Merge branch 'maint' of super:otp into maint

* 'maint' of super:otp:
  Revert "Merge branch 'nox/compile-column-numbers' into maint"
  compiler: Warn if the size of a binary segment is invalid
  Allow non-ASCII characters in Xref filanmes
  Add powerpc dso xcomp file

12 files changed, 306 insertions, 83 deletions

diff --git a/lib/compiler/doc/src/compile.xml b/lib/compiler/doc/src/compile.xml
index b87e32a3d9..be9eb1cd75 100644
--- a/lib/compiler/doc/src/compile.xml
+++ b/lib/compiler/doc/src/compile.xml
@@ -108,11 +108,6 @@
 	    See the <em>Efficiency Guide</em> for further information.</p>
           </item>
 
-          <tag><c>column</c></tag>
-          <item>
-            <p>The compiler will keep the column numbers while parsing.</p>
-          </item>
-
           <tag><c>compressed</c></tag>
           <item>
             <p>The compiler will compress the generated object code,
diff --git a/lib/compiler/src/compile.erl b/lib/compiler/src/compile.erl
index fbaacc08da..7365706b94 100644
--- a/lib/compiler/src/compile.erl
+++ b/lib/compiler/src/compile.erl
@@ -41,7 +41,7 @@
 
 -type option() :: atom() | {atom(), term()} | {'d', atom(), term()}.
 
--type err_info() :: erl_scan:error_info(). %% ErrorDescriptor
+-type err_info() :: {erl_scan:line(), module(), term()}. %% ErrorDescriptor
 -type errors()   :: [{file:filename(), [err_info()]}].
 -type warnings() :: [{file:filename(), [err_info()]}].
 -type mod_ret()  :: {'ok', module()}
@@ -363,17 +363,7 @@ messages_per_file(Ms) ->
                                                   (_) -> false
                                                end, A)
                        end, T, PrioMs),
-    Prio = lists:sort(fun({_,{As1,_,_}}, {_,{As2,_,_}}) ->
-                              {location, Loc1} =
-                                  erl_scan:attributes_info(As1, location),
-                              {location, Loc2} =
-                                  erl_scan:attributes_info(As2, location),
-                              case {Loc1, Loc2} of
-                                  {{L1, _}, L2} when is_integer(L2) -> L1 < L2;
-                                  {L1, {L2, _}} when is_integer(L1) -> L1 =< L2;
-                                  {_, _} -> Loc1 =< Loc2
-                              end
-                      end,
+    Prio = lists:sort(fun({_,{L1,_,_}}, {_,{L2,_,_}}) -> L1 =< L2 end,
                       lists:append(Prio0)),
     flatmap(fun mpf/1, [Prio, Rest]).
 
@@ -783,8 +773,7 @@ parse_module(St) ->
     Opts = St#compile.options,
     Cwd = ".",
     IncludePath = [Cwd, St#compile.dir|inc_paths(Opts)],
-    AtPos = initial_position(Opts),
-    R =  epp:parse_file(St#compile.ifile, AtPos, IncludePath, pre_defs(Opts)),
+    R =  epp:parse_file(St#compile.ifile, IncludePath, pre_defs(Opts)),
     case R of
 	{ok,Forms} ->
 	    {ok,St#compile{code=Forms}};
@@ -1434,7 +1423,7 @@ report_warnings(#compile{options=Opts,warnings=Ws0}) ->
     end.
 
 format_message(F, P, [{{Line,Column}=Loc,Mod,E}|Es]) ->
-    M = {{F,Loc},io_lib:format("~s:~w:~w: ~s~s\n",
+    M = {{F,Loc},io_lib:format("~s:~w:~w ~s~s\n",
                                 [F,Line,Column,P,Mod:format_error(E)])},
     [M|format_message(F, P, Es)];
 format_message(F, P, [{Line,Mod,E}|Es]) ->
@@ -1490,12 +1479,6 @@ objfile(Base, St) ->
 tmpfile(Ofile) ->
     reverse([$#|tl(reverse(Ofile))]).
 
