How do I fix this code?

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C++

main.cpp

#include "Login.h"

int main () {
    Loginf();
}

Login.h

#ifndef LOGIN_H
#define LOGIN_H
#include <string>
#include <iostream>

using namespace std;

void Loginf ();


class Login
{
public:

    Login ();
    string getInput () {
        return input;
    }
    void setInput (string x) {
        x=input;
    }
private:
    string input;
};

#endif

Login.cpp

#include "Login.h"


Login::Login () {};

void Loginf () {
    Login lo;
    lo.setInput("hello");
    cout << lo.getInput();
};

A simple program that i started with to display an input to the screen. However, when i build it, all i get is this:

mingw32-g++.exe  -o "bin\Debug\first project.exe" include\Login.h.gch obj\Debug\main.o obj\Debug\src\Login.o
include\Login.h.gch: file not recognized: File format not recognized
collect2.exe: error: ld returned 1 exit status
Process terminated with status 1 (0 minute(s), 0 second(s))
0 error(s), 0 warning(s) (0 minute(s), 0 second(s))

I have no idea why its giving me this. The reason for this program is to figure out how to use header files with functions prototypes and a class with an object so that i can create a program with a simple login. So, I need to keep the function and the class, I don't want to have to simply define the function in main or something like that.

So my question, to sum this up, is simply: why won't this code run, and what can I do to fix it without changing the format (main.cpp calls the function, login.h prototypes it and creates the class, login.cpp defines the function).