my cmake --version is 3.5.1
running ./configure prints 4x the following, still finishes successfully:
CMake Warning (dev) in CMakeLists.txt: Policy CMP0043 is not set: Ignore COMPILE_DEFINITIONS_<Config> properties. Run "cmake --help-policy CMP0043" for policy details. Use the cmake_policy command to set the policy and suppress this warning. This warning is for project developers. Use -Wno-dev to suppress it.
From cmake --help-policy CMP0043:
CMP0043 ------- Ignore COMPILE_DEFINITIONS_<Config> properties CMake 2.8.12 and lower allowed setting the ``COMPILE_DEFINITIONS_<CONFIG>`` target property and ``COMPILE_DEFINITIONS_<CONFIG>`` directory property to apply configuration-specific compile definitions. Since CMake 2.8.10, the ``COMPILE_DEFINITIONS`` property has supported ``generator expressions`` for setting configuration-dependent content. The continued existence of the suffixed variables is redundant, and causes a maintenance burden. Population of the ``COMPILE_DEFINITIONS_DEBUG`` property may be replaced with a population of ``COMPILE_DEFINITIONS`` directly or via ``target_compile_definitions()``: # Old Interfaces: set_property(TARGET tgt APPEND PROPERTY COMPILE_DEFINITIONS_DEBUG DEBUG_MODE ) set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS_DEBUG DIR_DEBUG_MODE ) # New Interfaces: set_property(TARGET tgt APPEND PROPERTY COMPILE_DEFINITIONS $<$<CONFIG:Debug>:DEBUG_MODE> ) target_compile_definitions(tgt PRIVATE $<$<CONFIG:Debug>:DEBUG_MODE>) set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS $<$<CONFIG:Debug>:DIR_DEBUG_MODE> ) The OLD behavior for this policy is to consume the content of the suffixed ``COMPILE_DEFINITIONS_<CONFIG>`` target property when generating the compilation command. The NEW behavior for this policy is to ignore the content of the ``COMPILE_DEFINITIONS_<CONFIG>`` target property . This policy was introduced in CMake version 3.0. CMake version 3.5.1 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.