-initial_position(Opts) ->
-    case lists:member(column, Opts) of
-        true -> {1, 1};
-        false -> 1
-    end.
-
 %% pre_defs(Options)
 %% inc_paths(Options)
 %%  Extract the predefined macros and include paths from the option list.
diff --git a/lib/compiler/src/v3_core.erl b/lib/compiler/src/v3_core.erl
index 242196c593..01042cc56f 100644
--- a/lib/compiler/src/v3_core.erl
+++ b/lib/compiler/src/v3_core.erl
@@ -823,6 +823,13 @@ bitstr({bin_element,_,E0,Size0,[Type,{unit,Unit}|Flags]}, St0) ->
 	{_,_} ->
 	    throw(bad_binary)
     end,
+    case Size1 of
+	#c_var{} -> ok;
+	#c_literal{val=Sz} when is_integer(Sz), Sz >= 0 -> ok;
+	#c_literal{val=undefined} -> ok;
+	#c_literal{val=all} -> ok;
+	_ -> throw(bad_binary)
+    end,
     {#c_bitstr{val=E1,size=Size1,
 	       unit=#c_literal{val=Unit},
 	       type=#c_literal{val=Type},
diff --git a/lib/compiler/src/v3_kernel.erl b/lib/compiler/src/v3_kernel.erl
index c4e7b45aac..b184987625 100644
--- a/lib/compiler/src/v3_kernel.erl
+++ b/lib/compiler/src/v3_kernel.erl
@@ -278,11 +278,12 @@ expr(#c_binary{anno=A,segments=Cv}, Sub, St0) ->
 	    {#k_binary{anno=A,segs=Kv},Ep,St1}
     catch
 	throw:bad_element_size ->
+	    St1 = add_warning(get_line(A), bad_segment_size, A, St0),
 	    Erl = #c_literal{val=erlang},
 	    Name = #c_literal{val=error},
 	    Args = [#c_literal{val=badarg}],
 	    Error = #c_call{anno=A,module=Erl,name=Name,args=Args},
-	    expr(Error, Sub, St0)
+	    expr(Error, Sub, St1)
     end;
 expr(#c_fun{anno=A,vars=Cvs,body=Cb}, Sub0, #kern{ff=OldFF,func=Func}=St0) ->
     FA = case OldFF of
@@ -1827,7 +1828,9 @@ format_error({nomatch_shadow,Line}) ->
 format_error(nomatch_shadow) ->
     "this clause cannot match because a previous clause always matches";
 format_error(bad_call) ->
-    "invalid module and/or function name; this call will always fail".
+    "invalid module and/or function name; this call will always fail";
+format_error(bad_segment_size) ->
+    "binary construction will fail because of a type mismatch".
 
 add_warning(none, Term, Anno, #kern{ws=Ws}=St) ->
     File = get_file(Anno),
diff --git a/lib/compiler/test/bs_construct_SUITE.erl b/lib/compiler/test/bs_construct_SUITE.erl
index 31c7890f26..e8b30f44ce 100644
--- a/lib/compiler/test/bs_construct_SUITE.erl
+++ b/lib/compiler/test/bs_construct_SUITE.erl
@@ -468,6 +468,10 @@ opt(Config) when is_list(Config) ->
     ?line {'EXIT',_} = (catch <<<<23,56,0,2>>:64/float>>),
     ?line {'EXIT',_} = (catch <<<<23,56,0,2:7>>/binary>>),
 
+    %% Test constant propagation - there should be a warning.
+    BadSz = 2.5,
+    {'EXIT',_} = (catch <<<<N,56,0,2>>:BadSz/binary>>),
+
     case id(false) of
 	true -> ?line opt_dont_call_me();
 	false -> ok
diff --git a/lib/compiler/test/error_SUITE.erl b/lib/compiler/test/error_SUITE.erl
index 47698ecdb7..eb5e50818e 100644
--- a/lib/compiler/test/error_SUITE.erl
+++ b/lib/compiler/test/error_SUITE.erl
@@ -22,15 +22,13 @@
 
 -export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, 
 	 init_per_group/2,end_per_group/2,
-	 head_mismatch_line/1,warnings_as_errors/1, bif_clashes/1,
-	 column_number/1
-   ]).
+	 head_mismatch_line/1,warnings_as_errors/1, bif_clashes/1]).
 
