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Move the management of Jsoo config details out of dune#13613

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vouillon:jsoo-build-config
Mar 14, 2026
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Move the management of Jsoo config details out of dune#13613
rgrinberg merged 1 commit into
ocaml:mainfrom
vouillon:jsoo-build-config

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Dune had to know about all possible Jsoo config to create rules upfront. This is no longer necessary with #13611.

The corresponding Js_of_ocaml changes are in ocsigen/js_of_ocaml#2177.

rgrinberg pushed a commit that referenced this pull request Feb 18, 2026
Refactor jsoo archive generation to use a demand-driven approach.
Previously, rules for all configuration variants were generated upfront
whenever a library was built. This logic is now decoupled from general
library rules; instead, the build system intercepts requests for
specific configuration directories and generates the necessary rules
dynamically.

This will enable the following improvements:
-  The config details can be moved out of dune into jsoo (#13613).
- This will make it possible to implement a more incremental build
process without generating a large volume of unused rules for
unrequested configurations (#13612).

Signed-off-by: Jérôme Vouillon <jerome.vouillon@gmail.com>
@vouillon
vouillon force-pushed the jsoo-build-config branch 2 times, most recently from ff68af5 to 761f25d Compare February 26, 2026 11:24
Dune had to know about all possible Jsoo config to create rules upfront. This is no
longer necessary with ocaml#13611.

Signed-off-by: Jérôme Vouillon <jerome.vouillon@gmail.com>
@vouillon
vouillon marked this pull request as ready for review February 27, 2026 21:45
@hhugo hhugo mentioned this pull request Mar 12, 2026
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@hhugo

hhugo commented Mar 13, 2026

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The corresponding jsoo PR has been merged.

| Double_translation

type t =
type config =

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Do we need to keep this ?

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ignore me

let jsoo_has_build_config jsoo_version =
match jsoo_version with
| Some version ->
(match Version.compare version (6, 4) with

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The config support has been merged into jsoo master. Version 6.4 should be the next version.

@hhugo

hhugo commented Mar 13, 2026

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LGTM

@hhugo hhugo added the jsoo Js_of_ocaml support in dune label Mar 13, 2026
@rgrinberg
rgrinberg merged commit 2dc179b into ocaml:main Mar 14, 2026
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@vouillon
vouillon deleted the jsoo-build-config branch April 14, 2026 14:29
avsm pushed a commit to ocaml/opam-repository that referenced this pull request May 5, 2026
CHANGES:

### Fixed

- Auto-inject `"menhir" {>= "20180523"}` into generated opam files when the
  menhir extension is used. Dune's menhir rules rely on `--infer-write-query`
  and `--infer-read-reply`, which require at least this version; without the
  lower bound, builds fail with older menhir installations.
  (ocaml/dune#10707, @robinbb)

- Fix `--display=quiet` not suppressing "Entering directory" and "Leaving
  directory" messages when using `--root`. These messages are now deferred
  until there is actual output, so silent builds produce no noise.
  (ocaml/dune#12974, fixes ocaml/dune#12854, @Alizter)

- Fix an internal error when a module is shared between a `rocq.theory` and
  `rocq.extraction` stanza. The error now includes a hint pointing to the
  conflicting stanza. (ocaml/dune#13733, @Durbatuluk1701)

- Fix cookies defined on `ppx_rewriter` being lost when that rewriter was used
  as a dependency of another `ppx_rewriter`. (ocaml/dune#13737, fixes ocaml/dune#3426, @Alizter)

- Improve opam file generation for packages that set `(dir ..)`. Such packages
  will now have a test target that is limited to this directory. (ocaml/dune#13778, @rgrinberg)

- Stop duplicating dune diagnostics to subscribers over RPC (ocaml/dune#13816,
  @rgrinberg)

- Fix dependency cycle when using the `package` with a library
  conditionally enabled via `enabled_if`. (ocaml/dune#13833, @toots)

- Fix underspecification of dependencies in the sandbox for modules with
  interfaces. (ocaml/dune#13842, @anmonteiro)

