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Node:<a name="Traditional%20miscellany">Traditional miscellany</a>,
Next:<a rel="next" accesskey="n" href="Traditional-warnings.html#Traditional%20warnings">Traditional warnings</a>,
Previous:<a rel="previous" accesskey="p" href="Traditional-macros.html#Traditional%20macros">Traditional macros</a>,
Up:<a rel="up" accesskey="u" href="Traditional-Mode.html#Traditional%20Mode">Traditional Mode</a>
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<h3 class="section">Traditional miscellany</h3>
<p>Here are some things to be aware of when using the traditional
preprocessor.
<ul>
<li>Preprocessing directives are recognized only when their leading
<code>#</code> appears in the first column. There can be no whitespace
between the beginning of the line and the <code>#</code>, but whitespace can
follow the <code>#</code>.
<li>A true traditional C preprocessor does not recognize <code>#error</code> or
<code>#pragma</code>, and may not recognize <code>#elif</code>. CPP supports all
the directives in traditional mode that it supports in ISO mode,
including extensions, with the exception that the effects of
<code>#pragma GCC poison</code> are undefined.
<li>__STDC__ is not defined.
<li>If you use digraphs the behavior is undefined.
<li>If a line that looks like a directive appears within macro arguments,
the behavior is undefined.
</ul>
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