X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fmktime.m4;h=94ed67f7060b317ac0ec6ea7f8b2a21833c05dd4;hb=ab925242c495050cda536f918ff4d5118798505a;hp=085cf7e9ae4f6d5d0a8ec8fee83592363f6ba0a6;hpb=a8bebfc00110b3201ac612a1979be1358da912b5;p=gnulib.git

diff --git a/m4/mktime.m4 b/m4/mktime.m4
index 085cf7e9a..94ed67f70 100644
--- a/m4/mktime.m4
+++ b/m4/mktime.m4
@@ -1,18 +1,26 @@
-#serial 1000
-
-dnl From Paul Eggert
-dnl Check for a working mktime.
-dnl This is a preview of what should appear in the next public autoconf release.
-
-AC_DEFUN(AC_FUNC_MKTIME,
+# mktime.m4 serial 4
+dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+dnl From Jim Meyering.
+
+# Redefine AC_FUNC_MKTIME, to fix a bug in Autoconf 2.57 and earlier.
+# This redefinition can be removed once a new version of Autoconf comes out.
+# The redefinition is taken from
+# <http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/autoconf/autoconf/lib/autoconf/functions.m4?rev=1.78>.
+# AC_FUNC_MKTIME
+# --------------
+AC_DEFUN([AC_FUNC_MKTIME],
 [AC_REQUIRE([AC_HEADER_TIME])dnl
-AC_CHECK_HEADERS(sys/time.h unistd.h)
+AC_CHECK_HEADERS(stdlib.h sys/time.h unistd.h)
 AC_CHECK_FUNCS(alarm)
 AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
-[AC_TRY_RUN(
-changequote(<<, >>)dnl
-<</* Test program from Paul Eggert (eggert@twinsun.com)
-   and Tony Leneis (tony@plaza.ds.adp.com).  */
+[AC_RUN_IFELSE([AC_LANG_SOURCE(
+[[/* Test program from Paul Eggert and Tony Leneis.  */
 #if TIME_WITH_SYS_TIME
 # include <sys/time.h>
 # include <time.h>
@@ -24,6 +32,10 @@ changequote(<<, >>)dnl
 # endif
 #endif
 
+#if HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+
 #if HAVE_UNISTD_H
 # include <unistd.h>
 #endif
@@ -36,10 +48,11 @@ changequote(<<, >>)dnl
 #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[] = {
-  (const char *) 0, "TZ=GMT0", "TZ=JST-9",
+static char *tz_strings[] = {
+  (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]))
@@ -49,7 +62,7 @@ static const char *const tz_strings[] = {
 static void
 spring_forward_gap ()
 {
-  /* glibc (up to about 1998-10-07) failed this test) */
+  /* 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"
@@ -70,15 +83,21 @@ spring_forward_gap ()
 }
 
 static void
-mktime_test (now)
+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);
+}
+
+static void
+mktime_test (now)
+     time_t now;
+{
+  mktime_test1 (now);
+  mktime_test1 ((time_t) (time_t_max - now));
+  mktime_test1 ((time_t) (time_t_min + now));
 }
 
 static void
@@ -138,6 +157,9 @@ main ()
   for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
     continue;
   time_t_max--;
+  if ((time_t) -1 < 0)
+    for (time_t_min = -1; (time_t) (time_t_min * 2) < 0; time_t_min *= 2)
+      continue;
   delta = time_t_max / 997; /* a suitable prime number */
   for (i = 0; i < N_STRINGS; i++)
     {
@@ -146,22 +168,35 @@ main ()
 
       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);
+      mktime_test ((time_t) 1);
+      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);
       bigtime_test (j - 1);
     }
   irix_6_4_bug ();
   spring_forward_gap ();
   exit (0);
-}
->>,
-changequote([, ])dnl
-ac_cv_func_working_mktime=yes, ac_cv_func_working_mktime=no,
-ac_cv_func_working_mktime=no)])
+}]])],
+	       [ac_cv_func_working_mktime=yes],
+	       [ac_cv_func_working_mktime=no],
+	       [ac_cv_func_working_mktime=no])])
 if test $ac_cv_func_working_mktime = no; then
-  LIBOBJS="$LIBOBJS mktime.${ac_objext}"
+  AC_LIBOBJ([mktime])
 fi
+])# AC_FUNC_MKTIME
+
+AC_DEFUN([gl_FUNC_MKTIME],
+[
+  AC_REQUIRE([AC_FUNC_MKTIME])
+  if test $ac_cv_func_working_mktime = no; then
+    AC_DEFINE(mktime, rpl_mktime,
+      [Define to rpl_mktime if the replacement function should be used.])
+    gl_PREREQ_MKTIME
+  fi
 ])
+
+# Prerequisites of lib/mktime.c.
+AC_DEFUN([gl_PREREQ_MKTIME], [:])