3.0.0

CHANGES:

• Remove uchar and seq dummy ocamlfind libraries from dune's builtin
  library database (#5260, @kit-ty-kate)

• Add a DUNE_DIFF_COMMAND environment variable to match --diff-command
  command-line parameter (@raphael-proust, fix #5369, #5375)

• Add support for odoc-link rules (#5045, @lubegasimon)

• Dune will no longer generate documentation for hidden modules (#5045,
  @lubegasimon)

• Parse the native_pack_linker field of ocamlc -config (#5281, @TheLortex)

• Fix plugins with dot in the name (#5182, @bobot, review @rgrinberg)

• Don't generate the dune-site build part when not needed (#4861, @bobot,
  review @kit-ty-kate)

• Fix installation of implementations of virtual libraries (#5150, fix #3636,
  @rgrinberg)

• Run tests in all modes defined. Previously, jsoo was excluded. (@hhugo,
  #5049, fix #4951)

• Allow to configure the alias to run the jsoo tests (@hhugo, #5049, #4999)

• Set jsoo compilation flags in the env stanza (@hhugo, #5049, #1613)

• Allow to configure jsoo separate compilation in the env stanza. Previously,
  it was hard coded to always be enabled in the dev profile. (@hhugo, #5049,
  fix #970)

• Fix build-info version in jsoo executables (@hhugo, #5049, fix #4444)

• Pass -no-check-prims when building bytecode for jsoo (@hhugo, #5049, #4027)

• Fix jsoo builds when dynamically linked foreign archives are disabled
  (@hhugo, #5049)

• Disallow empty packages starting from 3.0. Empty packages may be
  re-enabled by adding the (allow_empty) to the package stanza in
  the dune-project file. (#4867, fix #2882, @kit-ty-kate, @rgrinberg)

• Add link_flags field to the executable field of inline_tests (#5088,
  fix #1530, @jvillard)

• In watch mode, use fsevents instead of fswatch on OSX (#4937, #4990, fixes
  #4896 @rgrinberg)

• Remove inotifywait watch mode backend on Linux. We now use the inotify API
  exclusively (#4941, @rgrinberg)

• Report cycles between virtual libraries and their implementation (#5050,
  fixes #2896, @rgrinberg)

• Warn when lang versions have an ignored suffix. (lang dune 2.3.4) or (lang dune 2.3suffix) were silently parsed as 2.3 and we know suggest to remove
  the prefix. (#5040, @emillon)

• Allow users to specify dynamic dependencies in rules. For example (deps %{read:foo.gen}) (#4662, fixes #4089, @jeremiedimino)

• Sandbox infer rules for menhir. Fixes possible "inconsistent assumptions"
  errors (#5015, @rgrinberg)

• Experimental support for ctypes stubs (#3905, fixes #135, @mbacarella)

• Fix interpretation of binaries defined in the env stanza. Binaries
  defined in x/dune wouldn't be visible in `x/*/**/dune. (#4975, fixes #4976,
  @Leonidas-from-XIV, @rgrinberg)

• Do not list private libraries in package listings (#4945, fixes #4799,
  @rgrinberg)

• Allow spaces in cram test paths (#4980, fixes #4162, @rgrinberg)

• Improve error handling of misbehaving cram scripts. (#4981, fix #4230,
  @rgrinberg)

• Fix foreign_stubs inside a tests stanza. Previously, dune would crash
  when this field was present (#4942, fix #4946, @rgrinberg)

• Add the enabled_if field to inline_tests within the library stanza.
  This allows us to disable executing the inline tests while still allowing for
  compilation (#4939, @rgrinberg)

• Generate a dune-project when initializing projects with dune init proj ...
  (#4881, closes #4367, @shonfeder)

• Allow spaces in the directory argument of the subdir stanza (#4943, fixes
  #4907, @rgrinberg)

• Add a %{toolchain} expansion variable (#4899, fixes #3949, @rgrinberg)

• Include dependencies of executables when creating toplevels (either dune top or dune utop) (#4882, fixes #4872, @Gopiancode)

• Fixes opam META file requires entry for private libs (#4841, fixes #4839, @toots)

• Fixes dune exec not adding .exe on Windows (#4371, fixes #3322, @MisterDA)

