Fix build for targets not defining EXTRA_SPECS.

	* gcc.c (driver::finalize): Only assign to extra_specs if
	[EXTRA_SPECS].

From-SVN: r227194

gcc/ChangeLog

+2015-08-25  Joseph Myers  <joseph@codesourcery.com>
+
+	* gcc.c (driver::finalize): Only assign to extra_specs if
+	[EXTRA_SPECS].
+
 2015-08-25  Marek Polacek  <polacek@redhat.com>
 
 	PR middle-end/67330

gcc/gcc.c

@@ -9813,7 +9813,9 @@ driver::finalize ()
 	}
       *(sl->ptr_spec) = sl->default_ptr;
     }
+#ifdef EXTRA_SPECS
   extra_specs = NULL;
+#endif
 
   processing_spec_function = 0;