[Bug libstdc++/43622] no C++ typeinfo for __float128 and __int128

["pbristow at hetp dot u-net.com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43622

Paul A. Bristow <pbristow at hetp dot u-net.com> changed:

           What    |Removed                     |Added
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                 CC|                            |pbristow at hetp dot u-net.com

--- Comment #12 from Paul A. Bristow <pbristow at hetp dot u-net.com> ---
This still exists at 4.8.2 and is a *showstopper* for running the Boost.Math
library at all the available precisions, up to 128-bit precision where
available.

typeid(type).name() fails with:

undefined reference to `typeinfo for __float128'

We can check that the library seems to work OK by ugly hacking of error
handling and a few examples of test code (out of the hundreds of tests), but we
absolutely need this before it can be fully tested at 128-bit precision and
released.

Getting this library to pass is part of a demonstration of the proposed C++ and
C library additions by Christopher Kormanyos and John Maddock

Floating-Point Typedefs Having Specified Widths - N3626

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3626.pdf

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1703.pdf

Everything is working to provide full C++ 128-bit floating-point - apart from
this :-( 

So we are very keen to have a fix.