CMAKE_AUTOGEN_PARALLEL
Number of parallel moc or uic processes to start when using AUTOMOC and AUTOUIC.
This variable is used to initialize the AUTOGEN_PARALLEL property on all the targets. See that target property for additional information.
By default CMAKE_AUTOGEN_PARALLEL is unset.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.15/variable/CMAKE_AUTOGEN_PARALLEL.html