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configure.ac
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configure.ac
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#
# Keepalived OpenSource project.
#
# Configuration template file for keepalived.
# autoconf will generate & check deps for proper compilation
#
# Copyright (C) 2001-2018 Alexandre Cassen, <[email protected]>
AC_DEFUN([add_to_var], [$1="$$1 $2"])
AC_DEFUN([add_to_var_ind], [eval $1=\"\$$1 $2\"]) dnl "
AC_DEFUN([add_to_var_ind_unique],
ADD_NEW=
[ eval var=\$$1
for item in $2; do
echo " $var " | $GREP -q " $item "
if test $? -ne 0; then
add_to_var([ADD_NEW], [$item])
fi
done
add_to_var_ind([$1], [$ADD_NEW])
])
AC_DEFUN([add_pkg_config],
[ if test -n "$2"; then
KA_PKG_PFX=$2
else
KA_PKG_PFX=KA
fi
add_to_var_ind_unique([${KA_PKG_PFX}_CPPFLAGS], [`$PKG_CONFIG --cflags-only-I $1`])
add_to_var_ind_unique([${KA_PKG_PFX}_CFLAGS], [`$PKG_CONFIG --cflags-only-other $1`])
if test .$3 = .remove-requires; then
REQUIRES=`$PKG_CONFIG --print-requires $1`
var=`$PKG_CONFIG --libs-only-l $1`
for r in $REQUIRES; do
REQ_LIBS=`$PKG_CONFIG --libs-only-l $r`
for l in $REQ_LIBS; do
var=`echo " $var " | sed -e "s: $l : :g"`
done
done
var=`echo $var | sed -e "s:^ *::" -e "s: *$::"`
eval ${KA_PKG_PFX}_LIBS="\"$var\""
var=`echo $var | sed -e "s/-l//g"`
eval ${KA_PKG_PFX}_LIB_NAMES="\"$var\""
else
add_to_var_ind_unique([${KA_PKG_PFX}_LIBS], [`$PKG_CONFIG --libs $1`])
fi
])
AC_DEFUN([add_pkg_config_without_libs],
[ if test -n "$2"; then
KA_PKG_PFX=$2
else
KA_PKG_PFX=KA
fi
add_to_var_ind_unique([${KA_PKG_PFX}_CPPFLAGS], [`$PKG_CONFIG --cflags-only-I $1`])
add_to_var_ind_unique([${KA_PKG_PFX}_CFLAGS], [`$PKG_CONFIG --cflags-only-other $1`])
])
AC_DEFUN([add_config_opt], [add_to_var([CONFIG_OPTIONS], [$1])])
AC_DEFUN([add_system_opt], [add_to_var([SYSTEM_OPTIONS], [$1])])
AC_DEFUN([get_lib_name],
[
if test $LDD = :; then
AC_MSG_ERROR([ldd is required for dynamic run-time linking support])
fi
SAV_LIBS="$LIBS"
LIBS="$LIBS -l$1"
AC_LINK_IFELSE([AC_LANG_SOURCE([[
extern void $2(void);
int main(void)
{
$2();
return 0;
}
]])], [
LIB_DETAILS=`$LDD ./conftest$EXEEXT | grep $1.so | sed -e "s/^[[ \t]]*//"`
LIB_NAME=`echo $LIB_DETAILS | sed -e "s/ .*//"`
],[
])
LIBS="$SAV_LIBS"
])
