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107 lines
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107 lines
5.3 KiB
HTML
4 years ago
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<title>Preprocessing directives implementation - Using the GNU Compiler Collection (GCC)</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<link rel="up" href="C-Implementation.html#C-Implementation" title="C Implementation">
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<link rel="prev" href="Statements-implementation.html#Statements-implementation" title="Statements implementation">
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<link rel="next" href="Library-functions-implementation.html#Library-functions-implementation" title="Library functions implementation">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<body>
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<div class="node">
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<a name="Preprocessing-directives-implementation"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Library-functions-implementation.html#Library-functions-implementation">Library functions implementation</a>,
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Previous: <a rel="previous" accesskey="p" href="Statements-implementation.html#Statements-implementation">Statements implementation</a>,
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Up: <a rel="up" accesskey="u" href="C-Implementation.html#C-Implementation">C Implementation</a>
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<hr>
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</div>
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<h3 class="section">4.13 Preprocessing Directives</h3>
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<p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>, for details of these aspects of
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implementation-defined behavior.
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<ul>
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<li><cite>The locations within </cite><code>#pragma</code><cite> directives where header name
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preprocessing tokens are recognized (C11 6.4, C11 6.4.7).</cite>
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<li><cite>How sequences in both forms of header names are mapped to headers
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or external source file names (C90 6.1.7, C99 and C11 6.4.7).</cite>
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<li><cite>Whether the value of a character constant in a constant expression
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that controls conditional inclusion matches the value of the same character
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constant in the execution character set (C90 6.8.1, C99 and C11 6.10.1).</cite>
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<li><cite>Whether the value of a single-character character constant in a
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constant expression that controls conditional inclusion may have a
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negative value (C90 6.8.1, C99 and C11 6.10.1).</cite>
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<li><cite>The places that are searched for an included ‘</cite><samp><span class="samp"><></span></samp><cite>’ delimited
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header, and how the places are specified or the header is
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identified (C90 6.8.2, C99 and C11 6.10.2).</cite>
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<li><cite>How the named source file is searched for in an included ‘</cite><samp><span class="samp">""</span></samp><cite>’
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delimited header (C90 6.8.2, C99 and C11 6.10.2).</cite>
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<li><cite>The method by which preprocessing tokens (possibly resulting from
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macro expansion) in a </cite><code>#include</code><cite> directive are combined into a header
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name (C90 6.8.2, C99 and C11 6.10.2).</cite>
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<li><cite>The nesting limit for </cite><code>#include</code><cite> processing (C90 6.8.2, C99
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and C11 6.10.2).</cite>
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<li><cite>Whether the ‘</cite><samp><span class="samp">#</span></samp><cite>’ operator inserts a ‘</cite><samp><span class="samp">\</span></samp><cite>’ character before
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the ‘</cite><samp><span class="samp">\</span></samp><cite>’ character that begins a universal character name in a
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character constant or string literal (C99 and C11 6.10.3.2).</cite>
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<li><cite>The behavior on each recognized non-</cite><code>STDC #pragma</code><cite>
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directive (C90 6.8.6, C99 and C11 6.10.6).</cite>
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<p>See <a href="../cpp/Pragmas.html#Pragmas">Pragmas</a>, for details of
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pragmas accepted by GCC on all targets. See <a href="Pragmas.html#Pragmas">Pragmas Accepted by GCC</a>, for details of target-specific pragmas.
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<li><cite>The definitions for </cite><code>__DATE__</code><cite> and </cite><code>__TIME__</code><cite> when
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respectively, the date and time of translation are not available (C90
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6.8.8, C99 6.10.8, C11 6.10.8.1).</cite>
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</ul>
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</body></html>
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