throw(), pure and const flags on functions

[Paolo Carlini]

Hi Honza,
> For shared library we won't be able to derive this ourselves even with
> LTO since these are in fact part of ABI too.  So we IMO should decorate
> the functions implemented in libstdc++ library itself (not the headers).
>   
Let's make sure I understand your point. You are saying: for the
headers, there are hopes that the compiler can do a good work on its
own. On the other hand, for the library itself, the *.so in particular,
there are no hopes, even with LTO. Thus, I would say, adding a few
decorations in the *.cc files, in such cases when either performance or
code size is demonstrably improved, makes sense to me. Are there any
chances you can suggest something yourself with some numbers attached?

Thanks,
Paolo.