• Allow multiple cinaps stanzas in the same directory (#4460, @rgrinberg)

• Fix $ dune subst in empty git repositories (#4441, fixes #3619, @rgrinberg)

• Improve interpretation of ansi escape sequence when spawning processes (#4408,
  fixes #2665, @rgrinberg)

• Allow (package pkg) in dependencies even if pkg is an installed package
  (#4170, @bobot)

• Allow %{version:pkg} to work for external packages (#4104, @kit-ty-kate)

• Add (glob_files_rec <dir>/<glob>) for globbing files recursively (#4176,
  @jeremiedimino)

• Automatically generate empty .mli files for executables and tests (#3768,
  fixes #3745, @craigfe)

• Add ocaml command subgroup for OCaml related commands such as utop, top,
  and merlin (#3936, @rgrinberg).

• Detect unknown variables more eagerly (#4184, @jeremiedimino)

• Improve location of variables and macros in error messages (#4205,
  @jeremiedimino)

• Auto-detect dune-project files as dune files in Emacs (#4222, @shonfeder)

• Dune no longer automatically create or edit dune-project files
  (#4239, fixes #4108, @jeremiedimino)

• Warn if dune-project is not found (fatal in release mode) (#5343, @emillon)

• Cleanup temporary files after running $ dune exec. (#4260, fixes #4243,
  @rgrinberg)

• Add a new subcommand dune ocaml dump-dot-merlin that prints a mix of all the
  merlin configuration of a directory (defaulting to the current directory) in
  the Merlin configuration syntax. (#4250, @voodoos)

• Enable cram tests by default (#4262, @rgrinberg)

• Drop support for opam 1.x (#4280, @jeremiedimino)

• Stop calling ocamlfind to determine the library search path or
  library installation directory. This makes the behavior of Dune
  simpler and more reproducible (#4281, @jeremiedimino)

• Remove the external-lib-deps command. This command was only
  approximative and the cost of maintainance was getting too high. We
  removed it to make room for new more important features (#4298,
  @jeremiedimino)

• It is now possible to define action dependencies through a chain
  of aliases. (#4303, @aalekseyev)

• If an .ml file is not used by an executable, Dune no longer report
  parsing error in this file (#4330, @jeremiedimino)

• Add support for sandboxing using hard links (#4360, Andrey Mokhov)

• Fix dune crash when subdir is an absolute path (#4366, @anmonteiro)

• Changed the implementation of actions attached to aliases, as in
  (rule (alias runtest) (action (run ./test))). A visible result for
  users is that such actions are now memoized for longer. For
  instance:

  $ echo '(rule (alias runtest) (action (echo "X=%{env:X=0}\n")))` > dune
  $ X=1 dune runtest
  X=1
  $ X=2 dune runtest
  X=2
  $ X=1 dune runtest
  

  Previously, Dune would have re-executed the action again at the last
  line. Now it remembers the result of the first execution.

• Fix a bug where dune would always re-run all actions that produce symlinks,
  even if their dependencies did not change. (#4405, @aalekseyev)

• Fix a bug that was causing Dune to re-hash generated files more
  often than necessary (#4419, @jeremiedimino)

• Fields allowed in the config file are now also allowed in the
  workspace file (#4426, @jeremiedimino)

• Add options to control how Dune should handle stdout and stderr of
  actions when then succeed. It is now possible to ask Dune to ignore
  the stdout of actions when they succeed or to request that the
  stderr of actions must be empty. This allows to reduce the noise of
  large builds (#4422, #4515, @jeremiedimino)

• The @all alias no longer depends directly on copies of files from the source
  directory (#4461, @nojb)

• Allow dune-file as an alternative file name for dune files (needs to be
  enabled in the dune-project file) (#4428, @nojb)

• Drop support for upgrading jbuilder projects (#4473, @jeremiedimino)

• Extend the environment variable BUILD_PATH_PREFIX_MAP to rewrite
  the root of the build dir (or sandbox) to /workspace_root (#4466,
  @jeremiedimino)

• Simplify the implementation of build cache. We stop using the cache daemon to
  access the cache and instead write to and read from it directly. The new cache
  implementation is based on Jenga's cache library, which was thoroughly tested
  on large-scale builds. Using Jenga's cache library will also make it easier
  for us to port Jenga's cloud cache to Dune. (#4443, #4465, Andrey Mokhov)

