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First release candidate for OCaml 5.4.0

The release of OCaml 5.4.0 is imminent.

As a final step, we are publishing a release candidate to check that everything is in order before the release in the upcoming week.

If you find any bugs, please report them on the OCaml's issue tracker.

Compared to the second beta, this release candidate only contains a fix in the TSAN mode, and one metadata fix in the changelog itself. The full change log for OCaml 5.4.0 is available on GitHub.

Happy hacking,
Florian Angeletti for the OCaml team.

Installation instructions

The base compiler can be installed as an opam switch with the following commands on opam 2.1 and later:

opam update
opam switch create 5.4.0~rc1

The source code for the release candidate is also directly available on:

Fine-tuned compiler configuration

If you want to tweak the configuration of the compiler, you can switch to the option variant with:

opam update
opam switch create <switch_name> ocaml-variants.5.4.0~rc1+options <option_list>

where <option_list> is a space-separated list of ocaml-option-* packages. For instance, for a flambda and no-flat-float-array switch:

opam switch create 5.4.0~rc1+flambda+nffa ocaml-variants.5.4.0~rc1+options ocaml-option-flambda ocaml-option-no-flat-float-array

All available options can be listed with opam search ocaml-option.