# AS_VAR_COPY was introduced in autoconf 2.63b.
# Remove the following definition once require autoconf >= 2.64.
m4_ifndef([AS_VAR_COPY],
[m4_define([AS_VAR_COPY],
[AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])])
dnl ----[ Process this file with autoconf to produce a configure script ]----
AC_PREREQ([2.63])
AC_INIT([Keepalived], [2.2.8], [[email protected]], [], [http://www.keepalived.org/])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([m4])
AM_INIT_AUTOMAKE([-Wall -Werror -Woverride foreign])
AC_CONFIG_SRCDIR([keepalived/core/main.c])
AC_CONFIG_HEADERS([lib/config.h lib/config_warnings.h])
AH_TOP(
[
#ifndef _CONFIG_H
#define _CONFIG_H
])
AH_BOTTOM(
[
#include "config_warnings.h"
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#endif])
AC_CONFIG_FILES([Makefile keepalived/Makefile lib/Makefile keepalived/core/Makefile keepalived.spec \
Dockerfile \
keepalived/check/Makefile keepalived/vrrp/Makefile \
keepalived/bfd/Makefile doc/Makefile bin_install/Makefile keepalived/dbus/Makefile \
keepalived/etc/Makefile keepalived/etc/init/Makefile keepalived/etc/init.d/Makefile \
keepalived/etc/sysconfig/Makefile keepalived/etc/keepalived/Makefile \
keepalived/trackers/Makefile \
doc/man/man8/Makefile doc/man/man5/Makefile doc/man/man1/Makefile])
MAINTAINERCLEANFILES="*~ *.orig *.rej core core.*"
AC_SUBST(MAINTAINERCLEANFILES)
CONFIG_OPTIONS=
SYSTEM_OPTIONS=
AM_SILENT_RULES([yes])
PKG_PROG_PKG_CONFIG
dnl ----[ Keepalived specific configure options ]----
AC_ARG_ENABLE(lvs-syncd,
[AS_HELP_STRING([--disable-lvs-syncd], [do not use LVS synchronization daemon])])
AC_ARG_ENABLE(lvs,
[AS_HELP_STRING([--disable-lvs], [do not use the LVS framework])])
AC_ARG_ENABLE(lvs-64bit-stats,
[AS_HELP_STRING([--disable-lvs-64bit-stats], [do not use the LVS 64-bit stats])])
AC_ARG_ENABLE(vrrp,
[AS_HELP_STRING([--disable-vrrp], [do not use the VRRP framework])])
AC_ARG_ENABLE(bfd,
[AS_HELP_STRING([--enable-bfd], [use the BFD framework])])
AC_ARG_WITH(kernel-dir,
[AS_HELP_STRING([--with-kernel-dir=DIR], [path to linux kernel source directory])],
[AS_HELP_STRING([kernel_src_path="$withval"],], [[kernel_src_path=""])])
AC_ARG_WITH(samples-dir,
[AS_HELP_STRING([--with-samples-dir=DIR], [specify location to install sample config files [SYSCONFDIR/samples]])])
AC_ARG_ENABLE(fwmark,
[AS_HELP_STRING([--disable-fwmark], [compile without SO_MARK support])])
AC_ARG_ENABLE(snmp,
[AS_HELP_STRING([--enable-snmp], [compile with SNMP support])])
AC_ARG_ENABLE(snmp-vrrp,
[AS_HELP_STRING([--enable-snmp-vrrp], [compile with SNMP vrrp support])])
AC_ARG_ENABLE(snmp-keepalived,
[AS_HELP_STRING([--enable-snmp-keepalived], [obsolete - use --enable-snmp-vrrp])])
AC_ARG_ENABLE(snmp-checker,
[AS_HELP_STRING([--enable-snmp-checker], [compile with SNMP checker support])])
AC_ARG_ENABLE(snmp-rfc,
[AS_HELP_STRING([--enable-snmp-rfc], [compile with SNMP RFC2787 (VRRPv2) and SNMP RFC6527 (VRRPv3) support])])
AC_ARG_ENABLE(snmp-rfcv2,
[AS_HELP_STRING([--enable-snmp-rfcv2], [compile with SNMP RFC2787 (VRRPv2) support])])
AC_ARG_ENABLE(snmp-rfcv3,
[AS_HELP_STRING([--enable-snmp-rfcv3], [compile with SNMP RFC6527 (VRRPv3) support])])
AC_ARG_ENABLE(snmp-reply-v3-for-v2,
[AS_HELP_STRING([--disable-snmp-reply-v3-for-v2], [disable RFC6527 responses for VRRPv2 instances])])
AC_ARG_ENABLE(dbus,
[AS_HELP_STRING([--enable-dbus], [compile with dbus support])])
AC_ARG_ENABLE(dbus-create-instance,
[AS_HELP_STRING([--enable-dbus-create-instance], [compile with dbus support for creating instances])])
