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CMake/Help/prop_tgt/CXX_STANDARD.rst

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cmTarget: Add CXX_STANDARD and CXX_EXTENSION target properties. These are used to determine whether to add -std=c++11, -std=gnu++11 etc flags on the compile line.
2013-10-13 04:00:24 +04:00
CXX_STANDARD
------------
Features: Decay language flag if requested is not available. Use the highest standard compile flags available if requested language version is too new. This supports use-cases like set(CMAKE_CXX_STANDARD 14) # Compiled with -std=c++11 with GNU 4.7, which has no -std=c++14 # or equivalent flag add_executable(main main.cpp) This can be used in combination with preprocessor defines which communicate the availability of certain language features for optional use.
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The C++ standard whose features are requested to build this target.
cmTarget: Add CXX_STANDARD and CXX_EXTENSION target properties. These are used to determine whether to add -std=c++11, -std=gnu++11 etc flags on the compile line.
2013-10-13 04:00:24 +04:00
Features: Decay language flag if requested is not available. Use the highest standard compile flags available if requested language version is too new. This supports use-cases like set(CMAKE_CXX_STANDARD 14) # Compiled with -std=c++11 with GNU 4.7, which has no -std=c++14 # or equivalent flag add_executable(main main.cpp) This can be used in combination with preprocessor defines which communicate the availability of certain language features for optional use.
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This property specifies the C++ standard whose features are requested
cmTarget: Add CXX_STANDARD and CXX_EXTENSION target properties. These are used to determine whether to add -std=c++11, -std=gnu++11 etc flags on the compile line.
2013-10-13 04:00:24 +04:00
to build this target. For some compilers, this results in adding a
Features: Enable compiler extensions by default. Compilers enable their extensions by default, and disabling them implicitly can lead to results which are surprising or non-obvious to debug. http://public.kitware.com/pipermail/cmake-developers/2014-May/010575.html http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/10214 https://www.mail-archive.com/cmake-developers@cmake.org/msg10116.html (Compiler feature extensions by default, 29 May 2014)
2014-05-30 17:03:45 +04:00
flag such as ``-std=gnu++11`` to the compile line.
cmTarget: Add CXX_STANDARD and CXX_EXTENSION target properties. These are used to determine whether to add -std=c++11, -std=gnu++11 etc flags on the compile line.
2013-10-13 04:00:24 +04:00
Help: Document valid 14 value for CXX_STANDARD. (#15339) Support was added in commit v3.1.0-rc1~475^2 (Features: Add support for C++14 features., 2014-05-06), but the documentation for this property was not amended.
2015-01-08 21:41:23 +03:00
Supported values are ``98``, ``11`` and ``14``.
cmTarget: Add CXX_STANDARD and CXX_EXTENSION target properties. These are used to determine whether to add -std=c++11, -std=gnu++11 etc flags on the compile line.
2013-10-13 04:00:24 +04:00
Features: Decay language flag if requested is not available. Use the highest standard compile flags available if requested language version is too new. This supports use-cases like set(CMAKE_CXX_STANDARD 14) # Compiled with -std=c++11 with GNU 4.7, which has no -std=c++14 # or equivalent flag add_executable(main main.cpp) This can be used in combination with preprocessor defines which communicate the availability of certain language features for optional use.
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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 CXX_STANDARD 11)
Features: Enable compiler extensions by default. Compilers enable their extensions by default, and disabling them implicitly can lead to results which are surprising or non-obvious to debug. http://public.kitware.com/pipermail/cmake-developers/2014-May/010575.html http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/10214 https://www.mail-archive.com/cmake-developers@cmake.org/msg10116.html (Compiler feature extensions by default, 29 May 2014)
2014-05-30 17:03:45 +04:00
with a compiler which does not support ``-std=gnu++11`` or an equivalent
Features: Decay language flag if requested is not available. Use the highest standard compile flags available if requested language version is too new. This supports use-cases like set(CMAKE_CXX_STANDARD 14) # Compiled with -std=c++11 with GNU 4.7, which has no -std=c++14 # or equivalent flag add_executable(main main.cpp) This can be used in combination with preprocessor defines which communicate the availability of certain language features for optional use.
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flag will not result in an error or warning, but will instead add the
Features: Enable compiler extensions by default. Compilers enable their extensions by default, and disabling them implicitly can lead to results which are surprising or non-obvious to debug. http://public.kitware.com/pipermail/cmake-developers/2014-May/010575.html http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/10214 https://www.mail-archive.com/cmake-developers@cmake.org/msg10116.html (Compiler feature extensions by default, 29 May 2014)
2014-05-30 17:03:45 +04:00
``-std=gnu++98`` flag if supported. This "decay" behavior may be controlled
cmTarget: Add CXX_STANDARD_REQUIRED to control decay.
2014-04-30 20:07:38 +04:00
with the :prop_tgt:`CXX_STANDARD_REQUIRED` target property.
Features: Decay language flag if requested is not available. Use the highest standard compile flags available if requested language version is too new. This supports use-cases like set(CMAKE_CXX_STANDARD 14) # Compiled with -std=c++11 with GNU 4.7, which has no -std=c++14 # or equivalent flag add_executable(main main.cpp) This can be used in combination with preprocessor defines which communicate the availability of certain language features for optional use.
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Help: Add a manual for compiler feature control. Link to it from the documentation of related properties, variables and commands. Extend the cmake-developer(7) documentation with notes on extending feature support for compilers.
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See the :manual:`cmake-compile-features(7)` manual for information on
compile features.
cmTarget: Add CXX_STANDARD and CXX_EXTENSION target properties. These are used to determine whether to add -std=c++11, -std=gnu++11 etc flags on the compile line.
2013-10-13 04:00:24 +04:00
This property is initialized by the value of
the :variable:`CMAKE_CXX_STANDARD` variable if it is set when a target
is created.