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annotate m4/mktime.m4 @ 11744:6fff409b3230

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mktime: correct setting of REPLACE_MKTIME * m4/mktime.m4 (gl_FUNC_MKTIME): Set REPLACE_MKTIME=0, when required.
author Jim Meyering <meyering@redhat.com>
date Wed, 29 Jul 2009 19:30:21 +0200
parents 531d4547f010
children e8d2c6fc33ad
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # serial 15
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2 dnl Copyright (C) 2002-2003, 2005-2007, 2009 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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7c1a6b73f48e An autoconf macro for its associated module.
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6
7c1a6b73f48e An autoconf macro for its associated module.
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7 dnl From Jim Meyering.
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8
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9 # Redefine AC_FUNC_MKTIME, to fix a bug in Autoconf 2.61a and earlier.
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10 # This redefinition can be removed once a new version of Autoconf is assumed.
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11 # The redefinition is taken from
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12 # <http://cvs.sv.gnu.org/viewcvs/*checkout*/autoconf/autoconf/lib/autoconf/functions.m4?rev=1.119>.
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13 # AC_FUNC_MKTIME
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14 # --------------
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15 AC_DEFUN([AC_FUNC_MKTIME],
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16 [AC_CHECK_HEADERS_ONCE([unistd.h])
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17 AC_CHECK_FUNCS_ONCE([alarm])
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18 AC_REQUIRE([gl_MULTIARCH])
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19 if test $APPLE_UNIVERSAL_BUILD = 1; then
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20 # A universal build on Apple MacOS X platforms.
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21 # The test result would be 'yes' in 32-bit mode and 'no' in 64-bit mode.
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22 # But we need a configuration result that is valid in both modes.
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23 ac_cv_func_working_mktime=no
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24 fi
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25 AC_CACHE_CHECK([for working mktime], [ac_cv_func_working_mktime],
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26 [AC_RUN_IFELSE([AC_LANG_SOURCE(
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27 [[/* Test program from Paul Eggert and Tony Leneis. */
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28 #include <limits.h>
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29 #include <stdlib.h>
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30 #include <time.h>
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31
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32 #ifdef HAVE_UNISTD_H
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33 # include <unistd.h>
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34 #endif
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35
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36 #ifndef HAVE_ALARM
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37 # define alarm(X) /* empty */
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38 #endif
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39
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40 /* Work around redefinition to rpl_putenv by other config tests. */
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41 #undef putenv
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42
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43 static time_t time_t_max;
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44 static time_t time_t_min;
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45
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46 /* Values we'll use to set the TZ environment variable. */
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47 static char *tz_strings[] = {
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48 (char *) 0, "TZ=GMT0", "TZ=JST-9",
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49 "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
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50 };
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51 #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
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52
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53 /* Return 0 if mktime fails to convert a date in the spring-forward gap.
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54 Based on a problem report from Andreas Jaeger. */
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55 static int
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56 spring_forward_gap ()
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57 {
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58 /* glibc (up to about 1998-10-07) failed this test. */
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59 struct tm tm;
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60
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61 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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62 instead of "TZ=America/Vancouver" in order to detect the bug even
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63 on systems that don't support the Olson extension, or don't have the
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64 full zoneinfo tables installed. */
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65 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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66
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67 tm.tm_year = 98;
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68 tm.tm_mon = 3;
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69 tm.tm_mday = 5;
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70 tm.tm_hour = 2;
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71 tm.tm_min = 0;
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72 tm.tm_sec = 0;
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73 tm.tm_isdst = -1;
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74 return mktime (&tm) != (time_t) -1;
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75 }
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76
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77 static int
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78 mktime_test1 (time_t now)
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79 {
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80 struct tm *lt;
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81 return ! (lt = localtime (&now)) || mktime (lt) == now;
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82 }
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83
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84 static int
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85 mktime_test (time_t now)
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86 {
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87 return (mktime_test1 (now)
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88 && mktime_test1 ((time_t) (time_t_max - now))
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89 && mktime_test1 ((time_t) (time_t_min + now)));
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90 }
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91
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92 static int
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93 irix_6_4_bug ()
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94 {
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95 /* Based on code from Ariel Faigon. */
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96 struct tm tm;
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97 tm.tm_year = 96;
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98 tm.tm_mon = 3;
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99 tm.tm_mday = 0;
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100 tm.tm_hour = 0;
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101 tm.tm_min = 0;
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102 tm.tm_sec = 0;
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103 tm.tm_isdst = -1;
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104 mktime (&tm);
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105 return tm.tm_mon == 2 && tm.tm_mday == 31;
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106 }
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107
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108 static int
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109 bigtime_test (int j)
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110 {
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111 struct tm tm;
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112 time_t now;
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113 tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
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114 now = mktime (&tm);
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115 if (now != (time_t) -1)
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116 {
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parents: 4107
diff changeset
117 struct tm *lt = localtime (&now);
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diff changeset
118 if (! (lt
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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119 && lt->tm_year == tm.tm_year
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120 && lt->tm_mon == tm.tm_mon
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121 && lt->tm_mday == tm.tm_mday
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122 && lt->tm_hour == tm.tm_hour
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parents: 4107
diff changeset
123 && lt->tm_min == tm.tm_min
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124 && lt->tm_sec == tm.tm_sec
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125 && lt->tm_yday == tm.tm_yday
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126 && lt->tm_wday == tm.tm_wday
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127 && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
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diff changeset
128 == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
7276
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129 return 0;
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130 }
7276
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131 return 1;
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diff changeset
132 }
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diff changeset
133
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
134 static int
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diff changeset
135 year_2050_test ()
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diff changeset
136 {
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
137 /* The correct answer for 2050-02-01 00:00:00 in Pacific time,
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parents: 6275
diff changeset
138 ignoring leap seconds. */
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diff changeset
139 unsigned long int answer = 2527315200UL;
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140
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diff changeset
141 struct tm tm;
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142 time_t t;
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143 tm.tm_year = 2050 - 1900;
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144 tm.tm_mon = 2 - 1;
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145 tm.tm_mday = 1;
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diff changeset
146 tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
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147 tm.tm_isdst = -1;
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148
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149 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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150 instead of "TZ=America/Vancouver" in order to detect the bug even
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diff changeset
151 on systems that don't support the Olson extension, or don't have the
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
152 full zoneinfo tables installed. */
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diff changeset
153 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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154
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diff changeset
155 t = mktime (&tm);
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diff changeset
156
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
157 /* Check that the result is either a failure, or close enough
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Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
158 to the correct answer that we can assume the discrepancy is
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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parents: 6275
diff changeset
159 due to leap seconds. */
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diff changeset
160 return (t == (time_t) -1
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
161 || (0 < t && answer - 120 <= t && t <= answer + 120));
4348
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162 }
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163
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
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164 int
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165 main ()
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166 {
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diff changeset
167 time_t t, delta;
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168 int i, j;
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169
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170 /* This test makes some buggy mktime implementations loop.