 suite() -> [{ct_hooks,[ts_install_cth]}].
 
 all() -> 
     test_lib:recompile(?MODULE),
-    [head_mismatch_line, warnings_as_errors, bif_clashes, column_number].
+    [head_mismatch_line, warnings_as_errors, bif_clashes].
 
 groups() -> 
     [].
@@ -168,15 +166,6 @@ bif_clashes(Config) when is_list(Config) ->
 
 
 
-%% Tests that messages are correctly reported with column numbers
-%% if the column option is set.
-column_number(Config) when is_list(Config) ->
-    Ts1 = [{column_number_warning,
-	   <<"\nt(X) -> ok.">>,
-	   [return_warnings, export_all, column],
-	   {warning, [{{2, 3}, erl_lint, {unused_var, 'X'}}]}}],
-    ?line [] = run(Config, Ts1),
-    ok.
 
 %% Tests that a head mismatch is reported on the correct line (OTP-2125).
 head_mismatch_line(Config) when is_list(Config) ->
diff --git a/lib/stdlib/doc/src/epp.xml b/lib/stdlib/doc/src/epp.xml
index a57c7084fa..488499581f 100644
--- a/lib/stdlib/doc/src/epp.xml
+++ b/lib/stdlib/doc/src/epp.xml
@@ -51,7 +51,6 @@
     <func>
       <name name="open" arity="2"/>
       <name name="open" arity="3"/>
-      <name name="open" arity="4"/>
       <fsummary>Open a file for preprocessing</fsummary>
       <desc>
         <p>Opens a file for preprocessing.</p>
@@ -76,7 +75,6 @@
     </func>
     <func>
       <name name="parse_file" arity="3"/>
-      <name name="parse_file" arity="4"/>
       <fsummary>Preprocess and parse an Erlang source file</fsummary>
       <desc>
         <p>Preprocesses and parses an Erlang source file.
diff --git a/lib/stdlib/src/epp.erl b/lib/stdlib/src/epp.erl
index d958b0af2a..ccc14610d7 100644
--- a/lib/stdlib/src/epp.erl
+++ b/lib/stdlib/src/epp.erl
@@ -20,9 +20,9 @@
 
 %% An Erlang code preprocessor.
 
--export([open/2,open/3,open/4, open/5,close/1,format_error/1]).
+-export([open/2,open/3,open/5,close/1,format_error/1]).
 -export([scan_erl_form/1,parse_erl_form/1,macro_defs/1]).
--export([parse_file/1, parse_file/3, parse_file/4]).
+-export([parse_file/1, parse_file/3]).
 -export([interpret_file_attribute/1]).
 -export([normalize_typed_record_fields/1,restore_typed_record_fields/1]).
 
@@ -54,14 +54,12 @@
 
 %% open(FileName, IncludePath)
 %% open(FileName, IncludePath, PreDefMacros)
-%% open(FileName, StartLocation, IncludePath, PredefMacros)
 %% open(FileName, IoDevice, StartLocation, IncludePath, PreDefMacros)
 %% close(Epp)
 %% scan_erl_form(Epp)
 %% parse_erl_form(Epp)
 %% parse_file(Epp)
 %% parse_file(FileName, IncludePath, PreDefMacros)
-%% parse_file(FileName, StartLocation, IncludePath, PreDefMacros)
 %% macro_defs(Epp)
 
 -spec open(FileName, IncludePath) ->
@@ -83,20 +81,8 @@ open(Name, Path) ->
       ErrorDescriptor :: term().
 
 open(Name, Path, Pdm) ->
-    open(Name, 1, Path, Pdm).
-
--spec open(FileName, StartLocation, IncludePath, PredefMacros) ->
-	{'ok', Epp} | {'error', ErrorDescriptor} when
-      FileName :: file:name(),
-      StartLocation :: erl_scan:location(),
-      IncludePath :: [DirectoryName :: file:name()],
-      PredefMacros :: macros(),
-      Epp :: epp_handle(),
-      ErrorDescriptor :: term().
-
-open(Name, StartLocation, Path, Pdm) ->
     Self = self(),
-    Epp = spawn(fun() -> server(Self, Name, StartLocation, Path, Pdm) end),
+    Epp = spawn(fun() -> server(Self, Name, Path, Pdm) end),
     epp_request(Epp).
 
