mirror of https://git.zap.org.au/git/trader.git
65 lines
2.6 KiB
Plaintext
65 lines
2.6 KiB
Plaintext
#########################################################################
|
|
# #
|
|
# Star Traders: A Game of Interstellar Trading #
|
|
# Copyright (C) 1990-2024, John Zaitseff #
|
|
# #
|
|
#########################################################################
|
|
|
|
# Author: John Zaitseff <J.Zaitseff@zap.org.au>
|
|
# $Id$
|
|
#
|
|
# This file contains the macro USE_LATEST_XOPEN_SOURCE to determine the
|
|
# latest version of _XOPEN_SOURCE supported by the C library. It does
|
|
# this by compiling code with various values of that symbol. Once a
|
|
# particular value compiles without error, it redefines _XOPEN_SOURCE to
|
|
# that value using the auxiliary file ../lib/xopen-source.h and sets
|
|
# $x_cv_latest_xopen_source to one of the following values:
|
|
#
|
|
# 700 - _XOPEN_SOURCE=700 (for SUSv4 / XPG7) was accepted
|
|
# 600 - _XOPEN_SOURCE=600 (for SUSv3 / XPG6) was accepted
|
|
# unknown - _XOPEN_SOURCE set to above values failed to compile
|
|
#
|
|
#
|
|
# 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 3 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 https://www.gnu.org/licenses/.
|
|
|
|
AC_DEFUN([_CHECK_XOPEN_SOURCE], [dnl
|
|
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
|
|
/* Test for $2 */
|
|
@%:@define _XOPEN_SOURCE $1
|
|
@%:@include <stdio.h>
|
|
])], [$3], [$4])
|
|
])dnl
|
|
|
|
AC_DEFUN([USE_LATEST_XOPEN_SOURCE], [dnl
|
|
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
|
|
AH_BOTTOM([
|
|
/* Redefine _XOPEN_SOURCE as required */
|
|
@%:@include <xopen-source.h>
|
|
])
|
|
AC_CACHE_CHECK([the latest supported version of _XOPEN_SOURCE],
|
|
[x_cv_latest_xopen_source], [
|
|
x_cv_latest_xopen_source=unknown
|
|
_CHECK_XOPEN_SOURCE([700], [SUSv4 / XPG7], [
|
|
x_cv_latest_xopen_source=700
|
|
], [_CHECK_XOPEN_SOURCE([600], [SUSv3 / XPG6], [
|
|
x_cv_latest_xopen_source=600
|
|
])])
|
|
])
|
|
AS_IF([test "x$x_cv_latest_xopen_source" != xunknown], [dnl
|
|
AC_DEFINE_UNQUOTED([LATEST_XOPEN_SOURCE],
|
|
[$x_cv_latest_xopen_source],
|
|
[Define to the latest version of _XOPEN_SOURCE that is supported.])
|
|
])
|
|
])dnl USE_LATEST_XOPEN_SOURCE
|