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As the first stage of compiling a C source module, GCC transforms the text with text substitutions and file inclusions. This is called preprocessing.
| • Preproc Overview | ||
| • Directives | ||
| • Preprocessing Tokens | ||
| • Header Files | ||
| • Macros | ||
| • Conditionals | ||
| • Diagnostics | ||
| • Line Control | ||
| • Null Directive |