From b1c6c2fccfb24bb9294fdd09ba51adadca59fec1 Mon Sep 17 00:00:00 2001
From: James Fish <james@fishcakez.com>
Date: Tue, 2 Feb 2016 12:41:19 +0000
Subject: Ignore unknown warning when dialyzer < 2.8

---
 src/rebar_prv_dialyzer.erl | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/rebar_prv_dialyzer.erl b/src/rebar_prv_dialyzer.erl
index 2e5728a..834eb98 100644
--- a/src/rebar_prv_dialyzer.erl
+++ b/src/rebar_prv_dialyzer.erl
@@ -397,7 +397,7 @@ run_dialyzer(State, Opts, Output) ->
     case proplists:get_bool(get_warnings, Opts) of
         true ->
             WarningsList = get_config(State, warnings, []),
-            Opts2 = [{warnings, WarningsList},
+            Opts2 = [{warnings, legacy_warnings(WarningsList)},
                      {check_plt, false} |
                      Opts],
             ?DEBUG("Running dialyzer with options: ~p~n", [Opts2]),
@@ -412,6 +412,14 @@ run_dialyzer(State, Opts, Output) ->
             {0, State}
     end.
 
+legacy_warnings(Warnings) ->
+    case dialyzer_version() of
+       TupleVsn when TupleVsn < {2, 8, 0} ->
+            [Warning || Warning <- Warnings, Warning =/= unknown];
+        _ ->
+            Warnings
+    end.
+
 format_warnings(Output, Warnings) ->
     Warnings1 = rebar_dialyzer_format:format_warnings(Warnings),
     console_warnings(Warnings1),
@@ -475,3 +483,16 @@ collect_nested_dependent_apps(App, Seen) ->
                     end
             end
     end.
+
+dialyzer_version() ->
+    _ = application:load(dialyzer),
+    {ok, Vsn} = application:get_key(dialyzer, vsn),
+    case string:tokens(Vsn, ".") of
+        [Major, Minor] ->
+            version_tuple(Major, Minor, "0");
+        [Major, Minor, Patch | _] ->
+            version_tuple(Major, Minor, Patch)
+    end.
+
+version_tuple(Major, Minor, Patch) ->
+    {list_to_integer(Major), list_to_integer(Minor), list_to_integer(Patch)}.
-- 
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