You want something more like this:
#ifndef _GLOBAL_H_
#define _GLOBAL_H_ (1)
#ifdef DEFINE_SPACE_GLOBAL_H
#define EXTERN_GLOBAL
#else
#define EXTERN_GLOBAL extern
#endif
#if defined(__cplusplus) && __cplusplus
extern "C" {
#endif
EXTERN_GLOBAL u08 RX485_oldbyte3, RX485_oldbyte2, RX485_oldbyte1;
#if defined(__cplusplus) && __cplusplus
}
#endif
#endif /* _GLOBAL_H_ */
Then in global.c put:
#define DEFINE_SPACE_GLOBAL_H (1) /* This line goes in *ONLY* global.c! */
#include "global.h"
Now space will be allocated in global.c, but all other
files will get the proper 'extern'.
Do not put initialized data in a header file that is included
in multiple places. In this example the initialized data
belongs in global.c .
You can ignore the cplusplus stuff, that is just how
I have my emacs templates setup.
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