Clang actually doesn't warn in -Wextra: https://www.godbolt.org/z/99ejvY9Pc https://www.godbolt.org/z/99ejvY9Pc It requires the separate option -Wimplicit-fal

Clang actually doesn't warn in -Wextra: https://www.godbolt.org/z/99ejvY9Pc https://www.godbolt.org/z/99ejvY9Pc It requires the separate option -Wimplicit-fallthrough: https://www.godbolt.org/z/GP576zG9h https://www.godbolt.org/z/GP576zG9h (which tbh sounds like a bug, because usually Clang tries to emulate GCC behaviour)