[Bug fortran/82143] add a -fdefault-real-16 flag

[sgk at troutmask dot apl.washington.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82143

--- Comment #15 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Sat, Sep 16, 2017 at 02:33:02PM +0000, janus at gcc dot gnu.org wrote:
> 
> > I don't have access to ifort, so I have no idea what "-real-size 128"
> > does.  A google search does not find this.
>
> Maybe you should work on your web-search skills. Try this:

My googling skill are fine.  Perhaps, the OP should provide the 
description of ifort's option instead some vague reference. 
The top entry for googling "ifort -real_size 128" is 

https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/515632

Steve Lionel's response contains

  "128-bit reals, with extended precision and range, have been supported by
Intel
   Fortran since 2004, and DEC Fortran since 1980.  The preferable way to use
these
   is to declare variables as REAL(16) - use of flags to change default kinds
is
   not recommended."

I'm simply re-enforcing Steve Lionel's recommendation.  If gfortran does not
offer
the an option to change the default kind, it is fairly difficult to use it.

> 
> https://software.intel.com/en-us/node/691771
> 

This URL is not among the top 20 or so URLs returned by google.