Where available, my preferred solution is to compile with gcc -Wall -Werror (or equivalent); this will enable -Wswitch, causing a compile error when you fail to

Where available, my preferred solution is to compile with gcc -Wall -Werror (or equivalent); this will enable -Wswitch, causing a compile error when you fail to handle an 'enum' case. Needing to fix a few obvious compile errors after a change isn't much of a burden; un-maintainable code is code that silently breaks on changes. (The same attitude leads to lot of static_assert().) (You may also be interested in -Wswitch-enum.)