In particular, you can define the implementation flag and include the header in a .c file with no other contents to recover the more “traditional” build set up where you have a separate TU dedicated to the library.
I quite like the flexibility it provides in terms of making “unity builds” very easy, and scaling down quite well to small, single-TU projects with minimal build set ups.
Exactly! That flexibility was one of my goals. Making integration smooth for both small embedded projects and larger codebases with unity builds — glad to hear it resonates.
I first encountered the idea relatively recently with Clay [1] and I have been a fan since. Once you get past the “huh, weird” stage it has a lot of benefits!
I quite like the flexibility it provides in terms of making “unity builds” very easy, and scaling down quite well to small, single-TU projects with minimal build set ups.