\section{Fortran Restrictions on \code{shared} and \code{private} Clauses with Common Blocks}

\label{sec:fort_sp_common}

When a named common block is specified in a \code{private}, \code{firstprivate},

or \code{lastprivate} clause of a construct, none of its members may be declared

in another data-sharing attribute clause on that construct. The following examples

illustrate this point.

The following example is conforming:

\fnexample{fort_sp_common}{1}

The following example is also conforming:

\fnexample{fort_sp_common}{2}

\begin{figure}[t!]

\linewitharrows{-1}{dashed}{Fortran (cont.)}{8em}

\end{figure}

The following example is conforming:

\fnexample{fort_sp_common}{3}

The following example is non-conforming because \code{x} is a constituent element

of \code{c}:

\fnexample{fort_sp_common}{4}

The following example is non-conforming because a common block may not be declared

both shared and private:

\fnexample{fort_sp_common}{5}