After some problems with the architecture define in OpenJDK's build system, today I got the stuff built. At least the ECJ-poured one:
$ uname -m alpha $ openjdk-ecj/build/linux-alpha/bin/java -version java version "1.7.0" IcedTea Runtime Environment (build 1.7.0-b24) CACAO (build 0.98+svn, JIT mode) $ openjdk-ecj/build/linux-alpha/bin/java -cp ~/cacao/ HelloWorld Hello World!
Let's see if I get the whole stuff built...