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#serial 103
dnl FIXME: when this goes back into automake, reset this to a small number
dnl From Jim Meyering.
dnl FIXME: this should migrate into libit.
dnl FIXME: when this goes back into automake, remove all jm_ prefixes
AC_DEFUN(jm_AM_FUNC_MKTIME,
[AC_REQUIRE([AC_HEADER_TIME])dnl
AC_CHECK_HEADERS(sys/time.h unistd.h)
AC_CHECK_FUNCS(alarm)
AC_CACHE_CHECK([for working mktime], jm_am_cv_func_working_mktime,
[AC_TRY_RUN(
changequote(<<, >>)dnl
<</* Test program from Paul Eggert (eggert@twinsun.com)
and Tony Leneis (tony@plaza.ds.adp.com). */
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#if !HAVE_ALARM
# define alarm(X) /* empty */
#endif
/* Work around redefinition to rpl_putenv by other config tests. */
#undef putenv
static time_t time_t_max;
/* Values we'll use to set the TZ environment variable. */
static const char *const tz_strings[] = {
(const char *) 0, "GMT0", "JST-9",
"EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
};
#define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
static void
mktime_test (now)
time_t now;
{
struct tm *lt;
if ((lt = localtime (&now)) && mktime (lt) != now)
exit (1);
now = time_t_max - now;
if ((lt = localtime (&now)) && mktime (lt) != now)
exit (1);
}
static void
irix_6_4_bug ()
{
/* Based on code from Ariel Faigon. */
struct tm tm;
tm.tm_year = 96;
tm.tm_mon = 3;
tm.tm_mday = 0;
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = 0;
tm.tm_isdst = -1;
mktime (&tm);
if (tm.tm_mon != 2 || tm.tm_mday != 31)
exit (1);
}
static void
bigtime_test (j)
int j;
{
struct tm tm;
time_t now;
tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
/* This test makes some buggy mktime implementations loop.
Give up after 10 seconds. */
alarm (10);
now = mktime (&tm);
alarm (0);
if (now != (time_t) -1)
{
struct tm *lt = localtime (&now);
if (! (lt
&& lt->tm_year == tm.tm_year
&& lt->tm_mon == tm.tm_mon
&& lt->tm_mday == tm.tm_mday
&& lt->tm_hour == tm.tm_hour
&& lt->tm_min == tm.tm_min
&& lt->tm_sec == tm.tm_sec
&& lt->tm_yday == tm.tm_yday
&& lt->tm_wday == tm.tm_wday
&& ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
== (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
exit (1);
}
}
int
main ()
{
time_t t, delta;
int i, j;
for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
continue;
time_t_max--;
delta = time_t_max / 997; /* a suitable prime number */
for (i = 0; i < N_STRINGS; i++)
{
if (tz_strings[i])
putenv (tz_strings[i]);
for (t = 0; t <= time_t_max - delta; t += delta)
mktime_test (t);
mktime_test ((time_t) 60 * 60);
mktime_test ((time_t) 60 * 60 * 24);
for (j = 1; 0 < j; j *= 2)
bigtime_test (j);
bigtime_test (j - 1);
}
irix_6_4_bug ();
exit (0);
}
>>,
changequote([, ])dnl
jm_am_cv_func_working_mktime=yes, jm_am_cv_func_working_mktime=no,
dnl When crosscompiling, assume mktime is missing or broken.
jm_am_cv_func_working_mktime=no)
])
if test $jm_am_cv_func_working_mktime = no; then
LIBOBJS="$LIBOBJS mktime.o"
fi
])
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