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configure.ac
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configure.ac
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# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
# This file is part of Hercules.
# http://herc.ws - http://github.com/HerculesWS/Hercules
#
# Copyright (C) 2012-2015 Hercules Dev Team
# Copyright (C) Athena Dev Teams
#
# Hercules 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 <http://www.gnu.org/licenses/>.
AC_INIT(Hercules)
AC_REVISION([m4_esyscmd_s([type git >/dev/null 2>&1 && git describe --always 2>/dev/null || echo '(unknown version)'])])
AC_PREREQ([2.59])
AC_CONFIG_SRCDIR([src/common/cbasetypes.h])
AC_CONFIG_FILES([Makefile src/common/Makefile])
AC_CONFIG_FILES([3rdparty/mt19937ar/Makefile 3rdparty/libconfig/Makefile])
AC_CONFIG_FILES([src/char/Makefile src/login/Makefile])
AC_CONFIG_FILES([src/map/Makefile src/plugins/Makefile src/tool/Makefile])
AC_CONFIG_FILES([src/test/Makefile])
AC_CONFIG_FILES([tools/HPMHookGen/Makefile])
AC_CONFIG_FILES([tools/doxygen/Makefile])
dnl AC_USE_SYSTEM_EXTENSIONS requires autoconf 2.60 or newer. Fall back to AC_GNU_SOURCE otherwise.
m4_ifdef([AC_USE_SYSTEM_EXTENSIONS],
[AC_USE_SYSTEM_EXTENSIONS],
[AC_GNU_SOURCE]
)
# Root-check
host_is="`uname`"
case $host_os in
CYGWIN*)
;;
*)
if type id >/dev/null 2>&1 && test -z "$CI"; then
euid="`id -u`"
if test "$euid" == "0"; then
echo ""
echo "********************************************************************************"
echo '* W A R N I N G /!\ *'
echo "********************************************************************************"
echo "* It appears that you're planning to run Hercules with root privileges. That's *"
echo "* not necessary, nor recommended, and it may open your machine to unnecessary *"
echo "* security risks. You should never ever run software as root unless it *"
echo "* requires the extra privileges (which Hercules does not.) *"
echo "* *"
echo "* More info: *"
echo "* http://www.tldp.org/HOWTO/Security-HOWTO/local-security.html *"
echo "* https://wiki.debian.org/sudo *"
echo "* http://wiki.centos.org/TipsAndTricks/BecomingRoot *"
echo "* http://fedoraproject.org/wiki/Configuring_Sudo *"
echo "* https://help.ubuntu.com/community/RootSudo *"
echo "* http://www.freebsdwiki.net/index.php/Root *"
echo "* *"
echo "* If your service provider forces (or encourages) you to run server software *"
echo "* as root, please complain to them. It is a very bad idea. *"
echo "********************************************************************************"
echo "Execution will be paused for 60 seconds... Press Ctrl-C now if you wish to stop."
for j in 1 2 3 4 5 6; do
for i in 1 2 3 4 5 6 7 8 9 10; do
printf "\a. "
sleep 1
done
echo ""
done
echo ""
echo "Resuming as root. If anything breaks, you'll get to keep the pieces."
