forked from boostorg/config
New libc++ versions remove `std::auto_ptr` when building as C++17, unless the magic tag `_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR` is defined. Tell the rest of Boost that there's no `auto_ptr` in that case.
New libc++ versions remove `std::auto_ptr` when building as C++17, unless the magic tag `_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR` is defined. Tell the rest of Boost that there's no `auto_ptr` in that case.