Creating and Using Libraries

Hello!

In the Test.Lib Library I am creating a function, which set a specific port and pin. The port and pin must be defined in the project to which i have added Test.Lib

In Library Project, I have Test.C

Test.C
=======
extern char Port;
extern bit pin;
void func(unsigned char ch, bit bt)
{ Port = ch; pin = bt;
}

the Test.Lib is successfully compiled and generated the .Lib file.
Now I added this .Lib file to my working project. The main file look like this.

main.c
======

#define Port P1
sbit pin = P0^0;

void func(unsigned char ch, bit bt); //Prototype

void main(void)
{ func(0x55,1); while(1);
}

It doest not set the desired values to Port and Pin.
Please help me in this regard.

Thanks.
with regards. SAJJAD