Enable std::underlying_type for gcc >= 4.7

[Albert J. Wong (王重傑)]

another ping. :)

Please let me know if there's some other way I should be requesting a
review...

Thanks,
Albert


On Mon, Jun 16, 2014 at 1:08 PM, Albert J. Wong (王重傑) <ajwong at chromium.org>
wrote:

> gentle ping!
>
>
> On Thu, Jun 12, 2014 at 1:50 PM, Albert J. Wong (王重傑) <ajwong at chromium.org
> > wrote:
>
>> Hi Marshall,
>>
>> gcc 4.7 added enough frontend support to implement most (not all) of
>> type_traits. Here's a patch that enables std::underlying_type.
>>
>> FYI, this is a first in a series of ~3 that will allow most libc++ tests
>> for type_traits and atomics to pass on gcc >= 4.7.  Will send those out as
>> I manage to get them fully cleaned up.
>>
>> Thanks,
>> Albert
>>
>
>
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