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trader/m4/xopen-source.m4

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Move redefinition of _XOPEN_SOURCE into its own Autoconf macro and header This makes the main source code look a little cleaner, at the expense of background magic happening in the configure-generated config.h. But this magic was already happening for _GNU_SOURCE, __EXTENSIONS__ and the like. The only wrinkle is that newer versions of NcursesW cause ./configure to include "-D_XOPEN_SOURCE=600" as part of the compilation command line--on systems that support _XOPEN_SOURCE=700. The AC_DEFINE/AC_DEFINE_UNQUOTED macros automatically comment out any "#undef" lines in config.h, so the file lib/xopen_source.h works around this limitation. It is automatically included by config.h.
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#########################################################################
# #
# Star Traders: A Game of Interstellar Trading #
Update copyright year to 2019
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# Copyright (C) 1990-2019, John Zaitseff #
Move redefinition of _XOPEN_SOURCE into its own Autoconf macro and header This makes the main source code look a little cleaner, at the expense of background magic happening in the configure-generated config.h. But this magic was already happening for _GNU_SOURCE, __EXTENSIONS__ and the like. The only wrinkle is that newer versions of NcursesW cause ./configure to include "-D_XOPEN_SOURCE=600" as part of the compilation command line--on systems that support _XOPEN_SOURCE=700. The AC_DEFINE/AC_DEFINE_UNQUOTED macros automatically comment out any "#undef" lines in config.h, so the file lib/xopen_source.h works around this limitation. It is automatically included by config.h.
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# #
#########################################################################
# 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
Correct locations of files to include ".." where needed
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# that value using the auxiliary file ../lib/xopen-source.h and sets
Move redefinition of _XOPEN_SOURCE into its own Autoconf macro and header This makes the main source code look a little cleaner, at the expense of background magic happening in the configure-generated config.h. But this magic was already happening for _GNU_SOURCE, __EXTENSIONS__ and the like. The only wrinkle is that newer versions of NcursesW cause ./configure to include "-D_XOPEN_SOURCE=600" as part of the compilation command line--on systems that support _XOPEN_SOURCE=700. The AC_DEFINE/AC_DEFINE_UNQUOTED macros automatically comment out any "#undef" lines in config.h, so the file lib/xopen_source.h works around this limitation. It is automatically included by config.h.
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# $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], [$4])
])dnl
AC_DEFUN([USE_LATEST_XOPEN_SOURCE], [dnl
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AH_BOTTOM([
/* Redefine _XOPEN_SOURCE as required */
Use a hyphen instead of underscore for xopen-source.m4 and xopen-source.h
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@%:@include <xopen-source.h>
Move redefinition of _XOPEN_SOURCE into its own Autoconf macro and header This makes the main source code look a little cleaner, at the expense of background magic happening in the configure-generated config.h. But this magic was already happening for _GNU_SOURCE, __EXTENSIONS__ and the like. The only wrinkle is that newer versions of NcursesW cause ./configure to include "-D_XOPEN_SOURCE=600" as part of the compilation command line--on systems that support _XOPEN_SOURCE=700. The AC_DEFINE/AC_DEFINE_UNQUOTED macros automatically comment out any "#undef" lines in config.h, so the file lib/xopen_source.h works around this limitation. It is automatically included by config.h.
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])
AC_CACHE_CHECK([the latest supported version of _XOPEN_SOURCE],
[x_cv_latest_xopen_source], [
x_cv_latest_xopen_source=unknown
_CHECK_XOPEN_SOURCE([700], [SUSv4 / XPG7], [
x_cv_latest_xopen_source=700
], [_CHECK_XOPEN_SOURCE([600], [SUSv3 / XPG6], [
x_cv_latest_xopen_source=600
])])
])
AS_IF([test "x$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
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