LLVM dropped support for Visual Studio versions older than 2015 quite some time ago, so I consider it safe to drop libc++'s support for older CRTs. The CRT in Visual Studio 2015 provides a lot of previously missing functions, so targeting it requires less special casing. Differential Revision: https://reviews.llvm.org/D31798 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@299743 91177308-0d34-0410-b5e6-96231b3b80d8