2 # Empire - A multi-player, client/server Internet based war game.
3 # Copyright (C) 1986-2016, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 # Ken Stevens, Steve McClure, Markus Armbruster
6 # Empire is free software: you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation, either version 3 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
21 # See files README, COPYING and CREDITS in the root of the source
22 # tree for related information and legal notices. It is expected
23 # that future projects/authors will amend these files as needed.
27 # configure.ac: Autoconf input file
29 # Known contributors to this file:
30 # Markus Armbruster, 2005-2016
32 # Process this file with autoconf to produce a configure script.
34 # Autoconf makes checking for and programming around assorted ancient
35 # crap relatively painless. But why bother? Just rely on C89 and
36 # POSIX, and when something breaks on some oddball machine, see
37 # whether it's worth fixing.
40 AC_INIT([Wolfpack Empire],
41 m4_esyscmd([build-aux/git-version-gen .tarball-version]),
42 [wolfpack@wolfpackempire.com], [empire],
43 [http://www.wolfpackempire.com/])
44 AC_CONFIG_SRCDIR([include/combat.h])
45 AC_CONFIG_AUX_DIR([build-aux])
46 AC_CONFIG_MACRO_DIR([m4])
47 AC_CONFIG_HEADERS([config.h])
50 ### Checks for programs
56 # Private automake macro, tsk, tsk, tsk...
59 AC_ARG_VAR(NROFF, [nroff command])
60 AC_CHECK_PROG(NROFF, groff, [GROFF_NO_SGR= groff -Tascii -U], nroff)
62 # not really a check for a program, but close enough
63 if test -d $srcdir/.git
67 if test "$revctrl" && test -r .tarball-version
68 then AC_MSG_ERROR([.tarball-version must not exist])
70 AC_SUBST(revctrl,$revctrl)
72 # Not a program, but need to check this early
76 ### Checks for libraries
79 LIBS="$LIBS_SOCKETS $LIBS"
84 ### Checks for header files
87 ### Checks for typedefs, structures, and compiler characteristics
89 # Enable useful warnings
90 # Some of them are commented out because the code needs cleanup first
91 # Clang needs to be tested with -Werror=unknown-warning-option
92 AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],
93 [cflags_test="-Werror=unknown-warning-option"],
95 MY_APPEND_COMPILE_FLAGS([-Wall -Wextra dnl
98 -Wdeclaration-after-statement dnl
99 dnl -Wformat-nonliteral dnl
100 -Wformat-security dnl
103 -Wmissing-prototypes dnl
105 -Wold-style-definition dnl
108 -Wredundant-decls dnl
110 -Wstrict-prototypes dnl
111 dnl too prone to false positives: -Wsuggest-attribute=format dnl
112 dnl -Wswitch-default dnl
114 -Wno-unused-parameter dnl
115 ], [], [$cflags_test])
117 # Our carg() conflicts with libm's TODO clean that up
118 MY_APPEND_COMPILE_FLAGS([-fno-builtin-carg -Wno-incompatible-library-redeclaration])
120 # No multiple definitions of uninitialized global variables
121 MY_APPEND_COMPILE_FLAGS([-fno-common])
123 # Reign in overzealous optimizers
125 # Contemporary compilers can squeeze out some extra performance by
126 # assuming the program never executes code that has undefined behavior
127 # according to the C standard. Unfortunately, this can break
128 # programs. Pointing out that these programs are non-conforming is as
129 # correct as it is unhelpful, at least as long as the compiler is
130 # unable to diagnose the non-conformingness.
132 # Since keeping our programs working is a lot more important to us
133 # than running them as fast as possible, forbid some assumptions that
134 # are known to break real-world programs:
136 # * Aliasing: perfectly clean programs don't engage in type-punning,
137 # and perfectly conforming programs do it only in full accordance
138 # with the standard's (subtle!) aliasing rules. Neither kind of
139 # perfection is realistic for us, therefore -fno-strict-aliasing.
141 # * Signed integer overflow: perfectly clean programs won't ever do
142 # signed integer arithmetic that overflows. This is an imperfect
143 # program, therefore -fno-strict-overflow.
145 MY_APPEND_COMPILE_FLAGS([dnl
146 -fno-strict-aliasing dnl
147 -fno-strict-overflow])
149 # Emit extra code to check for buffer overflows
150 # Could fall back to -fstack-protector when -fstack-protector-strong
151 # isnt't supported, for users of older compilers. Doesn't seem worth
152 # the trouble, though.
153 # Some ports of the GNU toolchain reportedly support it in the
154 # compiler, but not libc. Use a test program that makes the compiler
155 # emit the extra stack checking code, and test it compiles and links.
156 AX_APPEND_LINK_FLAGS([-fstack-protector-strong], [], [],
159 main(int argc, char *argv[])
161 char arr[64], *dst = arr, *src = argv[0];
162 while ((*dst++ = *src++)) ;
167 ### Checks for library functions
169 AC_CHECK_FUNCS(getaddrinfo getpass)
173 ### Site configuration
175 # Can't be bothered to make MAXNOC configurable right now.
176 AC_DEFINE([MAXNOC], [99],
177 [The maximum number of countries])
179 AC_ARG_VAR([EMPIREHOST], [Default host (client only) [127.0.0.1]])
180 test "$EMPIREHOST" || EMPIREHOST=127.0.0.1
182 AC_ARG_VAR([EMPIREPORT], [Default port (client and server) [6665]])
183 test "$EMPIREPORT" || EMPIREPORT=6665
185 AC_ARG_WITH([pthread],
186 AS_HELP_STRING([--with-pthread],
187 [use POSIX threads]))
189 # Select thread package
191 if test "$with_pthread" != no; then
192 if test "$ax_pthread_ok" = yes; then
196 if test -z "$with_pthread" || test "$with_pthread" = no; then
197 if test "$ac_cv_func_makecontext" = yes; then
200 if test $Windows_API = yes; then
204 if test -z "$empthread"; then
205 AC_MSG_ERROR([No usable thread package found])
209 LWP) AC_DEFINE([EMPTH_LWP], 1, [Define to use LWP threads]) ;;
210 POSIX) AC_DEFINE([EMPTH_POSIX], 1, [Define to use POSIX threads]) ;;
211 Windows) AC_DEFINE([EMPTH_W32], 1, [Define to use Windows threads]) ;;
221 AC_SUBST(LIBS_client)
222 AC_SUBST(LIBS_server)
224 AC_CONFIG_FILES([GNUmakefile])
225 AC_CONFIG_COMMANDS([stamp-h],
228 mkdir -p `cd $srcdir && git ls-files \
229 | sed -n 's,/@<:@^/@:>@*$,,gp' | uniq`
232 mkdir -p `sed s/.*=// <$srcdir/sources.mk | tr ' ' '\012' \
233 | sed -n '/\//s,/@<:@^/@:>@*$,,gp'| uniq`
235 mkdir -p info.html info.nr lib
241 AC_MSG_NOTICE([-= Configuration summary =-])
242 AC_MSG_NOTICE([Thread package: $empthread])
243 AC_MSG_NOTICE([ terminfo: $with_terminfo])
244 AC_MSG_NOTICE([ EMPIREHOST: $EMPIREHOST])
245 AC_MSG_NOTICE([ EMPIREPORT: $EMPIREPORT])