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+<title>The C Preprocessor: Traditional miscellany</title>
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+Next: <a href="Traditional-warnings.html#Traditional-warnings" accesskey="n" rel="next">Traditional warnings</a>, Previous: <a href="Traditional-macros.html#Traditional-macros" accesskey="p" rel="previous">Traditional macros</a>, Up: <a href="Traditional-Mode.html#Traditional-Mode" accesskey="u" rel="up">Traditional Mode</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Directives.html#Index-of-Directives" title="Index" rel="index">Index</a>]</p>
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+<hr>
+<a name="Traditional-miscellany-1"></a>
+<h3 class="section">10.3 Traditional miscellany</h3>
+
+<p>Here are some things to be aware of when using the traditional
+preprocessor.
+</p>
+<ul>
+<li> Preprocessing directives are recognized only when their leading
+&lsquo;<samp>#</samp>&rsquo; appears in the first column. There can be no whitespace
+between the beginning of the line and the &lsquo;<samp>#</samp>&rsquo;, but whitespace can
+follow the &lsquo;<samp>#</samp>&rsquo;.
+
+</li><li> A true traditional C preprocessor does not recognize &lsquo;<samp>#error</samp>&rsquo; or
+&lsquo;<samp>#pragma</samp>&rsquo;, and may not recognize &lsquo;<samp>#elif</samp>&rsquo;. CPP supports all
+the directives in traditional mode that it supports in ISO mode,
+including extensions, with the exception that the effects of
+&lsquo;<samp>#pragma GCC poison</samp>&rsquo; are undefined.
+
+</li><li> __STDC__ is not defined.
+
+</li><li> If you use digraphs the behavior is undefined.
+
+</li><li> If a line that looks like a directive appears within macro arguments,
+the behavior is undefined.
+
+</li></ul>
+
+
+
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