sleep 2
fi
fi
;;
esac
#
# Memory managers
#
AC_ARG_ENABLE(
[manager],
AC_HELP_STRING(
[--enable-manager=ARG],
[memory managers: no, builtin, memwatch, dmalloc, gcollect, bcheck (defaults to builtin)]
),
[
enable_manager="$enableval"
case $enableval in
"no");;
"builtin");;
"memwatch");;
"dmalloc");;
"gcollect");;
"bcheck");;
*) AC_MSG_ERROR([[unknown memory manager '$enableval'... stopping]]);;
esac
],
[enable_manager="builtin"]
)
#
# packetver
#
AC_ARG_ENABLE(
[packetver],
AC_HELP_STRING(
[--enable-packetver=ARG],
[Sets the PACKETVER define. (see src/common/mmo.h)]
),
[enable_packetver="$enableval"],
[enable_packetver=""]
)
#
# packetver-RE
#
AC_ARG_ENABLE(
[packetver-re],
AC_HELP_STRING(
[--enable-packetver-re],
[Sets or unsets the PACKETVER_RE define - see src/common/mmo.h (currently disabled by default)]
),
[
enable_packetver_re="$enableval"
case $enableval in
"no");;
"yes");;
*) AC_MSG_ERROR([[invalid argument --enable-packetver-re=$enableval... stopping]]);;
esac
],
[enable_packetver_re="no"]
)
#
# Epoll
#
AC_ARG_ENABLE([epoll],
[AS_HELP_STRING([--enable-epoll],[use epoll(4) on Linux])],
[enable_epoll=$enableval],
[enable_epoll=no]
)
if test x$enable_epoll = xno; then
have_linux_epoll=no
else
AC_MSG_CHECKING([for Linux epoll(4)])
AC_LINK_IFELSE([AC_LANG_PROGRAM(
[
#ifndef __linux__
#error This is not Linux
#endif
#include <sys/epoll.h>
],
[epoll_create1 (EPOLL_CLOEXEC);])],
[have_linux_epoll=yes],
[have_linux_epoll=no]
)
AC_MSG_RESULT([$have_linux_epoll])
fi
if test x$enable_epoll,$have_linux_epoll = xyes,no; then
AC_MSG_ERROR([epoll support explicitly enabled but not available])
fi
#
# Obfuscation keys
#
AC_ARG_WITH(
[key1],
AC_HELP_STRING(
[--with-key1@<:@=ARG@:>@],
[Set the first obfuscation key (ignored unless the other two are also specified)]
),
[
obfuscationkey1="$( expr "0x$withval" : '0*x*\(0x@<:@A-Fa-f0-9@:>@\{8\}\)' )"
if ! expr "x$obfuscationkey1" : 'x0x@<:@A-Fa-f0-9@:>@\{8\}' >/dev/null 2>&1; then
obfuscationkey1=""
fi
],
[
obfuscationkey1=""
]
)
AC_ARG_WITH(
[key2],
AC_HELP_STRING(
[--with-key2@<:@=ARG@:>@],
[Set the second obfuscation key (ignored unless the other two are also specified)]
),
[
obfuscationkey2="$( expr "0x$withval" : '0*x*\(0x@<:@A-Fa-f0-9@:>@\{8\}\)' )"
if ! expr "x$obfuscationkey2" : 'x0x@<:@A-Fa-f0-9@:>@\{8\}' >/dev/null 2>&1; then
obfuscationkey2=""
fi
],
[
obfuscationkey2=""
]
)
AC_ARG_WITH(
[key3],
AC_HELP_STRING(
[--with-key3@<:@=ARG@:>@],
[Set the third obfuscation key (ignored unless the other two are also specified)]
),
[
obfuscationkey3="$( expr "0x$withval" : '0*x*\(0x@<:@A-Fa-f0-9@:>@\{8\}\)' )"
if ! expr "x$obfuscationkey3" : 'x0x@<:@A-Fa-f0-9@:>@\{8\}' >/dev/null 2>&1; then
obfuscationkey3=""
fi
],
[
obfuscationkey3=""
]
)
#
# debug
#
AC_ARG_ENABLE(
[debug],
AC_HELP_STRING(
[--enable-debug@<:@=ARG@:>@],
[
Compiles extra debug code. (yes by default)
(available options: yes, no, gdb)
]
),
[
enable_debug="$enableval"
case $enableval in
"no");;
"yes");;
"gdb");;
*) AC_MSG_ERROR([[invalid argument --enable-debug=$enableval... stopping]]);;
esac
],
[enable_debug="yes"]
)
#
# Buildbot
#
AC_ARG_ENABLE(
[buildbot],
AC_HELP_STRING(
[--enable-buildbot@<:@=ARG@:>@],
[(available options: yes, no)]
),
[
enable_buildbot="$enableval"
case $enableval in
"no");;
"yes");;
*) AC_MSG_ERROR([[invalid argument --enable-buildbot=$enableval... stopping]]);;
esac
],
[enable_buildbot="no"]
)
#
# RDTSC as Tick Source
#
AC_ARG_ENABLE(
[rdtsc],
AC_HELP_STRING(
[--enable-rdtsc],
[
Uses rdtsc as timing source (disabled by default)
Enable it when you've timing issues.
