bug#70842: 30.0.50; Native compilation and gmake in src

[Eli Zaretskii]

Ping!  Andrea, if you agree with Gerd's proposal, would you please
install such a change?

> Cc: Andrea Corallo <acorallo@gnu.org>
> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Date: Thu, 09 May 2024 07:58:49 +0200
> 
> (CC'd to Andrea.)
> 
> 1. Start from a clean build with native compilation
> 
> 2. Modify a .c file in src to trigger a recompilation
> 
> 3. gmake in src
> 
> => error "trying to dump non fixed-up eln file" when dumping
> bootstrap-emacs.pdmp. Always.
> 
> I find this very inconvenient, esp. since this never happens without
> native compilation. Only thing that works currently is to make in the
> toplevel directory.
> 
> The reason for this is src/Makefile uses ELN_DESTDIR and BIN_DESTDIR in
> rules, but does not contain definitions for them. In a toplevel make,
> both are defined on the command line when invoking "gmake -C src
> ELN_DESTDIR=...".
> 
> When making in src, ELN_DESTDIR is therefore empty, and temacs is called
> with with --eln-dest empty. Loadup.el then does its thing and calls
> load--fixup-all-elns before dumping. That function decides to not set
> native compilation units' file member to a cons, and "trying to dump non
> fixed-up eln file" is then issued when dumping such a CU.
> 
> I don't know what the right fix for this is, maybe load--fixup-all-elns
> should work differently. As a workaround, it apparently suffices to add
> default values to src/Makefile like so:
> 
> ELN_DESTDIR=not-set
> BIN_DESTDIR=not-set
> 
> In GNU Emacs 30.0.50 (build 1, aarch64-apple-darwin23.4.0, NS
>  appkit-2487.50 Version 14.4.1 (Build 23E224)) of 2024-05-04 built on
>  pro2.fritz.box
> Repository revision: fdfadd6f467063dc83032b4e0dbe4e7b96690670
> Repository branch: master
> Windowing system distributor 'Apple', version 10.3.2487
> System Description:  macOS 14.4.1
> 
> Configured using:
>  'configure --cache-file
>  /var/folders/1d/k_6t25f94sl83szqbf8gpkrh0000gn/T//config.cache.master
>  --with-native-compilation CC=clang'
> 
> 
> 
>