tree d8fe7ee68315e64da9d7d3d07a1642ecb3865488
parent c84cd4a0908bb1bc2b09c3cbe1bf4c374e8e447e
author Marshall Clow <mclow.lists@gmail.com> 1484238307 +0000
committer Marshall Clow <mclow.lists@gmail.com> 1484238307 +0000

Add new macro _LIBCPP_BUILTIN_MEMCMP_ISCONSTEXPR to use in std::char_traits. 
This tells whether or not the builtin function __builtin_memcmp is constexpr.
Only defined for clang 4.0 and later, and not true for any shipping version of Apple's clang.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@291773 91177308-0d34-0410-b5e6-96231b3b80d8