[BuildRules] Fix for alpaka backend dict header/xml files flags

[smuzaffar]

Fixes cms-sw/cmssw#40846

• BuildFile's LCG_DICT_HEADER and LCG_DICT_XML flags are now only used for default dictionary generation.
• For alpaka backend, scram now looks for classes_<backend>.h and classes_<backend>_def.xml files. One can override this by adding ALPAKA_<BACKEND>_LCG_DICT_HEADER and ALPAKA_<BACKEND>_LCG_DICT_XML BuildFile flags. e.g

 <flags ALPAKA_CUDA_LCG_DICT_HEADER="classes_cuda_1.h classes_cuda_2.h"/> 
 <flags ALPAKA_CUDA_LCG_DICT_XML="classes_cuda_def_1.xml classes_cuda_def_2.xml"/> 
 <flags ALPAKA_ROCM_LCG_DICT_HEADER="classes_rocm_1.h classes_rocm_2.h"/> 
 <flags ALPAKA_ROCM_LCG_DICT_XML="classes_rocm_def_1.xml classes_rocm_def_2.xml"/> 

[smuzaffar]

test parameters:

• full_cmssw = true

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch IB/CMSSW_13_3_X/master.

@cmsbuild, @smuzaffar, @aandvalenzuela, @iarspider can you please review it and eventually sign? Thanks.
@rappoccio, @antoniovilela, @sextonkennedy you are the release manager for this.
cms-bot commands are listed here

[fwyzard]

please test

[cmsbuild]

-1

Failed Tests: UnitTests
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-886531/34822/summary.html
COMMIT: 4d67a0f
CMSSW: CMSSW_13_3_X_2023-09-19-1100/el8_amd64_gcc11
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmsdist/8705/34822/install.sh to create a dev area with all the needed externals and cmssw changes.

Unit Tests

I found 3 errors in the following unit tests:

---> test CondToolsLHCInfoNewPopConTest had ERRORS
---> test PrimaryVertex had ERRORS
---> test testPVPlotting had ERRORS

Comparison Summary

Summary:

• You potentially removed 178 lines from the logs
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 50
• DQMHistoTests: Total histograms compared: 3358044
• DQMHistoTests: Total failures: 3
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3358019
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 49 files compared)
• Checked 214 log files, 167 edm output root files, 50 DQM output files
• TriggerResults: no differences found

[smuzaffar]

+externals
unit tests are not related to this change

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_13_3_X/master IBs (but tests are reportedly failing). This pull request will now be reviewed by the release team before it's merged. @rappoccio, @antoniovilela, @sextonkennedy (and backports should be raised in the release meeting by the corresponding L2)