===================================================================
@@ -91,6 +91,7 @@ static bool avr_hard_regno_scratch_ok (u
static unsigned int avr_case_values_threshold (void);
static bool avr_frame_pointer_required_p (void);
static bool avr_can_eliminate (const int, const int);
+static void avr_help (void);
/* Allocate registers from r25 to r8 for parameters for function calls. */
#define FIRST_CUM_REG 26
@@ -192,6 +193,9 @@ static const struct attribute_spec avr_a
#undef TARGET_CAN_ELIMINATE
#define TARGET_CAN_ELIMINATE avr_can_eliminate
+#undef TARGET_HELP
+#define TARGET_HELP avr_help
+
struct gcc_target targetm = TARGET_INITIALIZER;
void
@@ -207,10 +211,8 @@ avr_override_options (void)
if (!t->name)
{
- fprintf (stderr, "unknown MCU '%s' specified\nKnown MCU names:\n",
- avr_mcu_name);
- for (t = avr_mcu_types; t->name; t++)
- fprintf (stderr," %s\n", t->name);
+ error ("unrecognized argument to -mmcu= option: %qs", avr_mcu_name);
+ inform (input_location, "See --target-help for supported MCUs");
}
avr_current_device = t;
@@ -223,6 +225,42 @@ avr_override_options (void)
init_machine_status = avr_init_machine_status;
}
+/* Implement TARGET_HELP */
+/* Report extra information for --target-help */
+
+static void
+avr_help (void)
+{
+ const struct mcu_type_s *t;
+ const char * const indent = " ";
+ int len;
+
+ /* Give a list of MCUs that are accepted by -mmcu=* .
+ Note that MCUs supported by the compiler might differ from
+ MCUs supported by binutils. */
+
+ len = strlen (indent);
+ printf ("Known MCU names:\n%s", indent);
+
+ /* Print a blank-separated list of all supported MCUs */
+
+ for (t = avr_mcu_types; t->name; t++)
+ {
+ printf ("%s ", t->name);
+ len += 1 + strlen (t->name);
+
+ /* Break long lines */
+
+ if (len > 66 && (t+1)->name)
+ {
+ printf ("\n%s", indent);
+ len = strlen (indent);
+ }
+ }
+
+ printf ("\n\n");
+}
+
/* return register class from register number. */
static const enum reg_class reg_class_tab[]={