Interaction of cl-lib and cl function checks

[lassik]

Given a file foo.el:

;;; foo.el --- Foo
;; Package-Version: 0.1.0
;; Homepage: https://example.com/
;; Package-Requires: ((emacs "24.3") (cl-lib "0.5"))
;;; Commentary:
;; foo
(defun foo (x) (cl-parse-integer x))
(provide 'foo)
;;; foo.el ends here

M-x package-lint-current-buffer says:

warning: An explicit dependency on cl-lib <= 1.0 is not needed on Emacs >= 24.3.

But changing the Package-Requires line to:

;; Package-Requires: ((emacs "24.3"))

gives:

error: You should depend on (emacs "25.1") or the cl-lib package if you need `cl-parse-integer'.

If it's possible to use this cl function with the old Emacs 24.3 by specifying a version of the cl-lib package, should package-lint take that into account?

[purcell]

I don't think there's any version of cl-lib on ELPA that can be automatically installed in Emacs 24.3 by specifying it as a dependency, since Emacs 24.3 already believes it has version 1.0 of that library installed. Presumably that function was only added to the bundled cl-lib in Emacs 25.1.