https://github.com/v79/knworld

Kotlin Native for Pi
https://github.com/v79/knworld

Last synced: 6 days ago
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Kotlin Native for Pi

• Host: GitHub
• URL: https://github.com/v79/knworld
• Owner: v79
• Created: 2020-11-01T13:06:13.000Z (about 4 years ago)
• Default Branch: master
• Last Pushed: 2020-11-05T21:16:50.000Z (about 4 years ago)
• Last Synced: 2024-12-25T05:52:41.340Z (10 days ago)
• Language: Kotlin
• Size: 479 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# KNWorld - Experiments in Cross-Compilation

This is a test project for Kotlin Native. I've written a simple Kotlin program (inspired by the code at https://kotlinlang.org/docs/tutorials/native/using-intellij-idea.html) and modified it to work. My goal is to cross-compile from Windows to Raspberry Pi.

### Sources

I've duplicated the source code in `src\main\nativeMain` and `src\mainPiMain` - the only difference is the output, which states whether the compilation was from `native` or `pi`.

### Gradle

I've modified `build.gradle.kts` a little, as the examples on Kotlin's website did not work for me. I have added a new target called *Pi*, like this:

```kotlin

 linuxArm32Hfp("Pi") {

        binaries {

            executable {

                entryPoint = "main"

            }

        }

    }

```

### Compilation

To build the 'native' binary (i.e. an executable for the machine you are currently running), just run `gradle nativeBinaries`.

To build for the Raspberry Pi, execute `gradle PiBinaries`.

The resulting executable file called 'KNWorld.kexe' can be found in `build\bin\native\releaseExecutable` and `build\bin\Pi\releaseExecutable`.

Copy the Pi version of KNWorld.kexe to your Raspberry Pi. I've even added extra steps to verify this is a Linux binary build from my host - Windows - machine.

```shell script

pi@raspberrypi:~/PiShare $ uname -a

Linux raspberrypi 5.4.72-v7l+ #1356 SMP Thu Oct 22 13:57:51 BST 2020 armv7l GNU/Linux

pi@raspberrypi:~/PiShare $

pi@raspberrypi:~/PiShare $ file KNWorld.kexe

KNWorld.kexe: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3, for GNU/Linux 2.6.32, BuildID[xxHash]=a487af0917a9a720, not stripped

pi@raspberrypi:~/PiShare $ ./KNWorld.kexe

PiMain: Hello, enter your name:

Liam Davison

Your name contains 11 letters

Your name contains 9 unique letters

pi@raspberrypi:~/PiShare $

``` 

Voila, cross-compilation from MS Windows X64 to Raspbian ARM 32Hfp Pi code. No Windows Subsystem for Linux was used in this code.

The next step is to start integrating C libraries _from the Pi_ into the build process, but that's tearing my hair out and is, apparently, not possible from Windows.