Visual Studio Code can't find reference to function [duplicate] - c++

Question

This question already has answers here:
What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
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I'm trying to use Visual Studio for a specific project but I can't get files to link properly.
When including a header file with a defined function in another cpp file im getting an error undefined reference to testFunc() collect2.exe: error: ld returned 1 exit status
Thing is, this exact same code works perfectly in Eclipse. Can someone tell me what I'm doing wrong?
Test.cpp
#include "Other.h"
int main(){
testFunc();
return 0;
}
Other.h
#pragma once
void testFunc();
Other.cpp
#include "Other.h"
#include <iostream>
using namespace std;
void testFunc(){
cout << "HelloWorld";
}
When Buildung, this occours:
Starting build...
C:\MinGW\bin\g++.exe -fdiagnostics-color=always -g C:\Users\johan\cu-workspace\TEst\Test.cpp -o C:\Users\johan\cu-workspace\TEst\Test.exe
C:\Users\johan\AppData\Local\Temp\cck3aAZo.o: In function `main':
C:/Users/johan/cu-workspace/TEst/Test.cpp:5: undefined reference to `testFunc()'
collect2.exe: error: ld returned 1 exit status
Build finished with error(s).

Answer 1

If you build Other.h and Other.cpp as a project, then you need to configure the linker to add Other.lib into test project.
For a simple scenario, you can have all 3 files in one project and they should build just fine.

Answer 2

According to your build info:
C:\MinGW\bin\g++.exe -fdiagnostics-color=always -g C:\Users\johan\cu-workspace\TEst\Test.cpp -o C:\Users\johan\cu-workspace\TEst\Test.exe
You can see that Other.cpp is not in your project, so you might need to add it into your project.
Since you are using VS code, you can write a simple command in terminal to build your code:
C:\MinGW\bin\g++.exe -g C:\Users\johan\cu-workspace\TEst\Test.cpp C:\Users\johan\cu-workspace\TEst\Other.cpp -o C:\Users\johan\cu-workspace\TEst\Test.exe