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# ===========================================================================
# http://www.nongnu.org/autoconf-archive/ax_var_timezone_externals.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_VAR_TIMEZONE_EXTERNALS
#
# DESCRIPTION
#
# Use instead of `AC_STRUCT_TIMEZONE' to determine whether the external
# timezone variables `timezone', `altzone' and `daylight' exist, defining
# `HAVE_TIMEZONE', `HAVE_ALTZONE' and `HAVE_DAYLIGHT' respectively (as
# well as gaining the macros defined by `AC_STRUCT_TIMEZONE').
#
# LICENSE
#
# Copyright (c) 2008 Mark R. Bannister
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
AU_ALIAS([AC_VAR_TIMEZONE_EXTERNALS], [AX_VAR_TIMEZONE_EXTERNALS])
AC_DEFUN([AX_VAR_TIMEZONE_EXTERNALS],
[ AC_REQUIRE([AC_STRUCT_TIMEZONE])dnl
AC_CACHE_CHECK(for timezone external, mb_cv_var_timezone,
[ AC_TRY_LINK([#include <time.h>], [return (int)timezone;],
mb_cv_var_timezone=yes,
mb_cv_var_timezone=no)
])
AC_CACHE_CHECK(for altzone external, mb_cv_var_altzone,
[ AC_TRY_LINK([#include <time.h>], [return (int)altzone;],
mb_cv_var_altzone=yes,
mb_cv_var_altzone=no)
])
AC_CACHE_CHECK(for daylight external, mb_cv_var_daylight,
[ AC_TRY_LINK([#include <time.h>], [return (int)daylight;],
mb_cv_var_daylight=yes,
mb_cv_var_daylight=no)
])
if test $mb_cv_var_timezone = yes; then
AC_DEFINE([HAVE_TIMEZONE], 1,
[Define if you have the external `timezone' variable.])
fi
if test $mb_cv_var_altzone = yes; then
AC_DEFINE([HAVE_ALTZONE], 1,
[Define if you have the external `altzone' variable.])
fi
if test $mb_cv_var_daylight = yes; then
AC_DEFINE([HAVE_DAYLIGHT], 1,
[Define if you have the external `daylight' variable.])
fi
])
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