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AUTOMOC_COMPILER_PREDEFINES
---------------------------

.. versionadded:: 3.10

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,
- ``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 ``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.

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