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GNU C defines useful behavior for some constructs that are not allowed or well-defined in standard C.
| Function Prototypes: | Prototype declarations and old-style definitions. | |
| Pointer Arith: | Arithmetic on void-pointers and function pointers. |
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| Variadic Pointer Args: | Pointer arguments to variadic functions. | |
| Pointers to Arrays: | Pointers to arrays with qualifiers work as expected. | |
| Const and Volatile Functions: | GCC interprets these specially in C. |