[new release] dune (15 packages) (3.20.0~alpha0)

[maiste]

Fast, portable, and opinionated build system

• Project page: https://github.com/ocaml/dune
• Documentation: https://dune.readthedocs.io/

CHANGES:

Fixed

• Stop re-running cram tests after promotion when it's not necessary (fix(cram): do not re-run tests unnecessarily dune#11994,
  @rgrinberg)

• fix: $ dune subst should not fail when adding the version field in opam
  files (Fix #11045 dune#11801, fixes Regression in #11028 when using dune subst on a project with an opam file dune#11045, @btjorge)

• Kill all processes in the process group after the main process has
  terminated; in particular this avoids background processes in cram tests to
  stick around after the test finished (Terminate process group after cram execution dune#11841, fixes Background tasks in Cram tests are not terminated dune#11820, @Alizter,
  @Leonidas-from-XIV)

Added

• (tests) stanzas now generate aliases with the test name. To run
  (test (name a)) you can do dune build @runtest-a. (feature: tests stanzas produce aliases dune#11558, grants part of Automatically add aliases for expect tests dune#10239,
  @Alizter)

• Inline test libraries now produce aliases runtest-name_of_lib
  allowing users to run specific inline tests as dune build @runtest-name_of_lib. (feature: add aliases for inline tests dune#11109, partially fixes Automatically add aliases for expect tests dune#10239, @Alizter)

• feature: $ dune subst use version from dune-project when no version
  control repository has been detected (Fix #11045 dune#11801, @btjorge)

• Allow dune exec to run concurrently with another instance of dune in watch
  mode (Allow concurrent exec with watch mode dune#11840, @gridbugs)

• Introduce %{os}, %{os_version}, %{os_distribution}, and %{os_family}
  percent forms. These have the same values as their opam counterparts.
  (feature: share os family of vars with rules dune#11863, @rgrinberg)

• Introduce option (implicit_transitive_deps false-if-hidden-includes-supported)
  that is equivalent to (implicit_transitive_deps false) when -H is
  supported by the compiler (OCaml >= 5.2) and equivalent to
  (implicit_transitive_deps true) otherwise. (Add (implicit_transitive_deps false-if-hidden-includes-supported) dune#11866, fixes Enable (implicit_transitive_deps false) only if OCaml version supports -H? dune#11212, @nojb)

• Add dune describe location for printing the path to the executable that
  would be run (Looking up paths to executables with dune describe location dune#11905, @gridbugs)

• dune runtest can now understand absolute paths as well as run tests in
  specific build contexts (feat(runtest): support absolute paths dune#11936, @Alizter).

• Added 'empty' alias which contains no targets. (feature: empty alias dune#11556 fix: empty alias check for 3.20 dune#11952 test: empty alias in alias stanza dune#11955 doc: document empty alias dune#11956,
  grants an empty target for easier scripting dune#4161, @Alizter and @rgrinberg)

• Allow dune promote to properly run while a watch mode server is running
  ([RPC] Allow promotion while watch server is running dune#12010, @ElectreAAS)

• Add --alias and --alias-rec flags as an alternative to the @ and @@
  syntax in the command line (feature: add --alias as an argument for building aliases dune#12043, fixes Current Dune alias syntax can't work reliably on Windows dune#5775, @rgrinberg)

Changed

• Format long lists in s-expressions to fill the line instead of
  formatting them in a vertical way (Tweak dune file formatting: avoid pure vertical layout when formatting wrapped lists dune#10892, fixes auto formatting of run shouldn't split its content into one word per line dune#10860, @nojb)

• Switch from MD5 to BLAKE3 for digesting targets and rules. BLAKE3 is both more
  performant and difficult to break than MD5 (Switch to BLAKE3 dune#11735, @rgrinberg, @Alizter)

• Print a warning when dune build runs over RPC (Dune cannot build empty coq.theory dune#11836, @gridbugs)

• Stop emitting empty module group wrapper .js file in melange.emit
  (melange: don't emit module group wrapper as a JS file in melange.emit dune#11987, fixes test(melange): show melange emits the (empty) module group wrapper dune#11986, @anmonteiro)

[maiste]

Closing in favour of #28276.