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<h3 class="section">Preprocessing directives</h3>
<ul>
<li><cite>How sequences in both forms of header names are mapped to headers
or external source file names (6.4.7).</cite>
<li><cite>Whether the value of a character constant in a constant expression
that controls conditional inclusion matches the value of the same character
constant in the execution character set (6.10.1).</cite>
<li><cite>Whether the value of a single-character character constant in a
constant expression that controls conditional inclusion may have a
negative value (6.10.1).</cite>
<li><cite>The places that are searched for an included </cite><code><></code><cite> delimited
header, and how the places are specified or the header is
identified (6.10.2).</cite>
<li><cite>How the named source file is searched for in an included </cite><code>""</code><cite>
delimited header (6.10.2).</cite>
<li><cite>The method by which preprocessing tokens (possibly resulting from
macro expansion) in a </cite><code>#include</code><cite> directive are combined into a header
name (6.10.2).</cite>
<li><cite>The nesting limit for </cite><code>#include</code><cite> processing (6.10.2).</cite>
<p>GCC imposes a limit of 200 nested <code>#include</code>s.
</p><li><cite>Whether the </cite><code>#</code><cite> operator inserts a </cite><code>\</code><cite> character before
the </cite><code>\</code><cite> character that begins a universal character name in a
character constant or string literal (6.10.3.2).</cite>
<li><cite>The behavior on each recognized non-</cite><code>STDC #pragma</code><cite>
directive (6.10.6).</cite>
<li><cite>The definitions for </cite><code>__DATE__</code><cite> and </cite><code>__TIME__</code><cite> when
respectively, the date and time of translation are not available (6.10.8).</cite>
<p>If the date and time are not available, <code>__DATE__</code> expands to
<code>"??? ?? ????"</code> and <code>__TIME__</code> expands to
<code>"??:??:??"</code>.
</ul>
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