GIT_SILENT: use CMAKE_CXX_STANDARD_REQUIRED

2 jobs for master in 20 minutes and 29 seconds (queued for 86 minutes and 40 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #52662

00:12:26

passed linux kf5-qt5 qt5.12 #52661

00:08:02

75.0%