bug#64526: 30.0.50; jit-compilation and multiple function definitions

[Andrea Corallo <acorallo@gnu.org>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>> Package: Emacs
>>> Version: 30.0.50
>>>
>>>
>>> Say you have a file ~/tmp/foo.el:
>>>
>>>     ;;  -*- lexical-binding: t; -*-
>>>     (defun sm-foo1 (a) (list a 1))
>>>     (defun sm-foo1 (a) (list a 2))
>>>
>>> which you byte-compile into ~/tmp/foo.elc, and then you do:
>>>
>>>     emacs -Q -l ~/tmp/foo
>>>     M-: (sm-foo1 'a) RET
>>>
>>> you'll usually get `(a 2)` (and that's what we expect).  But if you enable
>>> native compilation and erase the `eln-cache` before trying it out you
>>> may get `(a 1)` because when the `.eln` file is reloaded on top of the
>>> `.elc` definitions, `comp--late-register-subr` will skip the second
>>> definition :-(
>>
>> Hi Stefan,
>>
>> are we sure about this? Is this reproducible?
>
> Yes, the above recipe reproduces it on my machine at least.

Okay, will look at thanks.

  Andrea