Re: undefined symbols error, cannot figure out why

From:
Venu Yanamandra <yanamandra.venu@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Tue, 23 Nov 2010 20:30:30 -0800 (PST)
Message-ID:
<72a1a80b-259d-4e09-b964-c9b1671f902d@b25g2000vbz.googlegroups.com>
On Nov 24, 2:54 am, Jason S <jasonsav...@me.com> wrote:

A program I'm writing won't compile because it says the symbols are
undefined. I defined the symbols, but it still seems to not work.

g++ on Mac OS X outputs the following when I try and compile:

Undefined symbols:
  "server::run()", referenced from:
      _main in ccsfY9ID.o
  "Queue::~Queue()", referenced from:
      server::~server()in ccsfY9ID.o
  "server::server()", referenced from:
      _main in ccsfY9ID.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

Here's the .h file for server:

#include <iostream>
#include <ctime>

#ifndef SERVER
#define SERVER

#include "Client.h"
#include "LQueue.h"
#include "JSTimer.h"

const int NUM_CATEGORIES = 5;

class server
{
public:
        server();

        void run();

        void display(ostream & out);

        void service(int & busyTimeRemaining);
        void checkForNewClient();
private:

        int myLengthOfSimulation;
        double myArrivalRate;
        int myServicePercent[NUM_CATEGORIES];

        int myClientsReceived;
        double myTotalWaitingTime;

        JSTimer myTimer;

        Queue myIncomingClients;

};

#endif

I won't even bother including the matching .cpp file because they
clearly match the declaration. If more code is needed to figure this
out, let me know. But this baffles me.

--
Jason


Hi Jason,

First of all, you have this class server declared in the .h file and
the .cpp file making use of this .h file.

I also see that your "ccsfY9ID.cpp" must be containing your main
symbol.

If you have written the definition of functions in class server { } in
ccsfY9ID.cpp, it should be fine.

Else, if you have created another file: server.cpp and declared all
your functions there, then you must use the below instructions:

compile server.cpp using this:
g++ -c server.cpp # This would generate server.o
g++ -o final_binary ccsfY9ID.cpp server.o # Linked here. This would
generate your final binary.

Let me know if it helps.

Regards,
Venu Yanamandra

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