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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)
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@@ -11,7 +11,7 @@ Specify compiler features required when compiling a given target. If the
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feature is not listed in the :variable:`CMAKE_C_COMPILE_FEATURES` variable
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or :variable:`CMAKE_CXX_COMPILE_FEATURES` variable,
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then an error will be reported by CMake. If the use of the feature requires
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an additional compiler flag, such as ``-std=c++11``, the flag will be added
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an additional compiler flag, such as ``-std=gnu++11``, the flag will be added
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automatically.
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The ``INTERFACE``, ``PUBLIC`` and ``PRIVATE`` keywords are required to
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