OBJCXX_STANDARD

.. versionadded:: 3.16

The ObjC++ standard whose features are requested to build this target.

This property specifies the ObjC++ standard whose features are requested to build this target. For some compilers, this results in adding a flag such as -std=gnu++11 to the compile line.

Supported values are:

98 Objective C++98

11 Objective C++11

14 Objective C++14

17 Objective C++17

20 Objective C++20

23 .. versionadded:: 3.20

Objective C++23

26 .. versionadded:: 3.25

Objective C++26. CMake 3.25 and later recognize 26 as a valid value, no version has support for any compiler.

If the value requested does not result in a compile flag being added for the compiler in use, a previous standard flag will be added instead. This means that using:

.. code-block:: cmake

set_property(TARGET tgt PROPERTY OBJCXX_STANDARD 11)

with a compiler which does not support -std=gnu++11 or an equivalent flag will not result in an error or warning, but will instead add the -std=gnu++98 flag if supported. This "decay" behavior may be controlled with the :prop_tgt:OBJCXX_STANDARD_REQUIRED target property. Additionally, the :prop_tgt:OBJCXX_EXTENSIONS target property may be used to control whether compiler-specific extensions are enabled on a per-target basis.

If the property is not set, and the project has set the :prop_tgt:CXX_STANDARD, the value of :prop_tgt:CXX_STANDARD is set for OBJCXX_STANDARD.

See the :manual: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 :variable:CMAKE_OBJCXX_STANDARD variable if it is set when a target is created.