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RE: [avr-gcc-list] (no subject)

From: MuRaT KaRaDeNiZ
Subject: RE: [avr-gcc-list] (no subject)
Date: Mon, 30 Jan 2006 23:39:11 +0200


U08 RX485_oldbyte1; is uninitialized data, but compiler also initialize
it to zero, why is it different from inline initialization during
declaration, I expect the compiler just replace the zero with the
initial value i provide?


Murat Karadeniz

-----Original Message-----
From: Bob Paddock [mailto:address@hidden 
Sent: Monday, January 30, 2006 11:18 PM
To: MuRaT KaRaDeNiZ
Cc: 'AVR-GCC-list'
Subject: Re: [avr-gcc-list] (no subject)

You want something more like this:

#ifndef _GLOBAL_H_
#define _GLOBAL_H_ (1)

#define EXTERN_GLOBAL extern

#if defined(__cplusplus) && __cplusplus
  extern "C" {

EXTERN_GLOBAL u08 RX485_oldbyte3, RX485_oldbyte2, RX485_oldbyte1;

#if defined(__cplusplus) && __cplusplus

#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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