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# serial 13
# Copyright (C) 2003, 2007, 2009-2020 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# See if we have a working tzset function.
# If so, arrange to compile the wrapper function.
# For at least Solaris 2.5.1 and 2.6, this is necessary
# because tzset can clobber the contents of the buffer
# used by localtime.
# Written by Paul Eggert and Jim Meyering.
AC_DEFUN([gl_FUNC_TZSET],
[
AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
AC_REQUIRE([gl_LOCALTIME_BUFFER_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CHECK_FUNCS_ONCE([tzset])
if test $ac_cv_func_tzset = no; then
HAVE_TZSET=0
fi
gl_FUNC_TZSET_CLOBBER
REPLACE_TZSET=0
case "$gl_cv_func_tzset_clobber" in
*yes)
REPLACE_TZSET=1
AC_DEFINE([TZSET_CLOBBERS_LOCALTIME], [1],
[Define if tzset clobbers localtime's static buffer.])
gl_LOCALTIME_BUFFER_NEEDED
;;
esac
case "$host_os" in
mingw*) REPLACE_TZSET=1 ;;
esac
])
# Set gl_cv_func_tzset_clobber.
AC_DEFUN([gl_FUNC_TZSET_CLOBBER],
[
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether tzset clobbers localtime buffer],
[gl_cv_func_tzset_clobber],
[AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <time.h>
#include <stdlib.h>
int
main ()
{
time_t t1 = 853958121;
struct tm *p, s;
putenv ("TZ=GMT0");
p = localtime (&t1);
s = *p;
putenv ("TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00");
tzset ();
return (p->tm_year != s.tm_year
|| p->tm_mon != s.tm_mon
|| p->tm_mday != s.tm_mday
|| p->tm_hour != s.tm_hour
|| p->tm_min != s.tm_min
|| p->tm_sec != s.tm_sec);
}
]])],
[gl_cv_func_tzset_clobber=no],
[gl_cv_func_tzset_clobber=yes],
[case "$host_os" in
# Guess all is fine on glibc systems.
*-gnu* | gnu*) gl_cv_func_tzset_clobber="guessing no" ;;
# Guess all is fine on musl systems.
*-musl*) gl_cv_func_tzset_clobber="guessing no" ;;
# Guess no on native Windows.
mingw*) gl_cv_func_tzset_clobber="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_tzset_clobber="$gl_cross_guess_inverted" ;;
esac
])
])
AC_DEFINE([HAVE_RUN_TZSET_TEST], [1],
[Define to 1 if you have run the test for working tzset.])
])
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