font_update_drivers  901 src/font.h     extern Lisp_Object font_update_drivers (struct frame *f, Lisp_Object list);
font_update_drivers 2271 src/frame.c      font_update_drivers (f, Qnil);
font_update_drivers 4872 src/frame.c      new_value = font_update_drivers (f, NILP (new_value) ? Qt : new_value);
font_update_drivers 4877 src/frame.c          font_update_drivers (f, old_value);