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annotate m4/mktime.m4 @ 8427:8bd2ba354a25

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mktime.c requires 'inline'.
author Bruno Haible <bruno@clisp.org>
date Sun, 11 Mar 2007 23:14:58 +0000
parents 9b53e406b401
children f6cba5a556ce
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8427
8bd2ba354a25 mktime.c requires 'inline'.
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1 #serial 13
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2 dnl Copyright (C) 2002, 2003, 2005, 2006, 2007 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.
7c1a6b73f48e An autoconf macro for its associated module.
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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_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
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19 [AC_RUN_IFELSE([AC_LANG_SOURCE(
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20 [[/* Test program from Paul Eggert and Tony Leneis. */
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21 #include <limits.h>
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22 #include <stdlib.h>
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23 #include <time.h>
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24
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25 #ifdef HAVE_UNISTD_H
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26 # include <unistd.h>
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27 #endif
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28
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29 #ifndef HAVE_ALARM
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30 # define alarm(X) /* empty */
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31 #endif
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32
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33 /* Work around redefinition to rpl_putenv by other config tests. */
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34 #undef putenv
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35
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36 static time_t time_t_max;
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37 static time_t time_t_min;
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38
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39 /* Values we'll use to set the TZ environment variable. */
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40 static char *tz_strings[] = {
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41 (char *) 0, "TZ=GMT0", "TZ=JST-9",
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42 "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
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43 };
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44 #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
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45
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46 /* Return 0 if mktime fails to convert a date in the spring-forward gap.
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47 Based on a problem report from Andreas Jaeger. */
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48 static int
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49 spring_forward_gap ()
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50 {
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51 /* glibc (up to about 1998-10-07) failed this test. */
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52 struct tm tm;
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53
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54 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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55 instead of "TZ=America/Vancouver" in order to detect the bug even
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56 on systems that don't support the Olson extension, or don't have the
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57 full zoneinfo tables installed. */
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58 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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59
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60 tm.tm_year = 98;
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61 tm.tm_mon = 3;
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62 tm.tm_mday = 5;
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63 tm.tm_hour = 2;
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64 tm.tm_min = 0;
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65 tm.tm_sec = 0;
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66 tm.tm_isdst = -1;
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67 return mktime (&tm) != (time_t) -1;
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68 }
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69
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70 static int
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71 mktime_test1 (now)
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72 time_t now;
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73 {
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74 struct tm *lt;
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75 return ! (lt = localtime (&now)) || mktime (lt) == now;
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76 }
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77
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78 static int
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79 mktime_test (now)
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80 time_t now;
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81 {
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82 return (mktime_test1 (now)
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83 && mktime_test1 ((time_t) (time_t_max - now))
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84 && mktime_test1 ((time_t) (time_t_min + now)));
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85 }
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86
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87 static int
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88 irix_6_4_bug ()
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89 {
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90 /* Based on code from Ariel Faigon. */
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91 struct tm tm;
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92 tm.tm_year = 96;
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93 tm.tm_mon = 3;
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94 tm.tm_mday = 0;
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95 tm.tm_hour = 0;
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96 tm.tm_min = 0;
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97 tm.tm_sec = 0;
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98 tm.tm_isdst = -1;
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99 mktime (&tm);
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100 return tm.tm_mon == 2 && tm.tm_mday == 31;
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101 }
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102
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103 static int
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104 bigtime_test (j)
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105 int j;
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106 {
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107 struct tm tm;
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108 time_t now;
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109 tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
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110 now = mktime (&tm);
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111 if (now != (time_t) -1)
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112 {
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113 struct tm *lt = localtime (&now);
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114 if (! (lt
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115 && lt->tm_year == tm.tm_year
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116 && lt->tm_mon == tm.tm_mon
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117 && lt->tm_mday == tm.tm_mday
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118 && lt->tm_hour == tm.tm_hour
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119 && lt->tm_min == tm.tm_min
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120 && lt->tm_sec == tm.tm_sec
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121 && lt->tm_yday == tm.tm_yday
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122 && lt->tm_wday == tm.tm_wday
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diff changeset
123 && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
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diff changeset
124 == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
7276
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125 return 0;
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126 }
7276
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127 return 1;
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128 }
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diff changeset
129
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130 static int
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diff changeset
131 year_2050_test ()
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132 {
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133 /* The correct answer for 2050-02-01 00:00:00 in Pacific time,
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134 ignoring leap seconds. */
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135 unsigned long int answer = 2527315200UL;
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136
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diff changeset
137 struct tm tm;
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138 time_t t;
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139 tm.tm_year = 2050 - 1900;
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140 tm.tm_mon = 2 - 1;
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141 tm.tm_mday = 1;
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142 tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
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143 tm.tm_isdst = -1;
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144
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145 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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diff changeset
146 instead of "TZ=America/Vancouver" in order to detect the bug even
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diff changeset
147 on systems that don't support the Olson extension, or don't have the
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diff changeset
148 full zoneinfo tables installed. */
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diff changeset
149 putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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150
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diff changeset
151 t = mktime (&tm);
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152
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153 /* Check that the result is either a failure, or close enough
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154 to the correct answer that we can assume the discrepancy is
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diff changeset
155 due to leap seconds. */
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156 return (t == (time_t) -1
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157 || (0 < t && answer - 120 <= t && t <= answer + 120));
4348
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158 }
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159
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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160 int
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161 main ()
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162 {
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163 time_t t, delta;
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164 int i, j;
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165
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166 /* This test makes some buggy mktime implementations loop.