 open(Name, File, StartLocation, Path, Pdm) ->
@@ -192,21 +178,7 @@ format_error(E) -> file:format_error(E).
       OpenError :: file:posix() | badarg | system_limit.
 
 parse_file(Ifile, Path, Predefs) ->
-    parse_file(Ifile, 1, Path, Predefs).
-
--spec parse_file(FileName, StartLocation, IncludePath, PredefMacros) ->
-                {'ok', [Form]} | {error, OpenError} when
-      FileName :: file:name(),
-      StartLocation :: erl_scan:location(),
-      IncludePath :: [DirectoryName :: file:name()],
-      Form :: erl_parse:abstract_form() | {'error', ErrorInfo} | {'eof',Line},
-      PredefMacros :: macros(),
-      Line :: erl_scan:line(),
-      ErrorInfo :: erl_scan:error_info() | erl_parse:error_info(),
-      OpenError :: file:posix() | badarg | system_limit.
-
-parse_file(Ifile, StartLocation, Path, Predefs) ->
-    case open(Ifile, StartLocation, Path, Predefs) of
+    case open(Ifile, Path, Predefs) of
 	{ok,Epp} ->
 	    Forms = parse_file(Epp),
 	    close(Epp),
@@ -273,12 +245,14 @@ restore_typed_record_fields([{attribute,La,type,{{record,Record},Fields,[]}}|
 restore_typed_record_fields([Form|Forms]) ->
     [Form|restore_typed_record_fields(Forms)].
 
-%% server(StarterPid, FileName, Location, Path, PreDefMacros)
-server(Pid, Name, AtLocation, Path, Pdm) ->
+%% server(StarterPid, FileName, Path, PreDefMacros)
+
+server(Pid, Name, Path, Pdm) ->
     process_flag(trap_exit, true),
     case file:open(Name, [read]) of
 	{ok,File} ->
-	    init_server(Pid, Name, File, AtLocation, Path, Pdm, false);
+            Location = 1,
+	    init_server(Pid, Name, File, Location, Path, Pdm, false);
 	{error,E} ->
 	    epp_reply(Pid, {error,E})
     end.
diff --git a/lib/stdlib/src/erl_scan.erl b/lib/stdlib/src/erl_scan.erl
index be64b428b1..10b2ed2e49 100644
--- a/lib/stdlib/src/erl_scan.erl
+++ b/lib/stdlib/src/erl_scan.erl
@@ -55,7 +55,7 @@
          token_info/1,token_info/2,
          attributes_info/1,attributes_info/2,set_attribute/3]).
 
--export_type([error_info/0, line/0, location/0, tokens_result/0]).
+-export_type([error_info/0, line/0, tokens_result/0]).
 
 %%%
 %%% Defines and type definitions
diff --git a/lib/tools/src/xref_utils.erl b/lib/tools/src/xref_utils.erl
index 9d4a175d88..680563e9df 100644
--- a/lib/tools/src/xref_utils.erl
+++ b/lib/tools/src/xref_utils.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2000-2010. All Rights Reserved.
+%% Copyright Ericsson AB 2000-2012. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -141,7 +141,7 @@ is_string([], _) ->
 is_string(Term, C) ->
     is_string1(Term, C).
 
-is_string1([H | T], C) when H > C, H < 127 -> 
+is_string1([H | T], C) when H > C ->
     is_string1(T, C);
 is_string1([], _) -> 
     true;
diff --git a/lib/tools/test/xref_SUITE.erl b/lib/tools/test/xref_SUITE.erl
index 78e49044a5..fd3e111d8d 100644
--- a/lib/tools/test/xref_SUITE.erl
+++ b/lib/tools/test/xref_SUITE.erl
@@ -53,7 +53,7 @@
 	 analyze/1, basic/1, md/1, q/1, variables/1, unused_locals/1]).
 
 -export([
-	 format_error/1, otp_7423/1, otp_7831/1]).
+	 format_error/1, otp_7423/1, otp_7831/1, otp_10192/1]).
 
 -import(lists, [append/2, flatten/1, keysearch/3, member/2, sort/1, usort/1]).
 