(For example: in conjunction with XEN or Other Virtualization mechanisms)
Note:
Please ensure that you've disabled dynamic CPU-Frequencys, such as power saving options.
(On most modern Dedicated Servers cpufreq is preconfigured, see your distribution's
manual how to disable it).
Furthermore, If your CPU has built-in CPU-Frequency scaling features (such as Intel's
SpeedStep(R)), do not enable this option. Recent CPUs (Intel Core or newer) guarantee
a fixed increment rate for their TSC, so it should be safe to use, but please doublecheck
the documentation of both your CPU and OS before enabling this option.
]
),
[
enable_rdtsc=1
],
[enable_rdtsc=0]
)
#
# Profiler
#
AC_ARG_ENABLE(
[profiler],
AC_HELP_STRING(
[--enable-profiler=ARG],
[Profilers: no, gprof (disabled by default)]
),
[
enable_profiler="$enableval"
case $enableval in
"no");;
"gprof");;
*) AC_MSG_ERROR([[invalid argument --enable-profiler=$enableval... stopping]]);;
esac
],
[enable_profiler="no"]
)
#
# 64bit
#
AC_ARG_ENABLE(
[64bit],
AC_HELP_STRING(
[--disable-64bit],
[
Enforce 32bit output on x86_64 systems.
]
),
[
enable_64bit="$enableval"
case $enableval in
"no");;
"yes");;
*) AC_MSG_ERROR([[invalid argument --enable-64bit=$enableval... stopping]]);;
esac
],
[enable_64bit="yes"]
)
#
# LTO
#
AC_ARG_ENABLE(
[lto],
AC_HELP_STRING(
[--enable-lto],
[
Enables or Disables Linktime Code Optimization (LTO is disabled by default)
]
),
[
enable_lto="$enableval"
case $enableval in
"no");;
"yes");;
*) AC_MSG_ERROR([[invalid argument --enable-lto=$enableval... stopping]]);;
esac
],
[enable_lto="no"]
)
#
# static linking
#
AC_ARG_ENABLE(
[static],
AC_HELP_STRING(
[--enable-static],
[
Enables or Disables Statick Linking (STATIC is disabled by default)
]
),
[
enable_static="$enableval"
case $enableval in
"no");;
"yes");;
*) AC_MSG_ERROR([[invalid argument --enable-static=$enableval... stopping]]);;
esac
],
[enable_static="no"]
)
#
# adress sanitize
#
AC_ARG_ENABLE(
[sanitize],
AC_HELP_STRING(
[--enable-sanitize@<:@=ARG@:>@],
[
Enables sanitizer. (disabled by default)
(available options: yes, no, full)
]
),
[
enable_sanitize="$enableval"
case $enableval in
"no");;
"yes");;
"full");;
*) AC_MSG_ERROR([[invalid argument --enable-sanitize=$enableval... stopping]]);;
esac
],
[enable_sanitize="no"]
)
