stdc_count_ones_ui
return (stdc_count_ones_ui(ui) == 1);
.so_ui = stdc_count_ones_ui,
if (stdc_count_ones_ui(new_flags & option_flags) > 1)
extern unsigned int stdc_count_ones_ui(unsigned int) _C23_UNSEQ_ATTR;
char(*)[4]: stdc_count_ones_ui(val), \