Split benchmark into yojson-bench package.

bench/dune

@@ -1,5 +1,7 @@
 (executable
  (name bench)
+ (package yojson-bench)
+ (public_name yojson-bench)
  (flags (-safe-string))
  (libraries yojson core_bench core))
 

yojson-bench.opam

@@ -0,0 +1,25 @@
+opam-version: "2.0"
+maintainer: ["[email protected]" "[email protected]"]
+authors: ["Martin Jambon"]
+homepage: "https://github.com/ocaml-community/yojson"
+bug-reports: "https://github.com/ocaml-community/yojson/issues"
+dev-repo: "git+https://github.com/ocaml-community/yojson.git"
+doc: "https://ocaml-community.github.io/yojson/"
+license: "BSD-3-Clause"
+build: [
+  ["dune" "subst"] {pinned}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+depends: [
+  "ocaml" {>= "4.02.3"}
+  "yojson" {= version}
+  "dune"
+  "core_bench"
+]
+synopsis:
+  "Run Yojson benchmarks"
+description: """
+Yojson benchmarks require `Core_bench` which is not a dependency of Yojson,
+because it is not part of the regular installation/testing flow. This is solely
+meant for developers that are worried about performance changes in Yojson.
+"""

yojson.opam

@@ -17,8 +17,6 @@ depends: [
   "dune"
   "cppo" {build}
   "alcotest" {with-test & >= "0.8.5"}
-  "core_bench" {with-test}
-  "core" {with-test}
   "odoc" {with-doc}
 ]
 synopsis: