;;;
;;; Java bootstrap toolchain.
;;;

;; The Java bootstrap begins with Jikes, a Java compiler written in C++.  We
;; use it to build a simple version of GNU Classpath, the Java standard
;; library.  We chose version 0.93 because it is the last version that can be
;; built with Jikes.  With Jikes and this version of GNU Classpath we can
;; build JamVM, a Java Virtual Machine.  We build version 1.5.1 because it is
;; the last version of JamVM that works with a version of GNU classpath that
;; does not require ECJ.  These three packages make up the bootstrap JDK.

;; This is sufficient to build an older version of Ant, which is needed to
;; build an older version of ECJ, an incremental Java compiler, both of which
;; are written in Java.
;;
;; ECJ is needed to build the latest release (0.99) and the development
;; version of GNU Classpath.  The development version of GNU Classpath has
;; much more support for Java 1.6 than the latest release, but we need to
;; build 0.99 first to get a working version of javah.  ECJ, the development
;; version of GNU Classpath, and the latest version of JamVM make up the
;; second stage JDK with which we can build the OpenJDK with the Icedtea 2.x
;; build framework.  We then build the more recent JDK Icedtea 3.x, and all
;; other versions of OpenJDK.