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diff --git a/helm/software/myocamlbuild.ml b/helm/software/myocamlbuild.ml
new file mode 100644 (file)
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+++ b/helm/software/myocamlbuild.ml
@@ -0,0 +1,67 @@
+open Ocamlbuild_plugin
+open Command (* no longer needed for OCaml >= 3.10.2 *)
+
+(* these functions are not really officially exported *)
+let run_and_read = Ocamlbuild_pack.My_unix.run_and_read
+let blank_sep_strings = Ocamlbuild_pack.Lexers.blank_sep_strings
+
+(* this lists all supported packages *)
+let find_packages () =
+  blank_sep_strings &
+    Lexing.from_string &
+      run_and_read "ocamlfind list | cut -d' ' -f1"
+
+(* this is supposed to list available syntaxes, but I don't know how to do it. *)
+let find_syntaxes () = ["camlp4o"; "camlp4r"]
+
+(* ocamlfind command *)
+let ocamlfind x = S[A"ocamlfind"; x]
+
+let _ = dispatch begin function
+   | Before_options ->
+       (* by using Before_options one let command line options have an higher priority *)
+       (* on the contrary using After_options will guarantee to have the higher priority *)
+
+       (* override default commands by ocamlfind ones *)
+       Options.ocamlc     := ocamlfind & A"ocamlc";
+       Options.ocamlopt   := ocamlfind & A"ocamlopt";
+       Options.ocamldep   := ocamlfind & A"ocamldep";
+       Options.ocamldoc   := ocamlfind & A"ocamldoc";
+       Options.ocamlmktop := ocamlfind & A"ocamlmktop"
+
+   | After_rules ->
+
+       (* When one link an OCaml library/binary/package, one should use -linkpkg *)
+       flag ["ocaml"; "link"] & A"-linkpkg";
+
+       (* For each ocamlfind package one inject the -package option when
+               * compiling, computing dependencies, generating documentation and
+               * linking. *)
+       List.iter begin fun pkg ->
+         flag ["ocaml"; "compile";  "pkg_"^pkg] & S[A"-package"; A pkg];
+         flag ["ocaml"; "ocamldep"; "pkg_"^pkg] & S[A"-package"; A pkg];
+         flag ["ocaml"; "doc";      "pkg_"^pkg] & S[A"-package"; A pkg];
+         flag ["ocaml"; "link";     "pkg_"^pkg] & S[A"-package"; A pkg];
+       end (find_packages ());
+
+       (* Like -package but for extensions syntax. Morover -syntax is useless
+               * when linking. *)
+       List.iter begin fun syntax ->
+         flag ["ocaml"; "compile";  "syntax_"^syntax] & S[A"-syntax"; A syntax];
+         flag ["ocaml"; "ocamldep"; "syntax_"^syntax] & S[A"-syntax"; A syntax];
+         flag ["ocaml"; "doc";      "syntax_"^syntax] & S[A"-syntax"; A syntax];
+       end (find_syntaxes ());
+       
+       (* The default "thread" tag is not compatible with ocamlfind.
+          Indeed, the default rules add the "threads.cma" or "threads.cmxa"
+          options when using this tag. When using the "-linkpkg" option with
+          ocamlfind, this module will then be added twice on the command line.
+       
+          To solve this, one approach is to add the "-thread" option when using
+          the "threads" package using the previous plugin.
+        *)
+       flag ["ocaml"; "pkg_threads"; "compile"] (S[A "-thread"]);
+       flag ["ocaml"; "pkg_threads"; "link"] (S[A "-thread"])
+       
+   | _ -> ()
+end