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#serial 2
dnl From Jim Meyering.
dnl FIXME: this should migrate into libit.
AC_DEFUN(AM_FUNC_MKTIME,
[AC_REQUIRE([AC_HEADER_TIME])dnl
AC_CHECK_HEADERS(sys/time.h)
AC_CACHE_CHECK([for working mktime], 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
static time_t time_t_max;
/* Values we'll use to set the TZ environment variable. */
static const char *const tz_strings[] = {
NULL, "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;
{
if (mktime (localtime (&now)) != now)
exit (1);
now = time_t_max - now;
if (mktime (localtime (&now)) != now)
exit (1);
}
int
main ()
{
time_t t, delta;
int i;
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);
}
exit (0);
}
>>,
changequote([, ])dnl
am_cv_func_working_mktime=yes, am_cv_func_working_mktime=no,
dnl When crosscompiling, assume mktime is missing or broken.
am_cv_func_working_mktime=no)
])
if test $am_cv_func_working_mktime = no; then
LIBOBJS="$LIBOBJS mktime.o"
fi
])
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