CMake Warning \(dev\) at CMP0171-WARN\.cmake:[0-9]+ \(add_custom_target\):
  Policy CMP0171 is not set: 'codegen' is a reserved target name\.  Run "cmake
  --help-policy CMP0171" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning\.

  The target name "codegen" is reserved\.
Call Stack \(most recent call first\):
  CMakeLists.txt:[0-9]+ \(include\)
This warning is for project developers\.  Use -Wno-dev to suppress it\.