From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Authentication-Results: plum.tunbury.org; dkim=pass (1024-bit key; unprotected) header.d=inria.fr header.i=@inria.fr header.a=rsa-sha256 header.s=dc header.b=ZqrnPn2l; dkim-atps=neutral Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=192.134.164.83; helo=mail2-relais-roc.national.inria.fr; envelope-from=caml-list-owner@inria.fr; receiver=tunbury.org Received: from mail2-relais-roc.national.inria.fr (mail2-relais-roc.national.inria.fr [192.134.164.83]) by plum.tunbury.org (Postfix) with ESMTP id 077AF4009D for ; Tue, 17 Mar 2026 14:39:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=inria.fr; s=dc; h=from:to:date:message-id:mime-version:subject:reply-to: sender:list-id:list-help:list-subscribe:list-unsubscribe: list-post:list-owner:list-archive; bh=3i4dP1OmJSKvFznQGmyPiqLzPhzNTfBdYq81pSWPt+4=; b=ZqrnPn2lTXJsB4CDOONx/QTRa2pKOv3mp/SWzNIptfW7xPyfKUd6BYch 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ip4:128.93.162.3 ip4:128.93.162.88 ip4:89.107.174.7 mx ~all" Received-SPF: None (mail2-relais-roc.national.inria.fr: no sender authenticity information available from domain of postmaster@prod-sympa-app.inria.fr) identity=helo; client-ip=128.93.162.27; receiver=mail2-relais-roc.national.inria.fr; envelope-from="caml-list-owner@inria.fr"; x-sender="postmaster@prod-sympa-app.inria.fr"; x-conformance=spf_only X-IronPort-AV: E=Sophos;i="6.23,126,1770591600"; d="scan'208,217";a="268201401" Received: from prod-sympa-app.inria.fr ([128.93.162.27]) by mail2-relais-roc.national.inria.fr with ESMTP; 17 Mar 2026 15:39:14 +0100 Received: by prod-sympa-app.inria.fr (Postfix, from userid 990) id 6423483763; Tue, 17 Mar 2026 15:39:13 +0100 (CET) Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by prod-sympa-app.inria.fr (Postfix) with ESMTP id 61781823E5 for ; Tue, 17 Mar 2026 15:39:06 +0100 (CET) X-CSE-ConnectionGUID: aLMfCwOpQBmPTSso8f/Daw== X-CSE-MsgGUID: cldyxlnySQygGBLLjhnqvg== X-IronPort-AV: E=Sophos;i="6.23,126,1770591600"; d="scan'208,217";a="141577572" Received: from mac-03220211.irisa.fr ([131.254.21.249]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Mar 2026 15:39:06 +0100 From: Alan Schmitt To: "lwn" , caml-list@inria.fr Date: Tue, 17 Mar 2026 15:39:05 +0100 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="=-=-=" Subject: [Caml-list] Attn: Development Editor, Latest OCaml Weekly News Reply-To: Alan Schmitt X-Loop: caml-list@inria.fr X-Sequence: 19472 Errors-To: caml-list-owner@inria.fr Precedence: list Precedence: bulk Sender: caml-list-request@inria.fr X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: Archived-At: --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: base64 SGVsbG8NCg0KSGVyZSBpcyB0aGUgbGF0ZXN0IE9DYW1sIFdlZWtseSBOZXdzLCBmb3IgdGhlIHdl 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dGVwb21tZS5uZXQvPg0KDQo= --=-=-= Content-Type: text/html; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable OCaml Weekly News

OCaml Weekly News

Previous Week<= /a> Up Next Week

Hello

Here is the latest OCaml Weekly News, for the week of March 10 to 17, 2026.

Public securiy meeting

Archive: https://discuss.ocaml.org/t/public-securiy-meeting/17882/1

Hannes Mehnert announced

Dear everyone,

as a reminder =E2=80=93 next week Thursday (March 19th) 14:00 CEST, there w= ill be a public OCaml security meeting hosted by the https://ocaml.org/security team. We will meet at https://meet.bo= rnhack.dk/OCamlSecurityPublicMeeting

Our agenda and notes will be at https://pad.data.coop/Ie5voBePSiKvjZdEko6otQ#

If you're curious, the notes from our last meeting are at https://pad.data.coop/7-Ic5rG6Toyns= W02hJsndg

Hope to see you there!

Google OR-Tools: CP-SAT Subset

Archive: https://discuss.ocaml.org/t/google-or-tools-cp-sat-subset/17885= /1

Timothy Bourke announced

The Google OR-Tools<= /a> are a suite of tools for solving optimization problems. They include, i= n particular, CP-SAT, which is a powerful constraint solver and optimizer for integer linear = programming and boolean satisfiability problems.

