Build Luv from the rescript-lang/luv fork with libuv 1.53.0

The opam override for Luv now fetches commit 8c12b1a of rescript-lang/luv
(PR rescript-lang/luv#2) instead of patching the upstream 0.5.14 tarball.
The fork vendors libuv 1.53.0 instead of 1.48.0 and already carries the
ARM64 musl -mno-outline-atomics fix, so the local patch is gone. The
package is versioned 0.5.14+rescript.1 and dune-project/rescript.opam pin
that version.

Review: Why a git URL and not a release tarball? The fork keeps libuv as a
git submodule; GitHub archives omit submodules, while opam's git fetch
initializes them. The commit hash should move to the merge commit once
rescript-lang/luv#2 lands.

Review: Does the OCaml rewatch use any changed Luv API? Only FS_event,
Loop, Timer, Handle and Error (native_watcher.ml). The fork's API change
(statfs reserved fields read as zero) does not reach it.

Area: rewatch ci
Output: unchanged
Tests: none, because no observable behavior changes; the shared rewatch
 suite (113 checks, incl. watch mode), the rewatch-ocaml focused suite and
 scripts/test.js -ounit -build -mocha -docstrings pass on the new libuv
Measured: watch edit latency, median of 21 interleaved edits (basic
 fixture) 99 -> 100 ms, A/A control 98 ms; 400-directory fixture 98 -> 102
 ms, A/A control 100 ms; watch cold start, median of 7 (400 dirs) 213 ->
 211 ms, A/A 212 ms; idle watcher CPU over 20 s 70-90 ms for all; clean
 build (400 modules), median of 9, 180 -> 180 ms; linux-arm64 devcontainer
 under load, job tmp watch_ab.py and clean_ab.py
Signed-off-by: Christoph Knittel <ck@cca.io>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Q9Q6perkzKBQQebDnVXAEK

Author: cknitt

.github/opam-repository/README.md

@@ -3,12 +3,10 @@
 This repository contains narrowly scoped dependency fixes needed by CI before
 they are available from the main opam repository.
 
-The Luv 0.5.14 override preserves the ARM64 musl compiler's
-`-mno-outline-atomics` requirement while building vendored libuv. Without it,
-the static executable fails to link because libuv refers to glibc's internal
-`__getauxval` symbol. The patch should be contributed upstream and this
-override removed once a fixed Luv release is available.
-
-Luv 0.5.14 also vendors libuv 1.48.0. Evaluating and contributing an update to
-a current libuv 1.x release is a separate upstream follow-up; changing the
-vendored library is intentionally outside the OCaml rewatch port.
+The Luv override builds Luv from a commit of the
+[rescript-lang/luv](https://github.com/rescript-lang/luv) fork. The fork
+vendors libuv 1.53.0 (upstream Luv 0.5.14 vendors 1.48.0) and preserves the
+ARM64 musl compiler's `-mno-outline-atomics` requirement, without which the
+static executable fails to link because libuv refers to glibc's internal
+`__getauxval` symbol. Remove the override once a Luv release with these
+changes is available.

…-repository/packages/luv/luv.0.5.14/opam …/packages/luv/luv.0.5.14+rescript.1/opam.github/opam-repository/packages/luv/luv.0.5.14/opam renamed to .github/opam-repository/packages/luv/luv.0.5.14+rescript.1/opam .github/opam-repository/packages/luv/luv.0.5.14/opam renamed to .github/opam-repository/packages/luv/luv.0.5.14+rescript.1/opam

@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "luv"
-version: "0.5.14"
+version: "0.5.14+rescript.1"
 synopsis: "Binding to libuv: cross-platform asynchronous I/O"
 description: """\
 Luv is a binding to libuv, the cross-platform C library that does
@@ -13,30 +13,23 @@ alternative to the standard module Unix."""
 maintainer: "Anton Bachin <antonbachin@yahoo.com>"
 authors: "Anton Bachin <antonbachin@yahoo.com>"
 license: "MIT"
-homepage: "https://github.com/aantron/luv"
+homepage: "https://github.com/rescript-lang/luv"
 doc: "https://aantron.github.io/luv"
-bug-reports: "https://github.com/aantron/luv/issues"
+bug-reports: "https://github.com/rescript-lang/luv/issues"
 depends: [
   "base-unix" {build}
+  "conf-linux-libc-dev" {build & os = "linux"}
   "ctypes" {>= "0.14.0"}
   "dune" {>= "2.7.0"}
+  "integers" {>= "0.3.0"}
   "ocaml" {>= "4.03.0"}
   "alcotest" {with-test & >= "0.8.1"}
   "base-unix" {with-test}
   "odoc" {with-doc & = "2.4.0"}
 ]
 build: ["dune" "build" "-p" name "-j" jobs]
-patches: ["arm64-musl-outline-atomics.patch"]
-extra-files: [
-  [
-    "arm64-musl-outline-atomics.patch"
-    "sha256=c15c4c4d34c9b545197c5160e19c69a128cc186b65a54e0e9a779c2543528a4f"
-  ]
-]
-dev-repo: "git+https://github.com/aantron/luv.git"
+dev-repo: "git+https://github.com/rescript-lang/luv.git"
 url {
   src:
-    "https://github.com/aantron/luv/releases/download/0.5.14/luv-0.5.14.tar.gz"
-  checksum:
-    "sha256=8e01b4a50c8876cdd98d8e245c0687c4dc4d883aed161ad9c5ace1fb1fdaae99"
+    "git+https://github.com/rescript-lang/luv.git#8c12b1accfce5bce12f1818b233028240d5927b6"
 }

.github/opam-repository/packages/luv/luv.0.5.14/files/arm64-musl-outline-atomics.patch

@@ -0,0 +1 @@
+- Build the OCaml rewatch against libuv 1.53.0 via the rescript-lang/luv fork. https://github.com/rescript-lang/rescript/pull/8883

changes/luv-libuv-1-53.internal.md

@@ -35,7 +35,7 @@
   (cmdliner
    (= 2.1.1))
   (luv
-   (= 0.5.14))
+   (= 0.5.14+rescript.1))
   (re
    (= 1.14.0))
   (ounit2

dune-project

@@ -17,7 +17,7 @@ depends: [
   "yojson" {= "3.0.0"}
   "spawn" {= "v0.17.0"}
   "cmdliner" {= "2.1.1"}
-  "luv" {= "0.5.14"}
+  "luv" {= "0.5.14+rescript.1"}
   "re" {= "1.14.0"}
   "ounit2" {with-test & = "2.2.7"}
   "odoc" {with-doc}