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ocaml bootstrap (was Re: Core-updates merge)
From: |
Efraim Flashner |
Subject: |
ocaml bootstrap (was Re: Core-updates merge) |
Date: |
Sun, 30 Apr 2023 09:05:37 +0300 |
On Fri, Apr 28, 2023 at 04:17:40PM +0200, Simon Tournier wrote:
> Hi Andreas,
>
> On mar., 25 avril 2023 at 16:09, Andreas Enge <andreas@enge.fr> wrote:
>
> > - OCaml could be simplified by dropping version 4.07 (Julien Lepiller).
>
> Well, 4.07 is the version that is de-bootstrapped, i.e. bootstrapped
> using ’camlboot’ via Guile – for details see [2].
>
> However, higher versions (4.09, 4.14, 5) does not use this seed and thus
> they are not de-bootstrapped. Well, I do not know the status upstream;
> from my point of view, we have two options:
>
> a) Agree with other distros and OCaml folks to rely on a common OCaml
> 4.07 bootstrapped using camlboot and then use this OCaml 4.07 as the
> seed for the subsequent versions. Somehow having a way to verify the
> current OCaml compiler without running again and again via camlboot.
>
> b) Build ourselves a chain from 4.07 bootstrapped with camlboot to
> modern OCaml compilers. However, each time we modify one dependency of
> camlboot, it means rebuild the complete chain. Well, bootstrapping via
> camlboot can be very slow and I do not know if we have the resources
> for non-x86_64 architecture. Here, the list of the emerged
> dependencies:
I think similarly to the very slow *-mes part of the bootstrap chain, we
have to realize that some parts are just very slow. (A vote for b)
I built camlboot once on aarch64, probably a year ago. IIRC it took more
than 24 hours. I will say that it is doable without needing 8GB of ram,
which is also a limiting factor for the slow architectures.
> $ guix graph camlboot -t bag-emerged | grep label | cut -d'=' -f2
> "camlboot@0.0.0-1.45045d0", shape
> "guile@3.0.9", shape
> "pkg-config@0.29.2", shape
> "tar@1.34", shape
> "gzip@1.12", shape
> "bzip2@1.0.8", shape
> "file@5.44", shape
> "diffutils@3.8", shape
> "patch@2.7.6", shape
> "findutils@4.9.0", shape
> "gawk@5.2.1", shape
> "sed@4.8", shape
> "grep@3.8", shape
> "xz@5.2.8", shape
> "coreutils@9.1", shape
> "make@4.3", shape
> "bash-minimal@5.1.16", shape
> "ld-wrapper@0", shape
> "binutils@2.38", shape
> "gcc@11.3.0", shape
> "glibc@2.35", shape
> "glibc-utf8-locales@2.35", shape
> "libffi@3.4.4", shape
> "bash-minimal@5.1.16", shape
> "libunistring@1.0", shape
> "libgc@8.2.2", shape
>
> c) Fix the dependencies of camlboot.
Looking at camlboot, there's a native input of guile-3.0. Unless we want
to bootstrap using some of the boot0 packages or actually find the
minimum set of packages needed and remove the rest that are brought in
by implicit-inputs (recursively) I think it's already as small as
possible.
>
> Well, it seems a separated discussion but it echoes the recent blog post [3]
> about “The Full-Source Bootstrap”. :-)
>
> 2:
> https://10years.guix.gnu.org/video/camlboot-debootstrapping-the-ocaml-compiler
> 3:
> https://guix.gnu.org/en/blog/2023/the-full-source-bootstrap-building-from-source-all-the-way-down/
>
>
> Cheers,
> simon
>
>
>
--
Efraim Flashner <efraim@flashner.co.il> אפרים פלשנר
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- Re: Core-updates merge, (continued)
- Re: Core-updates merge, Josselin Poiret, 2023/04/25
- Re: Core-updates merge, Leo Famulari, 2023/04/25
- Build dependency inflation (was: Re: Core-updates merge), Simon Josefsson, 2023/04/27
- Re: Core-updates merge, John Kehayias, 2023/04/28
- Re: Core-updates merge, Simon Tournier, 2023/04/28
- ocaml bootstrap (was Re: Core-updates merge),
Efraim Flashner <=