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|
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.
|
