New in version 3.16.

Boolean specifying whether compiler specific extensions are requested.

This property specifies whether compiler specific extensions should be used. For some compilers, this results in adding a flag such as -std=gnu++11 instead of -std=c++11 to the compile line. This property is ON by default. The basic ObjC++ standard level is controlled by the OBJCXX_STANDARD target property.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

If the property is not set, and the project has set the CXX_EXTENSIONS, the value of CXX_EXTENSIONS is set for OBJCXX_EXTENSIONS.

This property is initialized by the value of the CMAKE_OBJCXX_EXTENSIONS variable if set when a target is created and otherwise by the value of CMAKE_OBJCXX_EXTENSIONS_DEFAULT (see CMP0128).