CMake/Help/policy/CMP0043.rst

CMP0043
-------

.. |REMOVED_IN_CMAKE_VERSION| replace:: 4.0
.. include:: include/REMOVED_PROLOGUE.rst

Ignore COMPILE_DEFINITIONS_<Config> properties

CMake 2.8.12 and lower allowed setting the
:prop_tgt:`COMPILE_DEFINITIONS_<CONFIG>` target property and
:prop_dir:`COMPILE_DEFINITIONS_<CONFIG>` directory property to apply
configuration-specific compile definitions.

Since CMake 2.8.10, the :prop_tgt:`COMPILE_DEFINITIONS` property has supported
:manual:`generator expressions <cmake-generator-expressions(7)>` for setting
configuration-dependent content.  The continued existence of the suffixed
variables is redundant, and causes a maintenance burden.  Population of the
:prop_tgt:`COMPILE_DEFINITIONS_DEBUG <COMPILE_DEFINITIONS_<CONFIG>>` property
may be replaced with a population of :prop_tgt:`COMPILE_DEFINITIONS` directly
or via :command:`target_compile_definitions`:

.. code-block:: cmake

  # 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
:prop_tgt:`COMPILE_DEFINITIONS_<CONFIG>` target property when generating the
compilation command. The ``NEW`` behavior for this policy is to ignore the content
of the :prop_tgt:`COMPILE_DEFINITIONS_<CONFIG>` target property .

.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.0
.. |WARNED_OR_DID_NOT_WARN| replace:: warned
.. include:: include/REMOVED_EPILOGUE.rst