support of 128 bit long real on linux for ia32

[Stephen L Moshier]

> Do plan to enhance your compiler in order to get
> "long double" in C compatible with real(16) in fortran ?

It was a straightforward job to implement the "long double"
type in i386 gcc as 128-bit soft-float TFmode with 113-bit precision.
I might still have the patches for that (though they would be about
eight years old now).

You cannot easily have both 80-bit and 128-bit support in gcc at the
same time, however.  I think you might have to implement
a "long long double" which probably no one has done yet.