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Andrea Valassi authored
build policies (CORALCOOL-2854). Allow the specification of build flags from outside cmake via CMAKE_CXX_FLAGS (e.g. by lcgcmake); use the c++xx build option specified in CMAKE_CXX_FLAGS if any, otherwise use c++1y for gcc49, c++14 for clang and gcc5x, and c++11 in all other cases. git-svn-id: file:///git/lcgcool.svndb/cool/trunk@19881 4525493e-7705-40b1-a816-d608a930855b
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