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AUTOMOC_COMPILER_PREDEFINES --------------------------- Boolean value used by :prop_tgt:`AUTOMOC` to determine if the compiler pre definitions file ``moc_predefs.h`` should be generated. CMake generates a ``moc_predefs.h`` file with compiler pre definitions from the output of the command defined in :variable:`CMAKE_CXX_COMPILER_PREDEFINES_COMMAND <CMAKE_<LANG>_COMPILER_PREDEFINES_COMMAND>` when - :prop_tgt:`AUTOMOC` is enabled, - :prop_tgt:`AUTOMOC_COMPILER_PREDEFINES` is enabled, - :variable:`CMAKE_CXX_COMPILER_PREDEFINES_COMMAND <CMAKE_<LANG>_COMPILER_PREDEFINES_COMMAND>` isn't empty and - the Qt version is greater or equal 5.8. The ``moc_predefs.h`` file, which is generated in :prop_tgt:`AUTOGEN_BUILD_DIR`, is passed to ``moc`` as the argument to the ``--include`` option. By default :prop_tgt:`AUTOMOC_COMPILER_PREDEFINES` is initialized from :variable:`CMAKE_AUTOMOC_COMPILER_PREDEFINES`, which is ON by default. See the :manual:`cmake-qt(7)` manual for more information on using CMake with Qt.