support phony targets - close #25

spec/build_tests_spec.rb

@@ -932,4 +932,35 @@ EOF
     end
   end
 
+  context "phony targets" do
+    it "allows specifying a Symbol as a target name and reruns the builder if the sources or command have changed" do
+      test_dir("simple")
+      env = Rscons::Environment.new do |env|
+        env.add_builder(:Checker) do |target, sources, cache, env, vars|
+          unless cache.up_to_date?(target, :Checker, sources, env)
+            puts "Checker #{sources.first}" if env.echo != :off
+            cache.register_build(target, :Checker, sources, env)
+          end
+          target
+        end
+        env.Program("simple.exe", "simple.c")
+        env.Checker(:checker, "simple.exe")
+      end
+      expect(lines).to eq(["CC simple.o", "LD simple.exe", "Checker simple.exe"])
+
+      env.clone do |env|
+        env.Checker(:checker, "simple.exe")
+      end
+      expect(lines).to eq([])
+
+      File.open("simple.exe", "w") do |fh|
+        fh.puts "Changed simple.exe"
+      end
+      env.clone do |env|
+        env.Checker(:checker, "simple.exe")
+      end
+      expect(lines).to eq(["Checker simple.exe"])
+    end
+  end
+
 end