add Rscons::BuildTarget

Return a BuildTarget object from Environment#method_missing when a build target is registered.

spec/rscons/builders/program_spec.rb

@@ -5,13 +5,13 @@ module Rscons
       subject {Program.new}
 
       it "supports overriding CC construction variable" do
-        subject.should_receive(:standard_build).with("LD prog#{env["PROGSUFFIX"]}", "prog#{env["PROGSUFFIX"]}", ["sp-c++", "-o", "prog#{env["PROGSUFFIX"]}", "prog.o"], ["prog.o"], env, :cache)
+        subject.should_receive(:standard_build).with("LD prog", "prog", ["sp-c++", "-o", "prog", "prog.o"], ["prog.o"], env, :cache)
         subject.run("prog", ["prog.o"], :cache, env, "CC" => "sp-c++")
       end
 
       it "supports overriding LDCMD construction variable" do
         subject.should_receive(:standard_build).with("LD prog.exe", "prog.exe", ["special", "LD!", "prog.o"], ["prog.o"], env, :cache)
-        subject.run("prog", ["prog.o"], :cache, env, "LDCMD" => ["special", "LD!", "${_SOURCES}"])
+        subject.run("prog.exe", ["prog.o"], :cache, env, "LDCMD" => ["special", "LD!", "${_SOURCES}"])
       end
     end
   end

spec/rscons/environment_spec.rb

@@ -295,11 +295,11 @@ module Rscons
       it "records the target when the target method is a known builder" do
         env = Environment.new
         env.instance_variable_get(:@targets).should == {}
-        env.Program("target", ["src1", "src2"], var: "val")
-        target = env.instance_variable_get(:@targets)["target"]
+        env.Object("target.o", ["src1.c", "src2.c"], var: "val")
+        target = env.instance_variable_get(:@targets)["target.o"]
         target.should_not be_nil
         target[:builder].is_a?(Builder).should be_true
-        target[:sources].should == ["src1", "src2"]
+        target[:sources].should == ["src1.c", "src2.c"]
         target[:vars].should == {var: "val"}
         target[:args].should == []
       end