[libcxx] Reinstate <string.h> and fix overload sets to be const-correct wherever possible

[Eric Fiselier via cfe-commits]

The direction and change LGTM. Feel free to commit once the change has some
tests.

On Fri, Jan 8, 2016 at 5:45 PM, Duncan P. N. Exon Smith <
dexonsmith at apple.com> wrote:

> No one is waiting for me on this, are they?  FWIW, this seems like
> a good solution to me.  I'll see what I can do internally (I filed
> a radar), but other platforms will likely need this anyway.
>
> > On 2016-Jan-08, at 16:06, Richard Smith <richard at metafoo.co.uk> wrote:
> >
> > Ping, is this OK to commit?
> >
> > On Thu, Dec 10, 2015 at 3:32 PM, Richard Smith <richard at metafoo.co.uk>
> wrote:
> > On Thu, Dec 10, 2015 at 11:45 AM, Marshall Clow <mclow.lists at gmail.com>
> wrote:
> > On Tue, Dec 8, 2015 at 3:52 PM, Richard Smith <richard at metafoo.co.uk>
> wrote:
> > Ping.
> >
> > Sorry about that.
> > Completely missed this in my email flood.
> >
> > This approach looks ok to me, but I wonder if it would be better to get
> Apple to fix their iOS C library instead.
> >
> > Well, it's not broken in the sense that it does what the C standard
> library is supposed to do. But it's not providing the "C pieces" of a C++
> standard library. I don't know what its design goal is here, but with this
> patch we don't need to care.
> >
> > Duncan offered to file a bug on this, but I don't know if that's
> happened.
> >
> > Are there other broken C libraries that we are concerned with?
> >
> > Probably :) I don't know the complete set of C standard library
> implementations that people use with libc++, but I'd be surprised if Darwin
> were the only case we need to fix.
> >
>
>
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