Function gr_poly_gcd_wrapper 

pub unsafe extern "C" fn gr_poly_gcd_wrapper(
    gcd_impl: gr_method_poly_gcd_op,
    canonicalise_unit: c_int,
    G: *mut gr_poly_struct,
    A: *const gr_poly_struct,
    B: *const gr_poly_struct,
    ctx: *mut gr_ctx_struct,
) -> c_int