%\pagebreak
\section{Conditional Compilation}
\label{sec:cond_comp}
\index{conditional compilation!_OPENMP macro@\kcode{_OPENMP} macro}
\index{conditional compilation!sentinel}

\begin{ccppspecific}
The following example illustrates the use of conditional compilation using the 
OpenMP macro \kcode{_OPENMP}. With OpenMP compilation, the \kcode{_OPENMP} 
macro becomes defined.

\cnexample{cond_comp}{1}
\end{ccppspecific}

\begin{fortranspecific}
The following example illustrates the use of the conditional compilation sentinel. 
With OpenMP compilation, the conditional compilation sentinel \scode{!$} is recognized 
and treated as two spaces. In fixed form source, statements guarded by the sentinel 
must start after column 6.

\fnexample{cond_comp}{1}
\end{fortranspecific}