From 775363ddbd6b4e2f2784493b2ec897c824c62f71 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 11 Jul 2017 10:29:25 -0400
Subject: [PATCH] cloned Environments should inherit n_threads - close #42

---
 build_tests/simple/clone_n_threads.rb | 7 +++++++
 lib/rscons/environment.rb             | 1 +
 spec/build_tests_spec.rb              | 7 +++++++
 3 files changed, 15 insertions(+)
 create mode 100644 build_tests/simple/clone_n_threads.rb

diff --git a/build_tests/simple/clone_n_threads.rb b/build_tests/simple/clone_n_threads.rb
new file mode 100644
index 0000000..ec422cb
--- /dev/null
+++ b/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
diff --git a/lib/rscons/environment.rb b/lib/rscons/environment.rb
index 6fef4c4..3df43ad 100644
--- a/lib/rscons/environment.rb
+++ b/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
diff --git a/spec/build_tests_spec.rb b/spec/build_tests_spec.rb
index 0f80eb7..e3372de 100644
--- a/spec/build_tests_spec.rb
+++ b/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")