#ifdef ALLOCATE_EXTERN #define EXTERN #define _AT_ _at_ #else #define EXTERN extern #define _AT_ ;/ ## / #endif EXTERN xdata volatile BYTE GPIF_WAVE_DATA _AT_ 0xE400; EXTERN xdata volatile BYTE RES_WAVEDATA_END _AT_ 0xE480; ... // more than one hundred EXTERNs