[tz] [PROPOSED 2/2] strftime: conform better to POSIX+

[Paul Eggert]

On 8/13/20 10:52 PM, Robert Elz wrote:
> I suppose that might be technically allowed

Yes, it's allowed.

> 	if (tm_sec == INT_MAX) {
> 		tm_sec--;
> 		if (mktime() != (time_t)-2)
> 			/* error case */;
> 		else
> 			/* was Dec 31, 1969, UTC */;
> 	} else {
> 		tm_sec++;
> 		if (mktime() != (time_t)0)
> 			/* error case */;
> 		else
> 			/* was Dec 31, 1969 */;
> 	}

If this is the sort of thing portable code needs to do in order to determine 
whether mktime has succeeded, then mktime's API needs improving.