319 lines
8.9 KiB
Text
319 lines
8.9 KiB
Text
# serial 37
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dnl Copyright (C) 2002-2003, 2005-2007, 2009-2023 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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AC_DEFUN([gl_TIME_T_IS_SIGNED],
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[
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AC_CACHE_CHECK([whether time_t is signed],
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[gl_cv_time_t_is_signed],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[#include <time.h>
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char time_t_signed[(time_t) -1 < 0 ? 1 : -1];]])],
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[gl_cv_time_t_is_signed=yes],
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[gl_cv_time_t_is_signed=no])])
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if test $gl_cv_time_t_is_signed = yes; then
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AC_DEFINE([TIME_T_IS_SIGNED], [1], [Define to 1 if time_t is signed.])
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fi
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])
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dnl Test whether mktime works. Set gl_cv_func_working_mktime.
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AC_DEFUN([gl_FUNC_MKTIME_WORKS],
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[
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AC_REQUIRE([gl_TIME_T_IS_SIGNED])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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dnl We don't use AC_FUNC_MKTIME any more, because it is no longer maintained
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dnl in Autoconf and because it invokes AC_LIBOBJ.
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AC_CHECK_HEADERS_ONCE([unistd.h])
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AC_CHECK_DECLS_ONCE([alarm])
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AC_REQUIRE([gl_MULTIARCH])
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AC_CACHE_CHECK([for working mktime], [gl_cv_func_working_mktime],
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[if test $APPLE_UNIVERSAL_BUILD = 1; then
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# A universal build on Apple Mac OS 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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gl_cv_func_working_mktime="guessing no"
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else
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AC_RUN_IFELSE(
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[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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#if HAVE_DECL_ALARM
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# include <signal.h>
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#endif
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]GL_MDA_DEFINES[
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#ifndef TIME_T_IS_SIGNED
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# define TIME_T_IS_SIGNED 0
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#endif
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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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if (putenv ("TZ=PST8PDT,M4.1.0,M10.5.0") != 0)
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return -1;
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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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if (putenv ("TZ=PST8PDT,M4.1.0,M10.5.0") != 0)
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return -1;
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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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static int
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indiana_test ()
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{
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if (putenv ("TZ=America/Indiana/Indianapolis") != 0)
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return -1;
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struct tm tm;
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tm.tm_year = 1986 - 1900; tm.tm_mon = 4 - 1; tm.tm_mday = 28;
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tm.tm_hour = 16; tm.tm_min = 24; tm.tm_sec = 50; tm.tm_isdst = 0;
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time_t std = mktime (&tm);
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if (! (std == 515107490 || std == 515107503))
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return 1;
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/* This platform supports TZDB, either without or with leap seconds.
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Return true if GNU Bug#48085 is absent. */
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tm.tm_isdst = 1;
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time_t dst = mktime (&tm);
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return std - dst == 60 * 60;
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}
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int
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main ()
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{
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int result = 0;
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time_t t, delta;
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int i, j;
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int time_t_signed_magnitude = (time_t) ~ (time_t) 0 < (time_t) -1;
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#if HAVE_DECL_ALARM
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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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signal (SIGALRM, SIG_DFL);
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alarm (60);
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#endif
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time_t_max = (! TIME_T_IS_SIGNED
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? (time_t) -1
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: ((((time_t) 1 << (sizeof (time_t) * CHAR_BIT - 2)) - 1)
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* 2 + 1));
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time_t_min = (! TIME_T_IS_SIGNED
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? (time_t) 0
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: time_t_signed_magnitude
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? ~ (time_t) 0
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: ~ 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 && (result & 1) == 0; t += delta)
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if (! mktime_test (t))
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result |= 1;
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if ((result & 2) == 0
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&& ! (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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result |= 2;
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for (j = 1; (result & 4) == 0; j <<= 1)
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{
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if (! bigtime_test (j))
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result |= 4;
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if (INT_MAX / 2 < j)
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break;
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}
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if ((result & 8) == 0 && ! bigtime_test (INT_MAX))
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result |= 8;
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}
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if (! irix_6_4_bug ())
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result |= 16;
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if (! spring_forward_gap ())
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result |= 32;
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if (! year_2050_test () || ! indiana_test ())
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result |= 64;
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return result;
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}]])],
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[gl_cv_func_working_mktime=yes],
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[gl_cv_func_working_mktime=no],
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[case "$host_os" in
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# Guess no on native Windows.
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mingw*) gl_cv_func_working_mktime="guessing no" ;;
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*) gl_cv_func_working_mktime="$gl_cross_guess_normal" ;;
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esac
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])
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fi
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])
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])
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dnl Main macro of module 'mktime'.
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AC_DEFUN([gl_FUNC_MKTIME],
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[
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AC_REQUIRE([gl_TIME_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_REQUIRE([gl_FUNC_MKTIME_WORKS])
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REPLACE_MKTIME=0
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if test "$gl_cv_func_working_mktime" != yes; then
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REPLACE_MKTIME=1
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AC_DEFINE([NEED_MKTIME_WORKING], [1],
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[Define if the compilation of mktime.c should define 'mktime'
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with the algorithmic workarounds.])
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fi
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case "$host_os" in
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mingw*)
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REPLACE_MKTIME=1
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AC_DEFINE([NEED_MKTIME_WINDOWS], [1],
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[Define if the compilation of mktime.c should define 'mktime'
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with the native Windows TZ workaround.])
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;;
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esac
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])
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dnl Main macro of module 'mktime-internal'.
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AC_DEFUN([gl_FUNC_MKTIME_INTERNAL], [
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AC_REQUIRE([gl_FUNC_MKTIME_WORKS])
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WANT_MKTIME_INTERNAL=0
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dnl BeOS has __mktime_internal in libc, but other platforms don't.
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AC_CHECK_FUNC([__mktime_internal],
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[AC_DEFINE([mktime_internal], [__mktime_internal],
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[Define to the real name of the mktime_internal function.])
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],
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[dnl mktime works but it doesn't export __mktime_internal,
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dnl so we need to substitute our own mktime implementation.
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WANT_MKTIME_INTERNAL=1
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AC_DEFINE([NEED_MKTIME_INTERNAL], [1],
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[Define if the compilation of mktime.c should define 'mktime_internal'.])
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])
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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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