Merge branch 'ta/werror' into dev

* ta/werror:
  snmp: extend warnings_as_errors test
  systools: add warnings_as_errors option
  asn1ct: add warnings_as_errors option
  leex: optimize werror/1
  yecc: optimize werror/1
  yecc: use more descriptive name: 'werror'
  leex: use more descriptive name: 'werror'
  compile: optimize werror/1
  compile: log warnings as errors if -Werror is enabled
  yecc: log warnings as errors if -Werror is enabled
  leex: log warnings as errors if -Werror is enabled
  yecc: honour -Werror passed from erlc
  leex: honour -Werror passed from erlc
  Do not write beam file if Werr and warnings /= []
  parsetools: test if warnings_as_errors writes file

OTP-9536

5 files changed, 206 insertions, 94 deletions

diff --git a/lib/sasl/doc/src/systools.xml b/lib/sasl/doc/src/systools.xml
index 883c9c372b..8c1c327d74 100644
--- a/lib/sasl/doc/src/systools.xml
+++ b/lib/sasl/doc/src/systools.xml
@@ -45,7 +45,8 @@
         <v>Name = string()</v>
         <v>UpFrom = DownTo = [Name | {Name,Descr}]</v>
         <v>&nbsp;Descr = term()</v>
-        <v>Opt = {path,[Dir]} | restart_emulator | silent | noexec | {outdir,Dir}</v>
+        <v>Opt = {path,[Dir]} | restart_emulator | silent | noexec | {outdir,Dir}
+	| warnings_as_errors</v>
         <v>&nbsp;Dir = string()</v>
         <v>Result = ok | error | {ok,Relup,Module,Warnings} | {error,Module,Error}</v>
         <v>&nbsp;Relup - see relup(4)</v>
@@ -122,6 +123,8 @@
         <p>If the option <c>noexec</c> is provided, the function returns
           the same values as for <c>silent</c> but no <c>relup</c> file
           is created.</p>
+	<p>If the option <c>warnings_as_errors</c> is provided, warnings
+	   are treated as errors.</p>
       </desc>
     </func>
     <func>
@@ -130,7 +133,8 @@
       <fsummary>Generate a boot script <c>.script/.boot</c>.</fsummary>
       <type>
         <v>Name = string()</v>
-        <v>Opt = src_tests | {path,[Dir]} | local | {variables,[Var]} | exref | {exref,[App]}] | silent | {outdir,Dir}</v>
+        <v>Opt = src_tests | {path,[Dir]} | local | {variables,[Var]} | exref | {exref,[App]}]
+	| silent | {outdir,Dir} | warnings_as_errors</v>
         <v>&nbsp;Dir = string()</v>
         <v>&nbsp;Var = {VarName,Prefix}</v>
         <v>&nbsp;&nbsp;VarName = Prefix = string()</v>
@@ -232,6 +236,8 @@
           Warnings and errors can be converted to strings by calling
           <c>Module:format_warning(Warnings)</c> or
           <c>Module:format_error(Error)</c>.</p>
+	<p>If the option <c>warnings_as_errors</c> is provided, warnings
+	   are treated as errors.</p>
       </desc>
     </func>
     <func>
diff --git a/lib/sasl/src/systools_lib.erl b/lib/sasl/src/systools_lib.erl
index f951647b79..1b6ea125d9 100644
--- a/lib/sasl/src/systools_lib.erl
+++ b/lib/sasl/src/systools_lib.erl
@@ -24,7 +24,7 @@
 %%         
 
 -export([file_term2binary/2, read_term/1, read_term_from_stream/2,
-	 get_dirs/1, get_path/1]).
+	 get_dirs/1, get_path/1, werror/2]).
 
 -include_lib("kernel/include/file.hrl").
 
@@ -219,6 +219,7 @@ flat([H|T], Ack) ->
     flat(T, [H|Ack]);
 flat([], Ack) ->
     lists:reverse(Ack).
-    
-			       
+
+werror(Options, Warnings) ->
+    lists:member(warnings_as_errors, Options) andalso Warnings =/= [].
 
diff --git a/lib/sasl/src/systools_make.erl b/lib/sasl/src/systools_make.erl
index 5dc83e7b2a..7f400f5cce 100644
--- a/lib/sasl/src/systools_make.erl
+++ b/lib/sasl/src/systools_make.erl
@@ -44,10 +44,12 @@
 
 %%-----------------------------------------------------------------
 %% Create a boot script from a release file.
-%% Options is a list of {path, Path} | silent | local where path sets
-%% the search path, silent supresses error message printing on console,
-%% local generates a script with references to the directories there
-%% the applications are found.
+%% Options is a list of {path, Path} | silent | local
+%%         | warnings_as_errors
+%% where path sets the search path, silent supresses error message
+%% printing on console, local generates a script with references
+%% to the directories there the applications are found,
+%% and warnings_as_errors treats warnings as errors.
 %%
 %% New options: {path,Path} can contain wildcards
 %%              src_tests
@@ -85,11 +87,16 @@ make_script(RelName, Output, Flags) when is_list(RelName),
 	    ModTestP = {member(src_tests, Flags),xref_p(Flags)},
 	    case get_release(RelName, Path, ModTestP, machine(Flags)) of
 		{ok, Release, Appls, Warnings} ->
-		    case generate_script(Output,Release,Appls,Flags) of
-			ok ->
+		    case systools_lib:werror(Flags, Warnings) of
+			true ->
 			    return(ok,Warnings,Flags);
-			Error ->
-			    return(Error,Warnings,Flags)
+			false ->
+			    case generate_script(Output,Release,Appls,Flags) of
+				ok ->
+				    return(ok,Warnings,Flags);
+				Error ->
+				    return(Error,Warnings,Flags)
+			    end
 		    end;
 		Error ->
 		    return(Error,[],Flags)
@@ -130,10 +137,21 @@ get_outdir(Flags) ->
 return(ok,Warnings,Flags) ->
     case member(silent,Flags) of
 	true ->
-	    {ok,?MODULE,Warnings};
+	    case systools_lib:werror(Flags, Warnings) of
+		true ->
+		    error;
+		false ->
+		    {ok,?MODULE,Warnings}
+	    end;
 	_ ->
-	    io:format("~s",[format_warning(Warnings)]),
-	    ok
+	    case member(warnings_as_errors,Flags) of
+		true ->
+		    io:format("~s",[format_warning(Warnings, true)]),
+		    error;
+		false ->
+		    io:format("~s",[format_warning(Warnings)]),
+		    ok
+	    end
     end;
 return({error,Mod,Error},_,Flags) ->
     case member(silent,Flags) of
@@ -1833,78 +1851,89 @@ get_flag(_,_)         -> false.
 %% Check Options for make_script
 check_args_script(Args) ->
     cas(Args,
-	{undef, undef, undef, undef, undef, undef, undef, undef, []}). 
+	{undef, undef, undef, undef, undef, undef, undef, undef,
+	 undef, []}).
 
-cas([], {_Path,_Sil,_Loc,_Test,_Var,_Mach,_Xref,_XrefApps, X}) ->
+cas([], {_Path,_Sil,_Loc,_Test,_Var,_Mach,_Xref,_XrefApps,_Werror, X}) ->
     X;
 %%% path ---------------------------------------------------------------
-cas([{path, P} | Args], {Path, Sil, Loc, Test, Var, Mach, 
-			 Xref, XrefApps, X}) when is_list(P) -> 
+cas([{path, P} | Args], {Path, Sil, Loc, Test, Var, Mach, Xref,
+			 XrefApps, Werror, X}) when is_list(P) ->
     case check_path(P) of
 	ok ->
-	    cas(Args, {P, Sil, Loc, Test, Var, Mach, Xref, XrefApps,X});
+	    cas(Args, {P, Sil, Loc, Test, Var, Mach, Xref, XrefApps,
+		       Werror, X});
 	error ->
 	    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps,
-		       X++[{path,P}]})
+		       Werror, X++[{path,P}]})
     end;
 %%% silent -------------------------------------------------------------
-cas([silent | Args], {Path, _Sil, Loc, Test, Var, Mach,
-		      Xref, XrefApps, X}) ->
-    cas(Args, {Path, silent, Loc, Test, Var, Mach, Xref, XrefApps, X});
+cas([silent | Args], {Path, _Sil, Loc, Test, Var, Mach, Xref,
+		      XrefApps, Werror, X}) ->
+    cas(Args, {Path, silent, Loc, Test, Var, Mach, Xref, XrefApps,
+	       Werror, X});
 %%% local --------------------------------------------------------------
-cas([local | Args], {Path, Sil, _Loc, Test, Var, Mach,
-		     Xref, XrefApps, X}) ->
-    cas(Args, {Path, Sil, local, Test, Var, Mach, Xref, XrefApps, X});
+cas([local | Args], {Path, Sil, _Loc, Test, Var, Mach, Xref,
+		     XrefApps, Werror, X}) ->
+    cas(Args, {Path, Sil, local, Test, Var, Mach, Xref, XrefApps,
+	       Werror, X});
 %%% src_tests -------------------------------------------------------
-cas([src_tests | Args], {Path, Sil, Loc, _Test, Var, Mach,
-			    Xref, XrefApps, X}) ->
+cas([src_tests | Args], {Path, Sil, Loc, _Test, Var, Mach, Xref,
+			 XrefApps, Werror, X}) ->
     cas(Args,
-	{Path, Sil, Loc, src_tests, Var, Mach, Xref, XrefApps,X});
+	{Path, Sil, Loc, src_tests, Var, Mach, Xref, Werror, XrefApps,X});
 %%% variables ----------------------------------------------------------
-cas([{variables, V} | Args], {Path, Sil, Loc, Test, Var, Mach, 
-				 Xref, XrefApps, X}) when is_list(V) ->
+cas([{variables, V} | Args], {Path, Sil, Loc, Test, Var, Mach, Xref,
+			      XrefApps, Werror, X}) when is_list(V) ->
     case check_vars(V) of
 	ok ->
 	    cas(Args,
-		{Path, Sil, Loc, Test, V, Mach, Xref, XrefApps, X});
+		{Path, Sil, Loc, Test, V, Mach, Xref, XrefApps, Werror, X});
 	error ->
 	    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps,
-		       X++[{variables, V}]})
+		       Werror, X++[{variables, V}]})
     end;
 %%% machine ------------------------------------------------------------
-cas([{machine, M} | Args], {Path, Sil, Loc, Test, Var, Mach, 
-			    Xref, XrefApps, X}) when is_atom(M) ->
-    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, X});
+cas([{machine, M} | Args], {Path, Sil, Loc, Test, Var, Mach, Xref,
+			    XrefApps, Werror, X}) when is_atom(M) ->
