I'd go so far as to say any implementation that doesn't conform to RFC 4180[1] is broken and should be fixed. The vast majority of implementations get this right, it's just that some that don't are so high profile it causes people to throw up their hands and give up.
The "dialect dependent" part is usually about escaping double quotes, new lines and line continuations.
Not a portable format, but it is not too bad (for this use) either considering the country list is mostly static