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Pointer to shared warnings

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Hi when I compile the code below I get warnings stating that data1 and data2 are not pointers to shared data, how can I remove these warnings (the code seems to run correctly).

Here is the source code

#include <cilk/cilk.h>

	#include <offload.h>

	#include <omp.h>

	#include <stdio.h>
_Cilk_shared double * _Cilk_shared data1;

	_Cilk_shared double * _Cilk_shared data2;

	_Cilk_shared int length = 100000;
class _Cilk_shared adder{

	    public:

	        void addArrays(double * a, double * b, int length);

	};
void adder::addArrays(double * a, double * b, int length){

	    if(_Offload_get_device_number() >= 0)

	        printf("On micn");

	    else

	        printf("On hostn");

	    #pragma omp parallel for default(none) shared(a,b,length)

	    for(int i=0; i<length; i++){

	        a[i] += b[i];

	    };

	};
_Cilk_shared adder addObj;
int main(){

	    data1 = (_Cilk_shared double * _Cilk_shared) _Offload_shared_malloc(sizeof(double)*length);

	    data2 = (_Cilk_shared double * _Cilk_shared) _Offload_shared_malloc(sizeof(double)*length);

	    for(int i=0; i<length; i++){

	        data1[i] = i;

	        data2[i] = i;

	    }

	    _Cilk_offload  addObj.addArrays(data1,data2,length);

	    for(int i=0; i<length; i++){

	        if(data1[i]!=2*i){

	            printf("Something has gone wrongn");

	            return 1;

	        }

	    }

	    printf("Everything went okayn");

	    return 0;

	}
 

Here are the warnings I get when I compile

main.cpp(35): warning #2707: pointer argument in _Cilk_offload function call is not pointer-to-shared

	      _Cilk_offload  addObj.addArrays(data1,data2,length);

	                                      ^
main.cpp(35): warning #2707: pointer argument in _Cilk_offload function call is not pointer-to-shared

	      _Cilk_offload  addObj.addArrays(data1,data2,length);

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