Just tried with new build system in OpenJDK (jdk8 master forest) on Windows, now there is no pain as it was with the old build. Just start the build and relax....
If any one interested to try out just check this link "http://openjdk.java.net/projects/build-infra/guide.html"
PS: if you end up with "Defs-utils.gmk: No such file or directory", just go and create a dummy file named "Defs-utils.gmk" in "jdk/makefiles/common/shared"
