5.3.1 Fortran 95 Intrinsics

The Fortran 95 standard supports intrinsic functions that FORTRAN 77 did not have. The full set of Fortran 95 intrinsics, including non-standard intrinsics, appears in the Fortran Library Reference manual.

If you use any of the intrinsic names listed in the Fortran Library Reference as a function name in your program, you must add an EXTERNAL statement for f95 to use your routine rather than the intrinsic one.

The Fortran Library Reference also lists all the intrinsics recognized by earlier releases of the f77 compiler. The f95 compiler recognizes these names as intrinsics as well.

Compiling with -f77=intrinsics limits the compiler’s recognition of intrinsic functions to just those that were known to the f77 compiler, ignoring the Fortran 95 intrinsics.