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=YAZH5UH5; dkim=fail reason="signature verification failed" (1024-bit key; secure) header.d=polytechnique.org header.i=@polytechnique.org header.a=rsa-sha256 header.s=svoboda header.b=sFaqp6H2; 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]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by plum.tunbury.org (Postfix) with ESMTPS id A675E400A5 for ; Tue, 20 May 2025 11:52:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=inria.fr; s=dc; 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OCaml Weekly News

Previous Week<= /a> Up Next Week

Hello

Here is the latest OCaml Weekly News, for the week of May 13 to 20, 2025.

Send us Talk and Workshop Proposals for Fun OCaml 2025 in Wars= aw, September 15+16

Archive: https://disc= uss.ocaml.org/t/send-us-talk-and-workshop-proposals-for-fun-ocaml-2025-in-w= arsaw-september-15-16/16646/1

Sabine Schmaltz announced

Hi everyone!

Fun OCaml 2025 is a 2 days open source hacking event dedicated to OCaml ent= husiasts and professionals. We focus on the impact and potential of OCaml f= or solving real-world problems and get together in Warsaw for a conference/= hackathon over two days:

  • Day 1 (Monday, September 15): talks (which are live-streamed) and socia= lizing/hacking.
  • Day 2 (Tuesday, September 16): Workshops and hacking.

Topics we=E2=80=99re interested in:

  • how you use OCaml in your business / in your projects
  • OCaml libraries, frameworks, and other Open Source projects built on OC= aml
  • hands-on demonstrations that encourage people to try things on the seco= nd day of the event or at home
  • seeing actual code and reasoning behind design decisions
  • experience reports

For more details, check out the website and the CFP linked from there:

https://fun-ocaml.com

Volunteers to review the relocatable-OCaml work?

Archive: https://discuss.ocaml.org/t/volunteers-to-rev= iew-the-relocatable-ocaml-work/16667/1

gasche announced

Hi discuss,

David @dra27 Allsopp has been working for a few years now on making the OCa= ml compiler relocatable.

Currently you configure the compiler to be installed at a certain path, and= the resulting program and configuration depend on this path; moving the in= stalled prefix to a different place will break various things. Having a rel= ocatable compiler is good for Windows support, for reproducible builds, for= caching, etc.

An early version of this work was presented by David at the OCaml compiler = workshop 2022, and it is discuss in a past Dicuss thread.

Good news! The work is now in a good enough shape that @dra27 has started u= pstreaming parts of it – submitting them to the compiler distributio= n. There is an RFC th= at describes the design, and we got a first PR that is a test harness for the feature, with = many more to come.

Bad news: we don't know who would be available to review those PRs as they = come. @nojb made an effort to review the test harness, but is also working = on tons of other stuff (such as: trying to get stdlib contributions across = the finish line). My understanding is that @Rucikir is not available to do = this work. There is a risk that the work is held back due to the absence of= motivated reviewers to look at it.

Would anyone around be interested in helping review this work? If so, I'm h= appy to post links to further PRs as they come.

In my experience, PRs by @dra27 touch a varied number of obscure topics tha= t no one except maybe himself is an expert about – deep stuff= about how the compiler work that most of us are happy to ignore because it= usually stays out of the way. One typical example, I suspect, is #13728 : Add Sys.runti= me_executable and caml_sys_proc_self_exe (which is = not merged, not looking for reviewers). If you find this PR super-obscure, = welcome to the club, I don't understand anything either. But if you also fi= nd it interesting, you may be excellent volunteer material to review= more PRs on this.

Note: the contribution rules for compiler PRs is that each PR must be appro= ved by someone with commit rights (a compiler maintainer) to get merged. By= itself, an approval from another contributor does not suffice. But it is c= ertainly possible for maintainers to give approval on behalf of another rev= iew – we do it in practice. If you review a PR (about this or anythi= ng else) and you feel confident that it is okay to merge it, please feel fr= ee to explicitly "approve" it through the github interface.

David Allsopp added

has been working for a few years now on making the OCaml compiler relocatab= le.

Just to make it sound a little less Herculean, I haven=E2=80=99t been worki= ng solidly on it =F0=9F=98=8A There were a= few OCaml 5.0 and Windows opam 2.2-shaped diversions on the way=E2=80=A6

In addition to the already opened test harness, there=E2=80=99s a draft (wi= th explanatory text) of the first of the main PRs at https://github.com/dra27/ocaml/pull/183 a= nd a draft of the second (currently without explanatory text, although that= will be there by next week) at https://github.com/dra27/ocaml/pull/162. The third is still aw= aiting a small amount of tidying (which will hopefully also be done by the = end of next week =F0=9F=A5=B5)

Portable Lock Directories for Dune Package Management

Archive: https://discuss.ocaml.org/t/portable-lo= ck-directories-for-dune-package-management/16669/1

Steve Sherratt announced

We've recently made a change to how lock directories work in the Dune Developer Preview.

