2018-08-09 04:05:39 -04:00
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#########################################################################
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# #
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# Star Traders: A Game of Interstellar Trading #
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# Copyright (C) 1990-2018, John Zaitseff #
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# #
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#########################################################################
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# Author: John Zaitseff <J.Zaitseff@zap.org.au>
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# $Id$
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#
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# This file contains the macro USE_LATEST_XOPEN_SOURCE to determine the
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# latest version of _XOPEN_SOURCE supported by the C library. It does
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# this by compiling code with various values of that symbol. Once a
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# particular value compiles without error, it redefines _XOPEN_SOURCE to
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# that value using the auxiliary file <lib/xopen_source.h> and sets
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# $x_cv_latest_xopen_source to one of the following values:
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#
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# 700 - _XOPEN_SOURCE=700 (for SUSv4 / XPG7) was accepted
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# 600 - _XOPEN_SOURCE=600 (for SUSv3 / XPG6) was accepted
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# unknown - _XOPEN_SOURCE set to above values failed to compile
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#
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see https://www.gnu.org/licenses/.
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AC_DEFUN([_CHECK_XOPEN_SOURCE], [dnl
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
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/* Test for $2 */
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@%:@define _XOPEN_SOURCE $1
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@%:@include <stdio.h>
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])], [$3], [$4])
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])dnl
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AC_DEFUN([USE_LATEST_XOPEN_SOURCE], [dnl
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AH_BOTTOM([
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/* Redefine _XOPEN_SOURCE as required */
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2018-08-09 04:11:28 -04:00
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@%:@include <xopen_source.h>
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2018-08-09 04:05:39 -04:00
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])
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AC_CACHE_CHECK([the latest supported version of _XOPEN_SOURCE],
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[x_cv_latest_xopen_source], [
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x_cv_latest_xopen_source=unknown
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_CHECK_XOPEN_SOURCE([700], [SUSv4 / XPG7], [
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x_cv_latest_xopen_source=700
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], [_CHECK_XOPEN_SOURCE([600], [SUSv3 / XPG6], [
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x_cv_latest_xopen_source=600
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])])
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])
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AS_IF([test "x$x_cv_latest_xopen_source" != xunknown], [dnl
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AC_DEFINE_UNQUOTED([LATEST_XOPEN_SOURCE],
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[$x_cv_latest_xopen_source],
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[Define to the latest version of _XOPEN_SOURCE that is supported.])
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])
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])dnl USE_LATEST_XOPEN_SOURCE
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