CMake/Help/variable/CMAKE_CXX_STANDARD.rst

CMAKE_CXX_STANDARD
------------------

Default value for ``CXX_STANDARD`` property of targets.

This variable is used to initialize the :prop_tgt:`CXX_STANDARD`
property on all targets.  See that target property for additional
information.

See the :manual:`cmake-compile-features(7)` manual for information on
compile features.