"multiple defined symbols error" when using stdafx.h with own headers

Asked Nov 25 '17 at 14:46

Active Nov 25 '17 at 14:57

Viewed 247 times

I have some own made headers but whenever I use them with "stdafx.h", vs throw multiple defined symbols error for the function defined in the headers,

stdafx.h be like:

#include <stdio.h>
#include <tchar.h>

#include "pUtils.h"
#include "pString.h"
#include "PodVector.h"

let's say I have a function defined in PodVector.h as test_PodVector()

then i got error like:

error LNK2005: "void __cdecl test_PODVector(void)" (?test_PODVector@@YAXXZ) already defined in ar.obj 1>ar.exe : fatal error LNK1169: one or more multiply defined symbols found

my main cpp file is like

#include "stdafx.h"

using namespace std;

int main() {    PodVector<int> vec;

    return 0; }

the errors go away if I make those functions static but why?

edited Nov 25 '17 at 14:57

asked Nov 25 '17 at 14:46

unknown.prince

1

You are aware that `#include ` always must be the 1st include statement? – user0042 Nov 25 '17 at 14:49
yes it is in main cpp file – unknown.prince Nov 25 '17 at 14:51
Provide a [MCVE] to get useful diagnosis of the problem here please. – user0042 Nov 25 '17 at 14:52
Are you possibly having some non-`inline` functions in the headers? – Bo Persson Nov 25 '17 at 14:56
yes they all are non-inline function – unknown.prince Nov 25 '17 at 14:56
Then make them inline instead of static. :-) `static` creates *different* copies of the functions in each file, which is not good either. – Bo Persson Nov 25 '17 at 14:57
Try adding #pragma once To your headers to prevent multiple definitions in your class declaration in the header file – Dr Deo Nov 25 '17 at 15:01
#pragma once is in every header, but anyway I understood from the answers given in above already asked question – unknown.prince Nov 25 '17 at 15:07

"multiple defined symbols error" when using stdafx.h with own headers

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