#
# -Werror compiler flag
# It's not always possible (if at all) to pass -Werror in the CFLAGS, since
# autoconf often generates test-code that produces warnings.
# Reference: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734104
#
AC_ARG_ENABLE(
[Werror],
AC_HELP_STRING(
[--enable-Werror],
[
Enables -Werror in the compiler flags. (disabled by default)
]
),
[
enable_Werror="$enableval"
case $enableval in
"no");;
"yes");;
*) AC_MSG_ERROR([[invalid argument --enable-Werror=$enableval... stopping]]);;
esac
],
[enable_Werror="no"]
)
#
# Renewal
#
AC_ARG_ENABLE(
[renewal],
AC_HELP_STRING(
[--disable-renewal],
[
Disable Ragnarok Renewal support (override settings in src/config/renewal.h)
]
),
[
enable_renewal="$enableval"
case $enableval in
"no");;
"yes");;
*) AC_MSG_ERROR([[invalid argument --enable-renewal=$enableval... stopping]]);;
esac
],
[enable_renewal="yes"]
)
#
# Optionally set the max number of network conenctions
# the core will be support
#
AC_ARG_WITH(
[maxconn],
AC_HELP_STRING(
[--with-maxconn@<:@=ARG@:>@],
[optionally set the maximum connections the core can handle (default: 16384) NOT USED YET - EXPERIMENTAL]
),
[
if test "$withval" == "no"; then
CPPFLAGS="$CPPFLAGS -DMAXCONN=16384"
else
if ! test "$withval" -ge 0 -o "$withval" -lt 0 2>&- ; then
AC_MSG_ERROR([Invalid argument --with-maxconn=$withval ... stopping])
else
CPPFLAGS="$CPPFLAGS -DMAXCONN=$withval"
fi
fi
],
[
CPPFLAGS="$CPPFLAGS -DMAXCONN=16384"
]
)
#
# Optionally specify the path to mysql_config
#
AC_ARG_WITH(
[mysql],
AC_HELP_STRING(
[--with-mysql@<:@=ARG@:>@],
[optionally specify the path to the mysql_config executable]
),
[
if test "$withval" != "no" ; then
if test ! -x "$withval" ; then
AC_MSG_ERROR([$withval is not an executable file])
fi
MYSQL_CONFIG_HOME="$withval"
fi
]
)
#
# Manual MYSQL_CFLAGS (optional)
#
AC_ARG_WITH(
[MYSQL_CFLAGS],
AC_HELP_STRING(
[--with-MYSQL_CFLAGS=ARG],
[specify MYSQL_CFLAGS manually (instead of using "mysql_config --include")]
),
[
manual_MYSQL_CFLAGS="yes"
MYSQL_CFLAGS="$withval"
],
[manual_MYSQL_CFLAGS="no"]
)
#
# Manual MYSQL_LIBS (optional)
#
AC_ARG_WITH(
[MYSQL_LIBS],
AC_HELP_STRING(
[--with-MYSQL_LIBS=ARG],
[specify MYSQL_LIBS manually (instead of using "mysql_config --libs")]
),
[
manual_MYSQL_LIBS="yes"
MYSQL_LIBS="$withval"
],
[manual_MYSQL_LIBS="no"]
)
###############################################################################
# Check for programs and types.
#
AC_PROG_MAKE_SET
AC_PROG_CC
AC_PROG_CPP
AC_PATH_PROG(AR, ar)
AC_LANG([C])
