[OpenACC, f2py] Importing OpenACC code in python gives me __offload_func_table error

[Vikram Singh <vikramsingh001 at gmail dot com>]

I am trying to test how I can use fortran codes using openacc from python.

I wrote a simple test code

module test

     use iso_c_binding, only: sp => C_FLOAT, dp => C_DOUBLE, i8 => C_INT
     use omp_lib
     use openacc

     implicit none

     contains

       subroutine add_acc (a, b, n, c)
          integer(kind=i8), intent(in)  :: n
          real(kind=dp), intent(in)  :: a(n)
          real(kind=dp), intent(in)  :: b(n)
          real(kind=dp), intent(out) :: c(n)

          integer(kind=i8)  :: i

          !$acc kernels
          do i = 1, n
              c(i) = a(i) + b(i)
          end do
          !$acc end kernels

      end subroutine add_acc

      subroutine add_omp (a, b, n, c)
          integer(kind=i8), intent(in)  :: n
          real(kind=dp), intent(in)  :: a(n)
          real(kind=dp), intent(in)  :: b(n)
          real(kind=dp), intent(out) :: c(n)

          integer(kind=i8)  :: i, j

          !$omp parallel do
          do i = 1, n
              c(i) = a(i) + b(i)
          end do
          !$omp end parallel do

      end subroutine add_omp

      subroutine nt (c)
          integer(kind=i8), intent(out) :: c

          c = omp_get_max_threads()

      end subroutine nt

      subroutine mult (a, b, c)
          real(kind=dp), intent(in)  :: a
          real(kind=dp), intent(in)  :: b
          real(kind=dp), intent(out) :: c

          c = a * b

      end subroutine mult

    end module test

I have to compile the code using

f2py -c -m --f90flags='-fopenmp -fopenacc -foffload=nvptx-none -foffload=-O3
-O3 -fPIC' hello hello.f90 -L/usr/local/cuda/lib64 -lcublas -lcudart
-lgomp

It compiles fine and makes the .so file but when I try to import in
python, I get the error,

/home/Experiments/fortran_python/hello.cpython-35m-x86_64-linux-gnu.so:
undefined symbol: __offload_func_table

I tried to search where __offload_func_table is defined but I only got
crtoffloadtable.o, but no library where it is defined and I can link
to.

Any pointers?