CMake Warning \(dev\) at CMP0046-Duplicate.cmake:5 \(add_dependencies\):
  Policy CMP0046 is not set: Error on non-existent dependency in
  add_dependencies.  Run "cmake --help-policy CMP0046" for policy details.
  Use the cmake_policy command to set the policy and suppress this warning.

  The dependency target "ctgt_no_exist" of target "dummy" does not exist.
Call Stack \(most recent call first\):
  CMP0046-Duplicate.cmake:8 \(add_dep\)
  CMakeLists.txt:3 \(include\)
This warning is for project developers.  Use -Wno-dev to suppress it.