@@ -86,7 +86,7 @@ groups() ->
        fun_mfa_r14, fun_mfa_vars, qlc]},
      {analyses, [],
       [analyze, basic, md, q, variables, unused_locals]},
-     {misc, [], [format_error, otp_7423, otp_7831]}].
+     {misc, [], [format_error, otp_7423, otp_7831, otp_10192]}].
 
 init_per_suite(Config) ->
     init(Config).
@@ -2515,6 +2515,18 @@ otp_7831(Conf) when is_list(Conf) ->
     ?line xref:stop(Pid2),
     ok.
 
+otp_10192(suite) -> [];
+otp_10192(doc) ->
+    ["OTP-10192. Allow filenames with character codes greater than 126."];
+otp_10192(Conf) when is_list(Conf) ->
+    PrivDir = ?privdir,
+    {ok, _Pid} = xref:start(s),
+    Dir = filename:join(PrivDir, "�"),
+    ok = file:make_dir(Dir),
+    {ok, []} = xref:add_directory(s, Dir),
+    xref:stop(s),
+    ok.
+
 %%%
 %%% Utilities
 %%%
diff --git a/xcomp/erl-xcomp-powerpc-dso-linux-gnu.conf b/xcomp/erl-xcomp-powerpc-dso-linux-gnu.conf
new file mode 100644
index 0000000000..735c986486
--- /dev/null
+++ b/xcomp/erl-xcomp-powerpc-dso-linux-gnu.conf
@@ -0,0 +1,258 @@
+## -*-shell-script-*-
+##
+## %CopyrightBegin%
+##
+## Copyright Ericsson AB 2009-2010. All Rights Reserved.
+##
+## The contents of this file are subject to the Erlang Public License,
+## Version 1.1, (the "License"); you may not use this file except in
+## compliance with the License. You should have received a copy of the
+## Erlang Public License along with this software. If not, it can be
+## retrieved online at http://www.erlang.org/.
+##
+## Software distributed under the License is distributed on an "AS IS"
+## basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+## the License for the specific language governing rights and limitations
+## under the License.
+##
+## %CopyrightEnd%
+##
+## File: erl-xcomp.conf.template
+## Author: Rickard Green
+##
+## -----------------------------------------------------------------------------
+## When cross compiling Erlang/OTP using `otp_build', copy this file and set
+## the variables needed below. Then pass the path to the copy of this file as
+## an argument to `otp_build' in the configure stage:
+##   `otp_build configure --xcomp-conf=<FILE>'
+## -----------------------------------------------------------------------------
+
+## Note that you cannot define arbitrary variables in a cross compilation
+## configuration file. Only the ones listed below will be guaranteed to be
+## visible throughout the whole execution of all `configure' scripts. Other
+## variables needs to be defined as arguments to `configure' or exported in
+## the environment.
+
+## -- Variables for `otp_build' Only -------------------------------------------
+
+## Variables in this section are only used, when configuring Erlang/OTP for
+## cross compilation using `$ERL_TOP/otp_build configure'.
+
+## *NOTE*! These variables currently have *no* effect if you configure using
+## the `configure' script directly.
+
+# * `erl_xcomp_build' - The build system used. This value will be passed as
+#   `--build=$erl_xcomp_build' argument to the `configure' script. It does
+#   not have to be a full `CPU-VENDOR-OS' triplet, but can be. The full
+#   `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_build'. If set to `guess',
+#   the build system will be guessed using
+#   `$ERL_TOP/erts/autoconf/config.guess'.
+erl_xcomp_build=guess
+
+# * `erl_xcomp_host' - Cross host/target system to build for. This value will
+#   be passed as `--host=$erl_xcomp_host' argument to the `configure' script.
+#   It does not have to be a full `CPU-VENDOR-OS' triplet, but can be. The
+#   full `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host'.
+erl_xcomp_host=powerpc-dso-linux-gnu
+
+# * `erl_xcomp_configure_flags' - Extra configure flags to pass to the
+#   `configure' script.
+erl_xcomp_configure_flags=--without-termcap
+
