/* Indexed by mode class, gives the narrowest mode for each class. */
-enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS];
+extern enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS];
/* Commonly used modes. */
/* Mode whose width is BITS_PER_UNIT */
-enum machine_mode byte_mode;
+extern enum machine_mode byte_mode;
/* Mode whose width is BITS_PER_WORD */
-enum machine_mode word_mode;
+extern enum machine_mode word_mode;
/* Vector indexed by opcode giving info about the args for each opcode. */
static struct arityvec arityvec[] = {