[Bug fortran/95640] gfortran ieee_selected_real_kind returns 10

[sgk at troutmask dot apl.washington.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95640

--- Comment #16 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Thu, Jun 11, 2020 at 10:40:29PM -0700, Steve Kargl wrote:
> On Fri, Jun 12, 2020 at 04:16:53AM +0000, kargl at gcc dot gnu.org wrote:
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95640
> > 
> > --- Comment #12 from kargl at gcc dot gnu.org ---
> > (In reply to Bill Long from comment #11)
> > > I checked with the Intel docs and the ia64 version of the compiler (what HPC
> > > users use) does not support x87. 
> > > 
> > > Is there a gfortran compiler option to disable x87 use (i.e. REAL(10) is an
> > > error), to match the other compilers?
> > 
> > The types are set up in trans-type.c(gfc_init_kinds).  I
> > do not see an option that would disable querying for 
> > long_double_type_node.  In principle, one might be able
> > to define an option that prevents gfortran from see a
> > long_double_type_node. This should then disable REAL(10).
> 
> I have confirmed that having an -fdisable-real10 option
> could disable REAL(10) by commenting out the enumeration
> of long_double_type_node, i.e.,
> 

Hmmm.  Well, my attempt to add an option failed.  I leave
this here in case someone else wants to unfix gfortran.