git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_60@326317
91177308-0d34-0410-b5e6-
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conforming GNU extensions. Projects incompatible with C++14 can add
``-std=gnu++98`` to their build settings to restore the previous behaviour.
-- Added support for some features from the C++ standard after C++14
+- Added support for some features from the C++ standard after C++17
(provisionally known as C++2a but expected to be C++20). This support can be
enabled with the ``-std=c++2a`` flag. This enables: