error Undefined symbol

Hello,

I'm using CVI2013 on Win7. 

I have a DLL project proj1.dll where I declared a function "GetExxotestList" like this : 

int __attribute__((overloadable)) GetExxotestList (int *NbCardUSB, int *NbCardPCI, struct DEVICE *Device[8])

DEVICE is a struct declared in the same .c file like this : 

struct DEVICE 
{
	unsigned long d;
....
};

In the .h file of this project, I declared only the function prototype like this :

int __attribute__((overloadable)) GetExxotestList (int *NbCardUSB, int *NbCardPCI, struct DEVICE *Device[8]);

And I compile it with no errors.

Now, in the Main project (executable) I wanted to call this function inside a callback function, so I did like this : 

int CVICALLBACK Refresh_Exxotest_Panel_CB (int panel, int control, int event,
			void *callbackData, int eventData1, int eventData2)
{
	int NbExxoCardUSB = 0;
	int NbExxoCardPCI = 0;
	struct DEVICE *Device[8];
	switch (event)
	{
		case EVENT_COMMIT:
			//Update exxotest list
			GetExxotestList (&NbExxoCardUSB, &NbExxoCardPCI, Device[8]);
			break;
	}
	return 0;
}

In the Main project, I added the .lib and .h files of the dll project. 

The problem is when I try to compile the Main, I have this link error :

error: Undefined symbol '__Z15GetExxotestListPiS_PP6DEVICE' referenced in "c:\ProjectX\Sources\Main\cvibuild.Main\Debug\Main.obj".

I can't undrestund why ! 

What is weird too, is that "Z15" and "PiS_PP6" labels are added automatically in the error message, I don't know what is it.

Please advice,

best regards, 

Houssam