Call C from Clojure using GraalVM - then compile a binary using native-image

clojure calling c -- compiled to a binary with native-image

Prerequisites

• graalvm -- tested with graalvm-ce-java11-20.2.0-dev : https://github.com/graalvm/graalvm-ce-dev-builds/releases

  export GRAALVM_HOME = "/path/to/graalvm-ce-java11-20.2.0-dev/Contents/Home/"
  export JAVA_HOME = $GRAALVM_HOME
  

• install native-image: $GRAALVM_HOME/bin/gu install native-image (will be installed by ./compile otherwise)
• leiningen -- https://leiningen.org/

I've only tested on mac.

Steps

Modify src/Headers.java , specifically: /Users/test/programmering/clojure/graal-native-interaction/graal/src/triple.h needs to point to your src/triple.h .

$ make clean CFiles && ./compile && ./woop
1 # this value comes from a c-struct!

Acknowledgements

• Java code from: https://github.com/cornerwings/graal-native-interaction
• Project setup for clojure / native compilation from: https://github.com/borkdude/clj-kondo

Thanks sogaiu for helping me get this working. :)