- Honor sandbox settings specified inside `(:include ..)` expressions in the `deps` field
  (ocaml/dune#13898, @rgrinberg)

- Fix `dune pkg lock` failing when a `pin` stanza contains a `file://` URL with
  a relative path outside the workspace (ocaml/dune#13915, fixes ocaml/dune#10254, @shunueda)

- Use all stat attributes to detect patch back source tree changes (ocaml/dune#13986, @rgrinberg)

- Use device and inode number for invalidating cached digests (ocaml/dune#13991, @rgrinberg)

- Stop trying to set SO_REUSEADDR on unix sockets when setting up dune rpc
  (ocaml/dune#14056, @rgrinberg)

- Fix autolocking to correctly detect changes to `(depends)` in watch mode
  (ocaml/dune#14066, fixes ocaml/dune#13234, @Alizter)

- Fix incremental builds for libraries using `(wrapped (transition ...))`.
  The compat shim modules were never recompiled when the inner module's
  interface changed, causing "inconsistent assumptions" errors.
  (ocaml/dune#14090, fixes ocaml/dune#14089, @Alizter)

- Fix Rocq configuration detection to use `rocq c --config` subcommand
  instead of `rocq --config` (ocaml/dune#14093, fixes ocaml/dune#13774, @Durbatuluk1701)

- Bump dune rpc's request pending request limit 10 to 100 (ocaml/dune#14094, @rginberg)

- Invalidate stale cached digests in all build commands (ocaml/dune#14126, @rgrinberg)

- Fix `root_module` generating duplicate module definitions when a
  findlib sub-package shares a directory with its parent (e.g.,
  `logs.lwt` alongside `logs`). (ocaml/dune#14135, fixes ocaml/dune#6148, @robinbb)

- Fix `dune subst` prepending a duplicate `version:` field to opam
  files that already contain one, instead of replacing it in place.
  (ocaml/dune#14136, fixes ocaml/dune#878, @robinbb)

- Fix `@ocaml-index` alias being generated for all contexts, causing build
  errors in multi-context workspaces where some libraries are disabled in
  non-default contexts. The alias is now only generated for the merlin context.
  (ocaml/dune#14137, fixes ocaml/dune#12007, @robinbb)

- Remove the warning about the deprecation of the coq stanza for
  dune lang before 3.21 since it has been introduced in this
  version (ocaml/dune#14187, @bobot)

- `$ dune init` now generates projects with correct .opam files (ocaml/dune#14192, @rgrinberg)

- Send SIGTERM before SIGKILL when cancelling child processes in watch
  mode, giving cleanup handlers a chance to run before escalating.
  (ocaml/dune#14224, ocaml/dune#14170, fixes ocaml/dune#2445, @robinbb)

- Correctly specify dependencies for `generate_runner` in inline tests (ocaml/dune#14276, @rgrinberg)

- Fix duplicate dune version bounds in generated opam files. When users
  declare `(dune (>= X.Y))` matching or exceeding the `(lang dune X.Y)`
  version, the generated opam `depends` no longer contains redundant
  constraints like `{>= "2.7" & >= "2.7"}`. (ocaml/dune#3916, ocaml/dune#11106, @robinbb)

- Fix inline tests not being executed for byte-only libraries. When a library
  has `(modes byte)`, the inline test runner is now linked in byte mode so the
  library's test code is included. (ocaml/dune#9757, @robinbb)

### Added

- Add support for `c_library_flags` in foreign_stubs (ocaml/dune#13484, @madroach)

- Move the management of Jsoo config details out of dune (ocaml/dune#13613, @vouillon)

- Js_of_ocaml: share standalone runtimes (ocaml/dune#13621, @vouillon)

- Allow multiple `(dirs ..)` stanzas in the same Dune file. Starting with
  `(lang dune 3.23)`, Dune takes the union of the specified directories
  (ocaml/dune#13734, fixes ocaml/dune#6249, @anmonteiro)

