D24841: Use modern way to set the C/CXX standard

[David Faure]

dfaure added a comment.


  Where did -std=gnu++14 come from? The old code above certainly didn't set it.
  
  Maybe some projects were doing `set(CMAKE_CXX_STANDARD 14)` before including KDECompilerSettings? We could test the var here to avoid overwriting it...

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D24841

To: vonreth, dfaure, cullmann
Cc: cgiboudeaux, aacid, chehrlic, kde-frameworks-devel, kde-buildsystem, LeGast00n, GB_2, bencreasy, michaelh, ngraham, bruns
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