Lahey/GNU Fortran

-[n]quad

Quadruple Precision

Compile only. Default: -nquad

GFortran option: -fdefault-double-8, -fdefault-real-8

Specify -quad to extend all double-precision REAL and double-precision COMPLEX variables, arrays, constants, and functions to 128 bit REAL and COMPLEX respectively. Specifying -quad forces -dbl, so using -quad causes the precision of all REAL variables to be doubled.

If you use -quad, all source files (including modules) in a program should be compiled with -quad. Specifying -quad will usually result in significantly slower executables.