VLC_EXPORT( int, vlc_mutex_init_recursive, ( vlc_mutex_t * ) );
VLC_EXPORT( void, vlc_mutex_destroy, ( vlc_mutex_t * ) );
VLC_EXPORT( void, vlc_mutex_lock, ( vlc_mutex_t * ) );
-VLC_EXPORT( int, vlc_mutex_trylock, ( vlc_mutex_t * ) );
+VLC_EXPORT( int, vlc_mutex_trylock, ( vlc_mutex_t * ) LIBVLC_USED );
VLC_EXPORT( void, vlc_mutex_unlock, ( vlc_mutex_t * ) );
VLC_EXPORT( int, vlc_cond_init, ( vlc_cond_t * ) );
VLC_EXPORT( void, vlc_cond_destroy, ( vlc_cond_t * ) );