Offloading of a simple code that includes a User Defined Reduction

Dear all,

I am trying to compile with the latest Intel compiler (version 16.0.3) the following simple code in which an OpenMP v4.x user defined reduction is offloaded to a MIC.

#pragma offload_attribute (push,target(mic))
#include <stdio.h>

typedef struct {
   double real;
   double imag;
} complex_t;

complex_t complex_add (complex_t a, complex_t b)
{
   complex_t c;
   c.real = a.real + b.real;
   c.imag = a.imag + b.imag;
   return c;
}

#pragma offload_attribute (pop)

int main ()
{
   complex_t x;

#pragma omp declare reduction(cmplxAdd: complex_t: omp_out=complex_add(omp_out, omp_in)) initializer( omp_priv={0.0, 0.0} )
#pragma offload target(mic) out(x)
   {
      x = (complex_t) {0.0, 0.0};

#pragma omp parallel num_threads(48) reduction(cmplxAdd: x)
      {
         x = (complex_t) {1.0, -1.0};
      }
   }

   printf ("Done: result is  %f,%f\n", x.real, x.imag);
}

The code is compiled using

icc -O3 -qopenmp -o mytest mytest.c

The compiler fails, producing the following error message:

/tmp/iccI8DGFd.o: In function `main':
main.c:(.text+0x199): undefined reference to `__udr_i_0x4633c48'
main.c:(.text+0x1d6): undefined reference to `__udr_c_0x4633658'

If I understand correctly, the first undefined reference is for the user defined reduction initializer, and the second one for the user defined reduction combiner (the reduction function). However, searching the Internet for related documentation I was not able to find anything about. What should I do to properly compile the code ? Am I missing linking one or more specific libraries ?

Thank you in advance for your kind assistance.

Italo Epicoco