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

[Richard Smith via cfe-commits]

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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