<powerpc/va-ppc.h>, which is much of what <stdarg.h> turns into on
macppc, says, in part,

/* Note that the names in this structure are in the user's namespace, but
   that the V.4 abi explicitly states that these names should be used.  */
typedef struct __gnuc_va_list__ {
  char gpr;			/* index into the array of 8 GPRs stored in the
				   register save area gpr=0 corresponds 
				   to r3,
				   gpr=1 to r4, etc. */
  char fpr;			/* index into the array of 8 FPRs stored in the
				   register save area fpr=0 corresponds 
				   to f1,
				   fpr=1 to f2, etc. */
  char *overflow_arg_area;	/* location on stack that holds the next
				   overflow argument */
  char *reg_save_area;		/* where r3:r10 and f1:f8, if saved are stored */
} __gnuc_va_list[1];

How on earth can an abi - abi, not api - have anything whatever to say
about struct element names?  What am I missing?

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