Previously when Dune would solve dependencies for a project and generate a = lock directory, the lock directory would be specialized for the computer wh= ere it was generated, with no guarantee it would work on a different comput= er. This posed a problem for checking lock directories into version control= for projects with multiple developers, since one developer might lock the = project on their Mac, say, only for another developer on Linux to be unable= to build it due to its MacOS-specific lock directory.

This post is to announce that Dune now supports generating portable = lock directories; a lock directory generated on one computer will now conta= in a dependency solution for a range of different computers, making it safe= to check lock directories into version control.

Technical Details

In Opam the dependencies of a package can be different depending on propert= ies of the computer where the package is being installed. A package might h= ave a different set of dependencies when being installed on MacOS verses Li= nux verses Windows, or the dependencies might vary depending on the CPU arc= hitecture. It's even possible (though quite rare in practice) for the depen= dencies of a package to vary between operating system distributions, or eve= n operating system versions.

This expressive power makes Opam very flexible as it allows packages to be = specialized for the environment where they will be installed. The drawback = of this approach is that there might not be a single solution to a dependen= cy problem that works everywhere. Each combination of OS/architecture/distr= o/version could, in theory, require a different dependency solution. There = are way too many combinations of those properties to run Dune's dependency = solver once for each combination in a reasonable amount of time. Instead we= elected to compromise and have Dune only generate a solution for common pl= atforms by default, while allowing users to specify a custom list of platfo= rms to solve for in their dune-workspace file.

Lockfiles now look a little different to account for the fact that they now= contain multiple different platform-specific dependency solutions. For exa= mple, formerly, the lockfile for the ocaml-compiler package on= an x86 machine running Windows, you might have had a depends = field like: 

(depends arch-x86_64 system-mingw mingw-w64-shims flexdll)

Most of these dependencies are specific to Windows; it's unlikely that you'= ll be able to install any of these dependencies on Linux or MacOS.

With the portable lock directories feature enabled, this field now might lo= ok like: 

(depends
 (choice
  ((((arch x86_64)
     (os linux))
    ((arch arm64)
     (os linux))
    ((arch x86_64)
     (os macos)
     (os-distribution homebrew)
     (os-family homebrew))
    ((arch arm64)
     (os macos)
     (os-distribution homebrew)
     (os-family homebrew)))
   ())
  ((((arch x86_64)
     (os win32)
     (os-distribution cygwin)
     (os-family windows)))
   (arch-x86_64 system-mingw mingw-w64-shims flexdll))
  ((((arch arm64)
     (os win32)
     (os-distribution cygwin)
     (os-family windows)))
   (system-mingw mingw-w64-shims flexdll))))

This new syntax is similar to a match-statement, listing the dependencies f= or each platform for which Dune's solver ran. You can change the platforms = Dune will solve for by adding something like this to dune-workspace: 

(lock_dir
 (solve_for_platforms
  ((arch arm64)
   (os openbsd))
  ((arch x86_32)
   (os win32))))

After running dune pkg lock again, the lockfile for ocam= l-compiler will be updated with these dependencies: 

(depends
 (choice
  ((((arch arm64) (os openbsd))) ())
  ((((arch x86_32)
     (os win32)))
   (system-mingw ocaml-option-bytecode-only flexdll))))

A few other fields of lockfiles now also use the new syntax. Dune lockfiles= contain the commands needed to build and install each package, as well as = the names of any system packages needed by the Opam package, and each of th= ese fields can also have platform-specific values.

Lockfile names now include the version number of the package. The oca= ml-compiler package used to have a lockfile named ocaml-compil= er.pkg but now has a name like ocaml-compiler.5.3.0.pkg= instead. This is because it's possible that different platforms may requir= e different versions of the same package in the dependency solution, so the= lock directory needs to be able to contain multiple lockfiles for the same= package without them colliding on filename.

How do I get it?

This feature is live in the latest version of the Dune Developer Preview. Follow the instructions on that = page to install a version of Dune with this feature. With portable lock dir= ectories enabled, Dune will temporarily remain backwards compatible with th= e original lock directory format, though support will likely be dropped at = some point. Generate a new lock directory by running dune pkg lock. You'll know your lock directory is portable if each file inside it ha= s a version number in its filename.

Happy reproducible building!

Other OCaml News

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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