AC_ARG_ENABLE(regex,
[AS_HELP_STRING([--enable-regex], [build with HTTP_GET regex checking])])
AC_ARG_ENABLE(vmac,
[AS_HELP_STRING([--disable-vmac], [build without VMAC support])])
AC_ARG_ENABLE(nm,
[AS_HELP_STRING([--enable-nm], [enable setting VMACs unmanaged by NetworkManager (for pre 1.18 NM)])])
AC_ARG_ENABLE(regex-timers,
[AS_HELP_STRING([--enable-regex-timers], [build with HTTP_GET regex timers])])
AC_ARG_ENABLE(json,
[AS_HELP_STRING([--enable-json], [compile with signal to dump configuration and stats as json])])
AC_ARG_ENABLE(clang,
[AS_HELP_STRING([--enable-clang], [use clang compiler])])
AC_ARG_ENABLE(lto,
[AS_HELP_STRING([--enable-lto], [use Link Time Optimisation])])
AC_ARG_ENABLE(reproducible-build,
[AS_HELP_STRING([--enable-reproducible-build], [make builds reproducible])])
AC_ARG_WITH(init,
[AS_HELP_STRING([--with-init=(upstart|systemd|SYSV|SUSE|openrc)], [specify init type])],
[init_type="$withval"], [init_type=""])
AC_ARG_ENABLE(vrrp-auth,
[AS_HELP_STRING([--disable-vrrp-auth], [compile without VRRP authentication])])
AC_ARG_ENABLE(checksum_compat,
[AS_HELP_STRING([--disable-checksum-compat], [compile without v1.3.6 and earlier VRRPv3 unicast checksum compatibility])])
AC_ARG_ENABLE(routes,
[AS_HELP_STRING([--disable-routes], [compile without ip rules/routes])])
AC_ARG_ENABLE(linkbeat,
[AS_HELP_STRING([--disable-linkbeat], [build without linkbeat support])])
AC_ARG_ENABLE(sockaddr_storage,
[AS_HELP_STRING([--enable-sockaddr-storage], [build using sockaddr_storage rather than smaller sockaddr for IPv4/6 only])])
AC_ARG_ENABLE(gnu-std-paths,
[AS_HELP_STRING([--enable-gnu-std-paths], [use GNU standard paths for pid files etc])])
AC_ARG_ENABLE(dynamic-linking,
[AS_HELP_STRING([--enable-dynamic-linking], [compile with/without dynamically linked libiptc/libipset/libnl])])
AC_ARG_ENABLE(iptables,
[AS_HELP_STRING([--disable-iptables], [compile without iptables support])],
[], [IPTABLES_SILENT=Yes])
AC_ARG_ENABLE(libiptc-dynamic,
[AS_HELP_STRING([--enable-libiptc-dynamic], [compile with libiptc dynamically linked])])
AC_ARG_ENABLE(libipset-dynamic,
[AS_HELP_STRING([--disable-libipset-dynamic], [compile with libipset statically linked])])
AC_ARG_ENABLE(libnl-dynamic,
[AS_HELP_STRING([--enable-libnl-dynamic], [compile with libnl dynamically linked])])
AC_ARG_ENABLE(libipset,
[AS_HELP_STRING([--disable-libipset], [compile without libipset])])
AC_ARG_ENABLE(nftables,
[AS_HELP_STRING([--disable-nftables], [build without nftables support])],
[], [NFTABLES_SILENT=Yes])
AC_ARG_ENABLE(libnl,
[AS_HELP_STRING([--disable-libnl], [compile without libnl])])
AC_ARG_ENABLE(track-process,
[AS_HELP_STRING([--disable-track-process], [build without track-process functionality])])
AC_ARG_ENABLE(systemd,
[AS_HELP_STRING([--disable-systemd], [build without systemd integration])])
AC_ARG_WITH(run-dir,
[AS_HELP_STRING([--with-run-dir=PATH_TO_RUN], [DEPRECATED - use --runstatedir=PATH_TO_RUN])])
AC_ARG_WITH(tmp-dir,
[AS_HELP_STRING([--with-tmp-dir=PATH_TO_TMP], [specify directory where run-time temporary files are to be located])],
[TMP_DIR_SPECIFIED=Y], [TMP_DIR_SPECIFIED=N])
AC_ARG_ENABLE(strict-config-checks,
[AS_HELP_STRING([--enable-strict-config-checks], [build with strict configuration checking])])
AC_ARG_ENABLE(hardening,
[AS_HELP_STRING([--disable-hardening], [do not build with security hardening])])
AC_ARG_ENABLE(optimise,
[AS_HELP_STRING([--enable-optimise], [compiler optimisation level])], [], [enable_optimise=not-specified])
