Markus Armbruster
deee99a01d
We require POSIX.1-2001. Some systems provide it only with feature
test macro _POSIX_C_SOURCE defined to 200112L. Since we don't define
it, the build fails there. Observed on Solaris 10.
We actually require the XSI extension. The GNU C Library provides it
by default. With _POSIX_C_SOURCE 200112L, however, you have to define
feature test macro _XOPEN_SOURCE to get it. But then _POSIX_C_SOURCE
is redundant.
Make configure put #define _XOPEN_SOURCE 600 into config.h. Drop the
two existing #define _XOPEN_SOURCE 500 in .c files.
Now Solaris cc refuses to play ball unless switched to C99. Replace
AC_PROG_CC by AC_PROG_CC_STDC to mollify it.
Unfortunately, use of _XOPEN_SOURCE exposes bugs in AIX libc and old
versions of GNU libc:
* AIX defines struct in6_addr's member s6_addr as a macro expanding
into the actual member. Without _ALL_SOURCE (the default), the
expansion is wrong and doesn't compile. Observed with AIX V7.2.
* GNU lib's IN6_IS_ADDR_V4MAPPED() is unusable without
_DEFAULT_SOURCE (default) or _GNU_SOURCE. Observed with Debian 8.
Tracked at <https://sourceware.org/bugzilla/show_bug.cgi?id=16421>,
fixed in version 2.25.
Affects just sockaddr_ntop()'s special case from commit 372cdb136 "Use
IPv4 format for IPv4-mapped addresses", v4.3.31. Disable the special
case and use IPv6 format on such systems. This is a very minor
usability regression. Could be avoided, I guess, but it's not worth
the trouble.
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
252 lines
7.5 KiB
Text
252 lines
7.5 KiB
Text
#
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# Empire - A multi-player, client/server Internet based war game.
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# Copyright (C) 1986-2020, Dave Pare, Jeff Bailey, Thomas Ruschak,
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# Ken Stevens, Steve McClure, Markus Armbruster
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#
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# Empire is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your 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
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# GNU 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 <http://www.gnu.org/licenses/>.
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#
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# ---
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#
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# See files README, COPYING and CREDITS in the root of the source
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# tree for related information and legal notices. It is expected
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# that future projects/authors will amend these files as needed.
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#
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# ---
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#
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# configure.ac: Autoconf input file
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#
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# Known contributors to this file:
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# Markus Armbruster, 2005-2020
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#
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# Process this file with autoconf to produce a configure script.
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# Autoconf makes checking for and programming around assorted ancient
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# crap relatively painless. But why bother? Just rely on C89 and
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# POSIX, and when something breaks on some oddball machine, see
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# whether it's worth fixing.
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AC_PREREQ(2.69)
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AC_INIT([Wolfpack Empire],
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m4_esyscmd([build-aux/git-version-gen .tarball-version]),
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[wolfpack@wolfpackempire.com], [empire],
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[http://www.wolfpackempire.com/])
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AC_CONFIG_SRCDIR([include/combat.h])
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AC_CONFIG_AUX_DIR([build-aux])
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AC_CONFIG_MACRO_DIR([m4])
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AC_CONFIG_HEADERS([config.h])
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### Checks for programs
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AC_PROG_AWK
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AC_PROG_INSTALL
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AC_PROG_RANLIB
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AC_PROG_CC_STDC
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AM_PROG_CC_C_O
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# Private automake macro, tsk, tsk, tsk...
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_AM_DEPENDENCIES(CC)
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AC_DEFINE([_XOPEN_SOURCE], [600],
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[Request POSIX-1.2001 with XSI Extension])
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# Note: this is after AC_PROG_CC_STDC, because Solaris cc fails with
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# _XOPEN_SOURCE unless switched to C99, which breaks AC_PROG_CC_STDC.
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AC_ARG_VAR(NROFF, [nroff command])
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AC_CHECK_PROG(NROFF, groff, [GROFF_NO_SGR= groff -Tascii -U], nroff)
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# not really a check for a program, but close enough
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if test -d $srcdir/.git
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then revctrl=git
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else revctrl=
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fi
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if test "$revctrl" && test -r $srcdir/.tarball-version
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then AC_MSG_ERROR([$srcdir/.tarball-version must not exist])
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fi
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AC_SUBST(revctrl,$revctrl)
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# Not a program, but need to check this early
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MY_WINDOWS_API
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### Checks for libraries
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AX_PTHREAD
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LIBS_util="$LIBS"
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LIBS="$LIBS_SOCKETS $LIBS"
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AX_LIB_SOCKET_NSL
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LIBS_server="$LIBS"
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MY_WITH_READLINE
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### Checks for header files
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### Checks for typedefs, structures, and compiler characteristics
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# Enable useful warnings
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# Some of them are commented out because the code needs cleanup first
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# Clang needs to be tested with -Werror=unknown-warning-option
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AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],
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[cflags_test="-Werror=unknown-warning-option"],
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[cflags_test=""])
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MY_APPEND_COMPILE_FLAGS([-Wall -Wextra dnl
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dnl -Wcast-align dnl
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dnl -Wconversion dnl
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-Wdeclaration-after-statement dnl
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dnl -Wformat-nonliteral dnl
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-Wformat-security dnl
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-Winit-self dnl
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-Wlogical-op dnl
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-Wmissing-prototypes dnl
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-Wnested-externs dnl
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-Wold-style-definition dnl
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-Wpacked dnl
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-Wpointer-arith dnl
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-Wredundant-decls dnl
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dnl -Wshadow dnl
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-Wstrict-prototypes dnl
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dnl too prone to false positives: -Wsuggest-attribute=format dnl
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dnl -Wswitch-default dnl
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-Wundef dnl
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-Wno-unused-parameter dnl
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], [], [$cflags_test])
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# Our carg() conflicts with libm's TODO clean that up
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MY_APPEND_COMPILE_FLAGS([-fno-builtin-carg -Wno-incompatible-library-redeclaration])
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# No multiple definitions of uninitialized global variables
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MY_APPEND_COMPILE_FLAGS([-fno-common])
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# Reign in overzealous optimizers
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#
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# Contemporary compilers can squeeze out some extra performance by
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# assuming the program never executes code that has undefined behavior
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# according to the C standard. Unfortunately, this can break
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# programs. Pointing out that these programs are non-conforming is as
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# correct as it is unhelpful, at least as long as the compiler is
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# unable to diagnose the non-conformingness.
