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Avoid building an intermediate buffer to print to stderr, push directly to stderr. libstdc++-v3/ChangeLog: * include/debug/formatter.h (_Error_formatter::_Parameter::_Named): New. (_Error_formatter::_Parameter::_Type): Inherit latter. (_Error_formatter::_Parameter::_M_integer): Likewise. (_Error_formatter::_Parameter::_M_string): Likewise. * src/c++11/debug.cc: Include <cstring>. (_Print_func_t): New. (print_raw(PrintContext&, const char*, ptrdiff_t)): New. (print_word): Use '%.*s' format in fprintf to render only expected number of chars. (pretty_print(PrintContext&, const char*, _Print_func_t)): New. (print_type): Rename in... (print_type_info): ...this. Use pretty_print. (print_address, print_integer): New. (print_named_name, print_iterator_constness, print_iterator_state): New. (print_iterator_seq_type): New. (print_named_field, print_type_field, print_instance_field, print_iterator_field): New. (print_field): Use latters. (print_quoted_named_name, print_type_type, print_type, print_instance): New. (print_string(PrintContext&, const char*, const _Parameter*, size_t)): Change signature to... (print_string(PrintContext&, const char*, ptrdiff_t, const _Parameter*, size_t)): ...this and adapt. Remove intermediate buffer to render input string. (print_string(PrintContext&, const char*, ptrdiff_t)): New.