Hi and welcome to the Qt Forum,
touch handling has been refactored in Qt 6, and 5.12 has been EOL for a long time.
Please upgrade to a newer Qt Version, preferably >= 6.5.
@Apoorvthedude said in How to reduce build time in QT:
it takes very much time to build
How much?
How big is the code base?
How exactly do you build (in QtCreator, in a terminal)?
Does it rebuild everything if you change one file?