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Migrate converter generation to Gaudi v30r2

Frank Winklmeier requested to merge fwinkl/atlasexternals:declare_converter into master

In recent Gaudi versions the component declaration got a whole lot simpler and Gaudi v30r2 will drop the old macros (gaudi/Gaudi!420 (merged)). In particular:

  • DECLARE_FACTORY_ENTRIES is no longer needed (and with this there is no longer a separate footer needed for the _entries file)
  • _load and _entries.h files are no longer needed
  • Use DECLARE_CONVERTER to declare converter

Tested by recompiling all the relevant athena packages making use of poolcnv or sercnv.

❗ Requires Gaudi!175 (merged) to be merged and used in master first to provide the DECLARE_CONVERTER macro

cc @leggett

Here is an example of the new (and only) "components file":

> cat Event/xAOD/xAODCoreAthenaPool/xAODCoreAthenaPoolPoolCnv_entries.cxx
// Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
//
// Skeleton file for the entries implementation file generated by
// atlas_add_poolcnv.
//

// Declaration of the components:
#include "xAODAuxInfoBaseCnv.h"
DECLARE_CONVERTER( xAODAuxInfoBaseCnv )
#include "xAODAuxContainerBaseCnv.h"
DECLARE_CONVERTER( xAODAuxContainerBaseCnv )
#include "xAODShallowAuxContainerCnv.h"
DECLARE_CONVERTER( xAODShallowAuxContainerCnv )
#include "xAODShallowAuxInfoCnv.h"
DECLARE_CONVERTER( xAODShallowAuxInfoCnv )
Edited by Frank Winklmeier

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