is LoC really sound metric to use for measuring size of a project? Language like C can really blow up when you attempt to replicate object oriented programming concepts (systemd code base is verbose not bloat IMO). I don't know anything about proprietary car software but if they are one of those real-time control things that needs to be written in assembly or very low level constructs, they will also blow up in terms of LoC.
if there is a way to measure information density of a program by complexity of feature and then combine it with number of features, that will be really cool application of information theory.
well OK then I'm just counting number of instructions of binary but there could be a way to measure this in more abstract ways through flow analysis or something