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  70. <a name="Preprocessing-directives-implementation"></a>

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  73. Next: <a href="Library-functions-implementation.html#Library-functions-implementation" accesskey="n" rel="next">Library functions implementation</a>, Previous: <a href="Statements-implementation.html#Statements-implementation" accesskey="p" rel="prev">Statements implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>

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  76. <a name="Preprocessing-Directives"></a>

  77. <h3 class="section">4.13 Preprocessing Directives</h3>

  78. 

  79. <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined

  80. behavior</a> in <cite>The C Preprocessor</cite>, for details of these aspects of

  81. implementation-defined behavior.

  82. </p>

  83. <ul>

  84. <li> <cite>The locations within <code>#pragma</code> directives where header name

  85. preprocessing tokens are recognized (C11 6.4, C11 6.4.7).</cite>

  86. 

  87. </li><li> <cite>How sequences in both forms of header names are mapped to headers

  88. or external source file names (C90 6.1.7, C99 and C11 6.4.7).</cite>

  89. 

  90. </li><li> <cite>Whether the value of a character constant in a constant expression

  91. that controls conditional inclusion matches the value of the same character

  92. constant in the execution character set (C90 6.8.1, C99 and C11 6.10.1).</cite>

  93. 

  94. </li><li> <cite>Whether the value of a single-character character constant in a

  95. constant expression that controls conditional inclusion may have a

  96. negative value (C90 6.8.1, C99 and C11 6.10.1).</cite>

  97. 

  98. </li><li> <cite>The places that are searched for an included &lsquo;<samp>&lt;&gt;</samp>&rsquo; delimited

  99. header, and how the places are specified or the header is

  100. identified (C90 6.8.2, C99 and C11 6.10.2).</cite>

  101. 

  102. </li><li> <cite>How the named source file is searched for in an included &lsquo;<samp>&quot;&quot;</samp>&rsquo;

  103. delimited header (C90 6.8.2, C99 and C11 6.10.2).</cite>

  104. 

  105. </li><li> <cite>The method by which preprocessing tokens (possibly resulting from

  106. macro expansion) in a <code>#include</code> directive are combined into a header

  107. name (C90 6.8.2, C99 and C11 6.10.2).</cite>

  108. 

  109. </li><li> <cite>The nesting limit for <code>#include</code> processing (C90 6.8.2, C99

  110. and C11 6.10.2).</cite>

  111. 

  112. </li><li> <cite>Whether the &lsquo;<samp>#</samp>&rsquo; operator inserts a &lsquo;<samp>\</samp>&rsquo; character before

  113. the &lsquo;<samp>\</samp>&rsquo; character that begins a universal character name in a

  114. character constant or string literal (C99 and C11 6.10.3.2).</cite>

  115. 

  116. </li><li> <cite>The behavior on each recognized non-<code>STDC #pragma</code>

  117. directive (C90 6.8.6, C99 and C11 6.10.6).</cite>

  118. 

  119. <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Pragmas.html#Pragmas">Pragmas</a> in <cite>The C Preprocessor</cite>, for details of

  120. pragmas accepted by GCC on all targets.  See <a href="Pragmas.html#Pragmas">Pragmas

  121. Accepted by GCC</a>, for details of target-specific pragmas.

  122. </p>

  123. </li><li> <cite>The definitions for <code>__DATE__</code> and <code>__TIME__</code> when

  124. respectively, the date and time of translation are not available (C90

  125. 6.8.8, C99 6.10.8, C11 6.10.8.1).</cite>

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