CMAKE_AUTOGEN_VERBOSE
Sets the verbosity of AUTOMOC, AUTOUIC and AUTORCC. A positive integer value or a true boolean value lets the AUTO* generators output additional processing information.
Setting CMAKE_AUTOGEN_VERBOSE has the same effect as setting the VERBOSE environment variable during generation (e.g. by calling make VERBOSE=1). The extra verbosity is limited to the AUTO* generators though.
By default CMAKE_AUTOGEN_VERBOSE is unset.
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https://cmake.org/cmake/help/v3.15/variable/CMAKE_AUTOGEN_VERBOSE.html