/* pr 13536 */
-static void param_reg (register char pr_char,
+static void param_reg (register signed char pr_char,
register unsigned char pr_uchar,
register short pr_short,
register unsigned short pr_ushort);
static void dummy () {}
static void
-param_reg(register char pr_char,
+param_reg(register signed char pr_char,
register unsigned char pr_uchar,
register short pr_short,
register unsigned short pr_ushort)