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

[Richard Smith via cfe-commits]

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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