# OBJC_EXTENSIONS

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=gnu11` instead of `-std=c11` to the compile line. This property is `ON` by default. The basic OBJC standard level is controlled by the `OBJC_STANDARD` target property.

If the property is not set, and the project has set the `C_EXTENSIONS`, the value of `C_EXTENSIONS` is set for `OBJC_EXTENSIONS`.

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

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