_EXTENSIONS ----------------- The variations are: * :prop_tgt:`C_EXTENSIONS` * :prop_tgt:`CXX_EXTENSIONS` * :prop_tgt:`CUDA_EXTENSIONS` * :prop_tgt:`HIP_EXTENSIONS` * :prop_tgt:`OBJC_EXTENSIONS` * :prop_tgt:`OBJCXX_EXTENSIONS` These properties specify whether compiler-specific extensions are requested. These properties are initialized by the value of the :variable:`CMAKE__EXTENSIONS` variable if it is set when a target is created and otherwise by the value of :variable:`CMAKE__EXTENSIONS_DEFAULT` (see :policy:`CMP0128`). 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.