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

[Christophe Giboudeaux]

cgiboudeaux added a comment.


  I'm seeing build failures in several repositories seemingly caused by 6e3c794 <https://phabricator.kde.org/R240:6e3c794e7c637141613cc180d631c9eed319a72d> (eg akonadi, kasync)
  
  Building with clang9, before:
  `-std=c++0x -std=gnu++14` are set
  
  After:
  `-std=gnu++11`
  
  and the build fails with c++14 features such as `make_unique`

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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