+    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, Werror, X});
 %%% exref --------------------------------------------------------------
-cas([exref | Args], {Path, Sil, Loc, Test, Var, Mach,
-		     _Xref, XrefApps, X})  ->
-    cas(Args, {Path, Sil, Loc, Test, Var, Mach, exref, XrefApps, X});
+cas([exref | Args], {Path, Sil, Loc, Test, Var, Mach, _Xref,
+		     XrefApps, Werror, X})  ->
+    cas(Args, {Path, Sil, Loc, Test, Var, Mach, exref, XrefApps, Werror, X});
 %%% exref Apps ---------------------------------------------------------
-cas([{exref, Apps} | Args], {Path, Sil, Loc, Test, Var, Mach, 
-			     Xref, XrefApps, X}) when is_list(Apps) ->
+cas([{exref, Apps} | Args], {Path, Sil, Loc, Test, Var, Mach, Xref,
+			     XrefApps, Werror, X}) when is_list(Apps) ->
     case check_apps(Apps) of 
 	ok ->
 	    cas(Args, {Path, Sil, Loc, Test, Var, Mach, 
-			     Xref, Apps, X});
+		       Xref, Apps, Werror, X});
 	error ->
 	    cas(Args, {Path, Sil, Loc, Test, Var, Mach, 
-			     Xref, XrefApps, X++[{exref, Apps}]})
+		       Xref, XrefApps, Werror, X++[{exref, Apps}]})
     end;
 %%% outdir Dir ---------------------------------------------------------
-cas([{outdir, Dir} | Args], {Path, Sil, Loc, Test, Var, Mach,
-			     Xref, XrefApps, X}) when is_list(Dir) ->
-    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, X});
+cas([{outdir, Dir} | Args], {Path, Sil, Loc, Test, Var, Mach, Xref,
+			     XrefApps, Werror, X}) when is_list(Dir) ->
+    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, Werror, X});
 %%% otp_build (secret, not documented) ---------------------------------
-cas([otp_build | Args], {Path, Sil, Loc, Test, Var, Mach,
-			 Xref, XrefApps, X}) ->
-    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, X});
+cas([otp_build | Args], {Path, Sil, Loc, Test, Var, Mach, Xref,
+			 XrefApps, Werror, X}) ->
+    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, Werror, X});
 %%% no_module_tests (kept for backwards compatibility, but ignored) ----
-cas([no_module_tests | Args], {Path, Sil, Loc, Test, Var, Mach,
-			       Xref, XrefApps, X}) ->
-    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps,X});
+cas([no_module_tests | Args], {Path, Sil, Loc, Test, Var, Mach, Xref,
+			       XrefApps, Werror, X}) ->
+    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, Werror, X});
+%%% warnings_as_errors (kept for backwards compatibility, but ignored) ----
+cas([warnings_as_errors | Args], {Path, Sil, Loc, Test, Var, Mach, Xref,
+				  XrefApps, _Werror, X}) ->
+    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps,
+	       warnings_as_errors, X});
 %%% ERROR --------------------------------------------------------------
-cas([Y | Args], {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, X}) ->
-    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps,X++[Y]}).
+cas([Y | Args], {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps,
+		 Werror, X}) ->
+    cas(Args, {Path, Sil, Loc, Test, Var, Mach, Xref, XrefApps, Werror,
+	       X++[Y]}).
 
