[Patch,AVR]: Avoid unwind warning from toplev.c

[Georg-Johann Lay]

toplev.c complains about unwind tables currently require a frame pointer for
correctness.

This patchlet supplies a fix to avoid build warnings/test fails in that it sets
flag_omit_frame_pointer to 0 if unwind needs FP.

toplev.c:process_options sets flag_unwind_tables depending on
flag_non_call_exceptions and flag_asynchronous_unwind_tables after calling
targetm.target_option.override() so that the test includes these flags, too.

Ok?

Johann

* config/avr/avr.c (avr_option_override): Set
flag_omit_frame_pointer to 0 if frame pointer is needed for
unwinding.
Index: config/avr/avr.c
===
--- config/avr/avr.c	(revision 179744)
+++ config/avr/avr.c	(working copy)
@@ -351,6 +351,20 @@ avr_option_override (void)
 {
   flag_delete_null_pointer_checks = 0;
 
+  /* Avoid warning from 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;

Re: [Patch,AVR]: Avoid unwind warning from toplev.c

[Denis Chertykov]

2011/10/10 Georg-Johann Lay a...@gjlay.de:
 toplev.c complains about unwind tables currently require a frame pointer for
 correctness.

 This patchlet supplies a fix to avoid build warnings/test fails in that it 
 sets
 flag_omit_frame_pointer to 0 if unwind needs FP.

 toplev.c:process_options sets flag_unwind_tables depending on
 flag_non_call_exceptions and flag_asynchronous_unwind_tables after calling
 targetm.target_option.override() so that the test includes these flags, too.

 Ok?

 Johann

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


Approved.

Denis.