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Re: Gradle bootstrap build with maven

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Hi Moritz,

Le 2025-03-16 11:10, Moritz a écrit :
> 
> I got interested in the problem of bootstrapping a modern versions of 
> Gradle, mainly due to the old version available in Debian. As far as I 
> can tell, efforts have been mostly focused on using older versions to 
> bootstrap an up-to-date version.

Most but not all. My own branch also uses the same version of Gradle to 
rebuild itself.

> I wanted to explore the feasibility and effort required to bootstrap 
> with Maven instead. I now have a working purely Maven-based build that 
> generates a distribution capable of building Gradle itself. The code is 
> available here 
> <https://github.com/MorMundHS-MA/gradle-maven-bootstrap>.

That's an interesting approach. Did you use a generator for the pom.xml 
files, and if so how much manual adjustment was required afterwards?

On my side I've started to write a Makefile generator that uses Gradle 
itself to generate the recipes. It's not finished (and not functional) 
yet, but you can get an idea of what the result would look like there 
[1]. The generator is the MakefileMaker class at the bottom of [2]. I'm 
planning to add custom logic to generate the additional code and 
properties at (re)build time. The idea is to have something reasonably 
simple that could be used to bootstrap a future version with minimal or 
no changes (ideally) to the generation logic.

> While it was fun, I am not sure how much this actually helps as it 
> still requires a pre-build Kotlin compiler (at least 1.8 I think, even 
> though >2.0 is used). Additionally some of the other dependencies are 
> also built with Gradle and would have to be bootstrapped as well. But I 
> wanted to share my progress so far non the less.

They still use Kotlin 2.0.21 currently, setting the source compatibility 
to 1.9 (or 1.8 maybe?) to force the use of the legacy K1 compiler, and 
adding another legacy dependency as they use APIs that are now 
deprecated and even removed for some. It's possible to compile the 
Kotlin code using older compilers (with a few minor adjustments 
eventually) but the Kotlin scripting integration (DSL) in Gradle is much 
less likely to be buildable or work with older versions of Kotlin 
compiler libraries without some extensive changes.

So far the only other dependencies I found that will need to be 
bootstrapped in the same batch (with gradle and kotlin) are:
- kotlinx.serialization
- kotlinx-metadata-jvm 0.5.0 (Kotlin 1.8.10 is the last release with 
that version).

Thank you for sharing this. I will add a link to your repository on my 
own wip/README.

Cheers,


[1]: 
https://salsa.debian.org/jpd/gradle/-/blob/478abafcd391cc28549f9b369d7b42a3febb3197/debian/gradle.Makefile
[2]: 
https://salsa.debian.org/jpd/gradle/-/blob/478abafcd391cc28549f9b369d7b42a3febb3197/debian/init.d/gradlebuild/DebianGradleBuildPlugin.gradle#L638

-- 
Julien Plissonneau Duquène

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Thread

Gradle bootstrap build with maven Moritz <mormund@mailbox.org> - 2025-03-16 11:20 +0100
  Re: Gradle bootstrap build with maven Julien Plissonneau Duquène <sre4ever@free.fr> - 2025-03-17 10:50 +0100
    Re: Gradle bootstrap build with maven Moritz <mormund@mailbox.org> - 2025-03-17 21:50 +0100
      Re: Gradle bootstrap build with maven Julien Plissonneau Duquène <sre4ever@free.fr> - 2025-03-18 10:30 +0100

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