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Graal native-image Building Setup on Windows (for Clojure Programs)
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graal-native-image-building-setup-on-windows.adoc

Graal native-image Building Setup on Windows (for Clojure Programs)

Background

A deps.edn-based approach is currently blocked because Graal’s native-image requires being run from a special command prompt that comes with Windows SDK 7.1, while the current clojure / clj tooling appears to require being launched via PowerShell.

A work-around using Leiningen and a .bat file (using a non-PowerShell command prompt), was determined by borkdude.

This document is mostly about Java 8 based GraalVMs. For Java 11 based GraalVMs, the process is considerably simpler:

choco install visualstudio2017community --version 15.9.17.0 --no-progress --package-parameters "--add Microsoft.VisualStudio.Component.VC.Tools.ARM64 --add Microsoft.VisualStudio.Component.VC.CMake.Project"

Requirements

  • Windows 7 or later (tested on 7 and 10)

  • Windows SDK 7.1

  • Graal 19 or later (leads to installation of native-image)

  • Leiningen

  • Some Clojure Project that’s amenable to native-image-building (e.g. clj-kondo)

Steps

1. Install Windows SDK 7.1

Installing Windows SDK 7.1 may be done via Chocolatey — the relevant command is: choco install windows-sdk-7.1. On Windows 10, an extra download and installation was required. This was unnecessary on Windows 7.

It may be that the following is enough (untested):

choco install -d windows-sdk-7.1 kb2519277

2. Install native-image

native-image is obtainable via Graal. From version 19, to make our lives interesting, after getting Graal, we are now required to run another command to get native-image :(

3. Install Leiningen

This can be done in a variety of ways. It appears doable via the Leiningen site, I was happy to do it via scoop.

4. Build Uberjar with Leiningen

In project.clj, be sure to choose :aot :all. Other things may be necessary, see clj-kondo’s project.clj.

5. Build via native-image

Use the -jar option to native-image, specifying the uberjar created in the previous step. Note that this native-image building needs to be performed via the Windows SDK 7.1 command prompt.

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