Support redirecting standard output using the Command builder - close #28

build_tests/simple/command_redirect.rb

@@ -0,0 +1,8 @@
+Rscons::Environment.new do |env|
+  env.Object("simple.o", "simple.c")
+  env.Command("simple.txt",
+              "simple.o",
+              "CMD" => %w[objdump --disassemble --source ${_SOURCES}],
+              "CMD_STDOUT" => "${_TARGET}",
+              "CMD_DESC" => "My Disassemble")
+end