CXX_STANDARD

Added in version 3.1.

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

This property specifies the C++ 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. For compilers that have no notion of a standard level, such as Microsoft Visual C++ before 2015 Update 3, this has no effect.

Supported values are:

98

C++98

11

C++11

14

C++14

17

Added in version 3.8.

C++17

20

Added in version 3.12.

C++20

23

Added in version 3.20.

C++23

26

Added in version 3.25.

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:

set_property(TARGET tgt PROPERTY CXX_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 CXX_STANDARD_REQUIRED target property. Additionally, the CXX_EXTENSIONS target property may be used to control whether compiler-specific extensions are enabled on a per-target basis.

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_CXX_STANDARD variable if it is set when a target is created.