Delphes & HepMC 2.06

[Xavier Rouby]

Compatibility issue with hepmc 2.06

Mail from Dean Horton, (april 2010)

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Hi,

I'm trying to use Delphes (v. 1.8) with some HepMC output I've generated using Pythia8. Unfortunately some errors occur whilst Delphes tries to convert the HepMC file. I've managed to get Delphes to work with some stdhep format files, so I know my installation is working. I notice that the current version of Delphes uses HepMC 2.04, whilst the current HepMC version is 2.06. Are you aware of any problems with reading any files produced using HepMC 2.06?

[sourav.mandal@…]

Delphes output with HepMC errors

[Sourav Mandal]

Here is the comment I wanted to make originally with my log output above; I put it here now for completeness:

The HepMC interface appears to have changed between versions 2.04, 2.05 and 2.06. This may be why the dynamic library version changed from 2 to 3 to 4 across these releases.

Downgrading my system HepMC to 2.04 worked around the problem -- ThePEG-1.7.0/Herwig++-2.5.0 is able to use it.

[cp3-support]

Starting to recompile delphes with hepmc 2.06.05 for tests.

[cp3-support]

What I did :

• import the hepmc structure into Utilities/HepMC
• change in the genmakefile Utilities/HepMC/interface to Utilities/HepMC/HepMC (this way we don't have to change the hepmc structure)
• change in .h and .cc files the includes as they fail: remove the /hepmc/ in front of includes.

This fails:

>> Building Resolutions_ATLAS
tmp/src/HepMCConverter.o: In function `HepMCConverter::HepMCConverter(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, PdgTable const&, int const&)':
HepMCConverter.cc:(.text+0x11c4): undefined reference to `HepMC::Units::default_momentum_unit()'
HepMCConverter.cc:(.text+0x11cf): undefined reference to `HepMC::Units::default_length_unit()'

more to come in the next issue

[cp3-support]

Succeeded in compiling w/ hepmc 2.06. After checks, it will be included in the next bugfix release.

[anonymous]

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