libgomp/doc/enabling-openmp.rst

   1 ..
   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. _enabling-openmp:
   7
   8 Enabling OpenMP
   9 ---------------
  10
  11 To activate the OpenMP extensions for C/C++ and Fortran, the compile-time
  12 flag :command:`-fopenmp` must be specified.  This enables the OpenMP directive
  13 ``#pragma omp`` in C/C++ and ``!$omp`` directives in free form,
  14 ``c$omp``, ``*$omp`` and ``!$omp`` directives in fixed form,
  15 ``!$`` conditional compilation sentinels in free form and ``c$``,
  16 ``*$`` and ``!$`` sentinels in fixed form, for Fortran.  The flag also
  17 arranges for automatic linking of the OpenMP runtime library
  18 (:ref:`runtime-library-routines`).
  19
  20 A complete description of all OpenMP directives may be found in the
  21 `OpenMP Application Program Interface <https://www.openmp.org>`_ manuals.
  22 See also :ref:`openmp-implementation-status`.