• More informative error message when Dune can't read a target that's supposed
  to be produced by the action. Old message is still produced on ENOENT, but other
  errors deserve a more detailed report. (#4501, @aalekseyev)

• Fixed a bug where a sandboxed action would fail if it declares no dependencies in
  its initial working directory or any directory it chdirs into. (#4509, @aalekseyev)

• Fix a crash when clearing temporary directories (#4489, #4529, Andrey Mokhov)

• Dune now memoizes all errors when running in the file-watching mode. This
  speeds up incremental rebuilds but may be inconvenient in rare cases, e.g. if
  a build action fails due to a spurious error, such as running out of memory.
  Right now, the only way to force such actions to be rebuilt is to restart
  Dune, which clears all memoized errors. In future, we would like to provide a
  way to rerun all actions failed due to errors without restarting the build,
  e.g. via a Dune RPC call. (#4522, Andrey Mokhov)

• Remove dune compute. It was broken and unused (#4540,
  @jeremiedimino)

• No longer generate an approximate merlin files when computing the
  ocaml flags fails, for instance because they include the contents of
  a file that failed to build. This was a niche feature and it was
  getting in the way of making Dune's core better. (#4607, @jeremiedimino)

• Make Dune display the progress indicator in all output modes except quiet
  (#4618, @aalekseyev)

• Report accurate process timing information in trace mode (enabled with
  --trace-file) (#4517, @rgrinberg)

• Do not log live_words and free_words in trace file. This allows using
  Gc.quick_stat which does not scan the heap. (#4643, @emillon)

• Don't let command run by Dune observe the environment variable
  INSIDE_EMACS in order to improve reproducibility (#4680,
  @jeremiedimino)

• Fix root_module when used in public libraries (#4685, fixes #4684,
  @rgrinberg, @craigfe)

• Fix root_module when used with preprocessing (#4683, fixes #4682,
  @rgrinberg, @craigfe)

• Display Coq profile flags in dune printenv (#4767, @ejgallego)

• Introduce mdx stanza 0.2, requiring mdx >= 1.9.0, with a new generic deps
  field and the possibility to statically link libraries in the test
  executable. (#3956, #5391, fixes #3955)

• Improve lookup of optional or disabled binaries. Previously, we'd treat every
  executable with missing libraries as optional. Now, we treat make sure to
  look at the library's optional or enabled_if status (#4786).

• Always use 7 char hash prefix in build info version (#4857, @jberdine, fixes
  #4855)

• Allow to explicitly disable/enable the use of dune subst by adding a
  new (subst <disable|enable>) stanza to the dune-project file.
  (#4864, @kit-ty-kate)

• Simplify the way dune discovers the root of the workspace. It now
  stops at the first dune-workspace file it encounters, and fails if
  it finds neither a dune-workspace nor a dune-project file
  (#4921, fixes #4459, @jeremiedimino)

• Dune no longer reads installed META files for libraries distributed with the
  compiler, instead using its own internal database. (#4946, @nojb)

• Add support for (empty_module_interface_if_absent) in executable and library
  stanzas. (#4955, @nojb)

• Add support for %{bin-available:...} (#4995, @jeremiedimino)

• Make sure running git or hg in a sandboxed action, such as a
  cram test cannot escape the sandbox and pick up some random git or
  mercurial repository on the file system (#4996, @jeremiedimino)

• Allow %{read:...} in more places such as (enabled_if ...)
  (#4994, @jeremiedimino)

• Run each action in its own process group so that we don't leave
  stray processes behind when killing actions (#4998, @jeremiedimino)

• Add an option expand_aliases_in_sandbox (#5003, @jeremiedimino)

• Allow to cancel the initial scan via Control+C (#4460, fixes #4364
  @jeremiedimino)

• Add experimental support for directory targets (#3316, #5025, Andrey Mokhov),
  enabled via (using directory-targets 0.1) in dune-project.

• Delete old promote-into, promote-until-clean and promote-until-clean-into
  syntax (#5091, Andrey Mokhov).

• Add link_flags in the env stanza (#5215)

• Bootstrap: ignore errors when trying to remove generated files. (#5407,
  @damiendoligez)