1998-10-16 Tom Tromey <tromey@cygnus.com>
+ * m4/mktime.m4: Detect glibc mktime bug. From Jim Meyering.
+
* Makefile.am (SUBDIRS): Added `.' again.
* Makefile.am (EXTRA_DIST): Removed automake.spec.in. From
/* 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;
bigtime_test (j - 1);
}
irix_6_4_bug ();
+ spring_forward_gap ();
exit (0);
}
>>,