*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS

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I have Declared all my declaration in one file called ADeclaration.h and included this file in all my module C files.

i.e.

I have

VB

MAIN.c (MAIN)
 Port_IO.c (PORT_IO)
 STORAGE.c (STORAGE)
 TEMPERATURE.c (TEMPERATURE)
 CONVERT.c (CONVERT)
 UART.c (UART)
 RTC.c (RTC)
 I2C.c (I2C)
 ISR.c(ISR)
 FLASH.c (FLASH)

All the declaration of this files are in Adeclaration.h

Now I am getting my project.M51 with
Program Size: data=157.5 xdata=5988 code=11148
LINK/LOCATE RUN COMPLETE. 29 WARNING(S), 294 ERROR(S)

and the target is not created

most of the error are like

VB

*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS
    SYMBOL:  LOCAL
    MODULE:  STORAGE.obj

Posted 12-Oct-10 19:27pm

Swapnil_katre

Updated 12-Oct-10 22:46pm

Dalek Dave

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Dalek Dave 13-Oct-10 4:46am

Minor Edit for Grammar.

2 solutions

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CPallini · Answer 1 · 2010-10-12T22:51:00

The linker complains about multiple definitions, not declarations.
If you need to use a symbol (for instance a variable) in multiple sources then you have to:

Define it in one, single source.
Declare it, as extern in all the other sources (you may include an header file for the purpose).

e.g.:

header file decl.h

#ifndef _DECL_H_
#define _DECL_H_
/* global symbol declarations */
extern int global_counter;
/*...*/
#endif

source file src1.c

/* global symbol definition */
int global_counter; 
/*...*/

source file src2.c

#include "decl.h"

/* use the global symbol */
int increment()
{
  global_counter++;
}
/*...*/

and so on...

:)

E.F. Nijboer · Answer 2 · 2010-10-12T21:48:00

Solution 1

Simply put this in your ADeclaration.h to avoid multiple inclusions:

#ifndef ADECLARATION_H
#define ADECLARATION_H

 // Contents of ADeclaration.h 

#endif

Good luck!

Posted 12-Oct-10 21:48pm

E.F. Nijboer

Updated 12-Oct-10 22:02pm

v2