How to define static member functions of class templates correctly.

a.cpp

#include "a.h"

int main(void)
{
    A<int> aInt;
    A<float> aFloat;

    A<int>::print();
    A<float>::print();

    return 0;
}

a.h

#include "a.h"

int main(void)
{
    A<int> aInt;
    A<float> aFloat;

    A<int>::print();
    A<float>::print();

    return 0;
}
rrmbp:cpp ryan$ cat b.cpp
#include "a.h"
rrmbp:cpp ryan$ cat a.h
#ifndef __A_H__
#define __A_H__

#include <iostream>

template <class T>
class A
{
private:
    static T counter;

public:
    static void print();
};

#endif // __A_H__

b.cpp

#include "a.h"

int b_fun() {
	A<int>::print();
}

def.cpp

#include "a.h"
template<>
void A<int>::print() {}
template<>
void A<float>::print() {}

Makefile

a.out: a.o b.o def.o

%.o: %.cpp
	clang++ -c -o $@ $<