CHANGES: - Second step of the deprecation of jbuilder: the `jbuilder` binary now emits a warning on every startup and both `jbuilder` and `dune` emit warnings when encountering `jbuild` files (ocaml/dune#1752, @diml) - Change the layout of build artifacts inside _build. The new layout enables optimizations that depend on the presence of `.cmx` files of private modules (ocaml/dune#1676, @bobot) - Fix merlin handling of private module visibility (ocaml/dune#1653 @bobot) - unstable-fmt: use boxes to wrap some lists (ocaml/dune#1608, fix ocaml/dune#1153, @emillon, thanks to @rgrinberg) - skip directories when looking up programs in the PATH (ocaml/dune#1628, fixes ocaml/dune#1616, @diml) - Use `lsof` on macOS to implement `--stats` (ocaml/dune#1636, fixes ocaml/dune#1634, @xclerc) - Generate `dune-package` files for every package. These files are installed and read instead of `META` files whenever they are available (ocaml/dune#1329, @rgrinberg) - Fix preprocessing for libraries with `(include_subdirs ..)` (ocaml/dune#1624, fix ocaml/dune#1626, @nojb, @rgrinberg) - Do not generate targets for archive that don't match the `modes` field. (ocaml/dune#1632, fix ocaml/dune#1617, @rgrinberg) - When executing actions, open files lazily and close them as soon as possible in order to reduce the maximum number of file descriptors opened by Dune (ocaml/dune#1635, ocaml/dune#1643, fixes ocaml/dune#1633, @jonludlam, @rgrinberg, @diml) - Reimplement the core of Dune using a new generic memoization system (ocaml/dune#1489, @rudihorn, @diml) - Replace the broken cycle detection algorithm by a state of the art one from [this paper](https://doi.org/10.1145/2756553) (ocaml/dune#1489, @rudihorn) - Get the correct environment node for multi project workspaces (ocaml/dune#1648, @rgrinberg) - Add `dune compute` to call internal memoized functions (ocaml/dune#1528, @rudihorn, @diml) - Add `--trace-file` option to trace dune internals (ocaml/dune#1639, fix ocaml/dune#1180, @emillon) - Add `--no-print-directory` (borrowed from GNU make) to suppress `Entering directory` messages. (ocaml/dune#1668, @dra27) - Remove `--stats` and track fd usage in `--trace-file` (ocaml/dune#1667, @emillon) - Add virtual libraries feature and enable it by default (ocaml/dune#1430 fixes ocaml/dune#921, @rgrinberg) - Fix handling of Control+C in watch mode (ocaml/dune#1678, fixes ocaml/dune#1671, @diml) - Look for jsoo runtime in the same dir as the `js_of_ocaml` binary when the ocamlfind package is not available (ocaml/dune#1467, @nojb) - Make the `seq` package available for OCaml >= 4.07 (ocaml/dune#1714, @rgrinberg) - Add locations to error messages where a rule fails to generate targets and rules that require files outside the build/source directory. (ocaml/dune#1708, fixes ocaml/dune#848, @rgrinberg) - Let `Configurator` handle `sizeof` (in addition to negative numbers). (ocaml/dune#1726, fixes ocaml/dune#1723, @Chris00) - Fix an issue causing menhir generated parsers to fail to build in some cases. The fix is to systematically use `-short-paths` when calling `ocamlc -i` (ocaml/dune#1743, fix ocaml/dune#1504, @diml) - Never raise when printing located errors. The code that would print the location excerpts was prone to raising. (ocaml/dune#1744, fix ocaml/dune#1736, @rgrinberg) - Add a `dune upgrade` command for upgrading jbuilder projects to Dune (ocaml/dune#1749, @diml) - When automatically creating a `dune-project` file, insert the detected name in it (ocaml/dune#1749, @diml) - Add `(implicit_transitive_deps <bool>)` mode to dune projects. When this mode is turned off, transitive dependencies are not accessible. Only listed dependencies are directly accessible. (ocaml/dune#1734, ocaml/dune#430, @rgrinberg, @hnrgrgr) - Add `toplevel` stanza. This stanza is used to define toplevels with libraries already preloaded. (ocaml/dune#1713, @rgrinberg) - Generate `.merlin` files that account for normal preprocessors defined using a subset of the `action` language. (ocaml/dune#1768, @rgrinberg) - Emit `(orig_src_dir <path>)` metadata in `dune-package` for dune packages built with `--store-orig-source-dir` command line flag (also controlled by `DUNE_STORE_ORIG_SOURCE_DIR` env variable). This is later used to generate `.merlin` with `S`-directives pointed to original source locations and thus allowing merlin to see those. (ocaml/dune#1750, @andreypopp) - Improve the behavior of `dune promote` when the files to be promoted have been deleted. (ocaml/dune#1775, fixes ocaml/dune#1772, @diml) - unstable-fmt: preserve comments (ocaml/dune#1766, @emillon) - Pass flags correctly when using `staged_pps` (ocaml/dune#1779, fixes ocaml/dune#1774, @diml) - Fix an issue with the use of `(mode promote)` in the menhir stanza. It was previously causing intermediate *mock* files to be promoted (ocaml/dune#1783, fixes ocaml/dune#1781, @diml) - unstable-fmt: ignore files using OCaml syntax (ocaml/dune#1784, @emillon) - Configurator: Add `which` function to replace the `which` command line utility in a cross platform way. (ocaml/dune#1773, fixes ocaml/dune#1705, @Chris00) - Make configurator append paths to `$PKG_CONFIG_PATH` on macOS. Previously it was prepending paths and thus `$PKG_CONFIG_PATH` set by users could have been overridden by homebrew installed libraries (ocaml/dune#1785, @andreypopp) - Disallow c/cxx sources that share an object file in the same stubs archive. This means that `foo.c` and `foo.cpp` can no longer exist in the same library. (ocaml/dune#1788, @rgrinberg) - Forbid use of `%{targets}` (or `${@}` in jbuild files) inside preprocessing actions (ocaml/dune#1812, fixes ocaml/dune#1811, @diml) - Add `DUNE_PROFILE` environment variable to easily set the profile. (ocaml/dune#1806, @rgrinberg) - Deprecate the undocumented `(no_keep_locs)` field. It was only necessary until virtual libraries were supported (ocaml/dune#1822, fix ocaml/dune#1816, @diml) - Rename `unstable-fmt` to `format-dune-file` and remove its `--inplace` option. (ocaml/dune#1821, @emillon). - Autoformatting: `(using fmt 1.1)` will also format dune files (ocaml/dune#1821, @emillon). - Autoformatting: record dependencies on `.ocamlformat-ignore` files (ocaml/dune#1824, fixes ocaml/dune#1793, @emillon)

Consider adding a cross platform which to configurator #1705

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Consider adding a cross platform `which` to configurator #1705