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GDB 14 will add a new ValuePrinter tag class that will be used to signal that pretty-printers will agree to the "extension protocol" -- essentially that they will follow some simple namespace rules, so that GDB can add new methods over time. A couple new methods have already been added to GDB, to support DAP. While I haven't implemented these for any libstdc++ printers yet, this patch makes the basic conversion: printers derive from gdb.ValuePrinter if it is available, and all "non-standard" (that is, not specified by GDB) members of the various value-printing classes are renamed to have a leading underscore. libstdc++-v3/ChangeLog: * python/libstdcxx/v6/printers.py: Use gdb.ValuePrinter everywhere. Rename members to start with "_".