Fix ABI incompatible C++03 nullptr_t In C++03 libc++ emulates nullptr_t using a class, and #define's nullptr. However this makes nullptr_t mangle differently between C++03 and C++11. This breaks any function ABI which takes nullptr_t. Thanfully Clang provides __nullptr in all dialects. This patch adds an ABI option to switch to using __nullptr in C++03. In a perfect world I would like to turn this on by default, since it's just ABI breaking fix to an ABI breaking bug. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@290662 91177308-0d34-0410-b5e6-96231b3b80d8
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