"Zero is a port of OpenJDK that uses no assembler and therefore can trivially be built on any system." https://openjdk.java.net/projects/zero/ The idea here is to potentially have an illumos port of zero. It's not so interesting on x86, for which we have a proper port anyway, but if we can get zero to work on x86 then it should be possible to get it to work on sparc too. It still needs the basic solaris patchset. It's designed more to support new hardware architectures (hence the zero assembler) than as a way to do an OS port. There are 2 patches: illumos-zero-1.patch Fixes src/hotspot/cpu/zero/stubGenerator_zero.cpp illumos-zero-2.patch Adds the src/hotspot/os_cpu/solaris_zero directory and contents These are current and tested for jdk18u 18.0.2.1. They don't provide a proper zero port, as they still have x86 assembler that needs to be removed. The two patches above are now applied by default, so we at least catch any source incompatibilities early. Configure: env PATH=/usr/bin:/usr/sbin:/usr/sfw/bin:/usr/gnu/bin bash ./configure \ --enable-unlimited-crypto --with-boot-jdk=/usr/jdk/instances/jdk17 \ --with-native-debug-symbols=none \ --with-toolchain-type=gcc \ --disable-dtrace \ --disable-warnings-as-errors \ --enable-deprecated-ports=yes \ --enable-jvm-feature-zero --with-jvm-variants=zero \ --with-jobs=3 build: env PATH=/usr/bin:/usr/sbin:/usr/sfw/bin:/usr/gnu/bin gmake all CONF=solaris-x86_64-zero-release