[Bug libstdc++/63345] Multiple undefined behaviors (static_cast<>) in libstdc++-v3/include/bits

[malcolm.parsons at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63345

--- Comment #11 from Malcolm Parsons <malcolm.parsons at gmail dot com> ---
(In reply to Jonathan Wakely from comment #10)
> > The attached patch fixes it for me.
> 
> That seems to be a backport of r223746 from trunk, right? I'll look into
> applying that to the gcc-5 branch.

It looks like it.  Thanks.