When creating a new Qt Console Project via the QtCreator Wizard (qmake) the default path in the Kit Selection step defaults to folders that create warning:

It looks like the build directory is inside of the source folder, as in this example the project folder is MutingCT_01 where all source should be in.

So normally build resides next to the project folder, but not inside.

This new location would make source code versioning (git, svn, ...) difficult as one would have to exclude changes in the build folder.