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UNITY_BUILD_MODE
----------------
.. versionadded:: 3.18
CMake provides different algorithms for selecting which sources are grouped
together into a *bucket*. Selection is decided by this property,
which has the following acceptable values:
``BATCH``
When in this mode CMake determines which files are grouped together.
The :prop_tgt:`UNITY_BUILD_BATCH_SIZE` property controls the upper limit on
how many sources can be combined per unity source file.
Example usage:
.. code-block:: cmake
add_library(example_library
source1.cxx
source2.cxx
source3.cxx
source4.cxx)
set_target_properties(example_library PROPERTIES
UNITY_BUILD_MODE BATCH
UNITY_BUILD_BATCH_SIZE 2
)
``GROUP``
When in this mode each target explicitly specifies how to group
source files. Each source file that has the same
:prop_sf:`UNITY_GROUP` value will be grouped together. Any sources
that don't have this property will be compiled individually. The
:prop_tgt:`UNITY_BUILD_BATCH_SIZE` property is ignored when using
this mode.
Example usage:
.. code-block:: cmake
add_library(example_library
source1.cxx
source2.cxx
source3.cxx
source4.cxx)
set_target_properties(example_library PROPERTIES
UNITY_BUILD_MODE GROUP
)
set_source_files_properties(source1.cxx source2.cxx source3.cxx
PROPERTIES UNITY_GROUP "bucket1"
)
set_source_files_properties(source4.cxx
PROPERTIES UNITY_GROUP "bucket2"
)
If no explicit :prop_tgt:`UNITY_BUILD_MODE` has been specified, CMake will
default to ``BATCH``.
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