list_add_ref
list_add_ref(l, xstrdup(s));
list_add_ref(&args, abs_cc);
list_add_ref(&args, NULL);
list_add_ref(&args, abs_lint1);
list_add_ref(&args, NULL);
list_add_ref(&lint2.input_libraries, concat2("-l", lfn));
list_add_ref(&args, abs_lint2);
list_add_ref(&args, NULL);
list_add_ref(&cpp.flags,