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

[Denis Chertykov]

2011/10/10 Georg-Johann Lay <avr@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.