linkages in function and object

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/* object */	  /* function */

int o1;		  int f1();		/* external linkage */
static int o2;	  static int f2();	/* internal linkage */
static int o3;	  static int f3();	/* internal linkage */

static int o1;	  static int f1();	/* ERROR, both have external linkage */
int o2;					/* ERROR, o2 has internal linkage */
		  int f2();		/* OK, picks up internal linkage */
extern int o3;	  extern int f3();	/* OK, both pick up internal linkage */

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