(gcc.info.gz) Pointer Arith

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 5.20 Arithmetic on `void'- and Function-Pointers
 ================================================
 
 In GNU C, addition and subtraction operations are supported on pointers
 to `void' and on pointers to functions.  This is done by treating the
 size of a `void' or of a function as 1.
 
  A consequence of this is that `sizeof' is also allowed on `void' and
 on function types, and returns 1.
 
  The option `-Wpointer-arith' requests a warning if these extensions
 are used.
 

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