1OBJCXX_EXTENSIONS 2----------------- 3 4.. versionadded:: 3.16 5 6Boolean specifying whether compiler specific extensions are requested. 7 8This property specifies whether compiler specific extensions should be 9used. For some compilers, this results in adding a flag such 10as ``-std=gnu++11`` instead of ``-std=c++11`` to the compile line. This 11property is ``ON`` by default. The basic ObjC++ standard level is 12controlled by the :prop_tgt:`OBJCXX_STANDARD` target property. 13 14See the :manual:`cmake-compile-features(7)` manual for information on 15compile features and a list of supported compilers. 16 17If the property is not set, and the project has set the :prop_tgt:`CXX_EXTENSIONS`, 18the value of :prop_tgt:`CXX_EXTENSIONS` is set for :prop_tgt:`OBJCXX_EXTENSIONS`. 19 20This property is initialized by the value of 21the :variable:`CMAKE_OBJCXX_EXTENSIONS` variable if set when a target is 22created and otherwise by the value of 23:variable:`CMAKE_OBJCXX_EXTENSIONS_DEFAULT <CMAKE_<LANG>_EXTENSIONS_DEFAULT>` 24(see :policy:`CMP0128`). 25