_bad_pointer_cast = 1;
+
 /* Nonzero means give string constants the type `const char *'
    to get extra warnings from them.  These warnings will be too numerous
    to be useful, except in thoroughly ANSIfied programs.  */
@@ -658,6 +663,12 @@
     mesg_implicit_function_declaration = 1;
   else if (!strcmp (p, "-Wno-implicit-function-declaration"))
     mesg_implicit_function_declaration = 0;
+  else if (!strcmp (p, "-Werror-bad-pointer-cast"))
+    mesg_bad_pointer_cast = 2;
+  else if (!strcmp (p, "-Wbad-pointer-cast"))
+    mesg_bad_pointer_cast = 1;
+  else if (!strcmp (p, "-Wno-bad-pointer-cast"))
+    mesg_bad_pointer_cast = 0;
   else if (!strcmp (p, "-Wimplicit-int"))
     warn_implicit_int = 1;
   else if (!strcmp (p, "-Wno-implicit-int"))
Index: c-tree.h
===================================================================
RCS file: /home/ncvs/src/contrib/gcc/c-tree.h,v
retrieving revision 1.8
diff -u -r1.8 c-tree.h
--- c-tree.h	4 Dec 2002 16:31:45 -0000	1.8
+++ c-tree.h	8 Dec 2002 03:51:29 -0000
@@ -371,6 +371,9 @@
 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 extern int mesg_implicit_function_declaration;
 
+/* Warn about bad pointer casts.  1 = warning, 2 = error.  */
+extern int mesg_bad_pointer_cast;
+
 /* In c-decl.c */
 extern void finish_incomplete_decl PARAMS ((tree));
 
Index: c-typeck.c
===================================================================
RCS file: /home/ncvs/src/contrib/gcc/c-typeck.c,v
retrieving revision 1.1.1.11
diff -u -r1.1.1.11 c-typeck.c
--- c-typeck.c	17 Sep 2002 04:02:10 -0000	1.1.1.11
+++ c-typeck.c	8 Dec 2002 04:02:18 -0000
@@ -3767,7 +3767,13 @@
 	  && TREE_CODE (otype) == POINTER_TYPE
 	  && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
 	  && !TREE_CONSTANT (value))
-	warning ("cast from pointer to integer of different size");
+	{
+	  if (mesg_bad_pointer_cast == 2)
+	    error ("cast from pointer to integer of different size");
+	  else if (mesg_bad_pointer_cast == 1)
+	    warning ("cast from pointer to integer of different size");
+	}
+
 
       if (warn_bad_function_cast
 	  && TREE_CODE (value) == CALL_EXPR
@@ -3779,7 +3785,12 @@
 	  && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
 	  /* Don't warn about converting any constant.  */
 	  && !TREE_CONSTANT (value))
-	warning ("cast to pointer from integer of different size");
+	{
+	  if (mesg_bad_pointer_cast == 2)
+	    error ("cast to pointer from integer of different size");
+	  else if (mesg_bad_pointer_cast == 1)
+	    warning ("cast to pointer from integer of different size");
+	}
 
       ovalue = value;
       value = convert (type, value);