Test on Julia 1.0 and Julia LTS

[devmotion]

We should test at least the oldest Julia version that we claim to support as well. I have seen in many projects how easy it is to accidentally introduce changes that break compatibility with older versions such as Julia 1.0. IMO it's fine to introduce them and drop support for e.g. Julia < 1.6 (I think generally one should aim for supporting at least Julia LTS) but if we don't run the tests we won't notice these incompatibilities.

Additionally, the PR removes tests with '1.8' since that is (currently) the same as '1' anyway ('1' points to the latest stable Julia release which is 1.8 at the moment). Instead I propose testing the LTS version as well, i.e., (currently) Julia 1.6.

[coveralls]

Pull Request Test Coverage Report for Build 4024781255

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.207%

---

Totals
Change from base Build 4001884408:	0.0%
Covered Lines:	25
Relevant Lines:	29

---

💛 - Coveralls

[codecov-commenter]

Codecov Report

Base: 86.20% // Head: 86.20% // No change to project coverage 👍

Coverage data is based on head (876bbc1) compared to base (cf375e5).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #21   +/-   ##
=======================================
  Coverage   86.20%   86.20%           
=======================================
  Files           3        3           
  Lines          29       29           
=======================================
  Hits           25       25           
  Misses          4        4           

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[zsteve]

Thanks for the PR and the explanation, I agree. I guess part of it was playing around with the breaking CI. Seems to be a libraries issue with v1.6

[devmotion]

The issue is JuliaPy/PyCall.jl#999, and the solution is to enforce the use of the Conda-version of libstdc++ with LD_PRELOAD.

[zsteve]

The issue is JuliaPy/PyCall.jl#999, and the solution is to enforce the use of the Conda-version of libstdc++ with LD_PRELOAD.

Hmm it still seems like Julia 1.6 with ubuntu-latest - x64 - conda is failing due to this workaround.

ERROR: ld.so: object '$HOME/.julia/conda/3/lib/libstdc++.so.6' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

Maybe it's worth bypassing the requirements this time?

[devmotion]

I wanted to fix it today, unfortunately didn't manage to continue with this PR yesterday.

[zsteve]

Yeah sorry for the mess, can't reproduce any of this on my local machine so just tweaking and seeing what CI does.

[devmotion]

OK, everything works apart from Windows + Julia 1.0. This remaining test failure is caused by JuliaPy/Conda.jl#230.