ocamlPackages.buildTopkgPackage: Added

This function helps building an OCaml package that builds with topkg.
There are currently many such packages in nixpkgs and this function
would greatly simplify adding more.

This is heavily inspired by `ocamlPackages.buildDunePackage`.

1 files changed, 28 insertions, 0 deletions

diff --git a/pkgs/build-support/ocaml/topkg.nix b/pkgs/build-support/ocaml/topkg.nix
new file mode 100644
index 0000000000000..73be5815e44c7
--- /dev/null
+++ b/pkgs/build-support/ocaml/topkg.nix
@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchurl, ocaml, findlib, topkg, ocamlbuild, cmdliner, odoc, b0
+}:
+
+{ pname, version, nativeBuildInputs ? [ ], buildInputs ? [ ], ... }@args:
+
+lib.throwIf (args ? minimalOCamlVersion
+  && lib.versionOlder ocaml.version args.minimalOCamlVersion)
+"${pname}-${version} is not available for OCaml ${ocaml.version}"
+
+stdenv.mkDerivation ({
+
+  dontAddStaticConfigureFlags = true;
+  configurePlatforms = [ ];
+  strictDeps = true;
+  inherit (topkg) buildPhase installPhase;
+
+} // (builtins.removeAttrs args [ "minimalOCamlVersion" ]) // {
+
+  name = "ocaml${ocaml.version}-${pname}-${version}";
+
+  nativeBuildInputs = [ ocaml findlib ocamlbuild topkg ] ++ nativeBuildInputs;
+  buildInputs = [ topkg ] ++ buildInputs;
+
+  meta = (args.meta or { }) // {
+    platforms = args.meta.platforms or ocaml.meta.platforms;
+  };
+
+})