C++ shared library undefined reference to `FooClass::SayHello()'

Question

I'm making a C++ Shared Library and when I compile a main exe that uses the library the compiler gives me:

main.cpp:(.text+0x21): undefined reference to `FooClass::SayHello()' collect2: ld returned 1 exit status 

Library code:

fooclass.h

#ifndef __FOOCLASS_H__ #define __FOOCLASS_H__  class FooClass  {     public:         char* SayHello(); };  #endif //__FOOCLASS_H__ 

fooclass.cpp

#include "fooclass.h"  char* FooClass::SayHello()  {     return "Hello Im a Linux Shared Library"; } 

Compiling with:

g++ -shared -fPIC fooclass.cpp -o libfoo.so 

Main: main.cpp

#include "fooclass.h" #include <iostream>  using namespace std;  int main(int argc, char const *argv[]) {     FooClass * fooClass = new FooClass();      cout<< fooClass->SayHello() << endl;      return 0; } 

Compiling with:

g++ -I. -L. -lfoo main.cpp -o main 

The machine is an Ubuntu Linux 12

Thanks!