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64 lines
1.7 KiB
64 lines
1.7 KiB
OBJCXX_STANDARD
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---------------
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.. versionadded:: 3.16
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The ObjC++ standard whose features are requested to build this target.
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This property specifies the ObjC++ standard whose features are requested
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to build this target. For some compilers, this results in adding a
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flag such as ``-std=gnu++11`` to the compile line.
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Supported values are:
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``98``
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Objective C++98
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``11``
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Objective C++11
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``14``
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Objective C++14
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``17``
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Objective C++17
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``20``
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Objective C++20
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``23``
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.. versionadded:: 3.20
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Objective C++23
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``26``
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.. versionadded:: 3.25
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Objective C++26. CMake 3.25 and later *recognize* ``26`` as a valid value,
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no version has support for any compiler.
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If the value requested does not result in a compile flag being added for
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the compiler in use, a previous standard flag will be added instead. This
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means that using:
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.. code-block:: cmake
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set_property(TARGET tgt PROPERTY OBJCXX_STANDARD 11)
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with a compiler which does not support ``-std=gnu++11`` or an equivalent
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flag will not result in an error or warning, but will instead add the
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``-std=gnu++98`` flag if supported. This "decay" behavior may be controlled
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with the :prop_tgt:`OBJCXX_STANDARD_REQUIRED` target property.
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Additionally, the :prop_tgt:`OBJCXX_EXTENSIONS` target property may be used to
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control whether compiler-specific extensions are enabled on a per-target basis.
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If the property is not set, and the project has set the :prop_tgt:`CXX_STANDARD`,
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the value of :prop_tgt:`CXX_STANDARD` is set for ``OBJCXX_STANDARD``.
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See the :manual:`cmake-compile-features(7)` manual for information on
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compile features and a list of supported compilers.
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This property is initialized by the value of
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the :variable:`CMAKE_OBJCXX_STANDARD` variable if it is set when a target
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is created.
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