+## -- Cross Compiler and Other Tools -------------------------------------------
+
+## If the cross compilation tools are prefixed by `<HOST>-' you probably do
+## not need to set these variables (where `<HOST>' is what has been passed as
+## `--host=<HOST>' argument to `configure').
+
+## All variables in this section can also be used when native compiling.
+
+# * `CC' - C compiler.
+CC=powerpc-dso-linux-gnu-gcc
+
+# * `CFLAGS' - C compiler flags.
+#CFLAGS=
+
+# * `STATIC_CFLAGS' - Static C compiler flags.
+#STATIC_CFLAGS=
+
+# * `CFLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for the shared libraries. Note that this actually is a
+#   linker flag, but it needs to be passed via the compiler.
+#CFLAG_RUNTIME_LIBRARY_PATH=
+
+# * `CPP' - C pre-processor.
+#CPP=
+
+# * `CPPFLAGS' - C pre-processor flags.
+#CPPFLAGS=
+
+# * `CXX' - C++ compiler.
+CXX=powerpc-dso-linux-gnu-g++
+
+# * `CXXFLAGS' - C++ compiler flags.
+#CXXFLAGS=
+
+# * `LD' - Linker.
+LD=powerpc-dso-linux-gnu-ld
+
+# * `LDFLAGS' - Linker flags.
+#LDFLAGS=
+
+# * `LIBS' - Libraries.
+#LIBS=
+
+## -- *D*ynamic *E*rlang *D*river Linking --
+
+## *NOTE*! Either set all or none of the `DED_LD*' variables.
+
+# * `DED_LD' - Linker for Dynamically loaded Erlang Drivers.
+#DED_LD=
+
+# * `DED_LDFLAGS' - Linker flags to use with `DED_LD'.
+#DED_LDFLAGS=
+
+# * `DED_LD_FLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for shared libraries when linking with `DED_LD'.
+#DED_LD_FLAG_RUNTIME_LIBRARY_PATH=
+
+## -- Large File Support --
+
+## *NOTE*! Either set all or none of the `LFS_*' variables.
+
+# * `LFS_CFLAGS' - Large file support C compiler flags.
+#LFS_CFLAGS=
+
+# * `LFS_LDFLAGS' - Large file support linker flags.
+#LFS_LDFLAGS=
+
+# * `LFS_LIBS' - Large file support libraries.
+#LFS_LIBS=
+
+## -- Other Tools --
+
+# * `RANLIB' - `ranlib' archive index tool.
+RANLIB=powerpc-dso-linux-gnu-ranlib
+
+# * `AR' - `ar' archiving tool.
+AR=powerpc-dso-linux-gnu-ar
+
+# * `GETCONF' - `getconf' system configuration inspection tool. `getconf' is
+#   currently used for finding out large file support flags to use, and
+#   on Linux systems for finding out if we have an NPTL thread library or
+#   not.
+#GETCONF=
+
+## -- Cross System Root Locations ----------------------------------------------
+
+# * `erl_xcomp_sysroot' - The absolute path to the system root of the cross
+#   compilation environment. Currently, the `crypto', `odbc', `ssh' and
+#   `ssl' applications need the system root. These applications will be
+#   skipped if the system root has not been set. The system root might be
+#   needed for other things too. If this is the case and the system root
+#   has not been set, `configure' will fail and request you to set it.
+erl_xcomp_sysroot="$DSO_SYSROOT_POWERPC"
+
+# * `erl_xcomp_isysroot' - The absolute path to the system root for includes
+#   of the cross compilation environment. If not set, this value defaults
+#   to `$erl_xcomp_sysroot', i.e., only set this value if the include system
+#   root path is not the same as the system root path.
+#erl_xcomp_isysroot=
+
+## -- Optional Feature, and Bug Tests ------------------------------------------
+
+## These tests cannot (always) be done automatically when cross compiling. You
+## usually do not need to set these variables. Only set these if you really
+## know what you are doing.
+
+## Note that some of these values will override results of tests performed
+## by `configure', and some will not be used until `configure' is sure that
+## it cannot figure the result out.
+
+## The `configure' script will issue a warning when a default value is used.
+## When a variable has been set, no warning will be issued.
+
+# * `erl_xcomp_after_morecore_hook' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `__after_morecore_hook' that can be
