avr.c (avr_option_override): Set flag_omit_frame_pointer to 0 if frame pointer…

avr.c (avr_option_override): Set flag_omit_frame_pointer to 0 if frame pointer is needed for unwinding.

	* config/avr/avr.c (avr_option_override): Set
	flag_omit_frame_pointer to 0 if frame pointer is needed for
	unwinding.

From-SVN: r179765

gcc/ChangeLog

+2011-10-10  Georg-Johann Lay  <avr@gjlay.de>
+
+	* config/avr/avr.c (avr_option_override): Set
+	flag_omit_frame_pointer to 0 if frame pointer is needed for
+	unwinding.
+
 2011-10-10  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR bootstrap/50665

gcc/config/avr/avr.c

@@ -351,6 +351,21 @@ avr_option_override (void)
 {
   flag_delete_null_pointer_checks = 0;
 
+  /* Unwind tables currently require a frame pointer for correctness,
+     see toplev.c:process_options().  */
+
+  if ((flag_unwind_tables
+       || flag_non_call_exceptions
+       || flag_asynchronous_unwind_tables)
+      && !ACCUMULATE_OUTGOING_ARGS)
+    {
+      flag_omit_frame_pointer = 0;
+    }
+  else
+    {
+      flag_omit_frame_pointer = (optimize >= 1);
+    }
+
   avr_current_device = &avr_mcu_types[avr_mcu_index];
   avr_current_arch = &avr_arch_types[avr_current_device->arch];
   avr_extra_arch_macro = avr_current_device->macro;