[new release] dune (1.9.0)

[rgrinberg]

CHANGES:

• Warn when generated .merlin does not reflect the preprocessing
  specification. This occurs when multiple stanzas in the same directory use
  different preprocessing specifications. This warning can now be disabled with
  allow_approx_merlin (Over approximate ppx in .merlin dune#1947, fix FLG -ppx directive missing in .merlin dune#1946, @rgrinberg)

• Watch mode: display "Success" in green and "Had errors" in red (Watch mode: display red/green status in colors dune#1956,
  @emillon)

• Fix glob dependencies on installed directories (Fix glob dependencies on external directories dune#1965, @rgrinberg)

• Add support for library variants and default implementations. (Variant selection mechanism for virtual libraries dune#1900,
  @TheLortex)

• Add experimental $ dune init command. This command is used to create or
  update project boilerplate. (Add dune init command dune#1448, fixes a wizard / quickstart a la oasis would be cool dune#159, @shonfeder)

• Experimental Coq support (fix Make output-obj test more reproducible dune#1466, @ejgallego)

• Install .cmi files of private modules in a .private directory (Install private cmi's dune#1983, fix
  Install Private Modules dune#1973 @rgrinberg)

• Fix dune subst attempting to substitute on directories. (Fix dune subst trying to substitute on directories dune#2000, fix dune subst: internal Sys_error raised dune#1997,
  @rgrinberg)

• Do not list private modules in the generated index. (List only public modules in generated index dune#2009, fix documentation target and private_modules dune#2008,
  @rgrinberg)

• Warn instead of failing if an opam file fails to parse. This opam file can
  still be used to define scope. (Warn instead of failing on opam files dune#2023, @rgrinberg)

• Do not crash if unable to read a directory when traversing to find root
  (Do not crash if unable to find root dune#2024, @rgrinberg)

• Do not exit dune if some source directories are unreadable. Instead, warn the
  user that such directories need to be ignored (Fix unreadable source dirs dune#2004, fix jbuilder shouldn't fail on unreadable directories dune#310, @rgrinberg)

• Fix nested (binaries ..) fields in the env stanza. Previously, parent
  binaries fields would be ignored, but instead they should be combined.
  (Make local_binaries respect bindings in parent dune#2029, @rgrinberg)

• Allow "." in c_names and cxx_names (Allow . in c_names and cxx_names dune#2036, fix dune does not find C files with a dot in the name dune#2033, @rgrinberg)

• Format rules: if a dune file uses OCaml syntax, do not format it.
  (If a dune file uses OCaml syntax, use ocamlformat dune#2014, fix dune build @fmt --auto-promote wipes dune files in OCaml syntax dune#2012, @emillon)

[camelus]

☀️ All lint checks passed 33ce2ce

• These packages passed lint tests: dune.1.9.0

---

☀️ Installability check (10970 → 10971)

• new installable packages (1): dune.1.9.0

[kit-ty-kate]

Thanks!