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<title>Using the GNU Compiler Collection (GCC): Preprocessing directives implementation</title>
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<a name="Preprocessing-directives-implementation"></a>
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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> [<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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<a name="Preprocessing-Directives"></a>
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<h3 class="section">4.13 Preprocessing Directives</h3>
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<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
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behavior</a> in <cite>The C Preprocessor</cite>, for details of these aspects of
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implementation-defined behavior.
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</p>
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<ul>
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<li> <cite>The locations within <code>#pragma</code> 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><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><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><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><li> <cite>The places that are searched for an included ‘<samp><></samp>’ 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><li> <cite>How the named source file is searched for in an included ‘<samp>""</samp>’
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delimited header (C90 6.8.2, C99 and C11 6.10.2).</cite>
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</li><li> <cite>The method by which preprocessing tokens (possibly resulting from
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macro expansion) in a <code>#include</code> 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><li> <cite>The nesting limit for <code>#include</code> processing (C90 6.8.2, C99
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and C11 6.10.2).</cite>
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</li><li> <cite>Whether the ‘<samp>#</samp>’ operator inserts a ‘<samp>\</samp>’ character before
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the ‘<samp>\</samp>’ 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><li> <cite>The behavior on each recognized non-<code>STDC #pragma</code>
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directive (C90 6.8.6, C99 and C11 6.10.6).</cite>
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<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Pragmas.html#Pragmas">Pragmas</a> in <cite>The C Preprocessor</cite>, for details of
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pragmas accepted by GCC on all targets. See <a href="Pragmas.html#Pragmas">Pragmas
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Accepted by GCC</a>, for details of target-specific pragmas.
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</p>
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</li><li> <cite>The definitions for <code>__DATE__</code> and <code>__TIME__</code> 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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</li></ul>
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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> [<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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