diff --git a/compiler/heptagon/main/hept_compiler.ml b/compiler/heptagon/main/hept_compiler.ml
index af7394e..4f299d1 100644
--- a/compiler/heptagon/main/hept_compiler.ml
+++ b/compiler/heptagon/main/hept_compiler.ml
@@ -30,9 +30,10 @@
 open Compiler_options
 open Compiler_utils
 
-let pp p = if !verbose then Hept_printer.print stdout p
+let compile_program p log_c =
+
+  let pp p = if !verbose then Hept_printer.print log_c p in
 
-let compile_program p =
   (* Typing *)
   let p = silent_pass "Statefulness check" true Stateful.program p in
   let p = silent_pass "Unsafe check" true Unsafe.program p in
diff --git a/compiler/heptagon/main/hept_parser_scoper.ml b/compiler/heptagon/main/hept_parser_scoper.ml
index 2651be1..dae31f0 100644
--- a/compiler/heptagon/main/hept_parser_scoper.ml
+++ b/compiler/heptagon/main/hept_parser_scoper.ml
@@ -31,8 +31,6 @@ open Compiler_options
 open Compiler_utils
 open Location
 
-let pp p = if !verbose then Hept_printer.print stdout p
-
 let parse parsing_fun lexbuf =
   try
     parsing_fun Hept_lexer.token lexbuf
@@ -46,7 +44,10 @@ let parse parsing_fun lexbuf =
         syntax_error l
 
 (** Parse an implementation [lexbuf] *)
-let parse_program modname lexbuf =
+let parse_program modname lexbuf out_log =
+
+  let pp p = if !verbose then Hept_printer.print out_log p in
+
   (* Parsing of the file *)
   let p = do_silent_pass "Parsing" (parse Hept_parser.program) lexbuf in
   let p = { p with Hept_parsetree.p_modname = modname } in
diff --git a/compiler/main/heptc.ml b/compiler/main/heptc.ml
index 1d52802..cf30b51 100644
--- a/compiler/main/heptc.ml
+++ b/compiler/main/heptc.ml
@@ -67,12 +67,19 @@ let compile_program modname source_f =
   let output = String.uncapitalize_ascii modname in
   let epci_f = output ^ ".epci" in
   let mls_f = output ^ ".mls" in
+  let log_f = output ^ ".log" in
 
   (* input/output channels *)
   let source_c, lexbuf = lexbuf_from_file source_f in
   let epci_c = open_out_bin epci_f in
   let mls_c = open_out mls_f in
-  let close_all_files () = close_in source_c; close_out epci_c; close_out mls_c in
+  let log_c = open_out log_f in
+  let close_all_files () =
+    close_in source_c;
+    close_out epci_c;
+    close_out mls_c;
+    close_out log_c
+  in
 
   try
   (* Activates passes according to the backend used *)
@@ -80,19 +87,20 @@ let compile_program modname source_f =
   (* Record timing information *)
     Compiler_timings.start_compiling modname;
   (* Process the [lexbuf] to an Heptagon AST *)
-    let p = Hept_parser_scoper.parse_program modname lexbuf in
+    let p = Hept_parser_scoper.parse_program modname lexbuf log_c in
   (* Process the Heptagon AST *)
-    let p = Hept_compiler.compile_program p in
+    let p = Hept_compiler.compile_program p log_c in
   (* Compile Heptagon to MiniLS *)
-    let p = do_pass "Translation into MiniLS" Hept2mls.program p Mls_compiler.pp in
+    let p = do_pass "Translation into MiniLS"
+                    Hept2mls.program p (Mls_compiler.pp log_c) in
   (* Output the .mls *)
     do_silent_pass "MiniLS serialization" (fun () -> Mls_printer.print mls_c p) ();
   (* Process the MiniLS AST *)
-    let p = Mls_compiler.compile_program p in
+    let p = Mls_compiler.compile_program p log_c in
   (* Output the .epci *)
     output_value epci_c (Modules.current_module ());
   (* Generate the sequential code *)
-    Mls2seq.program p;
+    Mls2seq.program p log_c;
     close_all_files ();
     Compiler_timings.report_statistics ()
   with x -> close_all_files (); raise x
diff --git a/compiler/main/mls2seq.ml b/compiler/main/mls2seq.ml
index df02fef..3d88924 100644
--- a/compiler/main/mls2seq.ml
+++ b/compiler/main/mls2seq.ml
@@ -102,7 +102,7 @@ let find_target s =
       Not_found -> language_error s; raise Errors.Error
 
