-#serial 1000
+# mktime.m4 serial 5
+dnl Copyright (C) 2002, 2003 Free Software Foundation, 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 Just like mktime.m4 from automake-1.3b, but with an additional test.
-dnl Renamed to have jm_ prefix and to use jm_ prefix on cache variable names.
+dnl From Jim Meyering.
-AC_DEFUN(jm_AM_FUNC_MKTIME,
+# Redefine AC_FUNC_MKTIME, to fix a bug in Autoconf 2.57 and earlier.
+# This redefinition can be removed once a new version of Autoconf comes out.
+# The redefinition is taken from
+# <http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/autoconf/autoconf/lib/autoconf/functions.m4?rev=1.78>.
+# AC_FUNC_MKTIME
+# --------------
+AC_DEFUN([AC_FUNC_MKTIME],
[AC_REQUIRE([AC_HEADER_TIME])dnl
- AC_CHECK_HEADERS(sys/time.h unistd.h)
- AC_CHECK_FUNCS(alarm)
- AC_CACHE_CHECK([for working mktime], jm_am_cv_func_working_mktime,
- [AC_TRY_RUN(
-changequote(<<, >>)dnl
-<</* Test program from Paul Eggert (eggert@twinsun.com)
- and Tony Leneis (tony@plaza.ds.adp.com). */
+AC_CHECK_HEADERS(stdlib.h sys/time.h unistd.h)
+AC_CHECK_FUNCS(alarm)
+AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
+[AC_RUN_IFELSE([AC_LANG_SOURCE(
+[[/* Test program from Paul Eggert and Tony Leneis. */
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
# endif
#endif
+#if HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#undef putenv
static time_t time_t_max;
+static time_t time_t_min;
/* Values we'll use to set the TZ environment variable. */
-static const char *const tz_strings[] = {
- (const char *) 0, "TZ=GMT0", "TZ=JST-9",
+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]))
static void
spring_forward_gap ()
{
- /* glibc (up to about 1998-10-07) failed this test) */
+ /* glibc (up to about 1998-10-07) failed this test. */
struct tm tm;
- putenv ("TZ=America/Vancouver");
+
+ /* 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. */
+ putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
+
tm.tm_year = 98;
tm.tm_mon = 3;
tm.tm_mday = 5;
}
static void
-mktime_test (now)
+mktime_test1 (now)
time_t now;
{
struct tm *lt;
if ((lt = localtime (&now)) && mktime (lt) != now)
exit (1);
- now = time_t_max - now;
- if ((lt = localtime (&now)) && mktime (lt) != now)
- exit (1);
+}
+
+static void
+mktime_test (now)
+ time_t now;
+{
+ mktime_test1 (now);
+ mktime_test1 ((time_t) (time_t_max - now));
+ mktime_test1 ((time_t) (time_t_min + now));
}
static void
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;
- /* This test makes some buggy mktime implementations loop.
- Give up after 10 seconds. */
- alarm (10);
now = mktime (&tm);
- alarm (0);
if (now != (time_t) -1)
{
struct tm *lt = localtime (&now);
time_t t, delta;
int i, j;
+ /* This test makes some buggy mktime implementations loop.
+ Give up after 60 seconds; a mktime slower than that
+ isn't worth using anyway. */
+ alarm (60);
+
for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
continue;
time_t_max--;
+ if ((time_t) -1 < 0)
+ for (time_t_min = -1; (time_t) (time_t_min * 2) < 0; time_t_min *= 2)
+ continue;
delta = time_t_max / 997; /* a suitable prime number */
for (i = 0; i < N_STRINGS; i++)
{
for (t = 0; t <= time_t_max - delta; t += delta)
mktime_test (t);
- mktime_test ((time_t) 60 * 60);
- mktime_test ((time_t) 60 * 60 * 24);
+ mktime_test ((time_t) 1);
+ mktime_test ((time_t) (60 * 60));
+ mktime_test ((time_t) (60 * 60 * 24));
for (j = 1; 0 < j; j *= 2)
- bigtime_test (j);
+ bigtime_test (j);
bigtime_test (j - 1);
}
irix_6_4_bug ();
spring_forward_gap ();
exit (0);
-}
- >>,
-changequote([, ])dnl
- jm_am_cv_func_working_mktime=yes, jm_am_cv_func_working_mktime=no,
- dnl When crosscompiling, assume mktime is missing or broken.
- jm_am_cv_func_working_mktime=no)
- ])
- if test $jm_am_cv_func_working_mktime = no; then
- LIBOBJS="$LIBOBJS mktime.o"
+}]])],
+ [ac_cv_func_working_mktime=yes],
+ [ac_cv_func_working_mktime=no],
+ [ac_cv_func_working_mktime=no])])
+if test $ac_cv_func_working_mktime = no; then
+ AC_LIBOBJ([mktime])
+fi
+])# AC_FUNC_MKTIME
+
+AC_DEFUN([gl_FUNC_MKTIME],
+[
+ AC_REQUIRE([AC_FUNC_MKTIME])
+ if test $ac_cv_func_working_mktime = no; then
+ AC_DEFINE(mktime, rpl_mktime,
+ [Define to rpl_mktime if the replacement function should be used.])
+ gl_PREREQ_MKTIME
fi
])
+
+# Prerequisites of lib/mktime.c.
+AC_DEFUN([gl_PREREQ_MKTIME], [:])
projects / gnulib.git / blobdiff