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<a name="Enabling-OpenMP-1"></a>
<h2 class="chapter">1 Enabling OpenMP</h2>

<p>To activate the OpenMP extensions for C/C++ and Fortran, the compile-time 
flag <code>-fopenmp</code> must be specified.  This enables the OpenMP directive
<code>#pragma omp</code> in C/C++ and <code>!$omp</code> directives in free form, 
<code>c$omp</code>, <code>*$omp</code> and <code>!$omp</code> directives in fixed form, 
<code>!$</code> conditional compilation sentinels in free form and <code>c$</code>,
<code>*$</code> and <code>!$</code> sentinels in fixed form, for Fortran.  The flag also
arranges for automatic linking of the OpenMP runtime library 
(<a href="Runtime-Library-Routines.html#Runtime-Library-Routines">Runtime Library Routines</a>).
</p>
<p>A complete description of all OpenMP directives accepted may be found in 
the <a href="http://www.openmp.org">OpenMP Application Program Interface</a> manual,
version 4.5.
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