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<TITLE>Option: library</TITLE>
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<A HREF="toc.html">Table of Contents</A><P>
<P>Previous: <A HREF="intrinsic.html">-intrinsic</A><HR><P>
<H2>Option: <font color=#FF0080>library</font></H2><P>
<A NAME="library"></A><DT><B><A HREF="library.html">-library</A></B> </DT>
<DD>This switch is used when a number
of subprograms are contained in a file, but not all of them are used by
the application. Normally, <B>ftnchek </B> warns you if any subprograms are defined
but never used. This switch will suppress these warnings. Default = no.
<blockquote></DD>
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<P>
This switch also controls which subprogram calls and COMMON block declarations
are checked. If a file is read with the <B><A HREF="library.html">-library</A> </B> flag in effect, the subprogram
calls and COMMON declarations contained in a routine in that file will
be checked only if that routine is in the main program's call tree. On the
other hand, if the <B><A HREF="library.html">-library</A> </B> switch is turned off, then <B>ftnchek </B> checks
the calls of every routine by every other routine, regardless of whether
those routines could ever actually be invoked at run time, and likewise
all COMMON block declarations are compared for agreement. <P>
The difference
between this switch and the <B><A HREF="usage.html">-usage</A>=no-ext-unused </B> option for subprograms
is that the latter suppresses only the warning about routines being declared
but not used. The <B><A HREF="library.html">-library</A> </B> switch goes further and excludes unused routines
processed while it is in effect from all cross-checking of arguments and
COMMON block declarations as well. <P>
(If there is no main program anywhere
in the set of files that <B>ftnchek </B> has read, so that there is no call tree,
then <B>ftnchek </B> will look for any non-library routines that are not called
by any other routine, and use these as substitutes for the main program
in constructing the call tree and deciding what to check. If no such top-level
non-library routines are found, then all inter-module calls and all COMMON
declarations will be checked.) <P>
See also: <B><A HREF="arguments.html">-arguments</A> </B>, <B><A HREF="calltree.html">-calltree</A> </B>, <B><A HREF="common.html">-common</A>
</B>, <B><A HREF="extern.html">-extern</A> </B>, <B><A HREF="usage.html">-usage</A> </B>. </blockquote>
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