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Re:Lilith: x86-64 OS written in Crystal by imhoguy on Monday December 23, 2019 @03:08AM (#21862174)
You can use Kotlin/Native [0] or just plain Kotlin over Java with GraalVM which produces compact binaries.

[0] https://kotlinlang.org/docs/reference/native-overview.html

Re:Lilith: x86-64 OS written in Crystal by vips7L on Monday December 23, 2019 @08:20AM (#21863408)
Kotlin/native's stdlib isn't feature complete. You have to use raw syscalls to do anything.