_STANDARD_REQUIRED ------------------------ The variations are: * :prop_tgt:`C_STANDARD_REQUIRED` * :prop_tgt:`CXX_STANDARD_REQUIRED` * :prop_tgt:`CUDA_STANDARD_REQUIRED` * :prop_tgt:`HIP_STANDARD_REQUIRED` * :prop_tgt:`OBJC_STANDARD_REQUIRED` * :prop_tgt:`OBJCXX_STANDARD_REQUIRED` These properties specify whether the value of :prop_tgt:`_STANDARD` is a requirement. When ``OFF`` or unset, the :prop_tgt:`_STANDARD` target property is treated as optional and may "decay" to a previous standard if the requested is not available. These properties are initialized by the value of the :variable:`CMAKE__STANDARD_REQUIRED` variable if it is set when a target is created. For supported CMake versions see the respective pages. To control language standard versions see :prop_tgt:`_STANDARD`. See the :manual:`cmake-compile-features(7)` manual for information on compile features and a list of supported compilers.