235 lines
6.2 KiB
Plaintext
235 lines
6.2 KiB
Plaintext
# serial 15
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dnl Copyright (C) 2002-2003, 2005-2007, 2009-2010 Free Software Foundation,
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dnl Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Jim Meyering.
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# Redefine AC_FUNC_MKTIME, to fix a bug in Autoconf 2.61a and earlier.
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# This redefinition can be removed once a new version of Autoconf is assumed.
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# The redefinition is taken from
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# <http://cvs.sv.gnu.org/viewcvs/*checkout*/autoconf/autoconf/lib/autoconf/functions.m4?rev=1.119>.
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# AC_FUNC_MKTIME
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# --------------
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AC_DEFUN([AC_FUNC_MKTIME],
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[AC_CHECK_HEADERS_ONCE([unistd.h])
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AC_CHECK_FUNCS_ONCE([alarm])
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AC_REQUIRE([gl_MULTIARCH])
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if test $APPLE_UNIVERSAL_BUILD = 1; then
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# A universal build on Apple MacOS X platforms.
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# The test result would be 'yes' in 32-bit mode and 'no' in 64-bit mode.
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# But we need a configuration result that is valid in both modes.
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ac_cv_func_working_mktime=no
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fi
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AC_CACHE_CHECK([for working mktime], [ac_cv_func_working_mktime],
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[AC_RUN_IFELSE([AC_LANG_SOURCE(
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[[/* Test program from Paul Eggert and Tony Leneis. */
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#include <limits.h>
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#include <stdlib.h>
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#include <time.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifndef HAVE_ALARM
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# define alarm(X) /* empty */
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#endif
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/* Work around redefinition to rpl_putenv by other config tests. */
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#undef putenv
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static time_t time_t_max;
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static time_t time_t_min;
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/* Values we'll use to set the TZ environment variable. */
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static char *tz_strings[] = {
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(char *) 0, "TZ=GMT0", "TZ=JST-9",
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"TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
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};
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#define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
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/* Return 0 if mktime fails to convert a date in the spring-forward gap.
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Based on a problem report from Andreas Jaeger. */
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static int
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spring_forward_gap ()
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{
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/* glibc (up to about 1998-10-07) failed this test. */
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struct tm tm;
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/* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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instead of "TZ=America/Vancouver" in order to detect the bug even
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on systems that don't support the Olson extension, or don't have the
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full zoneinfo tables installed. */
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putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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tm.tm_year = 98;
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tm.tm_mon = 3;
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tm.tm_mday = 5;
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tm.tm_hour = 2;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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tm.tm_isdst = -1;
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return mktime (&tm) != (time_t) -1;
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}
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static int
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mktime_test1 (time_t now)
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{
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struct tm *lt;
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return ! (lt = localtime (&now)) || mktime (lt) == now;
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}
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static int
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mktime_test (time_t now)
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{
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return (mktime_test1 (now)
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&& mktime_test1 ((time_t) (time_t_max - now))
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&& mktime_test1 ((time_t) (time_t_min + now)));
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}
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static int
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irix_6_4_bug ()
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{
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/* Based on code from Ariel Faigon. */
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struct tm tm;
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tm.tm_year = 96;
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tm.tm_mon = 3;
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tm.tm_mday = 0;
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tm.tm_hour = 0;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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tm.tm_isdst = -1;
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mktime (&tm);
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return tm.tm_mon == 2 && tm.tm_mday == 31;
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}
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static int
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bigtime_test (int j)
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{
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struct tm tm;
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time_t now;
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tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
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now = mktime (&tm);
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if (now != (time_t) -1)
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{
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struct tm *lt = localtime (&now);
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if (! (lt
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&& lt->tm_year == tm.tm_year
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&& lt->tm_mon == tm.tm_mon
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&& lt->tm_mday == tm.tm_mday
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&& lt->tm_hour == tm.tm_hour
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&& lt->tm_min == tm.tm_min
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&& lt->tm_sec == tm.tm_sec
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&& lt->tm_yday == tm.tm_yday
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&& lt->tm_wday == tm.tm_wday
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&& ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
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== (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
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return 0;
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}
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return 1;
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}
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static int
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year_2050_test ()
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{
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/* The correct answer for 2050-02-01 00:00:00 in Pacific time,
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ignoring leap seconds. */
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unsigned long int answer = 2527315200UL;
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struct tm tm;
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time_t t;
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tm.tm_year = 2050 - 1900;
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tm.tm_mon = 2 - 1;
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tm.tm_mday = 1;
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tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
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tm.tm_isdst = -1;
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/* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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instead of "TZ=America/Vancouver" in order to detect the bug even
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on systems that don't support the Olson extension, or don't have the
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full zoneinfo tables installed. */
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putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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t = mktime (&tm);
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/* Check that the result is either a failure, or close enough
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to the correct answer that we can assume the discrepancy is
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due to leap seconds. */
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return (t == (time_t) -1
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|| (0 < t && answer - 120 <= t && t <= answer + 120));
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}
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int
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main ()
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{
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time_t t, delta;
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int i, j;
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/* This test makes some buggy mktime implementations loop.
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Give up after 60 seconds; a mktime slower than that
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isn't worth using anyway. */
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alarm (60);
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for (;;)
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{
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t = (time_t_max << 1) + 1;
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if (t <= time_t_max)
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break;
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time_t_max = t;
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}
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time_t_min = - ((time_t) ~ (time_t) 0 == (time_t) -1) - time_t_max;
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delta = time_t_max / 997; /* a suitable prime number */
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for (i = 0; i < N_STRINGS; i++)
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{
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if (tz_strings[i])
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putenv (tz_strings[i]);
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for (t = 0; t <= time_t_max - delta; t += delta)
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if (! mktime_test (t))
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return 1;
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if (! (mktime_test ((time_t) 1)
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&& mktime_test ((time_t) (60 * 60))
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&& mktime_test ((time_t) (60 * 60 * 24))))
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return 1;
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for (j = 1; ; j <<= 1)
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if (! bigtime_test (j))
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return 1;
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else if (INT_MAX / 2 < j)
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break;
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if (! bigtime_test (INT_MAX))
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return 1;
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}
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return ! (irix_6_4_bug () && spring_forward_gap () && year_2050_test ());
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}]])],
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[ac_cv_func_working_mktime=yes],
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[ac_cv_func_working_mktime=no],
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[ac_cv_func_working_mktime=no])])
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if test $ac_cv_func_working_mktime = no; then
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AC_LIBOBJ([mktime])
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fi
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])# AC_FUNC_MKTIME
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AC_DEFUN([gl_FUNC_MKTIME],
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[
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AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
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AC_FUNC_MKTIME
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dnl Note: AC_FUNC_MKTIME does AC_LIBOBJ([mktime]).
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if test $ac_cv_func_working_mktime = no; then
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REPLACE_MKTIME=1
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gl_PREREQ_MKTIME
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else
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REPLACE_MKTIME=0
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fi
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])
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# Prerequisites of lib/mktime.c.
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AC_DEFUN([gl_PREREQ_MKTIME],
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[
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AC_REQUIRE([AC_C_INLINE])
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])
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