re PR target/65296 ([avr] fix various issues with specs file generation)

	PR target/65296
	* config/avr/driver-avr.c (avr_devicespecs_file): Allow to specify
	the same -mmcu=MCU more than once.

From-SVN: r221602

gcc/ChangeLog

+2015-03-23  Georg-Johann Lay  <avr@gjlay.de>
+
+	PR target/65296
+	* config/avr/driver-avr.c (avr_devicespecs_file): Allow to specify
+	the same -mmcu=MCU more than once.
+
 2015-03-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/65522

gcc/config/avr/driver-avr.c

@@ -55,9 +55,10 @@ avr_diagnose_devicespecs_error (const char *mcu, const char *filename)
 
 /* Implement spec function `device-specs-file´.
 
-   Compose -specs=<specs-file-name>.  If everything went well then argv[0]
-   is the inflated specs directory and argv[1] is a device or core name as
-   supplied to -mmcu=*.  */
+   Compose -specs=<specs-file-name>%s.  If everything went well then argv[0]
+   is the inflated (absolute) specs directory and argv[1] is a device or
+   core name as supplied by -mmcu=*.  When building GCC the path might
+   be relative.  */
 
 const char*
 avr_devicespecs_file (int argc, const char **argv)
@@ -82,15 +83,21 @@ avr_devicespecs_file (int argc, const char **argv)
       mmcu = AVR_MMCU_DEFAULT;
       break;
 
-    case 2:
+    default:
       mmcu = argv[1];
-      break;
 
-    default:
-      error ("specified option %qs more than once", "-mmcu=");
+      // Allow specifying the same MCU more than once.
+
+      for (int i = 2; i < argc; i++)
+        if (0 != strcmp (mmcu, argv[i]))
+          {
+            error ("specified option %qs more than once", "-mmcu");
             return X_NODEVLIB;
           }
 
+      break;
+    }
+
   specfile_name = concat (argv[0], dir_separator_str, "specs-", mmcu, NULL);
 
 #ifdef DEBUG_SPECS