GDB 14 will include a gdb.ValuePrinter tag class that can be used by pretty-printers to signal they will accept any extensions that GDB happens to make over time.
This series started as an attempt to change the libstdc++ printers to support this. This just involves renaming a bunch of attributes. There aren't many interesting GDB API additions yet (and I didn't implement the new ones in libstdc++ yet anyway), but seeing as these are the flagship pretty-printers, it seemed worthwhile to do. I added patch 1 when debugging the changes; then proceeded to fix a bunch of small issues that were pointed out by flake8. Tested on x86-64 Fedora 36. Let me know what you think. Tom
