Jim Meyering wrote:
Eventually, we should consider putting it [FALLTHROUGH] somewhere common and perhaps renaming it to have the GL_ prefix.
The former sounds good. The latter, I'm more dubious about, as the macro is called FALLTHROUGH in bleeding-edge Emacs source code (admittedly thanks to yours truly). I expect that in practice it would not make much sense nowadays to define the identifier FALLTHROUGH to anything else, given that C++17 has standardized the [[fallthrough]] attribute.
