allow passing Builder objects as sources to build targets - close #95

build_tests/simple/builder_as_source.rb

@@ -0,0 +1,6 @@
+build do
+  Environment.new do |env|
+    object = env.Object("simple.o", "simple.c")
+    env.Program("simple.exe", object)
+  end
+end

lib/rscons/environment.rb

@@ -310,6 +310,7 @@ module Rscons
         end
         target = expand_path(expand_varref(target))
         sources = Array(sources).map do |source|
+          source = source.target if sources.is_a?(Builder)
           expand_path(expand_varref(source))
         end.flatten
         builder = @builders[method.to_s].new(

spec/build_tests_spec.rb

@@ -173,6 +173,14 @@ EOF
     expect(`./simple.exe`).to eq "This is a simple C program\n"
   end
 
+  it "allows specifying a Builder object as the source to another build target" do
+    test_dir("simple")
+    result = run_rscons(rsconscript: "builder_as_source.rb")
+    expect(result.stderr).to eq ""
+    expect(File.exists?("simple.o")).to be_truthy
+    expect(`./simple.exe`).to eq "This is a simple C program\n"
+  end
+
   it 'prints commands as they are executed' do
     test_dir('simple')
     result = run_rscons(rsconscript: "command.rb")