Re: The emacs-28 release branch has been created

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: kbrown@cornell.edu, emacs-devel@gnu.org
> Date: Mon, 04 Oct 2021 16:15:35 +0000
> 
> Okay I see what's the issue.  In `comp-final' we spawn a child process
> to run the final pass or not discriminating on the `byte+native-compile'
> var.  This is wrong cause this is not bound when using
> `batch-native-compile'.

Can you explain (or guess) why this caused the specific problem it did
(i.e. truncation of some temporary file, AFAIU), and why only in that
single .el file?

Also, your fix introduces a new special variable for that, so I guess
it means the problem is not specific to all batch native-compilations,
only to some?  If so, what is special in byte+native-compile and
batch-native-compile that they require not to spawn a child process?

Thanks.