+#   used for tracking used `malloc()' implementations core memory usage.
+#   This is currently only used by unsupported features.
+erl_xcomp_after_morecore_hook=yes
+
+# * `erl_xcomp_bigendian' - `yes|no'. No default. If `yes', the target system
+#   must be big endian. If `no', little endian. This can often be
+#   automatically detected, but not always. If not automatically detected,
+#   `configure' will fail unless this variable is set. Since no default
+#   value is used, `configure' will try to figure this out automatically.
+#erl_xcomp_bigendian=
+
+# * `erl_xcomp_clock_gettime_cpu_time' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `clock_gettime()' implementation
+#   that can be used for retrieving process CPU time.
+#erl_xcomp_clock_gettime_cpu_time=
+
+# * `erl_xcomp_getaddrinfo' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `getaddrinfo()' implementation that can
+#   handle both IPv4 and IPv6.
+erl_xcomp_getaddrinfo=yes
+
+# * `erl_xcomp_gethrvtime_procfs_ioctl' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `gethrvtime()' implementation and
+#   is used with procfs `ioctl()'.
+#erl_xcomp_gethrvtime_procfs_ioctl=
+
+# * `erl_xcomp_dlsym_brk_wrappers' - `yes|no'. Defaults to `no'. If `yes', the
+#   target system must have a working `dlsym(RTLD_NEXT, <S>)' implementation
+#   that can be used on `brk' and `sbrk' symbols used by the `malloc()'
+#   implementation in use, and by this track the `malloc()' implementations
+#   core memory usage. This is currently only used by unsupported features.
+#erl_xcomp_dlsym_brk_wrappers=
+
+# * `erl_xcomp_kqueue' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `kqueue()' implementation that returns a file
+#   descriptor which can be used by `poll()' and/or `select()'. If `no' and
+#   the target system has not got `epoll()' or `/dev/poll', the kernel-poll
+#   feature will be disabled.
+#erl_xcomp_kqueue=
+
+# * `erl_xcomp_linux_clock_gettime_correction' - `yes|no'. Defaults to `yes' on
+#   Linux; otherwise, `no'. If `yes', `clock_gettime(CLOCK_MONOTONIC, _)' on
+#   the target system must work. This variable is recommended to be set to
+#   `no' on Linux systems with kernel versions less than 2.6.
+#erl_xcomp_linux_clock_gettime_correction=
+
+# * `erl_xcomp_linux_nptl' - `yes|no'. Defaults to `yes' on Linux; otherwise,
+#   `no'. If `yes', the target system must have NPTL (Native POSIX Thread
+#   Library). Older Linux systems have LinuxThreads instead of NPTL (Linux
+#   kernel versions typically less than 2.6).
+#erl_xcomp_linux_nptl=
+
+# * `erl_xcomp_linux_usable_sigaltstack' - `yes|no'. Defaults to `yes' on Linux;
+#   otherwise, `no'. If `yes', `sigaltstack()' must be usable on the target
+#   system. `sigaltstack()' on Linux kernel versions less than 2.4 are
+#   broken.
+#erl_xcomp_linux_usable_sigaltstack=
+
+# * `erl_xcomp_linux_usable_sigusrx' - `yes|no'. Defaults to `yes'. If `yes',
+#   the `SIGUSR1' and `SIGUSR2' signals must be usable by the ERTS. Old
+#   LinuxThreads thread libraries (Linux kernel versions typically less than
+#   2.2) used these signals and made them unusable by the ERTS.
+#erl_xcomp_linux_usable_sigusrx=
+
+# * `erl_xcomp_poll' - `yes|no'. Defaults to `no' on Darwin/MacOSX; otherwise,
+#   `yes'. If `yes', the target system must have a working `poll()'
+#   implementation that also can handle devices. If `no', `select()' will be
+#   used instead of `poll()'.
+#erl_xcomp_poll=
+
+# * `erl_xcomp_putenv_copy' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a `putenv()' implementation that stores a copy of the
+#   key/value pair.
+#erl_xcomp_putenv_copy=
+
+# * `erl_xcomp_reliable_fpe' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have reliable floating point exceptions.
+#erl_xcomp_reliable_fpe=
+
+## -----------------------------------------------------------------------------