[astrobe_]

Well, C and C++ together have around 7M repos, so about 10%. Actually not entirely esoteric, but Github is only a fraction of the world's codebase and users of these repos probably never looked in the makefile, so I'd say 10% of C/C++ developers knowing about this is a very optimistic estimate.

[wtallis]

Looking at GitHub is probably significantly undersampling the kinds of C projects that would be doing static linking, many of which pre-date GitHub.