How do I get jextract to build on a Macbook air M2 with latest OS

Question

I want to. test the Panama project added APIs and the jextract generator for such on a macbook air M2. There don't seem to be any arm64 prebuilt binaries for jextract.

I have zulu jdk 20 installed, cmake, python3, xCode, xCode command line tools, and the latest gradle ( should be enough to run a gradlew which caches the version it wants )

I cloned jextract from

https://github.com/openjdk/jextract.git

JAVA_HOME is set to /Library/Java/JavaVirtualMachines/zulu-20.jdk/Contents/Home

followed the instructions in the README.md It specifies I should do:

sh ./gradlew -Pjdk20_home=<jdk20_home_dir> -Pllvm_home=<libclang_dir> clean verify

Which led to issuing this command to build it.

./gradlew -Pjdk20_home=/Library/Java/JavaVirtualMachines/zulu-20.jdk/Contents/Home -Pllvm_home=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/ clean verify

Building results in this error from javac from gradle:

> Task :compileJava FAILED
error: release version 20 not supported
Usage: javac <options> <source files>
use --help for a list of possible options

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed with exit code 2; see the compiler error output for details.

I have also tried the other llvm paths they suggest. And have also tried older zulu-17 JDK and each time deleted gradle caches, the build folder and re-extracted the source (git reset --hard) from git.

I have searched for a solution for this. I also have searched for a forum on Panama and.or jextract to help me find a solution or any information on building for an apple M1/M2 and have not found anything.

Thanks !

Answer 1

To run the jextract build, you must have both Java 17 and the target Java version (Java 20 in your case). The actual build is done with Java 17.

Set JAVA_HOME to point to Java 17:

export JAVA_HOME=`/usr/libexec/java_home -v 17`
java -version

Then run the build command:

sh ./gradlew -Pjdk20_home=/Users/user/Documents/zulu20.32.11_1-ca-jdk20.0.2-macosx_aarch64 -Pllvm_home=/Library/Developer/CommandLineTools/usr/ clean verify