# Are custom sysimages cross-platform for the same Julia version?
**URL:** https://discourse.julialang.org/t/are-custom-sysimages-cross-platform-for-the-same-julia-version/46764
**Category:** New to Julia
**Tags:** question, package-compiler, sysimage
**Created:** [September 17, 2020, 9:09am UTC](https://discourse.julialang.org/t/are-custom-sysimages-cross-platform-for-the-same-julia-version/46764 "2020-09-17T09:09:52Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@dcastel](https://discourse.julialang.org/u/dcastel)
#### Post date: [September 17, 2020, 9:09am UTC](https://discourse.julialang.org/t/are-custom-sysimages-cross-platform-for-the-same-julia-version/46764/1 "2020-09-17T09:09:52Z")
Hi all,
I was wondering the sysimages of [PackageCompiler](https://github.com/JuliaLang/PackageCompiler.jl) are they cross-platform for the same Julia version? Furthermore (and related) do the sysimages contain lowered LLVM code or do they actually contain platform specific assembly?
kr,
Dieter
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### Author:  [@xiaodai](https://discourse.julialang.org/u/xiaodai)
#### Post date: [September 17, 2020, 10:16am UTC](https://discourse.julialang.org/t/are-custom-sysimages-cross-platform-for-the-same-julia-version/46764/2 "2020-09-17T10:16:12Z")
Yeah. It’s docs somewhere. It’s not cross-platform
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### Author:  [@kristoffer.carlsson](https://discourse.julialang.org/u/kristoffer.carlsson)
#### Post date: [September 17, 2020, 10:37am UTC](https://discourse.julialang.org/t/are-custom-sysimages-cross-platform-for-the-same-julia-version/46764/3 "2020-09-17T10:37:23Z")
> [@dcastel](#):
>
> contain lowered LLVM code or do they actually contain platform specific assembly?
They contain among other things native code (assembly).