AC_ARG_ENABLE(warnings,
[AS_HELP_STRING([--enable-warnings[[=WARNINGS]]], [additional compiler warnings, disable for reduced set])], [], [enable_warnings=yes])
AC_ARG_ENABLE(extra-warnings,
[AS_HELP_STRING([--enable-extra-warnings], [extra compiler warnings that will probably produce many warnings])])
AC_ARG_ENABLE(mem-check,
[AS_HELP_STRING([--enable-mem-check], [compile with memory alloc checking - e.g. no writes before or after buffer, everything allocated is freed])])
AC_ARG_ENABLE(mem-check-log,
[AS_HELP_STRING([--enable-mem-check-log], [compile with memory alloc checking writing to syslog])])
AC_ARG_ENABLE(openssl-mem-check,
[AS_HELP_STRING([--enable-openssl-mem-check], [compile with OpenSSL memory alloc checking - e.g. no writes before or after buffer, everything allocated is freed])])
AC_ARG_ENABLE(malloc-check,
[AS_HELP_STRING([--enable-malloc-check], [compile with malloc checking - i.e. malloc etc returning NULL])])
AC_ARG_ENABLE(timer-check,
[AS_HELP_STRING([--enable-timer-check], [compile with set time logging])])
AC_ARG_ENABLE(debug,
[AS_HELP_STRING([--enable-debug], [compile with most debugging options])])
AC_ARG_ENABLE(netlink-timers,
[AS_HELP_STRING([--enable-netlink-timers], [compile with netlink command timers])])
AC_ARG_ENABLE(smtp-alert-debug,
[AS_HELP_STRING([--enable-smtp-alert-debug], [compile with smtp-alert debugging])])
AC_ARG_ENABLE(stacktrace,
[AS_HELP_STRING([--enable-stacktrace], [compile with stacktrace support])])
AC_ARG_ENABLE(perf,
[AS_HELP_STRING([--enable-perf], [compile with perf performance data recording support for vrrp process])])
AC_ARG_ENABLE(log-file,
[AS_HELP_STRING([--enable-log-file], [enable logging to file (-g)])])
AC_ARG_ENABLE(dump-threads,
[AS_HELP_STRING([--enable-dump-threads], [compile with thread dumping support])])
AC_ARG_ENABLE(epoll-debug,
[AS_HELP_STRING([--enable-epoll-debug], [compile with epoll_wait() debugging support])])
AC_ARG_ENABLE(epoll-thread-dump,
[AS_HELP_STRING([--enable-epoll-thread-dump], [compile with epoll thread dumping support])])
AC_ARG_ENABLE(regex-debug,
[AS_HELP_STRING([--enable-regex-debug], [compile with regex debugging support])])
AC_ARG_ENABLE(tsm-debug,
[AS_HELP_STRING([--enable-tsm-debug], [compile with TSM debugging support])])
AC_ARG_ENABLE(vrrp-fd-debug,
[AS_HELP_STRING([--enable-vrrp-fd-debug], [compile with vrrp fd debugging support])])
AC_ARG_ENABLE(recvmsg-debug,
[AS_HELP_STRING([--enable-recvmsg-debug], [compile with recvmsg() debugging support])])
AC_ARG_ENABLE(eintr-debug,
[AS_HELP_STRING([--enable-eintr-debug], [compile with EINTR debugging support, set to check/not check for EINTR])])
AC_ARG_ENABLE(track-process-debug,
[AS_HELP_STRING([--enable-track-process-debug], [compile with track process debugging support, set to log all process connector events])])
AC_ARG_ENABLE(parser-debug,
[AS_HELP_STRING([--enable-parser-debug], [compile with parser debugging support])])
AC_ARG_ENABLE(checksum-debug,
[AS_HELP_STRING([--enable-checksum-debug], [compile with checksum debugging support])])
AC_ARG_ENABLE(checker-debug,
[AS_HELP_STRING([--enable-checker-debug], [compile with checker debugging support])])
AC_ARG_ENABLE(smtp-connect-debug,
[AS_HELP_STRING([--enable-smtp-connect-debug], [compile with smtp connect debugging support])])
AC_ARG_ENABLE(mem-err-debug,
[AS_HELP_STRING([--enable-mem-err-debug], [compile with MALLOC/FREE error debugging support])])
AC_ARG_ENABLE(script-debug,
