exception handling poll

[Joe Buck]

> A little poll for those that have been complaining about 
> exception handling frame unwind info being included for C:
> 
>   Assuming the .eh_frame section is completely read-only, at what
>   eh/text ratio would you find it acceptible that that information
>   is always there?
> 
> Can you live with 10%?  8?  5?  3?

If the .eh_frame section does not get paged into memory, then I think 10% is
acceptable (remember that the in-memory penalty is essentially zero).  For
kernels or embedded code where there is no paging, the acceptable figure
is smaller, and I suspect that folks would use -fno-exceptions no matter
how small the penalty is (unless it is 2% or less).