The ocaml-ortools pa= ckage provides an OCaml interface to a subset of CP-SAT constraints. It com= prises two parts `ortools`, which allows modelling constraint problems in O= Caml and translating them to a protocol buffer format (thanks to ocaml-protc), and `ortools_so= lvers`, which allows an embedded version of CP-SAT to be called directly fr= om OCaml. Both parts can be installed using opam or built with dune. The la= tter includes the source of OR-Tools 9.15 which is built together with most= of its libraries and installed as part of the opam package.

Some simple examples can be found in the online documentation and source code= . They can be built using the following commands. 

opam install ortools ortools_solvers
ocamlfind ocamlopt -o prog -package ortools -package ortools_solvers -linkp=
kg prog.ml

I would be happy to accept pull requests for the missing CP-SAT constraints= (I think it best to develop the interface together with real applications,= and I only need the ILP and boolean parts at the moment), to translate mor= e of the standard example programs (an easy way to contribute), and to incl= ude other solvers from the suite (likely to involve solving tedious compila= tion and compatibility problems across multiple platforms).

Thanks to @nojb, @Rucikir , and others for their help<= /a> with dun= e, and @xvw and @panglesd for their help with odoc. Thanks to @jmid , @mseri , and @avsm for= discussing and merging my opam-repository pull requests.

Neocaml-mode (A modern Emacs major mode for OCaml) is looking = for testers

Archive: https://discuss.ocam= l.org/t/neocaml-mode-a-modern-emacs-major-mode-for-ocaml-is-looking-for-tes= ters/17807/23

Continuing this thread, Bozhidar Batsov announced

FYI - ht= tps://github.com/bbatsov/neocaml/releases/tag/v0.4.0

You'll need to update your Tree-sitter grammars due to some upstream (break= ing) changes in the TS OCaml grammar.

oui: multi-platform binary installers

Archive: https://discuss.ocaml.org/t/ann-oui-multi-platform-b= inary-installers/17886/1

Nathan Rebours announced

We are happy to announce the first release of oui!

oui is a tool that generates multi-platform binary installers = for your OCaml applications. It can generate installers for Windows, Linux = and MacOS. We hope it will help all of you out there developping applications for non = OCaml developers, allowing your users to install your programs without havi= ng to install OCaml and/or opam, thus greatly simplifying their user experi= ence.

You can install oui with the following command: 

opam install oui

We made it as generic as possible to ensure it works for everyone. You invo= ke it as follows: 

oui build oui.json install-bundle

where install-bundle is a folder containing your precompiled b= inaries and any files you want to install alongside them, arranged in any w= ay you'd like. The oui.json file is a configuration file that contains metada= ta and information on the installation bundle's layout such as where to fin= d binaries to add to the PATH or where to find manpages.

oui can also create installers for plugins, assuming the main = application was either installed by a oui generated installer,= or was installed following some basic rules.

The project is hosted on github: https://github.com/OCamlPro/ocaml-universal-install= er The full documentation is available here. In particula= r, you can find guidelines on how to use it to create installers for your d= une built project here.

Please go ahead and give it a try, we'd love to hear your feedback.

We welcome external contributors so if you'd like to take part in the proje= ct, please read our CONTRIBUTING.md and jump in!

The project is still in a relatively early stage and there are some key fea= tures we'd like to add, such as streamlining the user experience for dune p= rojects (removing the necessity to maintain a separate configuration file f= or the most common use cases) or support for cross-compilation/cross-platfo= rm installer generation. If those features sound interesting to you and you= would like to fund their development, please reach out to contact@ocamlpro= .com .

Finally, we'd like to thank our partner CEA-list who funded the initial dev= elopment of oui from opam-wix and made it all pos= sible!

Happy installing!

Nixtamal: Fulfilling Input Pinning for Nix

Archive: https://discuss.ocaml.org/t/ann-nixtamal-fulfil= ling-input-pinning-for-nix/17887/1

toastal announced

Nixtamal is my first serious OCam= l project release, now at verison 1.1.4. It was created as a reaction to th= e lack of features I wanted from its =E2=80=9Ccompetitors=E2=80=9D ni= v & npins while additionally covering features Nix = flakes never could support given it=E2=80=99s rigid design philosophy which= has more drawbacks than folks initially realize. I have been using it on a= ll projects for a couple months now & had at least a couple folks I did= n=E2=80=99t know prior try it out providing feedback & bug reports.

