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1fd182f0 PE |
1 | # serial 17 |
2 | dnl Copyright (C) 2002-2003, 2005-2007, 2009-2011 Free Software Foundation, | |
3 | dnl Inc. | |
4 | dnl This file is free software; the Free Software Foundation | |
5 | dnl gives unlimited permission to copy and/or distribute it, | |
6 | dnl with or without modifications, as long as this notice is preserved. | |
7 | ||
8 | dnl From Jim Meyering. | |
9 | ||
10 | # Redefine AC_FUNC_MKTIME, because it is no longer maintained in Autoconf. | |
11 | # AC_FUNC_MKTIME | |
12 | # -------------- | |
13 | AC_DEFUN([AC_FUNC_MKTIME], | |
14 | [AC_CHECK_HEADERS_ONCE([unistd.h]) | |
15 | AC_CHECK_FUNCS_ONCE([alarm]) | |
16 | AC_REQUIRE([gl_MULTIARCH]) | |
17 | if test $APPLE_UNIVERSAL_BUILD = 1; then | |
18 | # A universal build on Apple MacOS X platforms. | |
19 | # The test result would be 'yes' in 32-bit mode and 'no' in 64-bit mode. | |
20 | # But we need a configuration result that is valid in both modes. | |
21 | ac_cv_func_working_mktime=no | |
22 | fi | |
23 | AC_CACHE_CHECK([for working mktime], [ac_cv_func_working_mktime], | |
24 | [AC_RUN_IFELSE([AC_LANG_SOURCE( | |
25 | [[/* Test program from Paul Eggert and Tony Leneis. */ | |
26 | #include <limits.h> | |
27 | #include <stdlib.h> | |
28 | #include <time.h> | |
29 | ||
30 | #ifdef HAVE_UNISTD_H | |
31 | # include <unistd.h> | |
32 | #endif | |
33 | ||
34 | #ifndef HAVE_ALARM | |
35 | # define alarm(X) /* empty */ | |
36 | #endif | |
37 | ||
38 | /* Work around redefinition to rpl_putenv by other config tests. */ | |
39 | #undef putenv | |
40 | ||
41 | static time_t time_t_max; | |
42 | static time_t time_t_min; | |
43 | ||
44 | /* Values we'll use to set the TZ environment variable. */ | |
45 | static char *tz_strings[] = { | |
46 | (char *) 0, "TZ=GMT0", "TZ=JST-9", | |
47 | "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00" | |
48 | }; | |
49 | #define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0])) | |
50 | ||
51 | /* Return 0 if mktime fails to convert a date in the spring-forward gap. | |
52 | Based on a problem report from Andreas Jaeger. */ | |
53 | static int | |
54 | spring_forward_gap () | |
55 | { | |
56 | /* glibc (up to about 1998-10-07) failed this test. */ | |
57 | struct tm tm; | |
58 | ||
59 | /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0" | |
60 | instead of "TZ=America/Vancouver" in order to detect the bug even | |
61 | on systems that don't support the Olson extension, or don't have the | |
62 | full zoneinfo tables installed. */ | |
63 | putenv ("TZ=PST8PDT,M4.1.0,M10.5.0"); | |
64 | ||
65 | tm.tm_year = 98; | |
66 | tm.tm_mon = 3; | |
67 | tm.tm_mday = 5; | |
68 | tm.tm_hour = 2; | |
69 | tm.tm_min = 0; | |
70 | tm.tm_sec = 0; | |
71 | tm.tm_isdst = -1; | |
72 | return mktime (&tm) != (time_t) -1; | |
73 | } | |
74 | ||
75 | static int | |
76 | mktime_test1 (time_t now) | |
77 | { | |
78 | struct tm *lt; | |
79 | return ! (lt = localtime (&now)) || mktime (lt) == now; | |
80 | } | |
81 | ||
82 | static int | |
83 | mktime_test (time_t now) | |
84 | { | |
85 | return (mktime_test1 (now) | |
86 | && mktime_test1 ((time_t) (time_t_max - now)) | |
87 | && mktime_test1 ((time_t) (time_t_min + now))); | |
88 | } | |
89 | ||
90 | static int | |
91 | irix_6_4_bug () | |
92 | { | |
93 | /* Based on code from Ariel Faigon. */ | |
94 | struct tm tm; | |
95 | tm.tm_year = 96; | |
96 | tm.tm_mon = 3; | |
97 | tm.tm_mday = 0; | |
98 | tm.tm_hour = 0; | |
99 | tm.tm_min = 0; | |
100 | tm.tm_sec = 0; | |
101 | tm.tm_isdst = -1; | |
102 | mktime (&tm); | |
103 | return tm.tm_mon == 2 && tm.tm_mday == 31; | |
104 | } | |
105 | ||
106 | static int | |
107 | bigtime_test (int j) | |
108 | { | |
109 | struct tm tm; | |
110 | time_t now; | |
111 | tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j; | |
112 | now = mktime (&tm); | |
113 | if (now != (time_t) -1) | |
114 | { | |
115 | struct tm *lt = localtime (&now); | |