[AS_HELP_STRING([--enable-script-debug], [compile with script termination debugging support])])
AC_ARG_ENABLE(one-process-debug,
[AS_HELP_STRING([--enable-one-process-debug], [compile with all functionality running in a single process])])
AC_ARG_ENABLE(dump-keywords,
[AS_HELP_STRING([--enable-dump-keywords], [compile with keyword dumping support])])
AC_ARG_ENABLE(network-timestamp,
[AS_HELP_STRING([--enable-network-timestamp], [compile with network timestamp debugging support])])
AC_ARG_ENABLE(asserts,
[AS_HELP_STRING([--enable-asserts], [compile with assert() enabled])])
AC_ARG_WITH(fixed-if-type,
[AS_HELP_STRING([--with-fixed-if-type=TYPE], [treat interface type TYPE as unchangeable])])
AC_ARG_WITH(default-config-file,
AS_HELP_STRING([--with-default-config-file=FILE], [Default configuration file]),
[default_config_file="$withval"], [default_config_file=""])
AC_ARG_WITH(default-runtime-options,
AS_HELP_STRING([--with-default-runtime-options=OPTIONS], [Default runtime options]),
[default_runtime_options="$withval"], [default_runtime_options="-D"])
AC_ARG_ENABLE(profile,
[AS_HELP_STRING([--enable-profile], [compile with profiling flags])])
AC_ARG_ENABLE(strict-cast-align,
[AS_HELP_STRING([--enable-strict-cast-align], [compile with strict cast alignment warnings])])
AC_ARG_ENABLE(cast-align-checks,
[AS_HELP_STRING([--enable-cast-align-checks], [runtime cast alignment checks])])
AC_ARG_ENABLE(cast-via-void,
[AS_HELP_STRING([--enable-cast-via-void], [enable pointer cast via void * (default if warns without)])]
[AS_HELP_STRING([--disable-cast-via-void], [disable pointer cast via void * (default if does not warn without)])])
AC_ARG_ENABLE(conversion-checks,
[AS_HELP_STRING([--enable-conversion-checks], [compile with conversion warnings if sensible])])
AC_ARG_ENABLE(force-conversion-checks,
[AS_HELP_STRING([--enable-force-conversion-checks], [compile with conversion warnings])])
AC_ARG_ENABLE(Werror,
[AS_HELP_STRING([--enable-Werror], [compile with warnings being errors])])
AC_ARG_WITH([systemdsystemunitdir],
[AS_HELP_STRING([--with-systemdsystemunitdir=DIR], [Directory for systemd service files])],,
[with_systemdsystemunitdir=auto])
AC_ARG_WITH([dbus-data-dir],
[AS_HELP_STRING([--with-dbus-data-dir=DIR], [Directory for Dbus interface files])])
# Set the kernel headers path
if test -n "$kernel_src_path"; then
if test ! -d $kernel_src_path/include; then
AC_MSG_ERROR([kernel source path $kernel_src_path/include does not exist])
fi
if test ! -d $kernel_src_path/include/linux; then
AC_MSG_ERROR([kernel source path $kernel_src_path/include does not appear to include linux header files])
fi
if test -d $kernel_src_path/include/uapi/linux; then
AC_MSG_ERROR([kernel source path $kernel_src_path appears to be an unprocessed kernel source tree])
fi
kernelinc="-isystem $kernel_src_path/include"
elif test ! -d /usr/include/linux -a \
-d /usr/src/linux/include; then
kernelinc="-isystem /usr/src/linux/include"
else
kernelinc=
fi
SRC_DIR=`AS_DIRNAME([$0])`
AS_IF([test -n "$with_samples_dir"],
[
AS_IF([test $with_samples_dir = yes -o $with_samples_dir = no],
[AC_MSG_ERROR([--with-samples-dir requires a directory])])
SAMPLES_DIR=$with_samples_dir
],[SAMPLES_DIR="\${sysconfdir}/$PACKAGE/samples"])
AC_SUBST([SAMPLES_DIR])
CPPFLAGS="$kernelinc $CPPFLAGS"
AS_IF([test .$enable_clang = .yes ],
[
USE_CC=clang
AC_CHECK_TOOL([USE_LLD], [lld], [:])
AS_IF([test $USE_LLD != :], [LDFLAGS+=" -fuse-ld=lld -rtlib=compiler-rt"])
],
[
USE_CC="gcc cc"
])
