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<TITLE>Option: extern</TITLE>
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<A HREF="toc.html">Table of Contents</A><P>
<P>Previous: <A HREF="errors.html">-errors</A><HR><P>
<H2>Option: <font color=#FF0080>extern</font></H2><P>
<A NAME="extern"></A><DT><B><A HREF="extern.html">-extern</A></B>
<DD>
<DL COMPACT><DT><DD>
Causes <B>ftnchek</B> to report whether any subprograms
invoked by the program are never defined.
Ordinarily, if <B>ftnchek</B> is being run on a complete program, each
subprogram other than the intrinsic functions should be defined
somewhere. Turn off this switch if you just want to
check a subset of files which form part of a larger complete program.
Subprogram arguments will still be
checked for correctness. Default = yes.
<P>
The <B><A HREF="extern.html">-extern</A></B> flag is now superseded by the
<B><A HREF="usage.html">-usage</A>=ext-undefined</B> option. For the sake of convenience, the
<B><A HREF="extern.html">-extern</A></B> flag is retained, so that <B>-noextern</B> is
equivalent to <B><A HREF="usage.html">-usage</A>=no-ext-undefined</B> option. The
<B><A HREF="extern.html">-extern</A></B> switch may be retired eventually.
<P>
See also: <B><A HREF="library.html">-library</A></B>.
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<P><HR><P>Next: <A HREF="f77.html">-f77</A>
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