Error: L6218E - undefined symbol when calling functions from another projects in the same workspace


I'm using ARM DS-5 for my current project. In my workspace, there are two projects: test and test_bsp. My purpose is that the "test_bsp" project includes header and source files, and the application project only needs to call the functions. In the project properties, I've included the paths of all the source and header files in the "test_bsp". However, when I'm trying to build the project, I've still got an error: L2618E: Undefined symbol (my function) (referred from main.o).  Here is an example: 

In project "test": 


#include <stdio.h>

#include <test.h>

int main (void)


    printTest(); //This is where the build errors L6218E undefined symbol are

    return 0;


In project "test_bsp":


void printTest();


 void printTest()




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