Support environment vars with unicode characters

The results returned by os:getenv() may contain unicode characters.
That said, we need to explicitly allow unicode when splitting the
environment information, otherwise badarg will be raised causing all
rebar commands to fail until the environment variable is removed.

src/rebar_port_compiler.erl

@@ -399,7 +399,7 @@ expand_vars_loop([], Recurse, Vars, Count) ->
     expand_vars_loop(Recurse, [], Vars, Count-1);
 expand_vars_loop([{K, V} | Rest], Recurse, Vars, Count) ->
     %% Identify the variables that need expansion in this value
-    ReOpts = [global, {capture, all_but_first, list}],
+    ReOpts = [global, {capture, all_but_first, list}, unicode],
     case re:run(V, "\\\${?(\\w+)}?", ReOpts) of
         {match, Matches} ->
             %% Identify the unique variables that need to be expanded
@@ -472,8 +472,8 @@ erts_dir() ->
     lists:concat([code:root_dir(), "/erts-", erlang:system_info(version)]).
 
 os_env() ->
-    Os = [list_to_tuple(re:split(S, "=", [{return, list}, {parts, 2}])) ||
-             S <- os:getenv()],
+    ReOpts = [{return, list}, {parts, 2}, unicode],
+     class="nv">Os  class="o">=  class="p">[ class="nb">list_to_tuple class="p">( class="nn">re:split(S, "=", ReOpts)) || S <- os:getenv()],
     %% Drop variables without a name (win32)
     [T1 || {K, _V} = T1 <- Os, K =/= []].