Improve detection of whether tzset is broken.
diff --git a/configure.in b/configure.in
index 70e1ff9..78ccfe1 100644
--- a/configure.in
+++ b/configure.in
@@ -2810,20 +2810,39 @@
AC_TRY_RUN([
#include <stdlib.h>
#include <time.h>
+#include <string.h>
int main()
{
- int gmt_hour;
- int eastern_hour;
- time_t now;
- now = time((time_t*)NULL);
+ /* Note that we need to ensure that not only does tzset(3)
+ do 'something' with localtime, but it works as documented
+ in the library reference and as expected by the test suite.
+
+ Red Hat 6.2 doesn't understand the southern hemisphere
+ after New Year's Day; it thinks swaps on that day.
+ */
+
+ time_t groundhogday = 1044144000; /* GMT-based; well, it's a colony */
+ time_t midyear = groundhogday + (365 * 24 * 3600 / 2);
+
putenv("TZ=UTC+0");
tzset();
- gmt_hour = localtime(&now)->tm_hour;
+ if (localtime(&groundhogday)->tm_hour != 0)
+ exit(1);
+
putenv("TZ=EST+5EDT,M4.1.0,M10.5.0");
tzset();
- eastern_hour = localtime(&now)->tm_hour;
- if (eastern_hour == gmt_hour)
+ if (localtime(&groundhogday)->tm_hour != 19)
exit(1);
+
+ putenv("TZ=AEST-10AEDT-11,M10.5.0,M3.5.0");
+ tzset();
+ if (localtime(&groundhogday)->tm_hour != 11)
+ exit(1);
+ if (strcmp(localtime(&groundhogday)->tm_zone, "AEDT"))
+ exit(1);
+ if (strcmp(localtime(&midyear)->tm_zone, "AEST"))
+ exit(1);
+
exit(0);
}
],