 
-let generate_target p s =
+let generate_target p out s =
 (*  let print_unfolded p_list =
     comment "Unfolding";
     if !Compiler_options.verbose
@@ -116,7 +116,7 @@ let generate_target p s =
         do_silent_pass "Code generation from MiniLS" convert_fun p
     | Obc convert_fun ->
         let o = mls2obc p in
-        let o = Obc_compiler.compile_program o in
+        let o = Obc_compiler.compile_program out o in
         do_silent_pass "Code generation from Obc" convert_fun o
     | Minils_no_params convert_fun ->
         let p_list = callgraph p in
@@ -124,7 +124,7 @@ let generate_target p s =
     | Obc_no_params convert_fun ->
         let p_list = callgraph p in
         let o_list = mls2obc_list p_list in
-        let o_list = List.map Obc_compiler.compile_program o_list in
+        let o_list = List.map (Obc_compiler.compile_program out) o_list in
         do_silent_pass "Code generation from Obc (w/o params)"         List.iter convert_fun o_list
     | Disabled_target ->
         warn "ignoring unavailable target `%s'." name
@@ -144,12 +144,12 @@ let load_conf () =
   with Arg.Bad m -> raise (Arg.Bad ("After loading target configurations: "^m))
 
 (** Translation into dataflow and sequential languages, defaults to obc. *)
-let program p =
+let program p out =
   let targets = match !target_languages with
     | [] -> ["obc"] (* by default, generate obc file *)
     | l -> l in
   let targets = if !create_object_file then "epo"::targets else targets in
-  List.iter (generate_target p) targets
+  List.iter (generate_target p out) targets
 
 let interface i =
   let targets = match !target_languages with
diff --git a/compiler/minils/main/mls_compiler.ml b/compiler/minils/main/mls_compiler.ml
index 8d12cc6..387e758 100644
--- a/compiler/minils/main/mls_compiler.ml
+++ b/compiler/minils/main/mls_compiler.ml
@@ -30,7 +30,7 @@
 open Compiler_utils
 open Compiler_options
 
-let pp p = if !verbose then Mls_printer.print stdout p
+let pp out p = if !verbose then Mls_printer.print out p
 
 ;; IFDEF ENABLE_CTRLN THEN
 
@@ -58,17 +58,20 @@ let gen_n_output_ctrln p =
   end nodes;
   p
 
-let maybe_ctrln_pass p =
+let maybe_ctrln_pass p pp =
   let ctrln = List.mem "ctrln" !target_languages in
   pass "Controllable Nbac generation" ctrln gen_n_output_ctrln p pp
 
 ;; ELSE
 
-let maybe_ctrln_pass p = p
+let maybe_ctrln_pass p pp = p
 
 ;; END
 
-let compile_program p =
+let compile_program p log_c =
+
+  let pp p = pp log_c p in
+
   (* Clocking *)
   let p =
     try pass "Clocking" true Clocking.program p pp
@@ -113,7 +116,7 @@ let compile_program p =
   if z3z && ctrln then
     warn "ignoring target `ctrln' (incompatible with target `z3z').";
 
-  let p = maybe_ctrln_pass p in
+  let p = maybe_ctrln_pass p pp in
   let p = pass "Sigali generation" z3z Sigalimain.program p pp in
 
