Comment 13 for bug 2052929

Note also that in glibc, _Float128 support in printf code can only be used in limited circumstances: either on powerpc64le, as one of the multiple supported long double formats there, or through the sharing of the printf code with the implementation of strfromf128.

In particular, there are no glibc printf formats corresponding directly to _FloatN / _FloatNx types. There was support in principle at the WG14 meeting in Strasbourg in January for having some form of printf/scanf support for such types in C2y, but major work is still needed on the wording that was proposed in N3184.