-#serial 103
-dnl FIXME: when this goes back into automake, reset this to a small number
+#serial 1000
-dnl From Jim Meyering.
-dnl FIXME: this should migrate into libit.
+dnl From Paul Eggert
+dnl Check for a working mktime.
+dnl This is a preview of what should appear in the next public autoconf release.
-dnl FIXME: when this goes back into automake, remove all jm_ prefixes
+dnl Override any existing definition.
+undefine([AC_FUNC_MKTIME])
-AC_DEFUN(jm_AM_FUNC_MKTIME,
+AC_DEFUN(AC_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(
+AC_CHECK_HEADERS(sys/time.h unistd.h)
+AC_CHECK_FUNCS(alarm)
+AC_CACHE_CHECK([for working mktime], ac_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). */
/* 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"
+ (const char *) 0, "TZ=GMT0", "TZ=JST-9",
+ "TZ=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]))
+/* Fail if mktime fails to convert a date in the spring-forward gap.
+ Based on a problem report from Andreas Jaeger. */
+static void
+spring_forward_gap ()
+{
+ /* glibc (up to about 1998-10-07) failed this test) */
+ struct tm tm;
+
+ /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
+ instead of "TZ=America/Vancouver" in order to detect the bug even
+ on systems that don't support the Olson extension, or don't have the
+ full zoneinfo tables installed. */
+ putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
+
+ tm.tm_year = 98;
+ tm.tm_mon = 3;
+ tm.tm_mday = 5;
+ tm.tm_hour = 2;
+ tm.tm_min = 0;
+ tm.tm_sec = 0;
+ tm.tm_isdst = -1;
+ if (mktime (&tm) == (time_t)-1)
+ exit (1);
+}
+
static void
mktime_test (now)
time_t now;
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);
time_t t, delta;
int i, j;
+ /* This test makes some buggy mktime implementations loop.
+ Give up after 60 seconds; a mktime slower than that
+ isn't worth using anyway. */
+ alarm (60);
+
for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
continue;
time_t_max--;
bigtime_test (j - 1);
}
irix_6_4_bug ();
+ spring_forward_gap ();
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
+ac_cv_func_working_mktime=yes, ac_cv_func_working_mktime=no,
+ac_cv_func_working_mktime=no)])
+if test $ac_cv_func_working_mktime = no; then
+ LIBOBJS="$LIBOBJS mktime.${ac_objext}"
+fi
])