[ANN] Dune 3.18

On the behalf of the dune team, I’m glad to announce the release of dune 3.18.0

This release contains changes to support the new x-maintenance-intent field by default. It also contains some changes regarding the cache, about how it handles file permissions. It introduces a new (format-dune-file ...) stanza with the intention to formalize the dune format-dune-file command as an inside rule. Finally, it includes various bug fixes for Dune.

If you encounter a problem with this release, you can report it on the ocaml/dune repository.

Changelog

Fixed

• Support HaikuOS: don’t call execve since it’s not allowed if other pthreads
  have been created. The fact that Haiku can’t call execve from other threads
  than the principal thread of a process (a team in haiku jargon), is a
  discrepancy to POSIX and hence there is a bug about
  it. (@Sylvain78, #10953)

• Fix flag ordering in generated Merlin configurations (#11503, @voodoos, fixes
  ocaml/merlin#1900, reported by @vouillon)

Added

• Add (format-dune-file <src> <dst>) action. It provides an alternative to the
  dune format-dune-file command. (#11166, @nojb)

• Allow the --prefix flag when configuring dune with ocaml configure.ml.
  This allows to set the prefix just like $ dune install --prefix. (#11172,
  @rgrinberg)

• Allow arguments starting with + in preprocessing definitions (starting with
  (lang dune 3.18)). (@amonteiro, #11234)

• Support for opam (maintenance_intent ...) in dune-project (#11274, @art-w)

• Validate opam maintenance_intent (#11308, @art-w)

• Support not in package dependencies constraints (#11404, @art-w, reported
  by @hannesm)

Changed

• Warn when failing to discover root due to reads failing. The previous
  behavior was to abort. (@KoviRobi, #11173)

• Use shorter path for inline-tests artifacts. (@hhugo, #11307)

• Allow dash in dune init project name (#11402, @art-w, reported by @saroupille)

• On Windows, under heavy load, file delete operations can sometimes fail due to
  AV programs, etc. Guard against it by retrying the operation up to 30x with a
  1s waiting gap (#11437, fixes #11425, @MSoegtropIMC)

• Cache: we now only store the executable permission bit for files (#11541,
  fixes #11533, @ElectreAAS)

• Display negative error codes on Windows in hex which is the more customary
  way to display NTSTATUS codes (#11504, @MisterDA)

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