Why am I getting "ld: symbol(s) not found for architecture x86_64"

Question

I am a complete beginner to c++. I am learning c++ through the object oriented programming Data structures in c++. In the course I have the following program

Cube.h

#pragma once

class Cube {
  public:
    double getVolume();
    double getSurfaceArea();
    void setLength(double length);

  private:
    double length_;
};

Cube.cpp

#include "Cube.h"

double Cube::getVolume() {
  return length_ * length_ * length_;
}

double Cube::getSurfaceArea() {
  return 6 * length_ * length_;
}

void Cube::setLength(double length) {
  length_ = length;
}

main.cpp

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

int main() {
  Cube c;

  c.setLength(3.48);
  double volume = c.getVolume();

  std::cout << "Volume" << volume << std::endl;

  return 0;
}

When I make this program with make main, I get the following error message

c++     main.cpp   -o main
Undefined symbols for architecture x86_64:
  "Cube::getVolume()", referenced from:
      _main in main-6c5fe0.o
  "Cube::setLength(double)", referenced from:
      _main in main-6c5fe0.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [main] Error 1

Not sure what I am doing wrong. I am working from a macbook. I followed this link to run cpp programs in mac.

Not sure what I am doing wrong. An explanation to the error will also be nice.

Thanks in advance

Hello, you should complie also the Cube.cpp, like c++ *.cpp -o main. — g_bor, Sep 15 '20 at 14:29
its an interesting zoo of answers on [this question](https://stackoverflow.com/questions/221185/how-to-compile-and-run-c-c-in-a-unix-console-mac-terminal). for some reason all assume that you compile a single source file and don't apply in your case — 463035818_is_not_an_ai, Sep 15 '20 at 14:30
@idclev463035818 sorry for the ignorance. As I explained in the question, I am complete beginner and do not yet understand the errors. Have learnt this now — Sashaank, Sep 15 '20 at 14:33
@Sashaank no need to be sorry. Maybe the authors of the answers should be ;) — 463035818_is_not_an_ai, Sep 15 '20 at 14:34

score 3 · Accepted Answer · answered Sep 15 '20 at 14:29

3

You need to link main.cpp and Cube.cpp together, so you have to compile with:

c++ main.cpp Cube.cpp -o main

answered Sep 15 '20 at 14:29

Aplet123

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Why am I getting "ld: symbol(s) not found for architecture x86_64"

1 Answers1