Build FairShip with the separated libTPythia6.so library

[antonioiuliano2]

Dear all,

This pull request is related to the update for ROOT 6.32 without TPythia6 support:
ShipSoft/shipdist#102.

Basically, this pull request will tell FairShip to load the TPythia6 from the shared library, now separated from ROOT.

It is used by

• TPythia6Generator (compiled in shipgen), and run_simScript.py which calls it
• makeCascade.py
• makeMuonDIS.py

Best Regards,
Antonio

[olantwin]

We should also use find_package to specify TPythia6 as a dependency and use it to define include paths etc.

[olantwin]

Builds fine on SLC9

[olantwin]

@antonioiuliano2 Any updates on this?

[olantwin]

It would be good to add a changelog entry. While nothing user-facing should change, this is quite a major under-the-hood change.

[olantwin]

One thing we could try for backwards compatibility is to check whether ROOT has TPythia6, and if not search for the TPythia6 standalone package using find_package.
Right now you kind of do that implicitly by using only an additional include path, which might be blank. Unfortunately the lack of TPythia6 might only be noticed at runtime as a result.

[olantwin]

I think once we confirm that this build fine with:

• ROOT 6.30 with builtin TPythia6
• ROOT 6.32 with standalone TPythia6

And does not build with:

• ROOT 6.32 without standalone TPythia6

We can probably merge this first version.

A changelog entry would still be appreciated ;)

[olantwin]

@antonioiuliano2 Have you tried generating some muon DIS events with this branch?

[antonioiuliano2]

@antonioiuliano2 Have you tried generating some muon DIS events with this branch?

Yes, I did a test with the muonShieldOptimization/makeMuonDIS.py script and the default muConcrete.root file. Nothing out of the order to report.

It would be good to add a changelog entry. While nothing user-facing should change, this is quite a major under-the-hood change.

Added an entry to the CHANGELOG.

[olantwin]

Ok, could you please rebase?