From a91b95cca2d397c84f8b9bbd602d40209a7092ce Mon Sep 17 00:00:00 2001
From: Andy Wingo <wingo@pobox.com>
Date: Wed, 20 Jan 2021 21:52:54 +0100
Subject: Update Gnulib to v0.1-4379-g2ef5a9b4b

Also bump required autoconf version to 2.64, as required by Gnulib.
---
 m4/time_rz.m4 | 38 +++++++++++++++++++++++++++++++++++---
 1 file changed, 35 insertions(+), 3 deletions(-)

(limited to 'm4/time_rz.m4')

diff --git a/m4/time_rz.m4 b/m4/time_rz.m4
index 79060e00f..34ef0bab4 100644
--- a/m4/time_rz.m4
+++ b/m4/time_rz.m4
@@ -1,6 +1,6 @@
 dnl Time zone functions: tzalloc, localtime_rz, etc.
 
-dnl Copyright (C) 2015-2017 Free Software Foundation, Inc.
+dnl Copyright (C) 2015-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -10,9 +10,41 @@ dnl Written by Paul Eggert.
 AC_DEFUN([gl_TIME_RZ],
 [
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
+  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
   AC_REQUIRE([AC_STRUCT_TIMEZONE])
-  AC_CHECK_FUNCS_ONCE([tzset])
+
+  # On Mac OS X 10.6, localtime loops forever with some time_t values.
+  # See Bug#27706, Bug#27736, and
+  # https://lists.gnu.org/r/bug-gnulib/2017-07/msg00142.html
+  AC_CACHE_CHECK([whether localtime works even near extrema],
+    [gl_cv_func_localtime_works],
+    [gl_cv_func_localtime_works=yes
+     AC_RUN_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <stdlib.h>
+            #include <string.h>
+            #include <unistd.h>
+            #include <time.h>
+          ]], [[
+            time_t t = -67768038400666600;
+            struct tm *tm;
+            char *tz = getenv ("TZ");
+            if (! (tz && strcmp (tz, "QQQ0") == 0))
+              return 0;
+            alarm (2);
+            tm = localtime (&t);
+            /* Use TM and *TM to suppress over-optimization.  */
+            return tm && tm->tm_isdst;
+          ]])],
+       [(TZ=QQQ0 ./conftest$EXEEXT) >/dev/null 2>&1 ||
+           gl_cv_func_localtime_works=no],
+       [],
+       [gl_cv_func_localtime_works="guessing yes"])])
+  if test "$gl_cv_func_localtime_works" = no; then
+      AC_DEFINE([HAVE_LOCALTIME_INFLOOP_BUG], 1,
+        [Define if localtime-like functions can loop forever on
+         extreme arguments.])
+  fi
 
   AC_CHECK_TYPES([timezone_t], [], [], [[#include <time.h>]])
   if test "$ac_cv_type_timezone_t" = yes; then
-- 
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