320 lines
8.9 KiB
Plaintext
320 lines
8.9 KiB
Plaintext
# serial 37
|
|
dnl Copyright (C) 2002-2003, 2005-2007, 2009-2023 Free Software Foundation,
|
|
dnl Inc.
|
|
dnl This file is free software; the Free Software Foundation
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
|
dnl with or without modifications, as long as this notice is preserved.
|
|
|
|
dnl From Jim Meyering.
|
|
|
|
AC_DEFUN([gl_TIME_T_IS_SIGNED],
|
|
[
|
|
AC_CACHE_CHECK([whether time_t is signed],
|
|
[gl_cv_time_t_is_signed],
|
|
[AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM([[#include <time.h>
|
|
char time_t_signed[(time_t) -1 < 0 ? 1 : -1];]])],
|
|
[gl_cv_time_t_is_signed=yes],
|
|
[gl_cv_time_t_is_signed=no])])
|
|
if test $gl_cv_time_t_is_signed = yes; then
|
|
AC_DEFINE([TIME_T_IS_SIGNED], [1], [Define to 1 if time_t is signed.])
|
|
fi
|
|
])
|
|
|
|
dnl Test whether mktime works. Set gl_cv_func_working_mktime.
|
|
AC_DEFUN([gl_FUNC_MKTIME_WORKS],
|
|
[
|
|
AC_REQUIRE([gl_TIME_T_IS_SIGNED])
|
|
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
|
|
|
|
dnl We don't use AC_FUNC_MKTIME any more, because it is no longer maintained
|
|
dnl in Autoconf and because it invokes AC_LIBOBJ.
|
|
AC_CHECK_HEADERS_ONCE([unistd.h])
|
|
AC_CHECK_DECLS_ONCE([alarm])
|
|
AC_REQUIRE([gl_MULTIARCH])
|
|
AC_CACHE_CHECK([for working mktime], [gl_cv_func_working_mktime],
|
|
[if test $APPLE_UNIVERSAL_BUILD = 1; then
|
|
# A universal build on Apple Mac OS X platforms.
|
|
# The test result would be 'yes' in 32-bit mode and 'no' in 64-bit mode.
|
|
# But we need a configuration result that is valid in both modes.
|
|
gl_cv_func_working_mktime="guessing no"
|
|
else
|
|
AC_RUN_IFELSE(
|
|
[AC_LANG_SOURCE(
|
|
[[/* Test program from Paul Eggert and Tony Leneis. */
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
|
|
#ifdef HAVE_UNISTD_H
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
#if HAVE_DECL_ALARM
|
|
# include <signal.h>
|
|
#endif
|
|
|
|
]GL_MDA_DEFINES[
|
|
|
|
#ifndef TIME_T_IS_SIGNED
|
|
# define TIME_T_IS_SIGNED 0
|
|
#endif
|
|
|
|
static time_t time_t_max;
|
|
static time_t time_t_min;
|
|
|
|
/* Values we'll use to set the TZ environment variable. */
|
|
static char *tz_strings[] = {
|
|
(char *) 0, "TZ=GMT0", "TZ=JST-9",
|
|
"TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
|
|
};
|
|
#define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
|
|
|
|
/* Return 0 if mktime fails to convert a date in the spring-forward gap.
