[ANN] Dune 2.9.0

[ejgallego]

Dear all, on behalf of the Dune team I’m pleased to announce the release of Dune 2.9.0. This is the last release on the Dune 2.x series and could be considered a maintenance release as it mostly consists on bug fixes and miscellaneous tweaks and features for sites,
instrumentation, and mdx support.

Please find the full list of changes below:

• Add (enabled_if ...) to (mdx ...) (https://github.com/ocaml/dune/pull/4434, @emillon)

• Add support for instrumentation dependencies (https://github.com/ocaml/dune/pull/4210, fixes https://github.com/ocaml/dune/issues/3983, @nojb)

• Add the possibility to use locks with the cram tests stanza (https://github.com/ocaml/dune/pull/4480, @voodoos)

• Allow to set up merlin in a variant of the default context
  (https://github.com/ocaml/dune/pull/4145, @TheLortex, @voodoos)

• Add (package ...) to (mdx ...) (https://github.com/ocaml/dune/pull/4691, fixes https://github.com/ocaml/dune/issues/3756, @emillon)

• Handle renaming of coq.kernel library to coq-core.kernel in Coq 8.14 (https://github.com/ocaml/dune/pull/4713, @proux01)

• Fix generation of merlin configuration when using (include_subdirs unqualified) on Windows (https://github.com/ocaml/dune/pull/4745, @nojb)

• Fix bug for the install of Coq native files when using (include_subdirs qualified)
  (https://github.com/ocaml/dune/pull/4753, @ejgallego)

• Allow users to specify install target directories for doc and
  etc sections. We add new options --docdir and --etcdir to both
  Dune’s configure and dune install command. (https://github.com/ocaml/dune/pull/4744, fixes https://github.com/ocaml/dune/issues/4723,
  @ejgallego, thanks to @JasonGross for reporting this issue)

• Fix issue where Dune would ignore (env ... (coq (flags ...)))
  declarations appearing in dune files (https://github.com/ocaml/dune/pull/4749, fixes https://github.com/ocaml/dune/issues/4566, @ejgallego @rgrinberg)

• Disable some warnings on Coq 8.14 and (lang coq (>= 0.3)) due to
  the rework of the Coq “native” compilation system (https://github.com/ocaml/dune/pull/4760, @ejgallego)

• Fix a bug where instrumentation flags would be added even if the
  instrumentatation was disabled (@nojb, https://github.com/ocaml/dune/pull/4770)

• Fix https://github.com/ocaml/dune/issues/4682: option -p takes now precedence on environement variable
  DUNE_PROFILE (https://github.com/ocaml/dune/pull/4730, https://github.com/ocaml/dune/pull/4774, @bobot, reported by @dra27 https://github.com/ocaml/dune/issues/4632)

• Fix installation with opam of package with dune sites. The .install file is
  now produced by a local dune install during the build phase (https://github.com/ocaml/dune/pull/4730, https://github.com/ocaml/dune/pull/4645,
  @bobot, reported by @kit-ty-kate https://github.com/ocaml/dune/issues/4198)

• Fix multiple issues in the sites feature (https://github.com/ocaml/dune/pull/4730, https://github.com/ocaml/dune/pull/4645 @bobot, reported by @Lelio-Brun
  https://github.com/ocaml/dune/issues/4219, by @Kakadu https://github.com/ocaml/dune/issues/4325, by @toots https://github.com/ocaml/dune/issues/4415)

[ejgallego]

note: This version has a serious bug where it will generate non-usable opam files if (lang dune 2.9) is used, please update to 2.9.1 if possible.