CMake: improve setting C++ standard and configuration summary

CMake/fl_add_library.cmake: set target_compile_features(.. cxx_std_NN)
  which is inherited by consumers of the library.
  This prevents CMake user projects from failing if they would
  otherwise compile with an older C++ standard.

CMake/fl_debug_var.cmake: add INTERFACE_COMPILE_FEATURES to fl_debug_target()

CMake/fl_summary.cmake: update summary format for longer variable names

CMakeLists.txt:
  - check CMAKE_CXX_STANDARD given by the user (commandline)
    and set C++ standard related CMake variables in the CMake cache.
    The latter is experimental: setting in the cache may be reverted.
  - add C++ standard related info to configure summary.

0 files changed, 0 insertions, 0 deletions