#include <stdio.h>
#include <time.h>
int main()
{
struct tm t2 = { 0, 0, 0, 1, 1, 2050 - 1900, 1, 1, 1};
time_t tt2 = mktime(&t2);
printf("%ld\n");
return 0;
}

That should print -1, but instead it prints 2147483647.
Sometime in 2063 mktime() starts returning -1 as it should.

------- Additional Comment #1 From Jakub Jelinek 2006-09-08 11:21 -------

In this case diff of approx_biennia of repaired_t0 and approx_requested_biennia
is smaller than overflow_threshold (on 32-bit arches that's 21 biennia) and
so mktime_internal sets *offset to a very large value and continues rather than
returning -1 right away.  Not sure where the code should find that the current
timezone offset is not enough to undo the overflow.

------- Additional Comment #2 From Paul Eggert 2006-09-08 22:55 -------

I've fixed this in gnulib mktime.c; you can find the patch in:

http://cvs.savannah.gnu.org/viewcvs/gnulib/lib/mktime.c?root=gnulib&r1=1.53&r2=1.54

Can you please port this patch back to glibc?  Thanks.

------- Additional Comment #3 From Ulrich Drepper 2006-09-09 16:56 -------

I added the patch to cvs.