C++ Getting undefined symbol error - c++

Question

I am trying to do an assignment and the program compiles fine on my home
PC (Netbeans) but when I try and compile on the Uni Sun box I get the following error
compile flags : g++ -lm -ansi -Wall -pedantic skyhigh.cpp -o skyhigh
Undefined first referenced
symbol in file
Flight::GetSeats() /var/tmp//cc49OAwj.o
Flight::GetCost() /var/tmp//cc49OAwj.o
Flight::GetAircraft() /var/tmp//cc49OAwj.o
ld: fatal: Symbol referencing errors. No output written to skyhigh
collect2: ld returned 1 exit status
Any help would be greatly appreciated,as I have spent hours combing the internet
for the solution
FLIGHT.H File
//
// flight.h
//
// Parent Flight class
//
#ifndef __FLIGHT_H__
#define __FLIGHT_H__
#include<iostream>
#include<string>
using namespace std;
/*TO DO REQUIRED HEADER FILES AND NAMESPACES*/
class Flight
{
protected:
string aircraft;
string category;
int seats;
double cost;
public:
virtual ~Flight(){};
// virtual void Display() =0;
void SetAircraftType(string air);
string GetAircraft();
int GetSeats();
double GetCost();
void SetSeats(int seat);
//TO DO
// Prototypes of all the Item functions
};
#endif
FLIGHT.CPP FILE
#include "flight.h"
string Flight::GetAircraft(){
return aircraft;
}
int Flight::GetSeats(){
return seats;
}
double Flight::GetCost(){
return cost;
}
void Flight::SetSeats(int seat){
seats=seat;
}
void Flight::SetAircraftType(string category){
aircraft = category;
}
MAIN FILE
// skyhigh.cpp for CPT 323 Assignment 1 SP3 2013
//
//
// CPT323 2013 assignment 1
#include "skyhigh.h"
/////////////////////////////////////////////////////
int main()
{
Flight newflight ;
cout<< "Plane Name:" <<newflight.GetAircraft()<< " Seats: "<< newflight.GetSeats()<<"Cost: "<<newflight.GetCost()<< endl;
Scenic newflight2 ;
//cout<< "Plane Name:" <<newflight2.GetAircraft()<< " Seats: "<< newflight2.GetSeats()<<"Cost: "<<newflight2.GetCost()<< endl;
//Scenic* sptr=&newflight2;
//BookingSheet booking;
//cout<< booking.GetDay()<<booking.GetTime()<<booking.GetPassengerName()<<booking.GetPaymentStatus()<<endl;
int finished = 0;
do {
/*Create array for use in menu options*/
cout << "Main Menu : " <<endl;
cout << "1) Add a flight booking "<<endl;
cout << "2) Remove a flight booking "<<endl;
cout << "3) View current booking sheet " <<endl;
cout << "0) Exit \n" <<endl;
cout<< "Please make a selection (0-3) ";
int selection;
cin>> selection;
/*Capture user selection default in switch statement validates 1-9*/
// fgets(option,sizeof(option),stdin);
//
//
switch (selection) {
case 0:
cout << "Thanks for using the SkyHigh Booking System"<<endl;
finished=1;
break;
case 1:
cout << "1) Add a flight booking "<<endl;
break;
case 2:
cout << "2) Add Customer "<<endl;
break;
case 3:
cout << "3) Display Stock " <<endl;
break;
default:
printf("Valid input is 0-3 \n");
}
}
while(!finished);
return 0;
}
MakeFile
skyhigh: skyhigh.o utility1.o flight.o scenic.o aerobatic.o
g++ skyhigh.o utility1.o flight.o scenic.o aerobatic.o -o skyhigh
skyhigh.o: skyhigh.cpp skyhigh.h flight.h aerobatic.h scenic.h
g++ -ansi -Wall -pedantic -gstabs -c skyhigh.cpp
utility1.o: utility1.cpp utility1.h
g++ -ansi -Wall -pedantic -gstabs -c utility1.cpp
flight.o: flight.cpp flight.h aerobatic.h scenic.h
g++ -ansi -Wall -pedantic -gstabs -c flight.cpp
scenic.o: scenic.cpp scenic.h
g++ -ansi -Wall -pedantic -gstabs -c scenic.cpp
aerobatic.o: aerobatic.cpp aerobatic.h
g++ -ansi -Wall -pedantic -gstabs -c aerobatic.cpp
clean:
rm -f *.o core *.report *.errs

Answer 1

It can't find the object file where those missing functions are defined. Make sure you are adding the generated object file for linking. Something like that (main is the exec name and main.o is the object with the main function, change them as needed):
g++ -o main main.o skyhigh.o utility1.o flight.o scenic.o aerobatic.o