[patch] Lazily provide a __float128 type in -std=gnu++11 mode

[Eli Friedman]

On Thu, Jun 20, 2013 at 1:45 PM, Nico Weber <thakis at chromium.org> wrote:

> Hi,
>
> the attached patch lazily inserts a __float128 type the first time one is
> looked up. This is needed to compile libstdc++4.7+ headers in -std=gnu++11
> mode. This fixes PR13530, see that bug for more information.
>
> Ok?
>

Is there any particular reason you're checking for GNUMode?

"variable has incomplete type '__float128'" is a terrible error message if
someone actually tries to use __float128 with clang.  Can we do better?

-Eli
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