If I'm using a truly compiled language (eg. C++, D), which have incremental compilation, I still have to redeploy everything since 'everything' is a single exec

If I'm using a truly compiled language (eg. C++, D), which have incremental compilation, I still have to redeploy everything since 'everything' is a single executable. If I'm using an interpreted language I only have to deploy the changed source files. Git can do that for you.