> There is no guarantee that sizeof(long) > sizeof(int), in fact the GNU libc documentation states that int and long have the same size on the majority of supported platforms.

That used to be the case for 32-bit platforms, but most 64-bit platforms in which GNU libc runs use the LP64 model, which has 32-bit int and 64-bit long. That documentation seems to be a bit outdated.

(One notable 64-bit platform which uses 32-bit for both int and long is Microsoft Windows, but that's not one of the target platforms for GNU libc.)

Copypasting a comment into an LLM, and then copypasting its response back is not a useful contribution to a discussion, especially without even checking to be sure it got the answer right. If I wanted to know what an LLM had to say, I can go ask it myself; I'm on HN because I want to know what people have to say.

It literally returns a valid output value as an error.

> Meh. Just change the type to long long, and it works well.

C libraries tend to support a lot of exotic platforms. zlib for example supports Unicos, where int, long int and long long int are all 64 bits large.

I always downvote all AI-generated content regardless of whether it’s right or wrong, because I would like to discourage people from posting it.