[Bug libstdc++/78870] Support std::filesystem on Windows

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78870

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jan Niklas Hasse from comment #4)
> Do you mean the part about legal paperwork in
> https://gcc.gnu.org/contribute.html ?

Yes.

> And can I look at how boost::filesystem does this?

You can't copy any code, that would be a copyright violation. It's OK to see
which Windows API functions Boost uses for a particular filesystem operation,
but if you're not sure what is covered by copyright law then it's safer not to
use another project at all.

I was hoping that somebody who actually knows the Windows API would contribute
the code, so they already know what the appropriate functions are.