# -Wcast-qual use for check wrong casts. It cant be added by default, because some casts must be wrong.
# -Wconversion warning: conversion to 'long unsigned int' from 'int' may change the sign of the result
# -Wfloat-equal comparing floating point with == or != is unsafe
# -Wunsuffixed-float-constants float issues
# -Wpedantic different pedantic checks. Not all can be fixed in nice way.
# -Wtraditional-conversion some conversion issues
# -Wunsafe-loop-optimizations possible optimisation issues
# -Wunused-parameter -Wunused-but-set-parameter unused parameters
# -Wunused-macros unused macro warnings, but it also enable unused parameters
# -Wstrict-prototypes show warning in grammar.y
# -wdiscarded-qualifiers show different const removal
# attributes suggestion
# -Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=pure
# flags what can be used but now return no warnings:
# -Wchkp -Wdisabled-optimization
# -Werror-implicit-function-declaration -Wtrampolines
# -Wjump-misses-init
CFLAGS="$CFLAGS -pipe -ffast-math -Wall -Wextra -Wno-sign-compare -std=c99"
CPPFLAGS="$CPPFLAGS -I../common"
LDFLAGS="$LDFLAGS"
# Add /usr/local to the library and header search path, where appropriate
case `uname` in
Darwin*|*BSD*)
if test -d /usr/local/include ; then
CPPFLAGS="$CPPFLAGS -I/usr/local/include"
fi
if test -d /usr/local/lib ; then
LDFLAGS="$LDFLAGS -L/usr/local/lib"
fi
;;
esac
AC_C_BIGENDIAN(
[AC_MSG_ERROR([[bigendian is not supported... stopping]])],
,
[AC_MSG_WARN([[unable to determine endianess, only little endian is supported]])]
)
if test "$enable_64bit" = "no" ; then
AC_MSG_CHECKING([whether pointers can be stored in ints (old code)])
pointers_fit_in_ints="no"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[static int test_array[((long int)sizeof(int)) == ((long int)sizeof(void*)) ? 1 : -1];]])],
[pointers_fit_in_ints="yes"],
[]
)
if test "$pointers_fit_in_ints" = "no" ; then
CFLAGS="$CFLAGS -m32"
LDFLAGS="$LDFLAGS -m32"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[static int test_array[((long int)sizeof(int)) == ((long int)sizeof(void *)) ? 1 : -1];]])],
[pointers_fit_in_ints="yes (with -m32)"],
[]
)
fi
AC_MSG_RESULT($pointers_fit_in_ints)
if test "$pointers_fit_in_ints" = "no" ; then
AC_MSG_ERROR([pointers cannot be stored in ints, required for old code... stopping])
fi
fi
#
# check if we're producing 32bit code - so well produce binarys for at least i686 (speedup: cmovs, and cmpchg8 support)
#
AC_MSG_CHECKING([whether $CC produces 32bit code])
AC_RUN_IFELSE(
[AC_LANG_SOURCE([
int main(int argc, char **argv){
if(sizeof(void*) == 4) return 0;
else return 1;
}
])],
[
AC_MSG_RESULT([yes])
AC_MSG_CHECKING([whether $CC supports -march=i686 (and we can run it)])
OLD_CFLAGS="$CFLAGS"
OLD_LDFLAGS="$LDFLAGS"
CFLAGS="$CFLAGS -march=i686"
LDFLAGS="$LDFLAGS -march=i686"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([
int main(int argc, char **argv) { return 0; }
])],
[
AC_MSG_RESULT([yes])
],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
LDFLAGS="$OLD_LDFLAGS"
],
[
AC_MSG_RESULT([guessing no])
CFLAGS="$OLD_CFLAGS"
LDFLAGS="$OLD_LDFLAGS"
]
)
],
[
AC_MSG_RESULT([no])
],
[
AC_MSG_RESULT([guessing no])
]
)
#
# Check if CC supports __thread attribute (Thread Local Storage)
# (Usually our OSX friends 're lacking support of it in older llvm versions ..)
#
AC_MSG_CHECKING([whether $CC supports __thread specifier (TLS)])
AC_RUN_IFELSE(
[AC_LANG_SOURCE([
__thread int g_Test = -1;
int main(int argc, char **argv){
g_Test = 0;
return g_Test;
}
])],
[
AC_MSG_RESULT([yes])
CPPFLAGS="$CPPFLAGS -DHAS_TLS"
],
[
AC_MSG_RESULT([no])
]
)
