[WIP] Increase minimum supported Julia version to v1.10

[sloede]

Please do not merge yet until we are sure that everything still works, including downstream packages.

TODO

• Create issue to turn Plots.jl functionality into an extension, such that we can get rid of Requires.jl for good ($\to$ Move Plots.jl functionality into an extension #2216)
• Check Trixi2Vtk.jl and make it fit for Julia v1.10
• Check other main downstream packages' CI (TrixiSW, TrixiA, libtrixi)

[github-actions]

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Created with ❤️ by the Trixi.jl community.

[huiyuxie]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.09%. Comparing base (f09a707) to head (db5526f).

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HEAD has 5 uploads less than BASE

Flag	BASE (f09a707)	HEAD (db5526f)
unittests	26	21

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2214       +/-   ##
===========================================
- Coverage   96.37%   81.09%   -15.29%     
===========================================
  Files         486      486               
  Lines       39186    39097       -89     
===========================================
- Hits        37764    31702     -6062     
- Misses       1422     7395     +5973     

Flag	Coverage Δ
unittests	81.09% <100.00%> (-15.29%)	⬇️

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[sloede]

It seems like only the subcell limiting tests in Trixi2Vtk.jl are affected:
https://github.com/trixi-framework/Trixi.jl/actions/runs/12408649578/job/34640720806?pr=2214

@bennibolm @amrueda Any idea what's going on or why this might be?

[sloede]

@ranocha Do you understand this error in the downgrade test?
https://github.com/trixi-framework/Trixi.jl/actions/runs/12408649811/job/34640722004?pr=2214#step:8:56

I don't understand whether it's Test.jl or Downloads.jl that's the culprit. It seems like we need to up the lower bound for at least one of them.

[JoshuaLampert]

@ranocha Do you understand this error in the downgrade test?
trixi-framework/Trixi.jl/actions/runs/12408649811/job/34640722004?pr=2214#step:8:56

I don't understand whether it's Test.jl or Downloads.jl that's the culprit. It seems like we need to up the lower bound for at least one of them.

We need to skip both of them in line 75 of the Downgrade job

[JoshuaLampert]

@ranocha Do you understand this error in the downgrade test?
trixi-framework/Trixi.jl/actions/runs/12408649811/job/34640722004?pr=2214#step:8:56
I don't understand whether it's Test.jl or Downloads.jl that's the culprit. It seems like we need to up the lower bound for at least one of them.

We need to skip Test.jl in line 75 of the Downgrade job

See the explanation of the skip keyword here: https://github.com/julia-actions/julia-downgrade-compat?tab=readme-ov-file#usage. All standard libraries need to be skipped.

[sloede]

@JoshuaLampert Thanks! Let's see if a133041 fixes this...

[JoshuaLampert]

@JoshuaLampert Thanks! Let's see if a133041 fixes this...

Next standard library... (Random.jl) 😅

[ranocha]

Why did you decide to use 1.11 for this?

[sloede]

Since otherwise threaded_legacy remains unused. I thought this would be an initial and small step towards testing at least some parts on v1.11. But I can also just remove it, I have no strong opinion here either way

[ranocha]

We should remove the dependency on Requires.jl - I cannot comment on the line here

[sloede]

This is only possible once we move Plots.jl into an extension. I'd rather do this in a separate PR, since I do not have the resources to do this at the moment.

[sloede]

Tracked in #2216

[bennibolm]

It seems like only the subcell limiting tests in Trixi2Vtk.jl are affected: https://github.com/trixi-framework/Trixi.jl/actions/runs/12408649578/job/34640720806?pr=2214

@bennibolm @amrueda Any idea what's going on or why this might be?

If I get it correctly, those errors are somehow expected. Since we are using Julia 1.9 (and 1.7) in the test in Trixi2Vtk.jl, those numbers of the subcell limiting were calculated using 1.9.
Now, we are testing with 1.10 here. So, since the subcell numbers are very susceptible to small changes, those failing tests are expected, I think.

It should be relatively simple to fix that: Open a PR in Trixi2Vtk.jl using 1.10 instead of 1.9, download the "result files" there and push them to Trixi2Vtk_reference_files. I'm happy to help with this.

[sloede]

It seems like only the subcell limiting tests in Trixi2Vtk.jl are affected: https://github.com/trixi-framework/Trixi.jl/actions/runs/12408649578/job/34640720806?pr=2214
@bennibolm @amrueda Any idea what's going on or why this might be?

If I get it correctly, those errors are somehow expected. Since we are using Julia 1.9 (and 1.7) in the test in Trixi2Vtk.jl, those numbers of the subcell limiting were calculated using 1.9. Now, we are testing with 1.10 here. So, since the subcell numbers are very susceptible to small changes, those failing tests are expected, I think.

It should be relatively simple to fix that: Open a PR in Trixi2Vtk.jl using 1.10 instead of 1.9, download the "result files" there and push them to Trixi2Vtk_reference_files. I'm happy to help with this.

Thanks a lot for the clarification and for your offer to help! It would be great if you could prepare a similar to PR to this one here for Trixi2Vtk.jl, essentially switching over to Julia v1.10 for all testing. Once that's in place, we can also merge this PR here.

If you have questions about what needs to be changed in the CI and how, please let me know (in the PR or via Slack).