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<div class="section-level-extent" id="Library-functions-implementation"> <div class="nav-panel"> <p> Next: <a href="architecture-implementation" accesskey="n" rel="next">Architecture</a>, Previous: <a href="preprocessing-directives-implementation" accesskey="p" rel="prev">Preprocessing Directives</a>, Up: <a href="c-implementation" accesskey="u" rel="up">C Implementation-Defined Behavior</a> [<a href="index#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="indices" title="Index" rel="index">Index</a>]</p> </div>  <h1 class="section" id="Library-Functions"><span>4.14 Library Functions<a class="copiable-link" href="#Library-Functions"> ¶</a></span></h1> <p>The behavior of most of these points are dependent on the implementation of the C library, and are not defined by GCC itself. </p> <ul class="itemize mark-bullet"> <li>The null pointer constant to which the macro <code class="code">NULL</code> expands (C90 7.1.6, C99 7.17, C11 7.19). <p>In <code class="code">&lt;stddef.h&gt;</code>, <code class="code">NULL</code> expands to <code class="code">((void *)0)</code>. GCC does not provide the other headers which define <code class="code">NULL</code> and some library implementations may use other definitions in those headers. </p> </li>
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