https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95640
--- Comment #1 from Bill Long <longb at cray dot com> ---
The main problem here is that selected_real_kind and ieee_selected_real_kind
have different specifications. The ieee_selected_real_kind requires a KIND
value corresponding to an IEEE floating format, whereas selected_real_kind is
only limited to formats supported by the processor, including non-ieee formats,
like the x87 80-bit format. (Which, apparently, even the Intel compiler no
longer supports.)
The expected output from gfortran would be
> gfortran test.f90
> ./a.out
selected_real_kind(16) = 10
ieee_selected_real_kind(16) = 16
