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CXX_EXTENSIONS
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Boolean specifying whether compiler specific extensions are requested.
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This property specifies whether compiler specific extensions should be
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used. For some compilers, this results in adding a flag such
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as ``-std=gnu++11`` instead of ``-std=c++11`` to the compile line. This
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property is ``ON`` by default.
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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_CXX_EXTENSIONS` variable if it is set when a target
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is created.
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