(Solaris) Enable interval arithmetic extensions and set a suitable floating-point environment.
The default if not specified is -xia=widestneed.
Fortran extensions for interval arithmetic calculations are detailed in the Interval Arithmetic Programming Reference. See also 3.4.130 –xinterval[={widestneed|strict|no}].
The -xia flag is a macro that expands as follows:
-xia or-xia=widestneed |
-xinterval=widestneed -ftrap=%none -fns=no -fsimple=0 |
-xia=strict |
-xinterval=strict -ftrap=%none -fns=no -fsimple=0 |