undefined reference to Class::Function() C++

Question

After searching for a solution to this for about a half an hour I have made no progress. The errors are as follows:

s\My Workspace\Project\main.cpp - Line 7 - undefined reference to 'Sally::Sally()'

s\My Workspace\Project\main.cpp - Line 9 - undefined reference to 'Sally::printCrap()'

main.cpp

#include <iostream>
using namespace std;
#include "Sally.h"

int main()
{
    Sally sallyObject;
    sallyObject.printCrap();
}

Sally.h

#ifndef SALLY_H
#define SALLY_H


class Sally
{
    public:
        Sally();
        void printCrap();
};

#endif // SALLY_H

Sally.cpp

#include "Sally.h"
#include <iostream>
using namespace std;

Sally::Sally(){
}

void Sally::printCrap(){
    cout << "Did someone say steak?" << endl;
}

Thank you in advance!

The linker can't find definitions to the mentioned functions. Is your .cpp file included in the project you're using? — Tas, Jan 24 '16 at 22:33
It looks like `Sally.cpp` is not part of the project that your are building. — drescherjm, Jan 24 '16 at 22:33
How are you building this..? Makefile..? directly using gcc..? — Loki, Jan 24 '16 at 22:53
@Tas how can i tell? The files are all under the same project in code::blocks — Deck, Jan 24 '16 at 23:15

score 2 · Answer 1 · edited Jul 03 '18 at 19:11

I know this is a pretty old question but maybe it could help someone.

So, when adding any additional files (headers, source, etc.) follow this (if using Eclipse or similar IDE):

New file -> File... -> C/C++ header (source, etc.) -> next, next -> give it a name and make sure it's in the same path with your project, then check "Add file to active project", in build target(s): check all -> Finish.

Hope it helps.

score 1 · Answer 2 · edited May 23 '17 at 12:31

1

Your linker doesn't find Sally.cpp. (Quick intro to linker)

To compile your code type:

g++ -o main main.cpp Sally.cpp

edited May 23 '17 at 12:31

Community

1
1

answered Jan 24 '16 at 23:28

Jannik Becher

189
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undefined reference to Class::Function() C++

2 Answers2