Add riscv64 build support

[kasperk81]

Description of Change

Add linux-riscv64 and linux-musl-riscv64 support. Debian 12 with clang 19 and libfontconfig1_2.15.0-2 (http://deb.debian.org/debian/pool/main/f/fontconfig/) is a good baseline to start.

Bugs Fixed

• Fixes [FEATURE] riscv64 flavor of libSkiaSharp and libHarfBuzzSharp #3191

API Changes

None.

Behavioral Changes

None.

Required skia PR

None.

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

[mattleibow]

/azp run

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[mattleibow]

/azp run

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[mattleibow]

While we wait for the build to run again, are you able to confirm that the artifacts work in the first run? https://dev.azure.com/xamarin/public/_build/results?buildId=137319&view=results

[mattleibow]

/azp run

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[mattleibow]

Thanks for getting this PR up and iterating on it. So far CI has been green all the way.

This is looking done, except for 2 small issues:

• the other 2 targets files also need the risc items
• there are double files in the nuget (not because of this PR) and if you are able to just fix the wildcards

[mattleibow]

/azp run

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[mattleibow]

I see all the linux tests are failing with :

System.TypeInitializationException : The type initializer for 'SkiaSharp.SKImageInfo' threw an exception.
---- System.DllNotFoundException : Unable to load shared library 'libSkiaSharp' or one of its dependencies. 

It could either be that the so is truly not there OR it may be the so is depending on something that is not there.

[mattleibow]

Actually, all of my CI is failing with that - even those with no changes... I wonder if the azure devops image is broken somehow.

Let me rebuild main and see what happens.

[kasperk81]

the fix is #3194

[mattleibow]

Thanks for the work on this PR!

[mattleibow]

This build should be on the preview feed as nightly 19

[aicynide]

@kasperk81 please add linux-bionic build support also 🙏 for arm64, x64 and x86 Architectures
Please

[kasperk81]

@aicynide, android has its own package https://www.nuget.org/packages/SkiaSharp.NativeAssets.Android

[aicynide]

@aicynide, android has its own package https://www.nuget.org/packages/SkiaSharp.NativeAssets.Android

Yes you are I think SkiaSharp my work under linux-bionic but issue is with sqlitePCL.raw libe_sqlite.so https://github.com/termux/termux-packages/actions/runs/13115509057/job/36588727595?pr=23074#step:6:2786
linux-bionic-{arch} is somewhat different from android. android-{arch} is for android but linux-bionic-{arch} is for Termux
I'm a termux package contributor and package maintainer, currently I'm working on porting jellyfin to termux and some dependencies of jellyfin like SQLITEPCL.raw nuget is available for linux-bionic

It would be a huge help if you can provide SQLITEPCL.raw 's libe_sqlite.so for linux-bionic

Thank you

[mattleibow]

@aicynide please open a new issue.

[mattleibow]

Hi folks,

The builds are now available on the preview feed: https://aka.ms/skiasharp-eap/index.json
Let me know if version 3.119.0-preview.0.38 is now working again for you.

As soon as you let me know, I can release this to NuGet and then hopefully a stable version shortly afterwards.