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SYCL Updates, master branch (2020.08.14.)

Attila Krasznahorkay requested to merge akraszna/athena:SYCLUpdates-master-20200814 into master

I wrote a long and nice description about this. 😦 And then GitLab completely died under me, and forgot the whole text that I wrote. 😦

So screw it. One of the updates is here to get rid of these sort of warnings while compiling Athena with DPC++:

In file included from /data/projects/athena-gpu/athena/Control/StoreGate/src/ActiveStoreSvc.cxx:6:
In file included from /data/projects/athena-gpu/athena/Control/StoreGate/StoreGate/StoreGateSvc.h:22:
In file included from /data/projects/athena-gpu/athena/Control/StoreGate/StoreGate/tools/SGImplSvc.h:54:
In file included from /data/projects/athena-gpu/athena/Control/StoreGate/StoreGate/SGIterator.h:18:
In file included from /data/projects/athena-gpu/athena/Control/SGTools/SGTools/DataProxy.h:431:
In file included from /data/projects/athena-gpu/athena/Control/SGTools/SGTools/DataProxy.icc:16:
In file included from /data/projects/athena-gpu/athena/Control/AthenaKernel/AthenaKernel/StorableConversions.h:15:
In file included from /data/projects/athena-gpu/athena/Control/AthenaKernel/AthenaKernel/DataBucket.h:129:
/data/projects/athena-gpu/athena/Control/AthenaKernel/AthenaKernel/DataBucket.icc:186:18: warning: ISO C++ requires the name after '::~' to be found in the same scope as the name before '::~' [-Wdtor-name]
SG::DataBucket<T>::~DataBucket()
~~~~~~~~~~~~~~~~~^~
                 ::DataBucket
1 warning generated.

The other update is necessary to make DPC++ not freak out about multi-versioned functions. (See: https://github.com/intel/llvm/issues/2128)

Pinging @ssnyder.

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