llvm: Drop libcxx, libcxxabi, libunwind runtime as we use gcc-toolchain

[smuzaffar]

No description provided.

[smuzaffar]

please test using full cmssw

[cmsbuild]

A new Pull Request was created by @smuzaffar for branch IB/CMSSW_16_1_X/master.

@akritkbehera, @iarspider, @raoatifshad, @smuzaffar can you please review it and eventually sign? Thanks.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.
cms-bot commands are listed here

[cmsbuild]

cms-bot internal usage

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d6a48b/52216/summary.html
COMMIT: 441b6f3
CMSSW: CMSSW_16_1_X_2026-03-24-1100/el8_amd64_gcc13
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/10442/52216/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @jeyserma Increase mass window in TkAlUpsilonMuMu ALCARECO selector cmssw#50499

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d6a48b/52216/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d6a48b/52216/git-merge-result

Comparison Summary

Summary:

• You potentially removed 165 lines from the logs
• Reco comparison results: 8 differences found in the comparisons
• DQMHistoTests: Total files compared: 53
• DQMHistoTests: Total histograms compared: 4185300
• DQMHistoTests: Total failures: 32
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 4185248
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 52 files compared)
• Checked 227 log files, 198 edm output root files, 53 DQM output files
• TriggerResults: no differences found

[smuzaffar]

Please test using full cmssw for CMSSW_16_1_CLANG_X

[smuzaffar]

please test using full cmssw for CMSSW_16_1_CLANG_X

[cmsbuild]

Pull request #10442 was updated.

[smuzaffar]

+externals

good to go in default IBs

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_16_1_X/master IBs after it passes the integration tests. This pull request will now be reviewed by the release team before it's merged. @ftenchini, @mandrenguyen, @sextonkennedy (and backports should be raised in the release meeting by the corresponding L2)

[cmsbuild]

-1

Failed Tests: UnitTests
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d6a48b/52224/summary.html
COMMIT: 2e181fd
CMSSW: CMSSW_16_1_CLANG_X_2026-03-24-2300/el8_amd64_gcc13
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/10442/52224/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @yeckang [GEM] Introducing GE21 rechit container for Run 3 cmssw#49476
• @Dr15Jones Add WatchRuns to calibration stream modules cmssw#50514
• @andreypz Update of DT ttrig calibration workflows for 16_X (fix ROOT issues) cmssw#50463
• @wddgit Remove dependence of FWCore on FWStorage cmssw#50486
• @akritkbehera Fixed Uninitialized warnings for RecoTracker in ASAN IBs cmssw#50240
• @Dr15Jones Add WatchRuns to HLTPathSelector cmssw#50518
• @perrotta Update DeDx calibration tag in the 2025 HI MC GT cmssw#50507
• @bsunanda Phase2-hgx365V2 Further update thecodes and XML files for 2025 HGCal TB Studies cmssw#50506
• @Dr15Jones Use WatchRuns in alignment stream modules cmssw#50513

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d6a48b/52224/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-d6a48b/52224/git-merge-result

Failed Unit Tests

I found 1 errors in the following unit tests:

---> test TestDQMOnlineClient-gem_dqm_sourceclient had ERRORS

Comparison Summary

Summary:

• You potentially added 236 lines to the logs
• ROOTFileChecks: Some differences in event products or their sizes found
• Reco comparison results: 103916 differences found in the comparisons
• DQMHistoTests: Total files compared: 53
• DQMHistoTests: Total histograms compared: 4185300
• DQMHistoTests: Total failures: 531113
• DQMHistoTests: Total nulls: 344
• DQMHistoTests: Total successes: 3653823
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -1.4709999999999996 KiB( 52 files compared)
• DQMHistoSizes: changed ( 10224.0 ): -0.171 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 13034.0 ): 1.470 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 17034.0 ): 3.847 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 18634.0 ): -3.364 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 2024.0000001,... ): -0.008 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0040001 ): 0.035 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0050001 ): -0.012 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0060001 ): -0.016 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 250202.181 ): 0.278 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 25202.0 ): -0.415 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 7.3 ): ...
• Checked 227 log files, 198 edm output root files, 53 DQM output files
• TriggerResults: found differences in 20 / 51 workflows