[Bug time/25039] New: mktime fails when .tm_isdst=1 on i686-linux-gnu with > 2.28-10

["winter-gcc at bfw-online dot de" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25039

            Bug ID: 25039
           Summary: mktime fails when .tm_isdst=1 on i686-linux-gnu with >
                    2.28-10
           Product: glibc
           Version: 2.29
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: winter-gcc@bfw-online.de
  Target Milestone: ---
              Host: i686-linux-gnu

Created attachment 12005
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12005&action=edit
Repro/Regression test, fails when isdst = 1 on > glibc 2.28-10

Running test application on older glibc (2.28-10 Debian version):

# time in DST
$ ./a.out 1569497187
tzname[0] = CET
tzname[1] = CEST
timezone = -3600
daylight = 1
time   = 1569497187
.tm_isdst = 1
tzname[0] = UTC
tzname[1] = UTC
timezone = 0
daylight = 0
mktime = 1569504387 (time += 7200)
# time not in DST
$ ./a.out 1575198000
tzname[0] = CET
tzname[1] = CEST
timezone = -3600
daylight = 1
time   = 1575198000
.tm_isdst = 0
tzname[0] = UTC
tzname[1] = UTC
timezone = 0
daylight = 0
mktime = 1575201600 (time += 3600)

Regression with 2.29-2 (Debian version):

#  time in DST
$ ./a.out 1569497187
tzname[0] = CET
tzname[1] = CEST
timezone = -3600
daylight = 1
time   = 1569497187
.tm_isdst = 1
tzname[0] = UTC
tzname[1] = UTC
timezone = 0
daylight = 0
mktime = -1 (time += -1569497188)
# errno is EOVERFLOW

# time not in DST
$ ./a.out 1575198000
tzname[0] = CET
tzname[1] = CEST
timezone = -3600
daylight = 1
time   = 1575198000
.tm_isdst = 0
tzname[0] = UTC
tzname[1] = UTC
timezone = 0
daylight = 0
mktime = 1575201600 (time += 3600)

In compared the diff from 2.29-2 to git current master and could not detect
meaningful changes so I believe this test case still fails / show the
regression.

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