Fix make depend for jane street stdlib modules (#2493)

ocaml/.depend

@@ -1768,7 +1768,6 @@ typing/typecore.cmo : \
     typing/typedtree.cmi \
     typing/typedecl.cmi \
     typing/subst.cmi \
-    typing/solver.cmi \
     typing/shape.cmi \
     typing/rec_check.cmi \
     typing/printtyp.cmi \
@@ -1811,7 +1810,6 @@ typing/typecore.cmx : \
     typing/typedtree.cmx \
     typing/typedecl.cmx \
     typing/subst.cmx \
-    typing/solver.cmx \
     typing/shape.cmx \
     typing/rec_check.cmx \
     typing/printtyp.cmx \

ocaml/driver/makedepend.ml

@@ -100,14 +100,38 @@ let add_to_synonym_list synonyms suffix =
 (* Find file 'name' (capitalized) in search path *)
 let find_module_in_load_path name =
   let names = List.map (fun ext -> name ^ ext) (!mli_synonyms @ !ml_synonyms) in
+  let uname = String.uncapitalize_ascii name in
   let unames =
-    let uname = String.uncapitalize_ascii name in
     List.map (fun ext -> uname ^ ext) (!mli_synonyms @ !ml_synonyms)
   in
+  let stdlib_unames =
+    (* Jane Street: This is a hack to deal with the fact that we refer to our
+       custom stdlib modules with names like [Stdlib__Int32_u] from within the
+       stdlib.
+
+       Dependencies are calculated by looking at all modules mentioned by the
+       code in question and checking to see if there is a corresponding ml file.
+       But in our case there is no corresponding ml file, because the references
+       look like `Stdlib__Int32_u.foo` and the ml file's name is just
+       `int32_u.ml`.  This is unlike normal stdlib modules, which are exposed
+       with names that match their ml files.  So, the code here just teaches
+       make depend to optionally ignore a `Stdlib__` prefix for the purposes of
+       checking for a matching ml file. *)
+    let stdlib_prefix = "stdlib__" in
+    if String.starts_with ~prefix:stdlib_prefix uname then
+      let plen = String.length stdlib_prefix in
+      let uname =
+        String.sub name plen (String.length name - plen)
+      in
+      let uname = String.uncapitalize_ascii uname in
+      List.map (fun ext -> uname ^ ext) (!mli_synonyms @ !ml_synonyms)
+    else
+      []
+  in
   let rec find_in_array a pos =
     if pos >= Array.length a then None else begin
       let s = a.(pos) in
-      if List.mem s names || List.mem s unames then
+      if List.mem s names || List.mem s unames || List.mem s stdlib_unames then
         Some s
       else
         find_in_array a (pos + 1)

ocaml/ocamldoc/.depend

@@ -480,8 +480,7 @@ odoc_info.cmi : \
     odoc_extension.cmi \
     odoc_exception.cmi \
     odoc_class.cmi \
-    ../parsing/location.cmi \
-    ../parsing/asttypes.cmi
+    ../parsing/location.cmi
 odoc_latex.cmo : \
     odoc_to_text.cmi \
     odoc_messages.cmi \
@@ -594,8 +593,7 @@ odoc_misc.cmx : \
 odoc_misc.cmi : \
     ../typing/types.cmi \
     odoc_types.cmi \
-    ../parsing/longident.cmi \
-    ../parsing/asttypes.cmi
+    ../parsing/longident.cmi
 odoc_module.cmo : \
     ../typing/types.cmi \
     odoc_value.cmi \
@@ -743,6 +741,7 @@ odoc_see_lexer.cmx : \
 odoc_see_lexer.cmi : \
     odoc_parser.cmi
 odoc_sig.cmo : \
+    ../typing/typetexp.cmi \
     ../typing/types.cmi \
     ../typing/typedtree.cmi \
     ../parsing/parsetree.cmi \
@@ -769,6 +768,7 @@ odoc_sig.cmo : \
     ../parsing/asttypes.cmi \
     odoc_sig.cmi
 odoc_sig.cmx : \
+    ../typing/typetexp.cmx \
     ../typing/types.cmx \
     ../typing/typedtree.cmx \
     ../parsing/parsetree.cmi \
@@ -950,15 +950,13 @@ odoc_value.cmo : \
     odoc_parameter.cmi \
     odoc_name.cmi \
     odoc_misc.cmi \
-    ../parsing/asttypes.cmi \
     odoc_value.cmi
 odoc_value.cmx : \
     ../typing/types.cmx \
     odoc_types.cmx \
     odoc_parameter.cmx \
     odoc_name.cmx \
     odoc_misc.cmx \
-    ../parsing/asttypes.cmi \
     odoc_value.cmi
 odoc_value.cmi : \
     ../typing/types.cmi \

ocaml/stdlib/.depend

@@ -541,10 +541,14 @@ stdlib__Int64.cmx : int64.ml \
 stdlib__Int64.cmi : int64.mli \
     stdlib.cmi
 stdlib__Int64_u.cmo : int64_u.ml \
+    stdlib__Nativeint_u.cmi \
+    stdlib__Int32_u.cmi \
     stdlib.cmi \
     stdlib__Int64.cmi \
     stdlib__Int64_u.cmi
 stdlib__Int64_u.cmx : int64_u.ml \
+    stdlib__Nativeint_u.cmx \
+    stdlib__Int32_u.cmx \
     stdlib.cmx \
     stdlib__Int64.cmx \
     stdlib__Int64_u.cmi
@@ -666,10 +670,12 @@ stdlib__Nativeint.cmx : nativeint.ml \
 stdlib__Nativeint.cmi : nativeint.mli \
     stdlib.cmi
 stdlib__Nativeint_u.cmo : nativeint_u.ml \
+    stdlib__Int32_u.cmi \
     stdlib.cmi \
     stdlib__Nativeint.cmi \
     stdlib__Nativeint_u.cmi
 stdlib__Nativeint_u.cmx : nativeint_u.ml \
+    stdlib__Int32_u.cmx \
     stdlib.cmx \
     stdlib__Nativeint.cmx \
     stdlib__Nativeint_u.cmi