ocamltest: complete and clarify support for runtime flags

ocamltest/ocaml_backends.ml

@@ -17,6 +17,10 @@
 
 type t = Native | Bytecode
 
+let is_bytecode t = t=Bytecode
+
+let is_native t = t=Native
+
 let string_of_backend = function
   | Native -> "native"
   | Bytecode -> "bytecode"

ocamltest/ocaml_backends.mli

@@ -17,6 +17,10 @@
 
 type t = Native | Bytecode
 
+val is_bytecode : t -> bool
+
+val is_native : t -> bool
+
 val string_of_backend : t -> string
 
 val make_backend_function : 'a -> 'a -> t -> 'a

ocamltest/ocaml_directories.ml

@@ -29,3 +29,9 @@ let toplevel ocamlsrcdir =
 
 let runtime ocamlsrcdir =
   Filename.make_path [ocamlsrcdir; "byterun"]
+
+let runtime_library backend ocamlsrcdir =
+  let backend_lib_dir = match backend with
+    | Ocaml_backends.Native -> "asmrun"
+    | Ocaml_backends.Bytecode -> "byterun" in
+  Filename.make_path [ocamlsrcdir; backend_lib_dir]

ocamltest/ocaml_directories.mli

@@ -22,3 +22,5 @@ val stdlib : string -> string
 val toplevel : string -> string
 
 val runtime : string -> string
+
+val runtime_library : Ocaml_backends.t -> string -> string

ocamltest/ocaml_flags.ml

@@ -26,25 +26,23 @@ let c_includes ocamlsrcdir =
   let dir = Ocaml_directories.runtime ocamlsrcdir in
   "-ccopt -I" ^ dir
 
-let runtime_flags ocamlsrcdir backend c_files = match backend with
-  | Ocaml_backends.Native -> ""
-  | Ocaml_backends.Bytecode ->
-    if c_files then begin (* custm mode *)
-      let runtime_variant = Ocaml_files.runtime_variant() in
-      let variant_flag = match runtime_variant with
-        | Ocaml_files.Normal -> ""
-        | Ocaml_files.Debug -> " -runtime-variant d"
-        | Ocaml_files.Instrumented -> " -runtime-variant i" in
-      "-custom" ^ variant_flag ^ " -I " ^
-        (Ocaml_directories.runtime ocamlsrcdir)
-      (* when using the debug or instrumented runtimes, we need to include
-         the byterun directory so that libcamlrund and libcamlruni
-         can be found. This is not necessary with the normal runtime
-         because libcamlrun is copied to the stdlib directory which
-         will be included anyway
-      *)
-    end else begin (* non-custom mode *)
-      let ocamlrun = Ocaml_files.ocamlrun ocamlsrcdir in
-      "-use-runtime " ^ ocamlrun
-    end
-      
+let runtime_variant_flags () = match Ocaml_files.runtime_variant() with
+  | Ocaml_files.Normal -> ""
+  | Ocaml_files.Debug -> " -runtime-variant d"
+  | Ocaml_files.Instrumented -> " -runtime-variant i"
+
+let runtime_flags ocamlsrcdir backend c_files =
+  let runtime_library_flags = "-I " ^
+    (Ocaml_directories.runtime_library backend ocamlsrcdir) in
+  let rt_flags = match backend with
+    | Ocaml_backends.Native -> runtime_variant_flags ()
+    | Ocaml_backends.Bytecode ->
+      begin
+        if c_files then begin (* custom mode *)
+          "-custom " ^ (runtime_variant_flags ())
+        end else begin (* non-custom mode *)
+          "-use-runtime " ^ (Ocaml_files.ocamlrun ocamlsrcdir)
+        end
+      end in
+  rt_flags ^ " " ^ runtime_library_flags
+