[Core] New TSystem::CompileMacro flag, "h"

[dpiparo]

This Pull request:

Adds a new flag to CompileMacro, "h".

Changes or fixes:

This new functionality allows not to rebuild the macro even if the file is newer than the library based on a hash built for the macro and its name. This helps distributed execution, providing a clean way to augment python analyses with accelerated functions in C++ and compiled when the worker cannot be setup but just individual tasks.

Checklist:

• [v] tested changes locally
• [v] updated the docs (if necessary)

[phsft-bot]

Starting build on ROOT-performance-centos8-multicore/soversion, ROOT-ubuntu2204/nortcxxmod, ROOT-ubuntu2004/python3, mac12arm/cxx20, windows10/default How to customize builds

[ferdymercury]

Thanks Danilo! Now that you are modifying this file, maybe could you also address the two first points of this issue wrt the doxygen documentation? https://github.com/root-project/root/issues/10395 Thks

[dpiparo]

Hi @ferdymercury , thanks for the reminder - it's a good proposal. I propose to let the tests run and add one additional commit when some additional refinement is needed!

[phsft-bot]

Build failed on windows10/default. Running on null:C:\build\workspace\root-pullrequests-build See console output.

Errors:

• [2023-11-16T16:08:14.169Z] C:\build\workspace\root-pullrequests-build\root\core\base\src\TSystem.cxx(49,10): fatal error C1083: Cannot open include file: 'dlfcn.h': No such file or directory [C:\build\workspace\root-pullrequests-build\build\core\Core.vcxproj]

[phsft-bot]

Build failed on ROOT-ubuntu2204/nortcxxmod. Running on root-ubuntu-2204-1.cern.ch:/home/sftnight/build/workspace/root-pullrequests-build See console output.

Failing tests:

• projectroot.core.base.test.gtest_core_base_test_CoreBaseTests

[phsft-bot]

Build failed on ROOT-performance-centos8-multicore/soversion. Running on olbdw-01.cern.ch:/data/sftnight/workspace/root-pullrequests-build See console output.

[phsft-bot]

Build failed on ROOT-ubuntu2004/python3. Running on root-ubuntu-2004-3.cern.ch:/home/sftnight/build/workspace/root-pullrequests-build See console output.

Failing tests:

• projectroot.core.base.test.gtest_core_base_test_CoreBaseTests

[github-actions[bot]]

Test Results

       3 files         3 suites   11h 15m 27s :stopwatch: 2 443 tests 2 442 :heavy_check_mark: 0 :zzz: 1 :x: 7 268 runs  7 267 :heavy_check_mark: 0 :zzz: 1 :x:

For more details on these failures, see this check.

Results for commit 41c7b937.

[Axel-Naumann]

Can this new mode be the default? And we add option h for the old, non hash approach?