-#serial 103
-dnl FIXME: when this goes back into automake, reset this to a small number
+#serial 1001
-dnl From Jim Meyering.
-dnl FIXME: this should migrate into libit.
-
-dnl FIXME: when this goes back into automake, remove all jm_ prefixes
+dnl Just like mktime.m4 from automake-1.3b, but with an additional test.
+dnl Renamed to have jm_ prefix and to use jm_ prefix on cache variable names.
AC_DEFUN(jm_AM_FUNC_MKTIME,
[AC_REQUIRE([AC_HEADER_TIME])dnl
# 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"
+ (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;
time_t t, delta;
int i, j;
+ spring_forward_gap ();
for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
continue;
time_t_max--;