Key features:

  • Automate the manual work of input pinning for dependency management
  • Allow easy ways to lock & refresh those inputs
  • Declarative KDL manifest file over impe= rative <abbr title=3D"command line interface">CLI</abbr> flags<= /li>
  • Host, forge, <abbr title=3D"version control system">VCS</abbr&= gt;-agnostic
  • Choose <abbr title=3D"evaluation">eval</abbr> time fetchers= (builtins) or build time fetchers (Nixpkgs, default) =E2=80=94 which opens= up fetching now-supported Darcs, Pijul, & = Fossil
  • Supports mirrors (on kinds that support mirrors)
  • Override hash algorithm on a per-project & per-input basis =E2=80= =94 including BLAKE3 support (which does r= equire enabling `blake3-hashes` to opt in)
  • Custom freshness commands (avoid refetching massive inputs just to chec= k the hash hasn=E2=80=99t changed)
  • No experimental Nix features required (flakes)

Outside the homepage, it would be worth checking the <abbr title=3D"frequently asked questions">FAQs= </abbr> if any whats or whys come up.

OCaml-RDF 1.2.0

Archive: https://discuss.ocaml.org/t/ann-ocaml-rdf-1-2-0/17890/1

Zoggy announced

Hello,

A new release of OCaml-RDF, 1.2.0, is available. The main additions are:

  • a new Igraph module, providing immutable graphs (for function= al style).
  • a new rdf_rdfa package implementing a Rdfa 1.1 processor.

It is available from my own opam repository.

Slipshow!

Archive: http= s://discuss.ocaml.org/t/ann-slipshow/16337/22

Continuing this thread, Paul-Elliot announced

It is with a blatant denial of the current situation that I announce the ne= xt release of Slipshow:

Slipshow 0.10.0: Don't look {up}

The asteroid star of the release is the new warnings that the co= mpiler can raise to help you write a bug-free presentation. Those warnings = are visible on the command-line, but also in the hot-reloading preview in <= code>serve mode!

https://github.com/user-attachments/assets/f78568e5-dbbf-4= 9e3-9cd3-8d2e5c4edfda

Warnings will hopefully help detect bugs in your presentations and improve = the experience, especially of newcomers!

This time, I'd like to thanks @Alistair for the incredible Grace =F0=9F=92=85 library. Whenever I loo= k somewhere, I find a new OCaml pearl. Thank you for that! This library, th= e ecosystem, open-source, are all awesome things.

And thanks again to NLNet for supporting the development of Slipshow!

Here is the full changelog:

Added

  • Helpful warnings at compile-time (#213):
    • Action parsing failures,
    • Missing ID (and external-ids frontmatter field to selectiv= ely deactivate),
    • Duplicated ID,
    • Frontmatter parsing error,
    • Wrong target type for actions,
    • Missing file,
    • Unknown attribute,
    • …

Fixed

  • Fixed drawing stopping slightly after pauses (#216)
  • Fixed keyboard shortcuts not working in serve mode until the preview was clicked (#215)
  • Fix shortcuts not working after saving a drawing (#217)
  • Fix wrong example links in docs (#218)

Is there a public archive for the caml-list?

Archive: https://discuss.ocaml.org/t/is-there-a-public-arc= hive-for-the-caml-list/16374/6

Continuing this thread, Calascibetta Romain announced=

Hello, I am pleased to announce the launch of https://caml-list.robur.coop/, a unikernel that provides a= search engine for the caml-list. We now have public access to this archive= :tada:!

Our cooperative is currently working on several fronts, including email, by= offering an archiving system. For more details, please see this articl= e. Another article describes the search engine we use, and a thir= d explains how we developed this unikernel (although the latter has= evolved considerably since then, the core remains the same).

We are therefore delighted to make this service available to the community,= and if you would like to help us improve it, the project is currently avai= lable here. We would li= ke to thank NLnet for funding this uniker= nel, and if you appreciate our work, please do not hesitate to make a donat= ion to our cooperative (via GitHub or directly to our coo= perative)

Finally, this example also showcases all our work on unikernels: from what = an Ethernet frame is, through the archive system and the extraction of emai= ls from a virtualised hard drive, right up to the HTTP request - everyth= ing is done in OCaml (and we would once again recommend reading our tut= orial on mnet if you wou= ld like to build up unikernels).

So have fun hunting for relics from the history of OCaml!

Old CWN

If you happen to miss a CWN, you can send me a message and I'll mail it to you, or go take a loo= k at the archive or the <= a href=3D"https://alan.petitepomme.net/cwn/cwn.rss">RSS feed of the archive= s.

If you also wish to receive it every week by mail, you may subscribe to the= caml-list.

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