Merge pull request #1610 from ferd/fix-relx-overlaying

Fix ordering of overlays and overlay vars in Relx

1 files changed, 5 insertions, 1 deletions

diff --git a/src/rebar_opts.erl b/src/rebar_opts.erl
index 8863b4c..b7156b2 100644
--- a/src/rebar_opts.erl
+++ b/src/rebar_opts.erl
@@ -132,7 +132,11 @@ merge_opt(mib_first_files, Value, Value) ->
 merge_opt(mib_first_files, NewValue, OldValue) ->
     OldValue ++ NewValue;
 merge_opt(relx, NewValue, OldValue) ->
-    rebar_utils:tup_umerge(OldValue, NewValue);
+    Partition = fun(C) -> is_tuple(C) andalso element(1, C) =:= overlay end,
+    {NewOverlays, NewOther} = lists:partition(Partition, NewValue),
+    {OldOverlays, OldOther} = lists:partition(Partition, OldValue),
+    rebar_utils:tup_umerge(NewOverlays, OldOverlays)
+    ++ rebar_utils:tup_umerge(OldOther, NewOther);
 merge_opt(Key, NewValue, OldValue)
     when Key == erl_opts; Key == eunit_compile_opts; Key == ct_compile_opts ->
     merge_erl_opts(lists:reverse(OldValue), NewValue);