cloned Environments should inherit n_threads - close #42

build_tests/simple/clone_n_threads.rb

@@ -0,0 +1,7 @@
+base_env = Rscons::Environment.new do |env|
+  env.n_threads = 165
+end
+
+my_env = base_env.clone
+
+puts my_env.n_threads

lib/rscons/environment.rb

@@ -118,6 +118,7 @@ module Rscons
           env.add_post_build_hook(&build_hook_block)
         end
       end
+      env.instance_variable_set(:@n_threads, @n_threads)
 
       if block_given?
         yield env

spec/build_tests_spec.rb

@@ -762,6 +762,13 @@ EOF
     expect(result.stderr).to match /Failed to build foo_4/
   end
 
+  it "clones n_threads attribute when cloning an Environment" do
+    test_dir("simple")
+    result = run_test(rsconsfile: "clone_n_threads.rb")
+    expect(result.stderr).to eq ""
+    expect(lines(result.stdout)).to eq ["165"]
+  end
+
   context "backward compatibility" do
     it "allows a builder to call Environment#run_builder in a non-threaded manner" do
       test_dir("simple")