Geany - undefined reference

Question

I am trying to compile C++ code with Geany.

Compile command: g++ -Wall -c "%f"

Build command: g++ -Wall -o "%e" "%f"

main.cpp:

#include <iostream>

#include "Person.hpp"

int main()
{
    Person p1(16);

    std::cout << p1.getAge();

    return 0;
}

Person.hpp

class Person
{
public:

    Person(int a);

    void setAge(int);

    int getAge() const;

private:

    int age;
};

inline int Person::getAge() const
{
    return age;
}

Person.cpp

#include "Person.hpp"

Person::Person(int a)
{
    age = a;
}

void Person::setAge(int a)
{
    age = a;
}

Error:

g++ -Wall -o "main" "main.cpp" (in directory: /home/me/projects/Test) /tmp/ccxYmWkE.o: In function main': main.cpp:(.text+0x15): undefined reference toPerson::Person(int)' collect2: error: ld returned 1 exit status Compilation failed.

Before Geany, I only used Code::Blocks and everything worked fine. How can I fix it?

Answer 1

It's obvious you didn't add Person.cpp to the compilation command. then it can not pass the linkage level.

Add -o Person Person.cpp to the build option after g++ -Wall -c "%e" "%f". After all the compile command should be something like below:

g++ -Wall -o "main" "main.cpp" -o Person Person.cpp