undefined reference to `vtable for implementation' error - c++

Question

I wrote some c++ files and after compiling with out make file it works fine . But when using make file it pop out some errors . My codes are :
include directory files :
application.h
#ifndef APPLICATION_H
#define APPLICATION_H
#include "employee.h"
#include "employee_data.h"
#include "employee.h"
...some defintions here...
#endif
employee.h
#ifndef EMPLOYEE_H
#define EMPLOYEE_H
#include "employee_data.h"
#endif
employee_data.h
#ifndef EMPLOYEE_DATA_H
#define EMPLOYEE_DATA_H
typedef struct
{
int emp_id;
char *name,
*dept,
*book,
*time;
}employeedata;
...some codes here...
#endif
library.h
#ifndef LIBRARY_H
#define LIBRARY_H
#include "employee_data.h"
#include "application.h"
using namespace std;
class Library
{
public:
virtual int addE() = 0;
virtual int deleteE() = 0;
virtual int issue() = 0 ;
virtual int returnB() = 0;
virtual int employee() = 0;
};
class implementation : public Library
{
private:
employeedata *emp; /*structure object*/
public:
int addE();
int deleteE();
int issue();
int returnB();
int employee();
};
#endif
main.h
#ifndef MAIN_H
#define MAIN_H
#include "library.h"
class message
{
public:
void errormessage(int);
};
#endif
and my src directory conatins .cpp files . It includes
main.cpp
#include "main.h"
#include "library.h"
#include "employee_data.h"
#include "application.h"
int main()
{
message msg;
/* codes here..../*
}
library_function.cpp
#include "library.h"
#include "employee.h"
#include "main.h"
#include "application.h"
#include "employee_data.h"
int implementation :: addE()
{
}
etc..
error_function.cpp
#include "main.h"
void message :: errormessage(int errno)
{
}
employee_functions.cpp
#include "employee.h"
#include "main.h"
..some code...
display.cpp
#include "employee_data.h"
#include "application.h"
..some code..
thread.cpp
#include "employee.h"
#include "application.h"
...some code..
and my make file is :
CC=g++
FLAGS=-o
CFLAGES=-c -Wall
THREAD=-lpthread
INCLUDE=../include/
SRC=../src/
OBJ=../obj/
OUTPUT=../bin/
$(OUTPUT)vkp:$(OBJ)main.o $(OBJ)library_functions.o $(OBJ)employee_functions.o $(OBJ)display.o $(OBJ)error_function.o $(OBJ)thread.o
$(CC) $(FLAGS) vkp $(OBJ)main.o $(OBJ)library_functions.o $(OBJ)employee_functions.o $(OBJ)display.o $(OBJ)error_function.o $(OBJ)thread.o $(THREAD)
mv vkp $(OUTPUT)
$(OBJ)main.o:$(SRC)main.cpp $(INCLUDE)main.h $(INCLUDE)employee_data.h $(INCLUDE)application.h
$(CC) $(CFLAGS) $(SRC)main.cpp -I $(INCLUDE)
mv main.o $(OBJ)
$(OBJ)library_functions.o:$(SRC)library_functions.cpp $(INCLUDE)library.h $(INCLUDE)employee.h $(INCLUDE)main.h $(INCLUDE)application.h $(INCLUDE)employee_data.h
$(CC) $(CFLAGS) $(SRC)library_functions.cpp -I $(INCLUDE)
mv main.o $(OBJ)
$(OBJ)employee_functions.o:$(SRC)employee_functions.cpp $(INCLUDE)employee.h $(INCLUDE)main.h
$(CC) $(CFLAGS) $(SRC)employee_functions.cpp -I $(INCLUDE)
mv main.o $(OBJ)
$(OBJ)display.o:$(SRC)display.cpp $(INCLUDE)employee_data.h $(INCLUDE)application.h
$(CC) $(CFLAGS) $(SRC)display.cpp -I $(INCLUDE)
mv main.o $(OBJ)
$(OBJ)error_function.o :$(SRC)error_function.cpp $(INCLUDE)main.h
$(CC) $(CFLAGS) $(SRC)error_function.cpp -I $(INCLUDE)
mv main.o $(OBJ)
$(OBJ)thread.o:$(SRC)thread.cpp $(INCLUDE)employee.h $(INCLUDE)application.h
$(CC) $(CFLAGS) $(SRC)thread.cpp -I $(INCLUDE)
mv main.o $(OBJ)
After runing make i got eroor like :
g++ ../src/main.cpp -I ../include/
/tmp/cc09snhj.o: In function `main':
main.cpp:(.text+0x568): undefined reference to `message::errormessage(int)'
main.cpp:(.text+0x5fb): undefined reference to `message::errormessage(int)'
main.cpp:(.text+0x6c5): undefined reference to `message::errormessage(int)'
main.cpp:(.text+0x758): undefined reference to `message::errormessage(int)'
main.cpp:(.text+0x7f3): undefined reference to `message::errormessage(int)'
/tmp/cc09snhj.o: In function `implementation::implementation()':
main.cpp:(.text._ZN14implementationC2Ev[_ZN14implementationC5Ev]+0x1f): undefined reference to `vtable for implementation'
collect2: ld returned 1 exit status
make: *** [../obj/main.o] Error 1
what is wrong on my code ? any problem in make file ? I think the problem is linking the header files . Is this correct way to link header files ? Please help me to get my make file work .

Answer 1

I think you just misspelled CFLAGS in CFLAGES=-c -Wall
I'm guessing this is the case since
g++ ../src/main.cpp -I ../include/
does not have the -c option