|
|
Based on a problem report from Andreas Jaeger. */
|
|
static int
|
|
spring_forward_gap ()
|
|
{
|
|
/* glibc (up to about 1998-10-07) failed this test. */
|
|
struct tm tm;
|
|
|
|
/* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
|
|
instead of "TZ=America/Vancouver" in order to detect the bug even
|
|
on systems that don't support the Olson extension, or don't have the
|
|
full zoneinfo tables installed. */
|
|
if (putenv ("TZ=PST8PDT,M4.1.0,M10.5.0") != 0)
|
|
return -1;
|
|
|
|
tm.tm_year = 98;
|
|
tm.tm_mon = 3;
|
|
tm.tm_mday = 5;
|
|
tm.tm_hour = 2;
|
|
tm.tm_min = 0;
|
|
tm.tm_sec = 0;
|
|
tm.tm_isdst = -1;
|
|
return mktime (&tm) != (time_t) -1;
|
|
}
|
|
|
|
static int
|
|
mktime_test1 (time_t now)
|
|
{
|
|
struct tm *lt;
|
|
return ! (lt = localtime (&now)) || mktime (lt) == now;
|
|
}
|
|
|
|
static int
|
|
mktime_test (time_t now)
|
|
{
|
|
return (mktime_test1 (now)
|
|
&& mktime_test1 ((time_t) (time_t_max - now))
|
|
&& mktime_test1 ((time_t) (time_t_min + now)));
|
|
}
|
|
|
|
static int
|
|
irix_6_4_bug ()
|
|
{
|
|
/* Based on code from Ariel Faigon. */
|
|
struct tm tm;
|
|
tm.tm_year = 96;
|
|
tm.tm_mon = 3;
|
|
tm.tm_mday = 0;
|
|
tm.tm_hour = 0;
|
|
tm.tm_min = 0;
|
|
tm.tm_sec = 0;
|
|
tm.tm_isdst = -1;
|
|
mktime (&tm);
|
|
return tm.tm_mon == 2 && tm.tm_mday == 31;
|
|
}
|
|
|
|
static int
|
|
bigtime_test (int j)
|
|
{
|
|
struct tm tm;
|
|
time_t now;
|
|
tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
|
|
now = mktime (&tm);
|
|
if (now != (time_t) -1)
|
|
{
|
|
struct tm *lt = localtime (&now);
|
|
if (! (lt
|
|
&& lt->tm_year == tm.tm_year
|
|
&& lt->tm_mon == tm.tm_mon
|
|
&& lt->tm_mday == tm.tm_mday
|
|
&& lt->tm_hour == tm.tm_hour
|
|
&& lt->tm_min == tm.tm_min
|
|
&& lt->tm_sec == tm.tm_sec
|
|
&& lt->tm_yday == tm.tm_yday
|
|
&& lt->tm_wday == tm.tm_wday
|
|
&& ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
|
|
== (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
year_2050_test ()
|
|
{
|
|
/* The correct answer for 2050-02-01 00:00:00 in Pacific time,
|
|
ignoring leap seconds. */
|
|
unsigned long int answer = 2527315200UL;
|
|
|
|
struct tm tm;
|
|
time_t t;
|
|
tm.tm_year = 2050 - 1900;
|
|
tm.tm_mon = 2 - 1;
|
|
tm.tm_mday = 1;
|
|
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
|
|
tm.tm_isdst = -1;
|
|
|
|
/* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
|
|
instead of "TZ=America/Vancouver" in order to detect the bug even
|
|
on systems that don't support the Olson extension, or don't have the
|
|
full zoneinfo tables installed. */
|
|
if (putenv ("TZ=PST8PDT,M4.1.0,M10.5.0") != 0)
|
|
return -1;
|
|
|
|
t = mktime (&tm);
|
|
|
|
/* Check that the result is either a failure, or close enough
|
|
to the correct answer that we can assume the discrepancy is
|
|
due to leap seconds. */
|
|
return (t == (time_t) -1
|
|
|| (0 < t && answer - 120 <= t && t <= answer + 120));
|
|
}
|
|
|
|
static int
|
|
indiana_test ()
|
|
{
|
|
if (putenv ("TZ=America/Indiana/Indianapolis") != 0)
|
|
return -1;
|
|
struct tm tm;
|
|
tm.tm_year = 1986 - 1900; tm.tm_mon = 4 - 1; tm.tm_mday = 28;
|
|
tm.tm_hour = 16; tm.tm_min = 24; tm.tm_sec = 50; tm.tm_isdst = 0;
|
|
time_t std = mktime (&tm);
|
|
if (! (std == 515107490 || std == 515107503))
|
|
return 1;
|
|
|
|
/* This platform supports TZDB, either without or with leap seconds.
|
|
Return true if GNU Bug#48085 is absent. */
|
|
tm.tm_isdst = 1;
|
|
time_t dst = mktime (&tm);
|
|
return std - dst == 60 * 60;
|
|
}
|
|
|
|
int
|
|
main ()
|
|
{
|
|
int result = 0;
|
|
time_t t, delta;
|
|
int i, j;
|
|
int time_t_signed_magnitude = (time_t) ~ (time_t) 0 < (time_t) -1;
|
|
|
|
#if HAVE_DECL_ALARM
|
|
/* This test makes some buggy mktime implementations loop.
