Require Elixir 1.6.6+, adding support for Elixir 1.7.x at the same time

lib/rabbitmq/cli/core/parser.ex

@@ -141,7 +141,12 @@ defmodule RabbitMQ.CLI.Core.Parser do
     switches = default_switches()
     aliases = default_aliases()
     {options, tail, invalid} =
-      OptionParser.parse_head(input, strict: switches, aliases: aliases)
+      OptionParser.parse_head(
+        input,
+        strict: switches,
+        aliases: aliases,
+        allow_nonexistent_atoms: true,
+      )
     norm_options = normalize_options(options, switches) |> Map.new
     {norm_options, tail, invalid}
   end
@@ -156,7 +161,8 @@ defmodule RabbitMQ.CLI.Core.Parser do
     {options, args, invalid} = OptionParser.parse(
       input,
       strict: switches,
-      aliases: aliases
+      aliases: aliases,
+      allow_nonexistent_atoms: true,
     )
     norm_options = normalize_options(options, switches) |> Map.new
     {args, norm_options, invalid}

mix.exs

@@ -20,7 +20,7 @@ defmodule RabbitMQCtl.MixfileBase do
     [
       app: :rabbitmqctl,
       version: "3.8.0-dev",
-      elixir: "~> 1.6.0",
+      elixir: ">= 1.6.6 and < 1.8.0",
       build_embedded: Mix.env == :prod,
       start_permanent: Mix.env == :prod,
       escript: [main_module: RabbitMQCtl,