 
 
@@ -2030,7 +2059,6 @@ check_apps([H|T]) when is_atom(H) ->
 check_apps(_) ->
     error.
 
-
 %% Format error
 
 format_error(badly_formatted_release) ->
@@ -2144,21 +2172,31 @@ form_tar_err({add, File, Error}) ->
 %% Format warning
 
 format_warning(Warnings) ->
-    map(fun({warning,W}) -> form_warn(W) end, Warnings).
-
-form_warn({source_not_found,{Mod,_,App,_,_}}) ->
-    io_lib:format("*WARNING* ~p: Source code not found: ~p.erl~n",
-		  [App,Mod]);
-form_warn({{parse_error, File},{_,_,App,_,_}}) ->
-    io_lib:format("*WARNING* ~p: Parse error: ~p~n",
-		  [App,File]);
-form_warn({obj_out_of_date,{Mod,_,App,_,_}}) ->
-    io_lib:format("*WARNING* ~p: Object code (~p) out of date~n",[App,Mod]);
-form_warn({exref_undef, Undef}) ->
-    F = fun({M,F,A}) -> 
-		io_lib:format("*WARNING* Undefined function ~p:~p/~p~n", 
-			      [M,F,A])
+    format_warning(Warnings, false).
+
+format_warning(Warnings, Werror) ->
+    Prefix = case Werror of
+		 true ->
+		     "";
+		 false ->
+		     "*WARNING* "
+	     end,
+    map(fun({warning,W}) -> form_warn(Prefix, W) end, Warnings).
+
+form_warn(Prefix, {source_not_found,{Mod,_,App,_,_}}) ->
+    io_lib:format("~s~p: Source code not found: ~p.erl~n",
+		  [Prefix,App,Mod]);
+form_warn(Prefix, {{parse_error, File},{_,_,App,_,_}}) ->
+    io_lib:format("~s~p: Parse error: ~p~n",
+		  [Prefix,App,File]);
+form_warn(Prefix, {obj_out_of_date,{Mod,_,App,_,_}}) ->
+    io_lib:format("~s~p: Object code (~p) out of date~n",
+		  [Prefix,App,Mod]);
+form_warn(Prefix, {exref_undef, Undef}) ->
+    F = fun({M,F,A}) ->
+		io_lib:format("~sUndefined function ~p:~p/~p~n",
+			      [Prefix,M,F,A])
 	end,
     map(F, Undef);
-form_warn(What) ->
-    io_lib:format("*WARNING* ~p~n", [What]).
+form_warn(Prefix, What) ->
+    io_lib:format("~s ~p~n", [Prefix,What]).
diff --git a/lib/sasl/src/systools_relup.erl b/lib/sasl/src/systools_relup.erl
index ec5486226c..6d9e922900 100644
--- a/lib/sasl/src/systools_relup.erl
+++ b/lib/sasl/src/systools_relup.erl
@@ -122,7 +122,7 @@
 %% rel_filename() = description() = string()
 %% Opts = [opt()]
 %% opt() = {path, [path()]} | silent | noexec | restart_emulator
-%%       | {outdir, string()}
+%%       | {outdir, string()} | warnings_as_errors
 %% path() = [string()]
 %% Ret = ok | error | {ok, Relup, Module, Warnings} | {error, Module, Error}
 %%
@@ -139,8 +139,9 @@
 %% 
 %% The option `path' sets search path, `silent' suppresses printing of
 %% error messages to the console, `noexec' inhibits the creation of
-%% the output "relup" file, and restart_emulator ensures that the new
-%% emulator is restarted (as the final step).
+%% the output "relup" file, restart_emulator ensures that the new
+%% emulator is restarted (as the final step), and `warnings_as_errors'
+%% treats warnings as errors.
 %% ----------------------------------------------------------------
 mk_relup(TopRelFile, BaseUpRelDcs, BaseDnRelDcs) ->
     mk_relup(TopRelFile, BaseUpRelDcs, BaseDnRelDcs, []).
@@ -153,14 +154,29 @@ mk_relup(TopRelFile, BaseUpRelDcs, BaseDnRelDcs, Opts) ->
 		{false, false} ->
 		    case R of
 			{ok, _Res, _Mod, Ws} -> 
-			    print_warnings(Ws),
-			    ok;
+			    print_warnings(Ws, Opts),
+			    case systools_lib:werror(Opts, Ws) of
+				true ->
+				    error;
+				false ->
+				    ok
+			    end;
 			Other -> 
 			    print_error(Other),
 			    error
 		    end;
-		_ -> 
-		    R
+		_ ->
+		    case R of
+			{ok, _Res, _Mod, Ws} ->
+			    case systools_lib:werror(Opts, Ws) of
+				true ->
+				    error;
+				false ->
+				    R
+			    end;
+			R ->
+			    R
+		    end
 	    end;
 	BadArg ->
 	    erlang:error({badarg, BadArg})
@@ -195,7 +211,12 @@ do_mk_relup(TopRelFile, BaseUpRelDcs, BaseDnRelDcs, Path, Opts) ->
 	    {Dn, Ws2} = foreach_baserel_dn(TopRel, TopApps, BaseDnRelDcs, 
 					  Path, Opts, Ws1),
 	    Relup = {TopRel#release.vsn, Up, Dn},
-	    write_relup_file(Relup, Opts),
+	    case systools_lib:werror(Opts, Ws2) of
+		true ->
+		    ok;
+		false ->
+		    write_relup_file(Relup, Opts)
+	    end,
 	    {ok, Relup, ?MODULE, Ws2};
 	Other -> 
 	    throw(Other)
@@ -527,20 +548,29 @@ format_error(Error) ->
     io:format("~p~n", [Error]).
 
 
-print_warnings(Ws) when is_list(Ws) ->
-    lists:foreach(fun(W) -> print_warning(W) end, Ws);
-print_warnings(W) ->
-    print_warning(W).
+print_warnings(Ws, Opts) when is_list(Ws) ->
+    lists:foreach(fun(W) -> print_warning(W, Opts) end, Ws);
+print_warnings(W, Opts) ->
+    print_warning(W, Opts).
 
-print_warning(W) ->
-    S = format_warning(W),
+print_warning(W, Opts) ->
+    Prefix = case lists:member(warnings_as_errors, Opts) of
+		 true ->
+		     "";
+		 false ->
+		     "*WARNING* "
+	     end,
+    S = format_warning(Prefix, W),
     io:format("~s", [S]).
 
