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| <a name="Preprocessing-Directives"></a> |
| <h3 class="section">4.13 Preprocessing Directives</h3> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined |
| behavior</a> in <cite>The C Preprocessor</cite>, for details of these aspects of |
| implementation-defined behavior. |
| </p> |
| <ul> |
| <li> <cite>The locations within <code>#pragma</code> directives where header name |
| preprocessing tokens are recognized (C11 6.4, C11 6.4.7).</cite> |
| |
| </li><li> <cite>How sequences in both forms of header names are mapped to headers |
| or external source file names (C90 6.1.7, C99 and C11 6.4.7).</cite> |
| |
| </li><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 (C90 6.8.1, C99 and C11 6.10.1).</cite> |
| |
| </li><li> <cite>Whether the value of a single-character character constant in a |
| constant expression that controls conditional inclusion may have a |
| negative value (C90 6.8.1, C99 and C11 6.10.1).</cite> |
| |
| </li><li> <cite>The places that are searched for an included ‘<samp><></samp>’ delimited |
| header, and how the places are specified or the header is |
| identified (C90 6.8.2, C99 and C11 6.10.2).</cite> |
| |
| </li><li> <cite>How the named source file is searched for in an included ‘<samp>""</samp>’ |
| delimited header (C90 6.8.2, C99 and C11 6.10.2).</cite> |
| |
| </li><li> <cite>The method by which preprocessing tokens (possibly resulting from |
| macro expansion) in a <code>#include</code> directive are combined into a header |
| name (C90 6.8.2, C99 and C11 6.10.2).</cite> |
| |
| </li><li> <cite>The nesting limit for <code>#include</code> processing (C90 6.8.2, C99 |
| and C11 6.10.2).</cite> |
| |
| </li><li> <cite>Whether the ‘<samp>#</samp>’ operator inserts a ‘<samp>\</samp>’ character before |
| the ‘<samp>\</samp>’ character that begins a universal character name in a |
| character constant or string literal (C99 and C11 6.10.3.2).</cite> |
| |
| </li><li> <cite>The behavior on each recognized non-<code>STDC #pragma</code> |
| directive (C90 6.8.6, C99 and C11 6.10.6).</cite> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Pragmas.html#Pragmas">Pragmas</a> in <cite>The C Preprocessor</cite>, for details of |
| pragmas accepted by GCC on all targets. See <a href="Pragmas.html#Pragmas">Pragmas |
| Accepted by GCC</a>, for details of target-specific pragmas. |
| </p> |
| </li><li> <cite>The definitions for <code>__DATE__</code> and <code>__TIME__</code> when |
| respectively, the date and time of translation are not available (C90 |
| 6.8.8, C99 6.10.8, C11 6.10.8.1).</cite> |
| |
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