Warnings with CMake 3.3.1 about ament_cmake HOT 1 CLOSED

$ cmake --version
cmake version 3.3.1

CMake suite maintained and supported by Kitware (kitware.com/cmake).
Brians-MacBook-Air:ament_cmake gerkey$ cmake --help-policy CMP0026
CMP0026
-------

Disallow use of the LOCATION property for build targets.

CMake 2.8.12 and lower allowed reading the LOCATION target
property (and configuration-specific variants) to
determine the eventual location of build targets.  This relies on the
assumption that all necessary information is available at
configure-time to determine the final location and filename of the
target.  However, this property is not fully determined until later at
generate-time.  At generate time, the $<TARGET_FILE> generator
expression can be used to determine the eventual LOCATION of a target
output.

Code which reads the LOCATION target property can be ported to use the
$<TARGET_FILE> generator expression together with the file(GENERATE)
subcommand to generate a file containing the target location.

The OLD behavior for this policy is to allow reading the LOCATION
properties from build-targets.  The NEW behavior for this policy is to
not to allow reading the LOCATION properties from build-targets.

This policy was introduced in CMake version 3.0.  CMake version
3.3.1 warns when the policy is not set and uses OLD behavior.  Use
the cmake_policy command to set it to OLD or NEW explicitly.

.. note::
  The ``OLD`` behavior of a policy is
  ``deprecated by definition``
  and may be removed in a future version of CMake.