[cxxmodules] Disable module file validation.

[vgvassilev]

We need to disable the validation of PCM files because rootcling
serializes what it sees. For instance, we even serialize in the PCM
file some temporary lookup buffers and the contents of the module maps.

We disable the PCH validation but that is not sufficient for PCM. The
TCling code fInterpreter->getCI()->getPreprocessorOpts().DisablePCHValidation = true
is not enough because we rely more on the clang driver to setup correctly
our modules-aware interpreter.

This patch just uses the correct flag when setting up cling.

A proper fix to this issue is thoroughly described in RE-0003 (rootcling
refactor proposal).

[phsft-bot]

Starting build on centos7/gcc49, mac1012/native, slc6/gcc49, slc6/gcc62, slc6/gcc62, ubuntu14/native, ubuntu14/native, windows10/vc15 with flags -Dvc=OFF -Dimt=ON -Dccache=ON
How to customize builds

[vgvassilev]

@phsft-bot just on slc6/gcc62 with flags -Druntime_cxxmodules=On -Dctest_test_exclude_none=on

[vgvassilev]

@phsft-bot build just on slc6/gcc62 with flags -Druntime_cxxmodules=On -Dctest_test_exclude_none=on

[phsft-bot]

Starting build on slc6/gcc62 with flags -Dvc=OFF -Dimt=ON -Dccache=ON -Druntime_cxxmodules=On -Dctest_test_exclude_none=on
How to customize builds

[phsft-bot]

Build failed on slc6/gcc62.
See console output.

Errors:

• 293/1648 Test Fix GCC 6 compilation (tested on ArchLinux) #188: tutorial-dataframe-tdf013_InspectAnalysis .........................................................***Failed Error regular expression found in output. Regex=[: error:] 3.05 sec
• 543/1648 Test ROOTR fixed event loop #446: tutorial-math-quasirandom .........................................................................***Failed Error regular expression found in output. Regex=[: error:] 1.40 sec
• 569/1648 Test Added a modulemap for libc #477: tutorial-multicore-mtbb201_parallelHistoFill ......................................................***Failed Error regular expression found in output. Regex=[: error:] 4.38 sec
• 685/1648 Test gROOTMutex -> RWLock #596: tutorial-roostats-Zbi_Zgamma ......................................................................***Failed Error regular expression found in output. Regex=[: error:] 13.01 sec
• 697/1648 Test Update Vc version to 1.3.2 and suppress warnings by including it as a system header #608: tutorial-roostats-rs_numbercountingutils ..........................................................***Failed Error regular expression found in output. Regex=[: error:] 8.11 sec
• 732/1648 Test Remove llvm from cling runtime #648: tutorial-tmva-keras-LaunchClasGUI .................................................................***Failed Error regular expression found in output. Regex=[: error:] 0.67 sec
• 733/1648 Test Several fixes and improvements for the vectorized implementations #649: tutorial-tmva-keras-LaunchMultiGUI ................................................................***Failed Error regular expression found in output. Regex=[: error:] 1.89 sec
• 734/1648 Test Fixing an O(N^2) scaling problem caused by TTree::Draw() #650: tutorial-tmva-keras-LaunchRegGUI ..................................................................***Failed Error regular expression found in output. Regex=[: error:] 2.29 sec
• 776/1648 Test Vectorization fixes, improvements and new features #699: tutorial-dataframe-tdf002_dataModel-py ............................................................***Failed Error regular expression found in output. Regex=[: error:] 3.76 sec

Warnings:

• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module Core:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module listDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module dequeDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module valarrayDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module vectorDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module unordered_multisetDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module mapDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module unordered_setDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module multimapDict:
• Warning in <GenerateModule>: warning: Couldn't find the following specified headers in the module map2Dict:

And 7 more

Failing tests:

• projectroot.runtutorials.tutorial_tmva_TMVAMulticlass
• projectroot.runtutorials.tutorial_tmva_TMVARegression
• projectroot.test.test_stressentrylist_interpreted
• projectroot.runtutorials.tutorial_dataframe_tdf013_InspectAnalysis
• projectroot.runtutorials.tutorial_math_quasirandom
• projectroot.runtutorials.tutorial_multicore_mt303_AsyncSimple
• projectroot.runtutorials.tutorial_multicore_mt305_TFuture
• projectroot.runtutorials.tutorial_multicore_mt304_AsyncNested
• projectroot.runtutorials.tutorial_multicore_mtbb201_parallelHistoFill
• projectroot.runtutorials.tutorial_roostats_Zbi_Zgamma

And 47 more

[vgvassilev]

@phsft-bot build with flags -Druntime_cxxmodules=Off

[phsft-bot]

Starting build on centos7/gcc49, mac1012/native, slc6/gcc49, slc6/gcc62, slc6/gcc62, ubuntu14/native, ubuntu14/native, windows10/vc15 with flags -Dvc=OFF -Dimt=ON -Dccache=ON -Druntime_cxxmodules=Off
How to customize builds

[Teemperor]

LGTM