> WARNING: __always_unused or __maybe_unused is preferred over > __attribute__((__unused__)) I tried the `__maybe_unused` using gcc 12, but it didn't work. It looks like the `__maybe_unused` attribute is only available in C23 and later https://en.cppreference.com/w/c/language/attributes/maybe_unused For backward compatibility, maybe we shall keep the existing `__attribute__((__unused__))`. Regards Tan En De
