static char *mybasename (const char *);
static int strhash (const char *);
static void usage (FILE *, int);
-static void display (const char *, va_list);
-static void inform (const char *, ...);
-static void warn (const char *, ...);
+static void display (const char *, va_list) ATTRIBUTE_PRINTF(1,0);
+static void inform (const char *, ...) ATTRIBUTE_PRINTF_1;
+static void warn (const char *, ...) ATTRIBUTE_PRINTF_1;
static char *look_for_prog (const char *, const char *, int);
static char *deduce_name (const char *);
static void delete_temp_files (void);