[metacling] Use dl_iterate_phdr() to collect shlibs, fixes #6797:

[smuzaffar]

Walking the dyld map manually is missing the libc lock. Instead, use the
official interface for this. Make sure that any call to UpdateListOfLoadedSharedLibraries
is actually locked by gInterpreterMutex.

(cherry picked from commit 653d927)

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch cms/v6-22-00-patches/d9daad3.

@cmsbuild, @smuzaffar, @mrodozov can you please review it and eventually sign? Thanks.
cms-bot commands are listed here

[smuzaffar]

please test for CMSSW_11_2_ROOT622_X

[cmsbuild]

The tests are being triggered in jenkins.
Test Parameters:

• RELEASE_FORMAT = CMSSW_11_2_ROOT622_X
• CMSSW_11_2_ROOT622_X_2020-11-24-2300/slc7_amd64_gcc820: https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/11035/console Started: 2020/11/25 16:25

[cmsbuild]

+1
Tested at: 15a44f1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3f47ae/11035/summary.html
CMSSW: CMSSW_11_2_ROOT622_X_2020-11-24-2300
SCRAM_ARCH: slc7_amd64_gcc820

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3f47ae/11035/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 2274 differences found in the comparisons
• DQMHistoTests: Total files compared: 37
• DQMHistoTests: Total histograms compared: 2963516
• DQMHistoTests: Total failures: 54292
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2909202
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 36 files compared)
• Checked 158 log files, 34 edm output root files, 37 DQM output files

[smuzaffar]

please test

[cmsbuild]

The tests are being triggered in jenkins.

• CMSSW_11_2_X_2020-11-25-2300/slc7_amd64_gcc820: https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/11055/console Started: 2020/11/26 09:08

[cmsbuild]

+1
Tested at: 15a44f1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3f47ae/11055/summary.html
CMSSW: CMSSW_11_2_X_2020-11-25-2300
SCRAM_ARCH: slc7_amd64_gcc820

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3f47ae/11055/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 8 differences found in the comparisons
• DQMHistoTests: Total files compared: 36
• DQMHistoTests: Total histograms compared: 2747014
• DQMHistoTests: Total failures: 12
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 2746979
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.004 KiB( 35 files compared)
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• Checked 153 log files, 34 edm output root files, 36 DQM output files