[bug#54304] [PATCH] Don't fix git executable location during Elixir build

[Ludovic Courtès]

Hi,

Cees de Groot <cg@evrl.com> skribis:

> On Wednesday, March 9th, 2022 at 16:49, Tobias Geerinckx-Rice <me@tobias.gr> 
> wrote:
>> If BEAM somehow obfuscates store references we'll have to find a similar 
>> work-around to stop it. Let us know what you find.
>>
> Yup. BEAM files have literals stored in a single Deflated blob 
> (https://beam-wisdoms.clau.se/en/latest/indepth-beam-file.html). So the 
> scanning won't work.

If we know what set of store references go in those blogs, we could
create a text file or something in #$output whose sole purpose is to
keep a reference to those store items.

For example, if we know those BEAM files contain a reference to Git, we
can add a phase like:

  (lambda* (#:key inputs outputs #:allow-other-keys)
    (symlink (search-input-file inputs "git")
             (string-append (assoc-ref output "out")
                            "/libexec/elixir/.git")))

That way the GC will keep Git around.

Thoughts?

Ludo’.