Question

There was a week I’m learning and reading how to use my own static library in C++ and it’s driving me crazy. I’m using Ubuntu and I have a class in /home/myFiles/lib I want to build my library:

//MyClass.h
//---------------------------------------------
#ifndef MYCLASS_H_
#define MYCLASS_H_

class MyClass {
public:
    int a;

    MyClass();
    virtual ~MyClass();
};

#endif

And

//MyClass.cpp
//------------------------------------------
#include "MyClass.h"

MyClass::MyClass() {
    a = 3;
}

MyClass::~MyClass() {
}
//------------------------------------------

And a test file in /home/myFiles/main where I want to use the library:

// test.cpp
//-------------------------------------------------
#include <iostream>
using namespace std;

#include "MyClass.h"

int main() {
    MyClass c = MyClass;

    cout << "Hello World!!!" << c.a << endl;
    return 0;
}
//----------------------------------------------

Using Ubuntu console I type:

In lib folder: g++ -c MyClass.cpp
ar rsc libTesting.a MyClass.o

In test folder: g++ -c test.cpp -lTesting -L/home/myFiles/lib

Then It returns: test.cpp: error: MyClass.h: No such file or directory

If I write:
g++ -o test.cpp -lTesting -L/home/myFiles/lib

It deletes my file test.cpp

I know there is a lot of information about this but I don’t understand why it don’t recognize the #include "MyClass.h" and how can I use this using only the library without include the path with -I/home/myFiles/lib.

Thank you.

Answer 1

you havn’t indicate the include path, so gnu report the error.

try to add -I for your include path, or copy the .h file to your source directory.