Enable std::underlying_type for gcc >= 4.7

[Albert J. Wong (王重傑)]

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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