OpenJ9 Build Scripts

A set of scripts to simplify configuration and compilation of OpenJ9 (non only) for RISC-V on Debian.

These scripts were created solely for my personal needs while working on OpenJ9 on RISC-V and mainly as an executable documentation. By no means they're meant to be used for any kind of production. Use with caution!

Usage

1. To checkout code:

   ./prepare.sh
   

   This checks out OpenJDK, OpenJ and OMR and also downloads and unpacks freemarker. Source is checked out into openj9-openjdk-jdk11 directory

2. Apply some out-of-tree patches:

   ./patch.sh
   

   Some of the patches are necessary - at the time of writing - to compile OpenJ9 with GCC 10 (the GCC used on Debian for RISC-V). Some other ease debugging.

3. Configure build:

   ./configure.sh --target riscv64-linux-gnu
   

   By default, this configures build for debugging, i.e, with debug info and no optimization (-O0). You may specify --release option configure for a "release" build.

   Cross-compilation is only supported (so far) for RISC-V target on x86_64 hosts

4. Compile:

   ./compile.sh --target riscv64-linux-gnu
   

   You must specify the same --target as when configuring. If you specified --release when configuring, you must pass it to compile.sh too. (this annoyance may be fixed later)