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171 Give up after 60 seconds; a mktime slower than that
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172 isn't worth using anyway. */
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diff changeset
173 alarm (60);
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174
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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diff changeset
175 for (;;)
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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diff changeset
176 {
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
177 t = (time_t_max << 1) + 1;
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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diff changeset
178 if (t <= time_t_max)
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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diff changeset
179 break;
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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diff changeset
180 time_t_max = t;
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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diff changeset
181 }
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
182 time_t_min = - ((time_t) ~ (time_t) 0 == (time_t) -1) - time_t_max;
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
183
4348
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diff changeset
184 delta = time_t_max / 997; /* a suitable prime number */
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
185 for (i = 0; i < N_STRINGS; i++)
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
186 {
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
187 if (tz_strings[i])
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
188 putenv (tz_strings[i]);
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
189
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
190 for (t = 0; t <= time_t_max - delta; t += delta)
7276
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
191 if (! mktime_test (t))
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
192 return 1;
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
193 if (! (mktime_test ((time_t) 1)
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
194 && mktime_test ((time_t) (60 * 60))
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
195 && mktime_test ((time_t) (60 * 60 * 24))))
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
196 return 1;
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
197
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
parents: 7276
diff changeset
198 for (j = 1; ; j <<= 1)
7276
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
199 if (! bigtime_test (j))
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
200 return 1;
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
parents: 7276
diff changeset
201 else if (INT_MAX / 2 < j)
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
parents: 7276
diff changeset
202 break;
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
parents: 7276
diff changeset
203 if (! bigtime_test (INT_MAX))
7276
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
204 return 1;
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
205 }
7276
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
206 return ! (irix_6_4_bug () && spring_forward_gap () && year_2050_test ());
4348
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
207 }]])],
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
208 [ac_cv_func_working_mktime=yes],
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
209 [ac_cv_func_working_mktime=no],
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
210 [ac_cv_func_working_mktime=no])])
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
211 if test $ac_cv_func_working_mktime = no; then
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
212 AC_LIBOBJ([mktime])
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
213 fi
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
214 ])# AC_FUNC_MKTIME
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
215
4107
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
216 AC_DEFUN([gl_FUNC_MKTIME],
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
217 [
11742
531d4547f010 Fix compilation error when <ctime> is used and mktime is replaced.
Bruno Haible <bruno@clisp.org>
parents: 11068
diff changeset
218 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
7942
9b53e406b401 2007-01-24 Bruno Haible <bruno@clisp.org>
Bruno Haible <bruno@clisp.org>
parents: 7906
diff changeset
219 AC_FUNC_MKTIME
11007
f6cba5a556ce many *.m4 files: improve m4 quoting
Jim Meyering <meyering@redhat.com>
parents: 8427
diff changeset
220 dnl Note: AC_FUNC_MKTIME does AC_LIBOBJ([mktime]).
4107
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
221 if test $ac_cv_func_working_mktime = no; then
11742
531d4547f010 Fix compilation error when <ctime> is used and mktime is replaced.
Bruno Haible <bruno@clisp.org>
parents: 11068
diff changeset
222 REPLACE_MKTIME=1
4107
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
223 gl_PREREQ_MKTIME
11744
6fff409b3230 mktime: correct setting of REPLACE_MKTIME
Jim Meyering <meyering@redhat.com>
parents: 11742
diff changeset
224 else
6fff409b3230 mktime: correct setting of REPLACE_MKTIME
Jim Meyering <meyering@redhat.com>
parents: 11742
diff changeset
225 REPLACE_MKTIME=0
4107
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
226 fi
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
227 ])
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
228
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
229 # Prerequisites of lib/mktime.c.
8427
8bd2ba354a25 mktime.c requires 'inline'.
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diff changeset
230 AC_DEFUN([gl_PREREQ_MKTIME],
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
parents: 7942
diff changeset
231 [
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
parents: 7942
diff changeset
232 AC_REQUIRE([AC_C_INLINE])
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
parents: 7942
diff changeset
233 ])