将插入函数用于char *类型时出现“链接器错误”

Question

将插入函数用于myList时，编译存在问题，将代码更改为其他类型（例如int）时，代码可以正常工作。插入函数是单独编译的，并与makefile链接。我刚刚包括了我遇到问题的代码部分，其余部分都很好。

错误： g ++ -o proj6Base proj6Base.o island.o

proj6Base.o：在函数ArchipelagoExpedition::insertfilename(char*)': proj6Base.cpp:(.text._ZN21ArchipelagoExpedition14insertfilenameEPc[_ZN21ArchipelagoExpedition14insertfilenameEPc]+0x2 2): undefined reference to myList :: insert（char *）'中 collect2：错误：ld返回1退出状态 make：*** [proj6Base]错误1

proj6base.cpp-

#include "island.h"

class ArchipelagoExpedition
{
 private:
   // Create the Data Members for the Archipelago Network here
    island* Exp[];
    myList<char*>* filenames;

 public:

 // Use a constructor to initialize the Data Members for your expedition
 ArchipelagoExpedition()
 {
    island* Exp = new island[10];
    myList<char*>* filenames;

 }

void insertfilename(char* fname){
    filenames->insert(fname);
}
}

island.cpp

    #include "island.h"

    template<typename T>
    myList<T>::myList(){
        Head = NULL;

    }

    template<typename T>
    myList<T>::myList(T v1){

        Head = new myNode<T>;
        Head->setName(v1);
    }

    template<typename T>
    void myList<T>::show(){

        myNode<T> *temp = Head;

        while (temp!=NULL){
            printf("%d "),temp->getName();
            temp->setNext(temp->getNext());
        }

    }

    template<typename T>
    void myList<T>::insert (T v1){
        if (Head == NULL){
            Head = new myNode<T>;
            Head->setName(v1);
            return;
        }

        myNode<T> *temp = Head;

        while (temp->getNext() != NULL){
            temp = temp->getNext();
        }
        myNode<T> *newroute = new myNode<T>;
        newroute->setName(v1);
        temp->setNext(newroute);
    }
}

island.h

#include <cstdio>
#include <cstring>
#include <cstdlib>

template<typename T>
class myList
{
  // data members 
 private:
    // the X and Y coordinates for the point
  myNode<T>* Head;


  public:

   // use of class constructors to initialize the variables
    myList();
    myList(T v1);

    void show();
    void insert (T v1);
}

makefile

proj6Base: proj6Base.o island.o
    g++ -o proj6Base proj6Base.o island.o

proj6Base.o: proj6Base.cpp island.h
    g++ -c proj6Base.cpp

island.o: island.cpp island.h
    g++ -c island.cpp

clean:
    rm proj6Base.o island.o proj6Base

run:
    ./proj6Base