ocamlPackages.ppx_deriving: 4.1 -> 4.2

This fixes compilation of ppx_deriving with OCaml 4.05.

js_of_ocaml_2: mark as broken with OCaml 4.05

ocamlPackages.cohttp: propagates ppx_deriving

pkgs/development/ocaml-modules/cohttp/default.nix

···
 { stdenv, fetchFromGitHub, ocaml, findlib, jbuilder
-, ppx_fields_conv, ppx_sexp_conv
+, ppx_fields_conv, ppx_sexp_conv, ppx_deriving
 , base64, fieldslib, jsonm, logs, re, stringext, uri
 }:
 
···
 
 	buildInputs = [ ocaml findlib jbuilder jsonm ppx_fields_conv ppx_sexp_conv ];
 
-	propagatedBuildInputs = [ base64 fieldslib re stringext uri ];
+	propagatedBuildInputs = [ ppx_deriving base64 fieldslib re stringext uri ];
 
 	buildPhase = "jbuilder build -p cohttp";
 

pkgs/development/ocaml-modules/ppx_deriving/default.nix

···
 { stdenv, buildOcaml, ocaml, fetchzip
-, cppo, ppx_tools, result, ounit
+, cppo, ppx_tools, ppx_derivers, result, ounit, ocaml-migrate-parsetree
 }:
 
+let param =
+  if ocaml.version == "4.03.0"
+  then {
+    version = "4.1";
+    sha256 = "0cy9p8d8cbcxvqyyv8fz2z9ypi121zrgaamdlp4ld9f3jnwz7my9";
+    extraPropagatedBuildInputs = [];
+  } else {
+    version = "4.2";
+    sha256 = "0scsg45wp6xdqj648fz155r4yngyl2xcd3hdszfzqwdpbax33914";
+    extraPropagatedBuildInputs = [ ocaml-migrate-parsetree ppx_derivers ];
+}; in
+
 buildOcaml rec {
   name = "ppx_deriving";
-  version = "4.1";
+  inherit (param) version;
 
   minimumSupportedOcamlVersion = "4.02";
 
   src = fetchzip {
     url = "https://github.com/whitequark/${name}/archive/v${version}.tar.gz";
-    sha256 = "0cy9p8d8cbcxvqyyv8fz2z9ypi121zrgaamdlp4ld9f3jnwz7my9";
+    inherit (param) sha256;
   };
 
   hasSharedObjects = true;
 
   buildInputs = [ cppo ounit ];
-  propagatedBuildInputs =
+  propagatedBuildInputs = param.extraPropagatedBuildInputs ++
     [ ppx_tools result ];
 
   installPhase = "OCAMLPATH=$OCAMLPATH:`ocamlfind printconf destdir` make install";
···
     description = "deriving is a library simplifying type-driven code generation on OCaml >=4.02.";
     maintainers = [ maintainers.maurer ];
     license = licenses.mit;
-    broken = versionAtLeast ocaml.version "4.05";
   };
 }

pkgs/development/tools/ocaml/js_of_ocaml/default.nix

···
     maintainers = [
       maintainers.gal_bolle
     ];
+    broken = versionAtLeast ocaml.version "4.05";
   };
 }