Hi, the docs of the module tell us: "KDEFrameworkCompilerSettings - Set stricter compile and link flags for KDE Frameworks modules." https://api.kde.org/ecm/kde-module/KDEFrameworkCompilerSettings.html
And it has been meant that way. E.g. because extending those settings with more strict settings or new features would be done with other KF-specific requirements or policies in mind, always matching those of the current version (given KF & ECM are released in-sync). Having to take care of backward-compatibility with non-KF usage and to do proper documentation adds additional burden not wanted here. As convenient it is to not have to write out e.g. all the add_definitions( -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_URL_CAST_FROM_STRING -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_SIGNALS_SLOTS_KEYWORDS -DQT_USE_QSTRINGBUILDER -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT ) that needs some other solution. For ECM/KF5 times the train has left, we need to handle those existing abuses. But please fix your projects now already by changing back to KDECompilerSettings and the manual boilerplate, so in ECM/KF6 times that burden is gone. Cheers Friedrich