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* NEWS, doc/autoconf.texi (Particular Functions),

Browse Source 
lib/autoconf/functions.m4 (AC_FUNC_MKTIME): Check that mktime
is the inverse of localtime.
This commit is contained in:
Paul Eggert 2003-05-28 20:03:52 +00:00
parent a4d96919f1
commit 3a1b2ca878
4 changed files with 36 additions and 9 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
2003-05-28 Paul Eggert <eggert@twinsun.com>
* NEWS, doc/autoconf.texi (Particular Functions),
lib/autoconf/functions.m4 (AC_FUNC_MKTIME): Check that mktime
is the inverse of localtime.
2003-05-25 Alexandre Duret-Lutz <adl@gnu.org>
* lib/Autom4te/General.pm (END): Print diagnostics to STDERR.

3
NEWS
View File

@ -6,6 +6,9 @@
** AC_DECL_SYS_SIGLIST
Works again.
** AC_FUNC_MKTIME
Now checks that mktime is the inverse of localtime.
** Improve DJGPP portability
The Autoconf tools and configure behave better under DJGPP.

3
doc/autoconf.texi
View File

@ -3945,6 +3945,9 @@ type @code{mbstate_t} are properly declared.
@prindex @code{mktime}
If the @code{mktime} function is not available, or does not work
correctly, require an @code{AC_LIBOBJ} replacement for @samp{mktime}.
For the purposes of this test, @code{mktime} should conform to the
@acronym{POSIX} standard and should be the inverse of
@code{localtime}.
@end defmac
@defmac AC_FUNC_MMAP

33
lib/autoconf/functions.m4
View File

@ -940,7 +940,7 @@ test $ac_cv_func_memcmp_working = no && AC_LIBOBJ([memcmp])
AN_FUNCTION([mktime], [AC_FUNC_MKTIME])
AC_DEFUN([AC_FUNC_MKTIME],
[AC_REQUIRE([AC_HEADER_TIME])dnl
AC_CHECK_HEADERS(sys/time.h unistd.h)
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(
@ -956,6 +956,10 @@ AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
# endif
#endif
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
@ -968,10 +972,11 @@ AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
#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]))
@ -1002,15 +1007,21 @@ spring_forward_gap ()
}
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
@ -1070,6 +1081,9 @@ main ()
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++)
{
@ -1078,8 +1092,9 @@ main ()
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);