[libcxx] Remove unexpected handlers in C++17
Summary:
This patch implements [P0003R5](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0003r5.html) which removes exception specifications from C++17.
The only changes to the library are removing `set_unexpected`, `get_unexpected`, `unexpected`, and `unexpected_handler`. These functions can be re-enabled in C++17 using `_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS`.
@mclow.lists what do you think about removing stuff is this way?
Reviewers: mclow.lists
Reviewed By: mclow.lists
Subscribers: mclow.lists, cfe-commits
Differential Revision: https://reviews.llvm.org/D28172
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@295406 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/UsingLibcxx.rst b/docs/UsingLibcxx.rst
index 6d910ca..9020a2c 100644
--- a/docs/UsingLibcxx.rst
+++ b/docs/UsingLibcxx.rst
@@ -180,3 +180,13 @@
* Giving `set`, `map`, `multiset`, `multimap` a comparator which is not
const callable.
+C++17 Specific Configuration Macros
+-----------------------------------
+**_LIBCPP_ENABLE_CXX17_REMOVED_FEATURES**:
+ This macro is used to re-enable all the features removed in C++17. The effect
+ is equivalent to manually defining each macro listed below.
+
+**_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS**:
+ This macro is used to re-enable the `set_unexpected`, `get_unexpected`, and
+ `unexpected` functions, which were removed in C++17. Unless this macro is
+ define those names will not be available in C++17.