bug#62317: bug #62317: 28.2; This byte-compiled file behaves wrongly.

[Eli Zaretskii]

> Date: Thu, 30 Mar 2023 18:20:45 +0900 (JST)
> Cc: eliz@gnu.org, akrl@sdf.org
> From: Teika Kazura <teika@gmx.com>
> 
> What surprises is that `native-compile-async' and `batch-native-compile' 
> generate differnt codes. To show it, use the same init.el and a.el above. 
> Byte-compile first a.el, then init.el. Next native-compile init.el. Run 
> emacs, and the above bug appears.

This is not surprising at all: native-compile-async compiles in a
separate process with environment unaffected by your customizations,
whereas batch-native-compile compiles in the current session, and thus
inherits all of your customizations.

> The difference is that (i) if you use native-compile-async, by removing one 
> of init-<hash>.eln or init.elc, the bug disappears, even if the other 
> remains. But (ii) if you use "$ emacs -Q -batch -f batch-native-compile *el", 
> eln in fact does not matter; only the presence of init.elc screws things up.
> 
> # Who can expect this?
> 
> At the very least, native-compilation has too many undocumented aspects. If 
> you want, I'll open a new bug for this discrepancy.
> 
> # It's off-topic for this bug, but for the above sample code, automatic, 
> asynchronous generation of an eln file does not happen, unlike the case of my 
> real init.el. I can't find the reason yet.

If the above happens in "emacs -Q", a reproducible recipe will help.
And please try that in Emacs 29 if you can, since we don't plan on any
releases of Emacs 28 with any substantial changes.