   (* Re-scheduling after generation *)
diff --git a/compiler/obc/java/java14_main.ml b/compiler/obc/java/java14_main.ml
index 28bed5a..b803b1c 100644
--- a/compiler/obc/java/java14_main.ml
+++ b/compiler/obc/java/java14_main.ml
@@ -11,8 +11,6 @@ let mk_var ty name =
 
 
 let program p =
-  (*Scalarize*)
-  let p = Compiler_utils.pass "Scalarize" true Scalarize.program p Obc_compiler.pp in
   let p_java = Obc2java14.program p in
   let dir = Compiler_utils.build_path "java" in
   Compiler_utils.ensure_dir dir;
@@ -68,7 +66,7 @@ let program p =
           let jbool = Eclass(Names.qualname_of_string "Boolean") in
           let jsys = Eclass(Names.qualname_of_string "java.lang.System") in
           let jminus = pervasives_qn "-" in
-	  let jplus = pervasives_qn "+" in
+          let jplus = pervasives_qn "+" in
 
           (* parse arguments to give to the main *)
           let rec parse_args t_l i = match t_l with
@@ -91,16 +89,16 @@ let program p =
             (* no more arg to give to main, the last one if it exists is the iteration nb *)
             Aifelse(Efun(Names.pervasives_qn ">", [ Efield (exp_args, "length"); Sint t_size ]),
                     (* given max number of iterations *)
-		    mk_block [Aassgn(pat_step,
-				     Emethod_call(jint, "parseInt", [get_arg t_size]))],
+                    mk_block [Aassgn(pat_step,
+                                     Emethod_call(jint, "parseInt", [get_arg t_size]))],
                     (* default max number of iterations *)
-		    mk_block [Aassgn(pat_step, Evar id_step_dnb)]);
+                    mk_block [Aassgn(pat_step, Evar id_step_dnb)]);
           in
           let ret = Emethod_call(e_main, "step", []) in
           let main_for_loop _ =
 (*             [Aexp (Emethod_call(out, "printf", *)
-(* 				[Sstring "%d => %s\\n"; Evar i; print_ret]))] *)
-	    [Aexp ret]
+(*                                 [Sstring "%d => %s\\n"; Evar i; print_ret]))] *)
+            [Aexp ret]
           in
           let vd_t1, e_t1 =
             let id = Idents.gen_var "java_main" "t" in
@@ -111,11 +109,11 @@ let program p =
             Anewvar(vd_t1, Emethod_call(jsys, "currentTimeMillis", []));
             Obc2java14.fresh_for exp_step main_for_loop;
             Aexp (Emethod_call(out, "print",
-			       [ Efun(jplus,
-				      [Sstring "time : %d\\n";
-				       Efun(jminus,
-					    [Emethod_call(jsys, "currentTimeMillis", []);
-					     e_t1])])]))
+                               [ Efun(jplus,
+                                      [Sstring "time : %d\\n";
+                                       Efun(jminus,
+                                            [Emethod_call(jsys, "currentTimeMillis", []);
+                                             e_t1])])]))
           ]
         in
         mk_block ~locals:[vd_step] acts
diff --git a/compiler/obc/main/obc_compiler.ml b/compiler/obc/main/obc_compiler.ml
index a81a754..0540b91 100644
--- a/compiler/obc/main/obc_compiler.ml
+++ b/compiler/obc/main/obc_compiler.ml
@@ -29,9 +29,9 @@
 open Compiler_utils
 open Compiler_options
 
-let pp p = if !verbose then Obc_printer.print stdout p
+let compile_program out p =
 
-let compile_program p =
+  let pp p = if !verbose then Obc_printer.print out p in
 
   (* Memory allocation application *)
   let p = pass "Application of Memory Allocation"
@@ -45,8 +45,8 @@ let compile_program p =
 
   (*Dead code removal*)
   let p = pass "Dead code removal"
-	       (!do_mem_alloc || !do_linear_typing || !deadcode)
-	       Deadcode.program p pp in
+               (!do_mem_alloc || !do_linear_typing || !deadcode)
+               Deadcode.program p pp in
 
   (*Control optimization*)
   let p = pass "Control optimization" true Control.program p pp in