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PR libstdc++/57394 * include/bits/ios_base.h (ios_base(const ios_base&)): Define as deleted for C++11. (operator=(const ios_base&)): Likewise. * include/std/streambuf: Remove trailing whitespace. (basic_streambuf(const basic_streambuf&)): Fix initializer for _M_out_end. Define as defaulted for C++11. (operator=(const basic_streambuf&)): Define as defaulted for C++11. (swap(basic_streambuf&)): Define for C++11. * testsuite/27_io/basic_streambuf/cons/57394.cc: New. From-SVN: r210228