5.15 OpenMP

GNU Fortran attempts to be OpenMP Application Program Interface v2.5 compatible when invoked with the -fopenmp option. GNU Fortran then generates parallelized code according to the OpenMP directives used in the source. The OpenMP Fortran runtime library routines are provided both in a form of a Fortran 90 module named omp_lib and in a form of a Fortran include file named omp_lib.h.

For details refer to the actual OpenMP Application Program Interface v2.5 specification.