From: Mark Phillips <umphill5 AT cs DOT umanitoba DOT ca>
Newsgroups: comp.os.msdos.djgpp
Subject: and another thing...
Date: Wed, 26 May 1999 11:56:59 -0500
Organization: The University of Manitoba
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To: djgpp AT delorie DOT com
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Why should I get this:

Compiling: h.cc
no errors
Compiling: main.cc
no errors
Creating: test.exe
Error: main.o(.data+0x0):main.cc: multiple definition of 'foo'
Error: h.o(.data+0x0):h.cc first defined here

When I do this:

// file #1 main.cc
#include "header.h"

int main()
{
   fun1();
   return 0;
}

// file #2 h.cc
#include "header.h"

void fun1()
{
   foo = 1;
}

// file #3 header.h
#ifndef HEADER_H
#define HEADER_H

void fun1();
bool foo;

#endif


Shouldn't the preprocessor directives in 'header.h' handle the multiple
declaration linking errors?


love
mark