On qmake (QtCreator) is there a way to set specific compiler options for specific source files?

I use some typeinfo/dynamic_cast in specific locations but I'd prefer to not have all the classes names around in the Release final executable. I thought that compiling with rtti only those modules would suffit. Otherwise the final exe would be fully documented with all the class names and I don't want to (or is there some other feature or strategy to deal with this?)

Thanks!