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#
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# Since keeping our programs working is a lot more important to us
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# than running them as fast as possible, forbid some assumptions that
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# are known to break real-world programs:
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#
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# * Aliasing: perfectly clean programs don't engage in type-punning,
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# and perfectly conforming programs do it only in full accordance
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# with the standard's (subtle!) aliasing rules. Neither kind of
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# perfection is realistic for us, therefore -fno-strict-aliasing.
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#
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# * Signed integer overflow: perfectly clean programs won't ever do
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# signed integer arithmetic that overflows. This is an imperfect
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# program, therefore -fno-strict-overflow.
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#
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MY_APPEND_COMPILE_FLAGS([dnl
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-fno-strict-aliasing dnl
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-fno-strict-overflow])
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# Emit extra code to check for buffer overflows
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# Could fall back to -fstack-protector when -fstack-protector-strong
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# isnt't supported, for users of older compilers. Doesn't seem worth
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# the trouble, though.
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# Some ports of the GNU toolchain reportedly support it in the
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# compiler, but not libc. Use a test program that makes the compiler
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# emit the extra stack checking code, and test it compiles and links.
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AX_APPEND_LINK_FLAGS([-fstack-protector-strong], [], [],
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[AC_LANG_SOURCE([[
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int
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main(int argc, char *argv[])
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{
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char arr[64], *dst = arr, *src = argv[0];
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while ((*dst++ = *src++)) ;
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}
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]])])
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### Checks for library functions
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AC_CHECK_FUNCS(getaddrinfo)
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MY_WORKING_IN6_IS_ADDR_V4MAPPED
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MY_FUNC_MAKECONTEXT
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### Site configuration
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# Can't be bothered to make MAXNOC configurable right now.
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AC_DEFINE([MAXNOC], [99],
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[The maximum number of countries])
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AC_ARG_VAR([EMPIREHOST], [Default host (client only) [127.0.0.1]])
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test "$EMPIREHOST" || EMPIREHOST=127.0.0.1
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AC_ARG_VAR([EMPIREPORT], [Default port (client and server) [6665]])
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test "$EMPIREPORT" || EMPIREPORT=6665
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AC_ARG_WITH([pthread],
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AS_HELP_STRING([--with-pthread],
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[use POSIX threads]))
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# Select thread package
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empthread=
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if test "$with_pthread" != no; then
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if test "$ax_pthread_ok" = yes; then
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empthread=POSIX
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fi
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fi
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if test -z "$with_pthread" || test "$with_pthread" = no; then
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if test "$ac_cv_func_makecontext" = yes; then
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empthread=LWP
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fi
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if test $Windows_API = yes; then
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empthread=Windows
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fi
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fi
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if test -z "$empthread"; then
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AC_MSG_ERROR([No usable thread package found])
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fi
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AC_SUBST(empthread)
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case $empthread in
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LWP) AC_DEFINE([EMPTH_LWP], 1, [Define to use LWP threads]) ;;
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POSIX) AC_DEFINE([EMPTH_POSIX], 1, [Define to use POSIX threads]) ;;
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Windows) AC_DEFINE([EMPTH_W32], 1, [Define to use Windows threads]) ;;
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esac
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MY_WITH_TERMINFO
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LIBS_client="$LIBS"
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### Output
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LIBS="$LIBS_util"
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AC_SUBST(LIBS_client)
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AC_SUBST(LIBS_server)
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AC_CONFIG_FILES([GNUmakefile])
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AC_CONFIG_COMMANDS([stamp-h],
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[case $revctrl in
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git)
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mkdir -p `cd $srcdir && git ls-files \
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| sed -n 's,/@<:@^/@:>@*$,,gp' | uniq`
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;;
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*)
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mkdir -p `sed s/.*=// <$srcdir/sources.mk | tr ' ' '\012' \
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| sed -n '/\//s,/@<:@^/@:>@*$,,gp'| uniq`
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esac
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mkdir -p info.html info.nr lib
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touch stamp-h],
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[revctrl=$revctrl])
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AC_OUTPUT
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AC_MSG_NOTICE([])
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AC_MSG_NOTICE([-= Configuration summary =-])
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AC_MSG_NOTICE([Thread package: $empthread])
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AC_MSG_NOTICE([ readline: $with_readline])
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AC_MSG_NOTICE([ terminfo: $with_terminfo])
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AC_MSG_NOTICE([ EMPIREHOST: $EMPIREHOST])
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AC_MSG_NOTICE([ EMPIREPORT: $EMPIREPORT])
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