Re: Change in bytecomp.el breaks Gnus

[Katsumi Yamaoka <yamaoka@jpl.org>]

>>>>> In <m11xex1hhh.fsf-monnier+emacs@gnu.org> 
>>>>>	Stefan <monnier@iro.umontreal.ca> wrote:

>> (if (fboundp 'message) (defalias 'foo 'message))
>> (defun bar () (foo "Hello World"))

>> In end of data:
>> test5.el:2:1:Warning: the function `foo' is not known to be defined.

> That's normal and correct.
> If `message' is not bound, then `foo' won't be bound either, so `foo' is not
> guaranteed to be defined.

Is also the following case normal and correct?

(if (fboundp 'message)
    (defalias 'foo 'message)
  (defalias 'foo 'ignore))
(defun bar () (foo "Hello World"))

In end of data:
test6.el:4:1:Warning: the function `foo' is not known to be defined.

If it is normal, we will have to use `eval-and-compile' to
surround similar `defalias' forms in many places.