Blog

The OCaml Planet RSS

Articles and videos contributed by both experts, companies and passionate developers from the OCaml community. From in-depth technical articles, project highlights, community news, or insights into Open Source projects, the OCaml Planet RSS feed aggregator has something for everyone.

Want your Blog Posts or Videos to Show Here?

To contribute a blog post, or add your RSS feed, check out the Contributing Guide on GitHub.

Keeping your branch up-to-date

My Arm32 branch will quickly go stale and will need to be rebased and tested. Can GitHub Actions do that for me automatically?

01 Dec 2025

Marc Elvers

Read Article
Fireworks and things

Thanks to some targetted optimisations in the script which manages Relocatable OCaml’s various branches, I’d vastly improved the turn-around time when making changes to the patch-set and propagating them through the various tests and backports. On Tuesday night, the entire set of branches was green in CI (they’re sat here with green check marks and everything). All that was to be needed on Wednesday was to quickly update the opam packaging to take advantage of Relocatable-awesomeness and plumb it all together. The 2022 version of the packages for Ljubljana I knew contained a hack for searching a previous switch, but I’d already investigated a more principled approach using opam’s build-id variable, so it would just be a matter of plumbing that in and using the cloning mechanism already in that script.

17 Jul 2025

David Allsopp's Blog

Read Article
Opam Health Check with OxCaml

Arthur mentioned that it would be great to know which packages build successfully with OxCaml and which don’t.

14 May 2025

Marc Elvers

Read Article
Irmin Database

After Thomas’ talk today I wanted to try Irmin for myself.

17 Mar 2025

Marc Elvers

Read Article
25 years of OCaml!

On this day in 1996, Xavier Leroy announced Objective Caml 1.00 (the language wasn’t officially called OCaml until 4.00.0 in July 2012). I wouldn’t start using OCaml for another 7 years; I think I may have dropped Research Machines Basic by then and was mucking around with a mix of Visual Basic, Turbo Pascal and Delphi, but I hadn’t yet got an email address either.

09 May 2021

David Allsopp's Blog

Read Article
opam 2.0.4 release

We are pleased to announce the release of opam 2.0.4. This new version contains some backported fixes: Sandboxing on macOS: considering the possibility that TMPDIR is unset [#3597 @herbelin - fix #3576] display: Fix opam config var display, aligned on opam config list [#3723 @rjbou - rel. #3717] pin...

10 Apr 2019

OCamlPro

Read Article
new opam features: "opam build"

UPDATE: after discussions following this post, this feature was abandoned with the interface presented below. See this post for the details and the new interface! The new opam 2.0 release, currently in beta, introduces several new features. This post gets into some detail on the new opam build comma...

16 Mar 2017

OCamlPro

Read Article