#
# Check if the linker supports/accepts -rdynamic
# Generally only needed by the ELF linker, in order to produce backtraces.
# On non-ELF platforms, some compilers (i.e. gcc < 5 and clang on OSX) are able to ignore it, others will error out.
#
OLD_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -rdynamic"
AC_MSG_CHECKING([whether $CC accepts -rdynamic])
AC_LINK_IFELSE(
[AC_LANG_SOURCE([
int main(int argc, char **argv)
{
return 0;
}
])],
[
AC_MSG_RESULT([yes])
],
[
AC_MSG_RESULT([no])
LDFLAGS="$OLD_LDFLAGS"
],
[
AC_MSG_RESULT([guessing no])
]
)
#
# LTO Support test
#
if test "$enable_lto" != "no" ; then
OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -flto"
OLD_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -flto"
AC_MSG_CHECKING([whether $CC supports -flto])
AC_RUN_IFELSE(
[AC_LANG_SOURCE([
int main(int argc, char **argv){
return 0;
}
])],
[
AC_MSG_RESULT([yes])
],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
LDFLAGS="$OLD_LDFLAGS"
],
[
AC_MSG_RESULT([guessing no])
]
)
fi
AC_DEFUN([AC_CHECK_SANITIZER_FLAG],
[
AC_MSG_CHECKING([whether $CC supports -fsanitize=$1])
OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fsanitize=$1"
OLD_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -fsanitize=$1"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([int foo;])],
[
AC_MSG_RESULT([yes])
],
[
AC_MSG_RESULT([no])
AC_MSG_CHECKING([whether $CC requires -fsanitize-undefined-trap-on-error for -fsanitize=$1])
CFLAGS="$CFLAGS -fsanitize-undefined-trap-on-error"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([int foo;])],
[
AC_MSG_RESULT([yes])
],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
LDFLAGS="$OLD_LDFLAGS"
]
)
],
[
AC_MSG_RESULT([guessing no])
CFLAGS="$OLD_CFLAGS"
LDFLAGS="$OLD_LDFLAGS"
]
)
]
)
AC_DEFUN([AC_CHECK_FLAG],
[
AC_MSG_CHECKING([whether $CC supports $1])
OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $1"
OLD_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS $1"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([int foo;])],
[
AC_MSG_RESULT([yes])
],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
LDFLAGS="$OLD_LDFLAGS"
],
[
AC_MSG_RESULT([guessing no])
CFLAGS="$OLD_CFLAGS"
LDFLAGS="$OLD_LDFLAGS"
]
)
]
)
#
# sanitize Support test
#
if test "$enable_sanitize" != "no" ; then
AC_CHECK_SANITIZER_FLAG(address)
if test "$enable_sanitize" == "full" ; then
# skipped because server have multiple issues: -fsanitize=alignment
AC_CHECK_SANITIZER_FLAG(shift)
AC_CHECK_SANITIZER_FLAG(integer-divide-by-zero)
AC_CHECK_SANITIZER_FLAG(unreachable)
AC_CHECK_SANITIZER_FLAG(vla-bound)
AC_CHECK_SANITIZER_FLAG(null)
AC_CHECK_SANITIZER_FLAG(return)
AC_CHECK_SANITIZER_FLAG(signed-integer-overflow)
AC_CHECK_SANITIZER_FLAG(bounds)
AC_CHECK_SANITIZER_FLAG(bounds-strict)
AC_CHECK_SANITIZER_FLAG(object-size)
AC_CHECK_SANITIZER_FLAG(float-divide-by-zero)
AC_CHECK_SANITIZER_FLAG(float-cast-overflow)
AC_CHECK_SANITIZER_FLAG(nonnull-attribute)
AC_CHECK_SANITIZER_FLAG(returns-nonnull-attribute)
AC_CHECK_SANITIZER_FLAG(bool)
AC_CHECK_SANITIZER_FLAG(enum)
AC_CHECK_SANITIZER_FLAG(vptr)
fi
fi
AC_DEFUN([AC_CHECK_COMPILER_WFLAG],
[
AC_MSG_CHECKING([whether $CC supports -W$1])
OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror -W$1"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([int foo;])],
[
AC_MSG_RESULT([yes])
CFLAGS="$OLD_CFLAGS -W$1"
# Optionally, run a test
if test "x$2" != "x"; then
AC_MSG_CHECKING([whether $CC can actually use -W$1])
