Fix issue #3737

CHANGES.md

@@ -18,6 +18,9 @@ Unreleased
 
 - Add (enabled_if ...) to (copy_files ...) (#3756, @nojb)
 
+- Make sure Dune cleans up the status line before exiting (#3767,
+  fixes #3737, @dosaylazy)
+
 2.7.1 (2/09/2020)
 -----------------
 

bootstrap.ml

@@ -4,7 +4,7 @@ open Printf
 (* This program performs version checking of the compiler and switches to the
    secondary compiler if necessary. The script should execute in OCaml 4.02! *)
 
-let min_supported_natively = (4, 08)
+let min_supported_natively = (4, 08, 0)
 
 let verbose, keep_generated_files, debug =
   let anon s = raise (Arg.Bad (sprintf "don't know what to do with %s\n" s)) in
@@ -65,7 +65,7 @@ let read_file fn =
   s
 
 let () =
-  let v = Scanf.sscanf Sys.ocaml_version "%d.%d" (fun a b -> (a, b)) in
+  let v = Scanf.sscanf Sys.ocaml_version "%d.%d.%d" (fun a b c -> (a, b, c)) in
   let compiler, which =
     if v >= min_supported_natively then
       ("ocamlc", None)
@@ -77,15 +77,15 @@ let () =
       prerr_endline s;
       if n <> 0 || s <> "" then (
         Format.eprintf "@[%a@]@." Format.pp_print_text
-          (sprintf
+          (let a, b, _ = min_supported_natively in
+           sprintf
              "The ocamlfind's secondary toolchain does not seem to be \
               correctly installed.\n\
               Dune requires OCaml %d.%02d or later to compile.\n\
               Please either upgrade your compile or configure a secondary \
               OCaml compiler (in opam, this can be done by installing the \
               ocamlfind-secondary package)."
-             (fst min_supported_natively)
-             (snd min_supported_natively));
+             a b);
         exit 2
       );
       (compiler, Some "--secondary")
@@ -94,7 +94,7 @@ let () =
     (runf "%s %s -w -24 -g -o %s -I boot unix.cma %s" compiler
        (* Make sure to produce a self-contained binary as dlls tend to cause
           issues *)
-       ( if v < (4, 10) then
+       ( if v < (4, 10, 1) then
          "-custom"
        else
          "-output-complete-exe" )

src/dune_engine/scheduler.ml

@@ -702,7 +702,6 @@ end = struct
     let fiber =
       Fiber.Var.set t_var t (fun () -> Fiber.with_error_handler f ~on_error)
     in
-    Console.Status_line.set (Fun.const None);
     match Fiber.run fiber ~iter with
     | res ->
       assert (Event.pending_jobs () = 0);
@@ -712,14 +711,16 @@ end = struct
 
   let run_and_cleanup t f =
     let res = run t f in
-    ( match res with
-    | Error Files_changed ->
-      Console.Status_line.set (fun () ->
-          Some
-            (Pp.seq
-               (Pp.tag User_message.Style.Error (Pp.verbatim "Had errors"))
-               (Pp.verbatim ", killing current build...")))
-    | _ -> () );
+    let status_line =
+      match res with
+      | Error Files_changed ->
+        Some
+          (Pp.seq
+             (Pp.tag User_message.Style.Error (Pp.verbatim "Had errors"))
+             (Pp.verbatim ", killing current build..."))
+      | _ -> None
+    in
+    Console.Status_line.set (Fun.const status_line);
     match kill_and_wait_for_all_processes t () with
     | Got_signal -> Error Got_signal
     | Ok -> res