RecoHI/HiJetAlgos: resolve GCC warnings about unknown pragma

[davidlt]

GCC correctly ignores unknown (Clang) pragma. These warnings needs to be
disabled in command line and not via #pragma GCC diagnostic, which does
not correctly work with GCC (a long standing bug in C++ preprocessor).

Marking #pragma as GCC will not help as warning is Clang specific, not
yet supported in GCC.

Signed-off-by: David Abdurachmanov David.Abdurachmanov@cern.ch

[cmsbuild]

A new Pull Request was created by @davidlt for CMSSW_7_4_X.

RecoHI/HiJetAlgos: resolve GCC warnings about unknown pragma

It involves the following packages:

RecoHI/HiJetAlgos

@cmsbuild, @cvuosalo, @nclopezo, @slava77 can you please review it and eventually sign? Thanks.
@yslai, @jazzitup, @richard-cms, @appeltel, @yenjie, @kurtejung, @mandrenguyen, @dgulhan, @yetkinyilmaz this is something you requested to watch as well.
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[cmsbuild]

+1
Tested at: 66aa37f
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7450/2218/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7450/2218/summary.html

[slava77]

+1

for #7450 66aa37f
the warnings are gone
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7450/2218/build.log

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes (tests are also fine). This pull request will be automatically merged.