[gcc15] Update GCC to version 15.3.0 plus minor bugfixes

[fwyzard]

No description provided.

[fwyzard]

please test

[cmsbuild]

A new Pull Request was created by @fwyzard for branch IB/CMSSW_20_1_X/g15.

@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

[smuzaffar]

please test using full cmssw for CMSSW_20_1_X/el9_amd64_gcc15

[cmsbuild]

-1

Failed Tests: UnitTests
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3bd749/53906/summary.html
COMMIT: fe098c0
CMSSW: CMSSW_20_1_X_2026-06-11-2300/el9_amd64_gcc15
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmsdist/10629/53906/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:

• @cms-sw cms-common: GIT_SSL_CAINFO fix for slc5/6/7 #10628
• @SegmentLinking Simplification in the definition of Phase 2 HLT workflows cmssw#51142
• @bfonta Fix separate option in HGCAL validation cmssw#51168
• @makortel Include reduced ProcessingHistory ID to DiagStreamerFile checks cmssw#51193
• @cms-ngt-hlt [NGT] Bug fix for tau prevalidation sequence in Run2 workflow cmssw#51198

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3bd749/53906/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3bd749/53906/git-merge-result

Failed Unit Tests

I found 1 errors in the following unit tests:

---> test CudaGCCSupport had ERRORS

Comparison Summary

Summary:

• You potentially added 189 lines to the logs
• Reco comparison results: 77440 differences found in the comparisons
• DQMHistoTests: Total files compared: 44
• DQMHistoTests: Total histograms compared: 3267025
• DQMHistoTests: Total failures: 350744
• DQMHistoTests: Total nulls: 238
• DQMHistoTests: Total successes: 2916025
• DQMHistoTests: Total skipped: 18
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 5.853 KiB( 43 files compared)
• DQMHistoSizes: changed ( 18434.0 ): -0.004 KiB MessageLogger/Errors
• DQMHistoSizes: changed ( 18434.0 ): -0.004 KiB MessageLogger/Warnings
• DQMHistoSizes: changed ( 2022.0010001 ): -0.008 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2023.0020001,... ): -0.012 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0000001 ): -0.020 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0030001 ): -0.016 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0040001,... ): -0.004 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0050001 ): -0.027 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0060001 ): 0.004 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 7.3 ): 5.960 KiB SiStrip/MechanicalView
• Checked 191 log files, 159 edm output root files, 44 DQM output files

[smuzaffar]

please test using full cmssw for CMSSW_20_1_X/el10_amd64_gcc15

[smuzaffar]

+externals

el9/gcc15 and el10/gcc15 externals build without any failures. Lets get this in IBs

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_20_1_X/g15 IBs after it passes the integration tests. This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @mandrenguyen, @ftenchini (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-3bd749/53917/summary.html
COMMIT: fe098c0
CMSSW: CMSSW_20_1_X_2026-06-11-2300/el10_amd64_gcc15
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmsdist/10629/53917/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:

• @cms-sw SCRAMV1 V3_00_93: Added support control statements like for/foreach #10625
• @cms-sw cms-common: GIT_SSL_CAINFO fix for slc5/6/7 #10628
• @SegmentLinking Simplification in the definition of Phase 2 HLT workflows cmssw#51142
• @bfonta Fix separate option in HGCAL validation cmssw#51168
• @makortel Include reduced ProcessingHistory ID to DiagStreamerFile checks cmssw#51193
• @cms-ngt-hlt [NGT] Bug fix for tau prevalidation sequence in Run2 workflow cmssw#51198

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3bd749/53917/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3bd749/53917/git-merge-result

Failed Unit Tests

I found 2 errors in the following unit tests:

---> test CudaGCCSupport had ERRORS
---> test testVolumes had ERRORS

Comparison Summary

Summary:

• You potentially added 174 lines to the logs
• ROOTFileChecks: Some differences in event products or their sizes found
• Reco comparison results: 79051 differences found in the comparisons
• DQMHistoTests: Total files compared: 44
• DQMHistoTests: Total histograms compared: 3267025
• DQMHistoTests: Total failures: 318361
• DQMHistoTests: Total nulls: 230
• DQMHistoTests: Total successes: 2948416
• DQMHistoTests: Total skipped: 18
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.04899999999999993 KiB( 43 files compared)
• DQMHistoSizes: changed ( 18434.0 ): -0.004 KiB MessageLogger/Errors
• DQMHistoSizes: changed ( 18434.0 ): -0.004 KiB MessageLogger/Warnings
• DQMHistoSizes: changed ( 2022.0010001 ): -0.008 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2023.0020001,... ): -0.012 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0000001 ): -0.020 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0030001 ): -0.016 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0040001,... ): -0.004 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0050001 ): -0.027 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 2024.0060001 ): 0.004 KiB JetMET/SUSYDQM
• DQMHistoSizes: changed ( 7.3 ): 2.599 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 8.0 ): ...
• Checked 191 log files, 159 edm output root files, 44 DQM output files