Log4cxx is disabled. No support for advanced logging. Reproducible: Always Steps to Reproduce: Install log4cxx and see CMake messages when building log prepared KDE applications. Actual Results: Log4cxx is disabled. No support for advanced logging. Expected Results: Logging is allowed to be controlled by log USE flag. Now it is in (log) state and disabled (in kde eclass?).
Please use the Gentoo-provided methods, which should give you all that you require. See the documentation of cmake-utils.eclass, in short, CMAKE_VERBOSE=1 emerge ...