-format_warning({erts_vsn_changed, {Rel1, Rel2}}) ->
-    io_lib:format("*WARNING* The ERTS version changed between ~p and ~p~n",
-		  [Rel1, Rel2]);
-format_warning(What) ->
-    io_lib:format("*WARNING* ~p~n",[What]).
+format_warning(W) ->
+    format_warning("*WARNING* ", W).
+
+format_warning(Prefix, {erts_vsn_changed, {Rel1, Rel2}}) ->
+    io_lib:format("~sThe ERTS version changed between ~p and ~p~n",
+		  [Prefix, Rel1, Rel2]);
+format_warning(Prefix, What) ->
+    io_lib:format("~s~p~n",[Prefix, What]).
 
 
 get_reason({error, {open, _, _}}) -> open;
diff --git a/lib/sasl/test/systools_SUITE.erl b/lib/sasl/test/systools_SUITE.erl
index 539f6de99d..e352247d44 100644
--- a/lib/sasl/test/systools_SUITE.erl
+++ b/lib/sasl/test/systools_SUITE.erl
@@ -396,6 +396,7 @@ src_tests_script(Config) when is_list(Config) ->
     ?line PSAVE = code:get_path(),		% Save path
 
     ?line {LatestDir, LatestName} = create_script(latest,Config),
+    ?line BootFile = LatestName ++ ".boot",
 
     ?line DataDir = filename:absname(?copydir),
     ?line LibDir = fname([DataDir, d_missing_src, lib]),
@@ -416,14 +417,32 @@ src_tests_script(Config) when is_list(Config) ->
     ?line Erl2 = filename:join([P1,"..","src","db2.erl"]),
     ?line file:delete(Erl2),
 
-    %% Then make script - two warnings should be issued when
-    %% src_tests is given
+    %% Then make script
+
+    %% .boot file should not exist
+    ?line ok = file:delete(BootFile),
+    ?line false = filelib:is_regular(BootFile),
+    %% With warnings_as_errors and src_tests option, an error should be issued
+    ?line error =
+	systools:make_script(LatestName, [silent, {path, N}, src_tests,
+					  warnings_as_errors]),
+    ?line error =
+	systools:make_script(LatestName, [{path, N}, src_tests,
+					  warnings_as_errors]),
+
+    %% due to warnings_as_errors .boot file should still not exist
+    ?line false = filelib:is_regular(BootFile),
+
+    %% Two warnings should be issued when src_tests is given
     %% 1. old object code for db1.beam
     %% 2. missing source code for db2.beam
     ?line {ok, _, [{warning,{obj_out_of_date,_}},
 		   {warning,{source_not_found,_}}]} =
 	systools:make_script(LatestName, [silent, {path, N}, src_tests]),
 
+    %% .boot file should exist now
+    ?line true = filelib:is_regular(BootFile),
+
     %% Without the src_tests option, no warning should be issued
     ?line {ok, _, []} =
 	systools:make_script(LatestName, [silent, {path, N}]),
@@ -1150,6 +1169,21 @@ normal_relup(Config) when is_list(Config) ->
 			    [{path, P}, silent]),
     ?line ok = check_relup([{db, "2.1"}], [{db, "1.0"}]),
 
+    %% file should not be written if warnings_as_errors is enabled.
+    %% delete before running tests.
+    ?line ok = file:delete("relup"),
+
+    %% Check that warnings are treated as errors
+    ?line error =
+	systools:make_relup(LatestName, [LatestName2], [LatestName1],
+			    [{path, P}, warnings_as_errors]),
+    ?line error =
+	systools:make_relup(LatestName, [LatestName2], [LatestName1],
+			    [{path, P}, silent, warnings_as_errors]),
+
+    %% relup file should not exist
+    ?line false = filelib:is_regular("relup"),
+
     %% Check that warnings get through
     ?line ok = systools:make_relup(LatestName, [LatestName2], [LatestName1],
 				   [{path, P}]),
@@ -1159,6 +1193,9 @@ normal_relup(Config) when is_list(Config) ->
 			    [{path, P}, silent]),
     ?line ok = check_relup([{fe, "3.1"}, {db, "2.1"}], [{db, "1.0"}]),
 
+    %% relup file should exist now
+    ?line true = filelib:is_regular("relup"),
+
     ?line ok = file:set_cwd(OldDir),
     ok.