move out LinearAlgebra into its own repository

[KristofferC]

This moves out LinearAlgebra into its own repo https://github.com/JuliaLang/LinearAlgebra.jl. This repo is still a bit bare (README needs to be added) but it has CI set up to run on buildkite (https://buildkite.com/julialang/linearalgebra-dot-jl/builds/18) and doc building on GHA. The external repo has all commits up to 4709b6c included in it.

The reason for the move is to be able to focus issues and PRs and development regarding LinearAlgebra in one place.

[ViralBShah]

So I assume we should hold on merging any linalg PRs in the main julia repo now, right? Issues can be transferred - but do we just close all the linalg PRs?

[IanButterworth]

Shame github has stopped showing lines removed on https://github.com/JuliaLang/julia/graphs/contributors

[KristofferC]

Heyy, when did they remove that :(

[IanButterworth]

I heard about it on the Julia Dispatch Podcast #ad

[gitboy16]

Hi, might be a dumb question but I was wondering if there is a way to build Julia without LinearAlgebra? More generally speaking is there a mechanism to choose which library to include or exclude while building Julia?

[giordano]

Heyy, when did they remove that :(

I'm pretty sure it was since one year ago, they announced it on the blog, can't find the post now though. Edit: here it is: https://github.blog/changelog/2023-11-29-upcoming-changes-to-repository-insights/

[ViralBShah]

Should we turn off LinearAlgebra testing for every commit on the Julia repo now? Is there a way to run it much more selectively, or only when LinearAlgebra PRs are merged?

Maybe a possible way to do this is for BumpStdlibs.jl PRs to run the testsuite for all stdlibs (but not julia compiler/runtime tests).

@DilumAluthge Thoughts?

[IanButterworth]

Could we run it as a regular GitHub action test on Linux only, like we do for Revise (but not on the buildkite system)? That way it's in parallel so should still have the same effect of speeding up CI, but less chance of regression.

[ViralBShah]

Even so - the full LinearAlgebra testsuite is overkill - but that is a separate issue being discussed in JuliaLang/LinearAlgebra.jl#1117.

[KristofferC]

I suggested running it when:

• The LinearAlgebra.version file is changed.
• On backports and release branches.

[DilumAluthge]

@fatteneder has been doing some work on filtering tests based on the contents of the PR. See e.g. JuliaCI/julia-buildkite#400

I'd suggest that we first finish up JuliaCI/julia-buildkite#400 and get that merged, and then the next step will be to build the "only run stdlib tests sometimes" functionality on top of the functionality in JuliaCI/julia-buildkite#400.

[DilumAluthge]

Here's a tracking issue: JuliaCI/julia-buildkite#411

[waldyrious]

Just for historical reference: this PR closed^† issue #22698, "Move LinearAlgebra to its own repo" (which now lives at JuliaLang/LinearAlgebra.jl#446).

^{† Or would have, if it hadn't been preemptively closed 😅}