Markus Armbruster
9645caf6ff
Testing whether the compiler supports it is a bit tricky. The obvious AX_APPEND_COMPILE_FLAGS([-fstack-protector-strong]) doesn't suffice, since some ports of the GNU toolchain reportedly pass this test, then fail to link. That's because the compiler accepts the flag, duly emits references to helper code in libc, but libc doesn't provide, and linking fails. Instead, use AX_APPEND_LINK_FLAGS with an input source that makes the compiler emit the extra stack checking code. This requires the latest version from the autoconf-archive, so update m4/ax* to commit e3d948b. Also update m4/my_append_compile_flags.m4 to keep it in sync with upstream's ax_append_compile_flags.m4. Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
239 lines
7 KiB
Text
239 lines
7 KiB
Text
#
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# Empire - A multi-player, client/server Internet based war game.
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# Copyright (C) 1986-2015, 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, 2005-2015
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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(2.64)
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AC_INIT([Wolfpack Empire], [4.3.34], [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
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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_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 $srcdir/.git; then revctrl=git
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else revctrl=
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fi
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AC_SUBST(revctrl,$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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### 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 getpass)
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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([ 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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