[Bug libfortran/104233] [12 regression] ieee/issignaling_fallback.h broke Solaris/SPARC bootstrap

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104233

--- Comment #1 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
If __FLT128_IS_IEC_60559__ is defined, does it mean that the associated type is
accessible as _Float128?