bdata across multiple files?

I have data that I would like to efficiently address as both a byte and as 8 bits.
The bdata type sounds like the way to go, but I can not make it work across multiple files.
This program fails to compile and link. Any ideas?

// main.h
extern char bdata Main_Bits;
sfr Main_Bit0 = Main_Bits ^ 0;

#include "main.h"
char bdata Main_Bits;

void FnA( void );  
void main( void )
  Main_Bits = 0;

#include "main.h"
void FnA( void )
  Main_Bit0 = 1;

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