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   sc_specifiers - auto static extern register

   These  are  storage class specifiers.  Declarations  using  the  auto,
   static  and register specifiers also serve as definitions in that they
   cause an appropriate amount of storage to be reserved.

   If  an  extern  declaration  is not a  definition,  there  must  be  a
   definition for the given identifiers somewhere else.

   A register declaration is best thought of as an auto declaration,  the
   address operator & can not be applied to them.

   The  auto or register specifiers can only be used for names of objects
   declared in a block and for formal arguments.  There can be no  static
   functions within a block, nor any static formal arguments.

   The  static or extern specifiers can only be used for names of objects
   or functions.