Allow LinearSolve v4#135
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LinearSolve is releasing a breaking v4 (batched matrix right-hand sides, SciML/LinearSolve.jl#1072). AlgebraicMultigrid uses only the stable LinearSolve API (SciMLLinearSolveAlgorithm, build_linear_solution, the LinearCache interface), none of which changes in v4, so widening compat is sufficient. Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com> Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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LinearSolve.jl is preparing a breaking v4.0.0 (batched matrix right-hand sides, SciML/LinearSolve.jl#1072, at @ChrisRackauckas's direction). The breaking surface is only the solution shape for matrix right-hand sides (
ubecomesn×kinstead of a flattened vector) plus an informative error for matrixbwith iterative solvers — nothing AlgebraicMultigrid touches:SciMLLinearSolveAlgorithm,init/solve!, theLinearCacheinterface,build_linear_solution, and theprecsAPI are all unchanged.Verified locally against LinearSolve v4 (this branch dev'd together with the v4 branch):
AlgebraicMultigridJL()(Ruge–Stuben) andSmoothedAggregationAMGas LinearSolve algorithms solve correctly withReturnCode.Success;aspreconditioner(ruge_stuben(A))withKrylovJL_GMRESyields bit-identical residuals under v3.87.0 and v4.0.0.Includes a patch bump to 2.0.1 so this can be tagged directly. Widening compat before v4 is registered lets the ecosystem resolve as soon as v4 lands.