'How i have to configure VS Code to don't get a "undefined reference" error message?

My work environment :

EDI: Visual Studio Code

C ++ Compiler: GCC

Extensions:

Microsoft C / C ++

.run Code Runner

My source code :

main.cpp

#include <iostream>
#include "personne.h"

int main() {

 personne jojo("fabien");

 std::cout <<"la personne s'appelle "<<jojo.get_nom()<<" et a " 
 <<jojo.get_age()<<" ans "<<std::endl;

 personne titi("lena",3);

 std::cout <<"la personne s'appelle "<<titi.get_nom()<<" et a " 
 <<titi.get_age()<<" ans "<<std::endl;
}

personne.cpp

#include "personne.h"

std::string personne::get_nom() {
    return nom;
}
int personne::get_age() {
    return age;
}

personne::personne(std::string n){
    nom=n;
    age=0;
}

personne::personne(std::string n, int a) {
    nom=n;
    age=a;
}

personne.h

#ifndef __PERSONNE__
#define __PERSONNE__

#include <string>

class personne {
    std::string nom;
    int age;enter code here

public :
    std::string get_nom();
    int get_age();

    personne(std::string);
    personne(std::string, int);
};

#endif // __PERSONNE__

Errors messages :

Windows PowerShell Copyright (C) Microsoft Corporation. Tous droits réservés.

PS T:\VSCC++\LEssentiel> cd "t:\VSCC++\LEssentiel\chapitre 2 la programmation orientee objets\la_zim\" ; if ($?) { g++ main.cpp -o main } ; if ($?) { .\main } C:\Users\Pierre\AppData\Local\Temp\ccKhfKRw.o:main.cpp:(.text+0x4e): undefined reference to personne::personne(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)' C:\Users\Pierre\AppData\Local\Temp\ccKhfKRw.o:main.cpp:(.text+0x72): undefined reference topersonne::get_age()' C:\Users\Pierre\AppData\Local\Temp\ccKhfKRw.o:main.cpp:(.text+0x87): undefined reference to personne::get_nom[abi:cxx11]()' C:\Users\Pierre\AppData\Local\Temp\ccKhfKRw.o:main.cpp:(.text+0x137): undefined reference to personne::personne(std::__cxx11::basic_string, std::allocator >, int)' C:\Users\Pierre\AppData\Local\Temp\ccKhfKRw.o:main.cpp:(.text+0x15b): undefined reference to personne::get_age()' C:\Users\Pierre\AppData\Local\Temp\ccKhfKRw.o:main.cpp:(.text+0x170): undefined reference topersonne::get_nomabi:cxx11' collect2.exe: error: ld returned 1 exit status PS T:\VSCC++\LEssentiel\chapitre 2 la programmation orientee objets\la_zim>

c++visual-studio-code


Solution 1:[1]

you need to edit the task.json, generated by VScode. When you run a debuging of a simple .cpp file with a main function, the default configuration of tasks.json that´s enough, but if you try to use a personal headers files with classes, you need to indicate to tasks.json which extra files you program need to compile.

Like this:

  {
    "tasks": [
        {
            "type": "shell",
            "label": "g++ build active file",
            "command": "/usr/bin/g++",
            "args": [
                "-g",
                "${file}","${fileDirname}/Node.cpp", <============= HERE <======
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}"
            ],
            "options": {
                "cwd": "/usr/bin"
            }
        }
    ],
    "version": "2.0.0"
}

In the secction args, I just added the full path of my extra file .cpp (ej."${fileDirname}/extrefile.cpp").

Save the tasks.json and run again the Debugging with F5, from the cpp file with main function.

Solution 2:[2]

You need to compile and li k with personne.cpp. Add it to your project so that the command line mentions all your source files.

Solution 3:[3]

I have the same problem and it seems a linker error. You should use the terminal embedded in vsc and build your file using the string g++ -g -o main main.cpp personne.cpp
Then simply execute the executable file called main. You should also try to add the file personne.cpp to tasks.json file

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 codemirror
Solution 2 Matthieu Brucher
Solution 3 Biga

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