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### Exponential function

There was a bug when using any quadmath `expq` function on GCC : GCC bug #60349 caused by mingw-64 bug #368.

To work round this defect, an alternative implementation of 128-bit exp was temporarily provided by `boost/cstdfloat.hpp`.

The mingw bug was fixed at 2014-03-12 and GCC 6.1.1 now works as expected.

| Tip
It is essential to link to the quadmath library, for example, in a b2/bjam file: `<linkflags>-lquadmath`

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