116 | if (! (lt | |
117 | && lt->tm_year == tm.tm_year | |
118 | && lt->tm_mon == tm.tm_mon | |
119 | && lt->tm_mday == tm.tm_mday | |
120 | && lt->tm_hour == tm.tm_hour | |
121 | && lt->tm_min == tm.tm_min | |
122 | && lt->tm_sec == tm.tm_sec | |
123 | && lt->tm_yday == tm.tm_yday | |
124 | && lt->tm_wday == tm.tm_wday | |
125 | && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst) | |
126 | == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst)))) | |
127 | return 0; | |
128 | } | |
129 | return 1; | |
130 | } | |
131 | ||
132 | static int | |
133 | year_2050_test () | |
134 | { | |
135 | /* The correct answer for 2050-02-01 00:00:00 in Pacific time, | |
136 | ignoring leap seconds. */ | |
137 | unsigned long int answer = 2527315200UL; | |
138 | ||
139 | struct tm tm; | |
140 | time_t t; | |
141 | tm.tm_year = 2050 - 1900; | |
142 | tm.tm_mon = 2 - 1; | |
143 | tm.tm_mday = 1; | |
144 | tm.tm_hour = tm.tm_min = tm.tm_sec = 0; | |
145 | tm.tm_isdst = -1; | |
146 | ||
147 | /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0" | |
148 | instead of "TZ=America/Vancouver" in order to detect the bug even | |
149 | on systems that don't support the Olson extension, or don't have the | |
150 | full zoneinfo tables installed. */ | |
151 | putenv ("TZ=PST8PDT,M4.1.0,M10.5.0"); | |
152 | ||
153 | t = mktime (&tm); | |
154 | ||
155 | /* Check that the result is either a failure, or close enough | |
156 | to the correct answer that we can assume the discrepancy is | |
157 | due to leap seconds. */ | |
158 | return (t == (time_t) -1 | |
159 | || (0 < t && answer - 120 <= t && t <= answer + 120)); | |
160 | } | |
161 | ||
162 | int | |
163 | main () | |
164 | { | |
165 | int result = 0; | |
166 | time_t t, delta; | |
167 | int i, j; | |
168 | ||
169 | /* This test makes some buggy mktime implementations loop. | |
170 | Give up after 60 seconds; a mktime slower than that | |
171 | isn't worth using anyway. */ | |
172 | alarm (60); | |
173 | ||
174 | for (;;) | |
175 | { | |
176 | t = (time_t_max << 1) + 1; | |
177 | if (t <= time_t_max) | |
178 | break; | |
179 | time_t_max = t; | |
180 | } | |
181 | time_t_min = - ((time_t) ~ (time_t) 0 == (time_t) -1) - time_t_max; | |
182 | ||
183 | delta = time_t_max / 997; /* a suitable prime number */ | |
184 | for (i = 0; i < N_STRINGS; i++) | |
185 | { | |
186 | if (tz_strings[i]) | |
187 | putenv (tz_strings[i]); | |
188 | ||
189 | for (t = 0; t <= time_t_max - delta; t += delta) | |
190 | if (! mktime_test (t)) | |
191 | result |= 1; | |
192 | if (! (mktime_test ((time_t) 1) | |
193 | && mktime_test ((time_t) (60 * 60)) | |
194 | && mktime_test ((time_t) (60 * 60 * 24)))) | |
195 | result |= 2; | |
196 | ||
197 | for (j = 1; ; j <<= 1) | |
198 | if (! bigtime_test (j)) | |
199 | result |= 4; | |
200 | else if (INT_MAX / 2 < j) | |
201 | break; | |
202 | if (! bigtime_test (INT_MAX)) | |
203 | result |= 8; | |
204 | } | |
205 | if (! irix_6_4_bug ()) | |
206 | result |= 16; | |
207 | if (! spring_forward_gap ()) | |
208 | result |= 32; | |
209 | if (! year_2050_test ()) | |
210 | result |= 64; | |
211 | return result; | |
212 | }]])], | |
213 | [ac_cv_func_working_mktime=yes], | |
214 | [ac_cv_func_working_mktime=no], | |
215 | [ac_cv_func_working_mktime=no])]) | |
216 | if test $ac_cv_func_working_mktime = no; then | |
217 | AC_LIBOBJ([mktime]) | |
218 | fi | |
219 | ])# AC_FUNC_MKTIME | |
220 | ||
221 | AC_DEFUN([gl_FUNC_MKTIME], | |
222 | [ | |
223 | AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS]) | |
224 | AC_FUNC_MKTIME | |
225 | dnl Note: AC_FUNC_MKTIME does AC_LIBOBJ([mktime]). | |
226 | if test $ac_cv_func_working_mktime = no; then | |
227 | REPLACE_MKTIME=1 | |
228 | gl_PREREQ_MKTIME | |
229 | else | |
230 | REPLACE_MKTIME=0 | |
231 | fi | |
232 | ]) | |
233 | ||
234 | # Prerequisites of lib/mktime.c. | |
235 | AC_DEFUN([gl_PREREQ_MKTIME], | |
236 | [ | |
237 | AC_REQUIRE([AC_C_INLINE]) | |
238 | ]) |