https://bugs.gentoo.org/220040

--- a/configure
+++ b/configure
@@ -12393,22 +12393,25 @@ else
 #line $LINENO "configure"
 #include "confdefs.h"
 /* Test program from Paul Eggert and Tony Leneis.  */
-#if TIME_WITH_SYS_TIME
+#ifdef TIME_WITH_SYS_TIME
 # include <sys/time.h>
 # include <time.h>
 #else
-# if HAVE_SYS_TIME_H
+# ifdef HAVE_SYS_TIME_H
 #  include <sys/time.h>
 # else
 #  include <time.h>
 # endif
 #endif
 
-#if HAVE_UNISTD_H
+#include <limits.h>
+#include <stdlib.h>
+
+#ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif
 
-#if !HAVE_ALARM
+#ifndef HAVE_ALARM
 # define alarm(X) /* empty */
 #endif
 
@@ -12416,6 +12419,7 @@ else
 #undef putenv
 
 static time_t time_t_max;
+static time_t time_t_min;
 
 /* Values we'll use to set the TZ environment variable.  */
 static const char *const tz_strings[] = {
@@ -12424,9 +12428,9 @@ static const char *const tz_strings[] = {
 };
 #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
 
-/* Fail if mktime fails to convert a date in the spring-forward gap.
+/* Return 0 if mktime fails to convert a date in the spring-forward gap.
    Based on a problem report from Andreas Jaeger.  */
-static void
+static int
 spring_forward_gap ()
 {
   /* glibc (up to about 1998-10-07) failed this test. */
@@ -12445,23 +12449,27 @@ spring_forward_gap ()
   tm.tm_min = 0;
   tm.tm_sec = 0;
   tm.tm_isdst = -1;
-  if (mktime (&tm) == (time_t)-1)
-    exit (1);
+  return mktime (&tm) != (time_t) -1;
 }
 
-static void
-mktime_test (now)
+static int
+mktime_test1 (now)
      time_t now;
 {
   struct tm *lt;
-  if ((lt = localtime (&now)) && mktime (lt) != now)
-    exit (1);
-  now = time_t_max - now;
-  if ((lt = localtime (&now)) && mktime (lt) != now)
-    exit (1);
+  return ! (lt = localtime (&now)) || mktime (lt) == now;
 }
 
-static void
+static int
+mktime_test (now)
+     time_t now;
+{
+  return (mktime_test1 (now)
+	  && mktime_test1 ((time_t) (time_t_max - now))
+	  && mktime_test1 ((time_t) (time_t_min + now)));
+}
+
+static int
 irix_6_4_bug ()
 {
   /* Based on code from Ariel Faigon.  */
@@ -12474,11 +12482,10 @@ irix_6_4_bug ()
   tm.tm_sec = 0;
   tm.tm_isdst = -1;
   mktime (&tm);
-  if (tm.tm_mon != 2 || tm.tm_mday != 31)
-    exit (1);
+  return tm.tm_mon == 2 && tm.tm_mday == 31;
 }
 
-static void
+static int
 bigtime_test (j)
      int j;
 {
@@ -12500,8 +12507,39 @@ bigtime_test (j)
 	     && lt->tm_wday == tm.tm_wday
 	     && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
 		  == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
-	exit (1);
+	return 0;
     }
+  return 1;
+}
+
+static int
+year_2050_test ()
+{
+  /* The correct answer for 2050-02-01 00:00:00 in Pacific time,
+     ignoring leap seconds.  */
+  unsigned long int answer = 2527315200UL;
+
+  struct tm tm;
+  time_t t;
+  tm.tm_year = 2050 - 1900;
+  tm.tm_mon = 2 - 1;
+  tm.tm_mday = 1;
+  tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+  tm.tm_isdst = -1;
+
+  /* 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");
+
+  t = mktime (&tm);
+
+  /* Check that the result is either a failure, or close enough
+     to the correct answer that we can assume the discrepancy is
+     due to leap seconds.  */
+  return (t == (time_t) -1
+	  || (0 < t && answer - 120 <= t && t <= answer + 120));
 }
 
 int
@@ -12515,9 +12553,15 @@ main ()
      isn't worth using anyway.  */
   alarm (60);
 
-  for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
-    continue;
-  time_t_max--;
+  for (;;)
+    {
+      t = (time_t_max << 1) + 1;
+      if (t <= time_t_max)
+	break;
+      time_t_max = t;
+    }
+  time_t_min = - ((time_t) ~ (time_t) 0 == (time_t) -1) - time_t_max;
+
   delta = time_t_max / 997; /* a suitable prime number */
   for (i = 0; i < N_STRINGS; i++)
     {
@@ -12525,17 +12569,22 @@ main ()
 	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);
-
-      for (j = 1; 0 < j; j *= 2)
-        bigtime_test (j);
-      bigtime_test (j - 1);
+	if (! mktime_test (t))
+	  return 1;
+      if (! (mktime_test ((time_t) 1)
+	     && mktime_test ((time_t) (60 * 60))
+	     && mktime_test ((time_t) (60 * 60 * 24))))
+	return 1;
+
+      for (j = 1; ; j <<= 1)
+	if (! bigtime_test (j))
+	  return 1;
+	else if (INT_MAX / 2 < j)
+	  break;
+      if (! bigtime_test (INT_MAX))
+	return 1;
     }
-  irix_6_4_bug ();
-  spring_forward_gap ();
-  exit (0);
+  return ! (irix_6_4_bug () && spring_forward_gap () && year_2050_test ());
 }
 _ACEOF
 rm -f conftest$ac_exeext