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-UNITY_BUILD_BATCH_SIZE
-----------------------
-
-Specifies the maximum number of source files that can be combined into any one
-unity source file when unity builds are enabled by the :prop_tgt:`UNITY_BUILD`
-target property. The original source files will be distributed across as many
-unity source files as necessary to honor this limit.
-
-The initial value for this property is taken from the
-:variable:`CMAKE_UNITY_BUILD_BATCH_SIZE` variable when the target is created.
-If that variable has not been set, the initial value will be 8.
-
-The batch size needs to be selected carefully. If set too high, the size of
-the combined source files could result in the compiler using excessive memory
-or hitting other similar limits. In extreme cases, this can even result in
-build failure. On the other hand, if the batch size is too low, there will be
-little gain in build performance.
-
-Although strongly discouraged, the batch size may be set to a value of 0 to
-combine all the sources for the target into a single unity file, regardless of
-how many sources are involved. This runs the risk of creating an excessively
-large unity source file and negatively impacting the build performance, so
-a value of 0 is not generally recommended.