CFLAGS="$OLD_CFLAGS -Werror -W$1"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([$2])],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
]
[
AC_MSG_RESULT([yes])
CFLAGS="$OLD_CFLAGS -W$1"
],
)
fi
],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
]
)
]
)
AC_DEFUN([AC_CHECK_COMPILER_WNOFLAG],
[
AC_MSG_CHECKING([whether $CC supports -Wno-$1])
OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror -Wno-$1"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([int foo;])],
[
# Recent versions of gcc don't fail if -Wno-foo is not recognized
# (unless there are also other warnings), so we also check for -Wfoo
# which always fails if not supported
CFLAGS="$OLD_CFLAGS -Werror -W$1"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([int foo;])],
[
AC_MSG_RESULT([yes])
CFLAGS="$OLD_CFLAGS -Wno-$1"
# Optionally, run a test
if test "x$2" != "x"; then
AC_MSG_CHECKING([whether $CC can actually use -Wno-$1])
CFLAGS="$OLD_CFLAGS -Werror -W$1"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([$2])],
[
AC_MSG_RESULT([not needed but enabled])
CFLAGS="$OLD_CFLAGS"
],
[
CFLAGS="$OLD_CFLAGS -Werror -Wno-$1"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([$2])],
[
AC_MSG_RESULT([yes])
CFLAGS="$OLD_CFLAGS -Wno-$1"
],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
]
)
]
)
fi
],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
]
)
],
[
AC_MSG_RESULT([no])
CFLAGS="$OLD_CFLAGS"
]
)
]
)
AC_CHECK_COMPILER_WNOFLAG(unused-parameter, [int foo(int bar) { return 0; }])
AC_CHECK_COMPILER_WNOFLAG(clobbered)
AC_CHECK_COMPILER_WFLAG(empty-body)
AC_CHECK_COMPILER_WFLAG(newline-eof)
AC_CHECK_COMPILER_WFLAG(int-conversion)
AC_CHECK_COMPILER_WFLAG(init-self)
AC_CHECK_COMPILER_WFLAG(pointer-arith)
AC_CHECK_COMPILER_WFLAG(switch-bool)
AC_CHECK_COMPILER_WFLAG(enum-conversion)
AC_CHECK_COMPILER_WFLAG(shorten-64-to-32)
AC_CHECK_COMPILER_WFLAG(constant-conversion)
AC_CHECK_COMPILER_WFLAG(bool-conversion)
AC_CHECK_COMPILER_WFLAG(format-security)
AC_CHECK_COMPILER_WFLAG(format)
AC_CHECK_COMPILER_WFLAG(format-signedness)
AC_CHECK_COMPILER_WFLAG(format-y2k)
AC_CHECK_COMPILER_WFLAG(missing-include-dirs)
AC_CHECK_COMPILER_WFLAG(suggest-attribute=noreturn)
AC_CHECK_COMPILER_WFLAG(undef)
#AC_CHECK_COMPILER_WFLAG(cast-align)
#AC_CHECK_COMPILER_WFLAG(logical-op) # some useless warnings
AC_CHECK_COMPILER_WFLAG(nested-externs)
AC_CHECK_COMPILER_WFLAG(old-style-definition)
AC_CHECK_COMPILER_WFLAG(overlength-strings)
AC_CHECK_COMPILER_WFLAG(redundant-decls)
AC_CHECK_COMPILER_WFLAG(cast-qual)
AC_CHECK_COMPILER_WFLAG(misleading-indentation)
AC_CHECK_COMPILER_WFLAG(null-dereference)
AC_CHECK_COMPILER_WNOFLAG(format-nonliteral)
AC_CHECK_COMPILER_WNOFLAG(switch)
AC_CHECK_COMPILER_WNOFLAG(missing-field-initializers)
AC_CHECK_COMPILER_WNOFLAG(suggest-attribute=format)
# Certain versions of gcc make -Wshadow completely useless by making it flood
# you with unnecessary warnings <https://lkml.org/lkml/2006/11/28/239>
# Let's check if we can really use it
SAVED_OLD_CFLAGS="$CFLAGS"
AC_CHECK_COMPILER_WFLAG(shadow)
if test "x$CFLAGS" != "x$SAVED_OLD_CFLAGS"; then
AC_MSG_CHECKING([whether $CC can efficiently use -Wshadow])
NEW_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror -Wshadow"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([
int foo(void) {
return 0;
}
int bar(void) {
int foo = 0;
return foo + 1;
}
])],
[
AC_MSG_RESULT([yes])
CFLAGS="$NEW_CFLAGS"
],
[
AC_MSG_RESULT([no])
CFLAGS="$SAVED_OLD_CFLAGS"
]
)