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| <title>The C Preprocessor: Traditional Mode</title> |
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| Next: <a href="Implementation-Details.html#Implementation-Details" accesskey="n" rel="next">Implementation Details</a>, Previous: <a href="Preprocessor-Output.html#Preprocessor-Output" accesskey="p" rel="prev">Preprocessor Output</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Directives.html#Index-of-Directives" title="Index" rel="index">Index</a>]</p> |
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| <h2 class="chapter">10 Traditional Mode</h2> |
| |
| <p>Traditional (pre-standard) C preprocessing is rather different from |
| the preprocessing specified by the standard. When GCC is given the |
| <samp>-traditional-cpp</samp> option, it attempts to emulate a traditional |
| preprocessor. |
| </p> |
| <p>GCC versions 3.2 and later only support traditional mode semantics in |
| the preprocessor, and not in the compiler front ends. This chapter |
| outlines the traditional preprocessor semantics we implemented. |
| </p> |
| <p>The implementation does not correspond precisely to the behavior of |
| earlier versions of GCC, nor to any true traditional preprocessor. |
| After all, inconsistencies among traditional implementations were a |
| major motivation for C standardization. However, we intend that it |
| should be compatible with true traditional preprocessors in all ways |
| that actually matter. |
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| <tr><td align="left" valign="top">• <a href="Traditional-lexical-analysis.html#Traditional-lexical-analysis" accesskey="1">Traditional lexical analysis</a>:</td><td> </td><td align="left" valign="top"> |
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| <tr><td align="left" valign="top">• <a href="Traditional-macros.html#Traditional-macros" accesskey="2">Traditional macros</a>:</td><td> </td><td align="left" valign="top"> |
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| <tr><td align="left" valign="top">• <a href="Traditional-miscellany.html#Traditional-miscellany" accesskey="3">Traditional miscellany</a>:</td><td> </td><td align="left" valign="top"> |
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| <tr><td align="left" valign="top">• <a href="Traditional-warnings.html#Traditional-warnings" accesskey="4">Traditional warnings</a>:</td><td> </td><td align="left" valign="top"> |
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