Bug#678033: clang++ --std=gnu++11 fails to compile <iostream>

[Sami Liedes]

On Mon, Jun 18, 2012 at 09:45:14PM +0300, Sami Liedes wrote:
> $ clang++ test.cpp -o test -std=gnu++11
[...]
> /usr/bin/../lib/gcc/x86_64-linux-gnu/4.7/../../../../include/c++/4.7/type_traits:256:39: error: use of undeclared identifier '__float128'
>     struct __is_floating_point_helper<__float128>
>                                       ^
> 1 error generated.

There's a fix around the interwebs that fixes this issue by patching
the libstdc++ headers to #undef _GLIBCXX_USE_FLOAT128 if __clang__ is
defined:

   http://old.nabble.com/-google--Hide-all-uses-of-__float128-from-Clang-(issue6195066)-td33821546.html

	Sami
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