[llvm-branch-commits] [cfe-branch] r326297 - A few release notes updates for C++ support in Clang 6.0.
Richard Smith via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Tue Feb 27 18:59:20 PST 2018
Date: Tue Feb 27 18:59:20 2018
New Revision: 326297
A few release notes updates for C++ support in Clang 6.0.
--- cfe/branches/release_60/docs/ReleaseNotes.rst (original)
+++ cfe/branches/release_60/docs/ReleaseNotes.rst Tue Feb 27 18:59:20 2018
@@ -174,6 +174,34 @@ C++ Language Changes in Clang
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
+ (provisionally known as C++2a but expected to be C++20). This support can be
+ enabled with the ``-std=c++2a`` flag. This enables:
+ - Support for ``__VA_OPT__``, to allow variadic macros to easily provide
+ different expansions when they are invoked without variadic arguments.
+ - Recognition of the ``<=>`` token (the C++2a three-way comparison operator).
+ - Support for default member initializers for bit-fields.
+ - Lambda capture of ``*this``.
+ - Pointer-to-member calls using ``const &``-qualified pointers on temporary objects.
+ All of these features other than ``__VA_OPT__`` and ``<=>`` are made
+ available with a warning in earlier C++ language modes.
+- A warning has been added for a ``<=`` token followed immediately by a ``>``
+ character. Code containing such constructs will change meaning in C++2a due
+ to the addition of the ``<=>`` operator.
+- Clang implements the "destroying operator delete" feature described in C++
+ committee paper `P0722R1
+ which is targeting inclusion in C++2a but has not yet been voted into the C++
+ working draft. Support for this feature is enabled by the presence of the
+ standard library type ``std::destroying_delete_t``.
OpenCL C Language Changes in Clang
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