|
|
Give up after 60 seconds; a mktime slower than that
|
|
isn't worth using anyway. */
|
|
signal (SIGALRM, SIG_DFL);
|
|
alarm (60);
|
|
#endif
|
|
|
|
time_t_max = (! TIME_T_IS_SIGNED
|
|
? (time_t) -1
|
|
: ((((time_t) 1 << (sizeof (time_t) * CHAR_BIT - 2)) - 1)
|
|
* 2 + 1));
|
|
time_t_min = (! TIME_T_IS_SIGNED
|
|
? (time_t) 0
|
|
: time_t_signed_magnitude
|
|
? ~ (time_t) 0
|
|
: ~ time_t_max);
|
|
|
|
delta = time_t_max / 997; /* a suitable prime number */
|
|
for (i = 0; i < N_STRINGS; i++)
|
|
{
|
|
if (tz_strings[i])
|
|
putenv (tz_strings[i]);
|
|
|
|
for (t = 0; t <= time_t_max - delta && (result & 1) == 0; t += delta)
|
|
if (! mktime_test (t))
|
|
result |= 1;
|
|
if ((result & 2) == 0
|
|
&& ! (mktime_test ((time_t) 1)
|
|
&& mktime_test ((time_t) (60 * 60))
|
|
&& mktime_test ((time_t) (60 * 60 * 24))))
|
|
result |= 2;
|
|
|
|
for (j = 1; (result & 4) == 0; j <<= 1)
|
|
{
|
|
if (! bigtime_test (j))
|
|
result |= 4;
|
|
if (INT_MAX / 2 < j)
|
|
break;
|
|
}
|
|
if ((result & 8) == 0 && ! bigtime_test (INT_MAX))
|
|
result |= 8;
|
|
}
|
|
if (! irix_6_4_bug ())
|
|
result |= 16;
|
|
if (! spring_forward_gap ())
|
|
result |= 32;
|
|
if (! year_2050_test () || ! indiana_test ())
|
|
result |= 64;
|
|
return result;
|
|
}]])],
|
|
[gl_cv_func_working_mktime=yes],
|
|
[gl_cv_func_working_mktime=no],
|
|
[case "$host_os" in
|
|
# Guess no on native Windows.
|
|
mingw*) gl_cv_func_working_mktime="guessing no" ;;
|
|
*) gl_cv_func_working_mktime="$gl_cross_guess_normal" ;;
|
|
esac
|
|
])
|
|
fi
|
|
])
|
|
])
|
|
|
|
dnl Main macro of module 'mktime'.
|
|
AC_DEFUN([gl_FUNC_MKTIME],
|
|
[
|
|
AC_REQUIRE([gl_TIME_H_DEFAULTS])
|
|
AC_REQUIRE([AC_CANONICAL_HOST])
|
|
AC_REQUIRE([gl_FUNC_MKTIME_WORKS])
|
|
|
|
REPLACE_MKTIME=0
|
|
if test "$gl_cv_func_working_mktime" != yes; then
|
|
REPLACE_MKTIME=1
|
|
AC_DEFINE([NEED_MKTIME_WORKING], [1],
|
|
[Define if the compilation of mktime.c should define 'mktime'
|
|
with the algorithmic workarounds.])
|
|
fi
|
|
case "$host_os" in
|
|
mingw*)
|
|
REPLACE_MKTIME=1
|
|
AC_DEFINE([NEED_MKTIME_WINDOWS], [1],
|
|
[Define if the compilation of mktime.c should define 'mktime'
|
|
with the native Windows TZ workaround.])
|
|
;;
|
|
esac
|
|
])
|
|
|
|
dnl Main macro of module 'mktime-internal'.
|
|
AC_DEFUN([gl_FUNC_MKTIME_INTERNAL], [
|
|
AC_REQUIRE([gl_FUNC_MKTIME_WORKS])
|
|
|
|
WANT_MKTIME_INTERNAL=0
|
|
dnl BeOS has __mktime_internal in libc, but other platforms don't.
|
|
AC_CHECK_FUNC([__mktime_internal],
|
|
[AC_DEFINE([mktime_internal], [__mktime_internal],
|
|
[Define to the real name of the mktime_internal function.])
|
|
],
|
|
[dnl mktime works but it doesn't export __mktime_internal,
|
|
dnl so we need to substitute our own mktime implementation.
|
|
WANT_MKTIME_INTERNAL=1
|
|
AC_DEFINE([NEED_MKTIME_INTERNAL], [1],
|
|
[Define if the compilation of mktime.c should define 'mktime_internal'.])
|
|
])
|
|
])
|
|
|
|
# Prerequisites of lib/mktime.c.
|
|
AC_DEFUN([gl_PREREQ_MKTIME], [:])
|