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167 Give up after 60 seconds; a mktime slower than that
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168 isn't worth using anyway. */
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169 alarm (60);
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170
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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171 for (;;)
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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172 {
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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173 t = (time_t_max << 1) + 1;
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174 if (t <= time_t_max)
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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diff changeset
175 break;
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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176 time_t_max = t;
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177 }
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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178 time_t_min = - ((time_t) ~ (time_t) 0 == (time_t) -1) - time_t_max;
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179
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180 delta = time_t_max / 997; /* a suitable prime number */
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181 for (i = 0; i < N_STRINGS; i++)
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182 {
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diff changeset
183 if (tz_strings[i])
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diff changeset
184 putenv (tz_strings[i]);
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diff changeset
185
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diff changeset
186 for (t = 0; t <= time_t_max - delta; t += delta)
7276
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
187 if (! mktime_test (t))
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
188 return 1;
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
189 if (! (mktime_test ((time_t) 1)
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
190 && mktime_test ((time_t) (60 * 60))
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
191 && 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
192 return 1;
4348
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diff changeset
193
7734
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
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diff changeset
194 for (j = 1; ; j <<= 1)
7276
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
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diff changeset
195 if (! bigtime_test (j))
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;
7734
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
197 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
198 break;
6cc7c62f16f7 * m4/mktime.m4 (AC_FUNC_MKTIME): Sync from Autoconf.
Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
199 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
200 return 1;
4348
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diff changeset
201 }
7276
4be2c469b318 * config/srclist.txt: Temporarily comment out mktime.c until glibc bug
Paul Eggert <eggert@cs.ucla.edu>
parents: 6275
diff changeset
202 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
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diff changeset
203 }]])],
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
Paul Eggert <eggert@cs.ucla.edu>
parents: 4107
diff changeset
204 [ac_cv_func_working_mktime=yes],
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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parents: 4107
diff changeset
205 [ac_cv_func_working_mktime=no],
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
206 [ac_cv_func_working_mktime=no])])
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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parents: 4107
diff changeset
207 if test $ac_cv_func_working_mktime = no; then
fc8667232bcc Ensure we use gnulib mktime rather than glibc's mktime, on hosts
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diff changeset
208 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
209 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
210 ])# AC_FUNC_MKTIME
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diff changeset
211
4107
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
212 AC_DEFUN([gl_FUNC_MKTIME],
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
213 [
7942
9b53e406b401 2007-01-24 Bruno Haible <bruno@clisp.org>
Bruno Haible <bruno@clisp.org>
parents: 7906
diff changeset
214 AC_FUNC_MKTIME
9b53e406b401 2007-01-24 Bruno Haible <bruno@clisp.org>
Bruno Haible <bruno@clisp.org>
parents: 7906
diff changeset
215 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
216 if test $ac_cv_func_working_mktime = no; then
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
217 AC_DEFINE(mktime, rpl_mktime,
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
218 [Define to rpl_mktime if the replacement function should be used.])
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
219 gl_PREREQ_MKTIME
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
220 fi
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
221 ])
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
222
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
223 # Prerequisites of lib/mktime.c.
8427
8bd2ba354a25 mktime.c requires 'inline'.
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diff changeset
224 AC_DEFUN([gl_PREREQ_MKTIME],
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
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diff changeset
225 [
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
parents: 7942
diff changeset
226 AC_REQUIRE([AC_C_INLINE])
8bd2ba354a25 mktime.c requires 'inline'.
Bruno Haible <bruno@clisp.org>
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diff changeset
227 ])