If I use a library or framework that's licensed under GPL, without modifying said library/framework in any way, do I still have to (as TFA puts it) "extend the

If I use a library or framework that's licensed under GPL, without modifying said library/framework in any way, do I still have to (as TFA puts it) "extend the copyleft nature" of GPL to my code? Yes, because the FSF's FAQ says that you do. Trying to argue that copyright law doesn't actually allow them to indiscriminately demand this would be expensive and would annoy lots of people, so is probably a bad idea regardless of that you'd likely win (unless you're doing it specifically to prove a point).