chore: root-6.40.02

[wdconinc]

Briefly, what does this PR introduce? Please link to any relevant presentations or discussions.

This PR updates ROOT to v6.40.02 (release notes).

Needs:

• root: patch for tessellated closure checks after initialization eic-spack#948

What is the urgency of this PR?

• High (please describe reason below)
• Medium
• Low

What kind of change does this PR introduce?

• Bug fix (issue #__)
• New feature (issue: ROOT upgrade)
• Optimization (issue #__)
• Updated documentation
• other: __

Please check if any of the following apply

• This PR introduces breaking changes. Please describe changes users need to make below.
• This PR changes default behavior. Please describe changes below.
• AI was used in preparing this PR. Please describe usage below.

[Copilot]

Pull request overview

This PR aims to upgrade the ROOT version used in the EIC container Spack environment to v6.40.00 by pulling in upstream spack/spack-packages changes via cherry-picks.

Changes:

• Added three spack/spack-packages cherry-pick commits related to ROOT (v6.36.12, builtin LLVM variant support, v6.40.00).

[wdconinc]

Failure in https://github.com/eic/containers/actions/runs/26316798957/job/77483990403?pr=298#step:3:1001 attributed to root-project/root#22395

[wdconinc]

sim:lowq2_reconstruction https://eicweb.phy.anl.gov/EIC/benchmarks/detector_benchmarks/-/jobs/7934403#L1101:

localrule filter_hepmc_for_training:
    input: warmup.edm4hep.root, /builds/EIC/benchmarks/detector_benchmarks/benchmarks/lowq2_reconstruction/filterHEPMC3.py (cached)
    output: sim_output/lowq2_reconstruction/Low-Q2_Training_Events.hepmc3.tree.root
    jobid: 2
    reason: Missing output files: sim_output/lowq2_reconstruction/Low-Q2_Training_Events.hepmc3.tree.root; Input files updated by another job: warmup.edm4hep.root
    resources: tmpdir=/tmp
fatal error: module map file '../../include/root/ROOT.modulemap' not found
fatal error: module map file '../../include/root/ROOT.modulemap' not found

bench:drich_fixed_eta https://eicweb.phy.anl.gov/EIC/benchmarks/detector_benchmarks/-/jobs/7934618 is the same as in #297 and needs eic/eic-spack#943

[github-actions]

Capybara summary for PR 298

• rec_dis_10x100_minQ2=1000_epic_craterlake (new artifact) (ref artifact)
• rec_dis_10x100_minQ2=1_epic_craterlake (new artifact) (ref artifact)
• rec_dis_18x275_minQ2=1000_epic_craterlake (new artifact) (ref artifact)
• rec_dis_18x275_minQ2=1_epic_craterlake (new artifact) (ref artifact)
• rec_dis_5x41_minQ2=1_epic_craterlake (new artifact) (ref artifact)
• rec_e_1GeV_20GeV_epic_craterlake (new artifact) (ref artifact)
• rec_pi_1GeV_20GeV_epic_craterlake (new artifact) (ref artifact)
• sim_dis_10x100_minQ2=1000_epic_craterlake (new artifact) (ref artifact)
• sim_dis_10x100_minQ2=1_epic_craterlake (new artifact) (ref artifact)
• sim_dis_18x275_minQ2=1000_epic_craterlake (new artifact) (ref artifact)
• sim_dis_18x275_minQ2=1_epic_craterlake (new artifact) (ref artifact)
• sim_dis_5x41_minQ2=1_epic_craterlake (new artifact) (ref artifact)
• sim_e_1GeV_20GeV_epic_craterlake (new artifact) (ref artifact)
• sim_pi_1GeV_20GeV_epic_craterlake (new artifact) (ref artifact)
  ^{_{Last updated 2026-06-25T02:36-04:00 8e508b1}}

[wdconinc]

https://eicweb.phy.anl.gov/EIC/benchmarks/detector_benchmarks/-/jobs/8009886#L1102

fatal error: module map file '../../include/root/ROOT.modulemap' not found