bug#48578: 28.0.50; Native-compiled files of some preloaded files not loaded at dump time

[Andrea Corallo via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

> On May 24, 2021 10:47:06 AM GMT+03:00, Andrea Corallo <akrl@sdf.org> wrote:
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> >> 
>> >> Maybe related to the fix for bug#48497 and some state of your
>> build?
>> >> 
>> >> Regards
>> >> 
>> >>   Andrea
>> >
>> > What state could that be?
>> 
>> Hard to say, mine is just a guess as I cannot reproduce it here.
>> 
>> > And what do I do to escape from that state?
>> 
>> make bootstrap or even better restart from a git clean?
>
> That would erase all the traces of the problem.  I would prefer to try to understand why it happens, there could be a subtle bug here.
>
> Suggestions for where to look for the reasons of the problem?

I'd start verifying what given the el source file
`comp-el-to-eln-rel-filename' suggests as eln filename and if this is
present as native compiled file (I guess so if you recompiled manually).

The next step would be verifying why when loading in lread.c
'maybe_swap_for_eln' does not decide to load the eln file in place of
the elc one.

  Andrea