Fix opaque calculation for includes

Signed-off-by: Rudi Grinberg <rudi.grinberg@gmail.com>

src/compilation_context.ml

@@ -5,7 +5,7 @@ module SC = Super_context
 module Includes = struct
   type t = string list Arg_spec.t Cm_kind.Dict.t
 
-  let make sctx ~opaque ~requires : _ Cm_kind.Dict.t =
+  let make sctx ~requires : _ Cm_kind.Dict.t =
     match requires with
     | Error exn -> Cm_kind.Dict.make_all (Arg_spec.Dyn (fun _ -> raise exn))
     | Ok libs ->
@@ -19,13 +19,18 @@ module Includes = struct
                    ]
       in
       let cmx_includes =
-        if opaque then
-          cmi_includes
-        else
-          Arg_spec.S [ iflags
-                    ; Hidden_deps
-                        (SC.Libs.file_deps sctx libs ~ext:".cmi-and-.cmx")
-                    ]
+        Arg_spec.S
+          [ iflags
+          ; Hidden_deps
+              ( libs
+                |> List.map ~f:(fun lib ->
+                  (lib, if Lib.opaque lib then
+                     ".cmi"
+                   else
+                     ".cmi-and-.cmx"))
+                |> SC.Libs.file_deps_with_exts sctx
+              )
+          ]
       in
       { cmi = cmi_includes
       ; cmo = cmi_includes
@@ -84,7 +89,7 @@ let create ~super_context ~scope ~dir ?(dir_kind=File_tree.Dune_file.Kind.Dune)
   ; lib_interface_module
   ; flags
   ; requires
-  ; includes = Includes.make super_context ~requires ~opaque
+  ; includes = Includes.make super_context ~requires
   ; preprocessing
   ; no_keep_locs
   ; opaque

src/lib.ml

@@ -338,6 +338,8 @@ let plugins      t = t.info.plugins
 let jsoo_runtime t = t.info.jsoo_runtime
 let unique_id    t = t.unique_id
 
+let opaque       t = t.info.opaque
+
 let dune_version t = t.info.dune_version
 
 let src_dir t = t.info.src_dir

src/lib.mli

@@ -26,6 +26,8 @@ val archives     : t -> Path.t list Mode.Dict.t
 val plugins      : t -> Path.t list Mode.Dict.t
 val jsoo_runtime : t -> Path.t list
 
+val opaque : t -> bool
+
 val dune_version : t -> Syntax.Version.t option
 
 (** A unique integer identifier. It is only unique for the duration of

src/super_context.ml

@@ -708,6 +708,15 @@ module Libs = struct
            (lib_files_alias ~dir ~name:(Library.best_name lib) ~ext))
        |> Path.Set.of_list)
 
+  let file_deps_with_exts t lib_exts =
+    List.rev_map lib_exts ~f:(fun ((lib : Lib.t), ext) ->
+      if Lib.is_local lib then
+        Alias.stamp_file
+          (lib_files_alias ~dir:(Lib.src_dir lib) ~name:(Lib.name lib) ~ext)
+      else
+        Build_system.stamp_file_for_files_of t.build_system
+          ~dir:(Lib.obj_dir lib) ~ext)
+
   let file_deps t libs ~ext =
     List.rev_map libs ~f:(fun (lib : Lib.t) ->
       if Lib.is_local lib then

src/super_context.mli

@@ -197,6 +197,8 @@ module Libs : sig
       all the files with extension [ext] of libraries [libs]. *)
   val file_deps : t -> Lib.L.t -> ext:string -> Path.t list
 
+  val file_deps_with_exts : t -> (Lib.t * string) list -> Path.t list
+
   (** Setup the alias that depends on all files with a given extension
       for a library *)
   val setup_file_deps_alias