Re: emacs reproducible builds part1 of 2 : eln

[Simon Tournier]

Hi,

On Thu, 11 Jan 2024 at 22:17, "Bernhard M. Wiedemann" <bernhardout@lsmod.de> 
wrote:

> I'm working on reproducible builds for openSUSE
> and in that process found that our emacs-29.1
> package varies across builds from 2 different issues

Similar results with GNU Guix.  Let first build a first time, then let
build a second time (--check).  And let compare the two builds:

--8<---------------cut here---------------start------------->8---
$ guix build emacs --no-grafts
$ guix build emacs --no-grafts --check -K
guix build: error: derivation 
`/gnu/store/p73n8hvadw1q8m0k47xgvj0qpqlws09s-emacs-29.1.drv' may not be 
deterministic: output `/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1' 
differs from `/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1-check'

$ diff -qr --no-dereference 
/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1 
/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1-check | wc -l
56

$ diff -qr --no-dereference 
/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1 
/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1-check | grep eln | wc -l
53

$ diff -qr --no-dereference 
/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1 
/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1-check | grep elc | wc -l
2

$ diff -qr --no-dereference 
/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1 
/gnu/store/ab5l8h98a56fb7r1r40iqjkxzv4smv1i-emacs-29.1-check | grep pdmp | wc -l
1
--8<---------------cut here---------------end--------------->8---

In addition to .eln files, two .elc files are also different:

    share/emacs/29.1/lisp/emacs-lisp/package.elc
    share/emacs/29.1/lisp/gnus/nnspool.elc

Well, any pointers for helping in removing this non-determinism would be
appreciated.


Cheers,
simon