- Sandboxed rules are now allowed to produce diff promotions when `(corrections
  produce)` is set on the rules. Whenever such an action produces `foo.corrected`, it will
  be automatically registered as a promotion for `foo` (ocaml/dune#13813, @rgrinberg)

- `$ dune clean` now accepts arguments to only remove certain targets from the
  _build directory (ocaml/dune#13875, @rgrinberg)

- `$ dune promote` now promotes all paths that are a prefix of the path provided.
  For example, `$ dune promote foo` will promote `foo`, `foo/bar`, `foo/bar/baz`
  (but not `foobar`). (ocaml/dune#13876, @rgrinberg)

- Allow for the `diff` action to diff entire directories (ocaml/dune#13880, fixes ocaml/dune#3567, @rgrinberg)

- A hint is now emitted when trying to build a target inside a directory that
  was excluded by a `(dirs ...)` stanza (ocaml/dune#13919, @mefyl).

- Add --debug-backtraces to `$ dune {promote,trace,cache}` (ocaml/dune#13933, @rgrinberg)

- Actions are now able to observe their project directory via
  `DUNE_PROJECT_ROOT` (ocaml/dune#13934, @rgrinberg)

- Support hardlink sandboxing on Windows. (ocaml/dune#13987, addresses part of ocaml/dune#4362, @Alizter)

- `rocq.extraction`: Add `extracted_files` field in `(rocq 0.13)`, replacing
  `extracted_modules`, supporting extraction to languages other than OCaml
  (ocaml/dune#13997, @Durbatuluk1701).

- Infer source directories as dependencies when they're as reference
  directories in `diff` actions.

- Add trace events for build start/stop/restarts (ocaml/dune#14163, ocaml/dune#14166, @rgrinberg)

- Generate `compile_commands.json` for C/C++ foreign stubs when building
  `@check` with `(lang dune 3.23)`. This enables `clangd`, `ccls`, and other
  tools that consume compilation databases. (ocaml/dune#14185, fixes ocaml/dune#3531, @Alizter)

- Add trace events for accepting clients and shutting down RPC (ocaml/dune#14232, @rgrinberg)

- Back up the default trace file as `trace.csexp.old` before each build,
  preserving the previous trace for comparison. This does not apply when
  `--trace-file` is used. (ocaml/dune#14269, @Alizter)

### Changed

- Dune digests target files and directories in background threads (ocaml/dune#13341,
  @rgrinbreg)

- `Dyn.pp` now prints valid OCaml literals for more constructors:
  - `Char` is quoted (e.g., `'a'`)
  - `Int32`/`Int64`/`Nativeint` include literal suffixes (`l`/`L`/`n`)
  - `Float` handles `infinity`, `neg_infinity`, and `nan`
  (ocaml/dune#13394, grants ocaml/dune#13378, @Alizter)

- Bump the minimal OCaml version required to build Dune from 4.08 to 4.14.
  (ocaml/dune#13533, @Alizter)

- Starting from 3.23, user rules are sandboxed by default (ocaml/dune#13805, @rgrinberg)

- Dune will no longer stat paths in the _build directory. This was done as protection
  from user rules accidentally touching things in the _build directory. This is forbidden,
  and dune offers rule sandboxing to prevent this (ocaml/dune#13875, @rgrinberg)

- Improve mtime precision by no longer approximating them with floats (ocaml/dune#13962,
  @rgrinberg).

- Remove `--makefile` (or `-m`) in `$ dune rules`. The sexp output is the only
  supported way of reflecting dune rules (ocaml/dune#14069, @rgrinberg)

- Do not automatically promote files. Now, opam files must be manually
  promoted with `$ dune promote`. Their generation is triggered by `@install`,
  `@runtest`, and `@opam`. In release mode, .opam files aren't generated at all
  and whatever is in the source is used (ocaml/dune#14108, @rgrinberg)

- Inline test runner generation is now sandboxed (ocaml/dune#14257, @rgrinberg)
@Alizter Alizter added this to the 3.23.0 milestone Jun 10, 2026
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