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| <h2 class="chapter">10 Traditional Mode</h2> |
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| <p>Traditional (pre-standard) C preprocessing is rather different from |
| the preprocessing specified by the standard. When GCC is given the |
| <samp><span class="option">-traditional-cpp</span></samp> option, it attempts to emulate a traditional |
| preprocessor. |
| |
| <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>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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