# Checks for programs.
AC_PROG_CC($USE_CC)
AC_PROG_MAKE_SET
AC_PROG_INSTALL
AC_PROG_RANLIB
AC_PROG_GREP
AC_PROG_LN_S
AC_PROG_SED
AC_CHECK_TOOL(STRIP,strip)
AC_CHECK_TOOL(LDD,ldd)
m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
ARFLAGS=cr
AC_SUBST(ARFLAGS)
# Default settings
ENABLE_LOG_FILE_APPEND=No
# AC_PROG_LIBTOOL
#
# save the configure arguments
#
args=`echo $ac_configure_args | $SED -e "s/'//g"`
AC_DEFINE_UNQUOTED(KEEPALIVED_CONFIGURE_OPTIONS,"$args", [configure options specified])
AS_IF([test .$enable_lto = .yes],
[
AS_IF([test .$enable_clang = .yes], [CFLAGS+=" -flto"], [CFLAGS+=" -flto=auto -ffat-lto-objects"])
])
# Save the CPPFLAGS, CFLAGS, LDFLAGS and LDLIBS settings for make time
KA_CPPFLAGS="$kernelinc -D_GNU_SOURCE $CPPFLAGS"
KA_CFLAGS="-g $CFLAGS"
KA_LDFLAGS=$LDFLAGS
KA_LIBS=$LDLIBS
# For reporting GCC bugs, uncomment the next two lines
#KA_CPPFLAGS="$KA_CPPFLAGS -v -save-temps"
#KA_CFLAGS="$KA_CFLAGS -v -save-temps"
# To produce mixed source and assembly
#KA_CFLAGS="$KA_CFLAGS -Wa,adhln"
NEED_LIBDL=No
#KA_LIBTOOLFLAGS =
# Set up the compiler warnings we want
dnl -- Unused warnings - traditional c90-c99-compat c99-c11-compat c++-compat larger-than=4096 long-long packed stringop-overflow switch-default vla vla-larger-than=ANY-SIZE
dnl alloca-size-larger-than= (since alloca warning)
MAX_FRAME_SIZE=5120
WARNINGS_BASIC="all extra unused strict-prototypes"
WARNINGS_STD="abi absolute-value address-of-packed-member alloca alloc-larger-than=4096 alloc-zero arith-conversion array-bounds=2 attribute-alias=2 bad-function-cast c11-c2x-compat cast-align cast-qual chkp date-time disabled-optimization double-promotion duplicated-branches duplicated-cond float-conversion float-equal format-overflow format-security format-signedness format-truncation frame-larger-than=$MAX_FRAME_SIZE implicit-fallthrough=3 init-self inline invalid-pch jump-misses-init logical-op missing-declarations missing-field-initializers missing-include-dirs missing-prototypes nested-externs normalized null-dereference old-style-definition overlength-strings pointer-arith redundant-decls shadow shift-overflow=2 stack-protector strict-overflow=4 stringop-overflow=2 stringop-truncation suggest-attribute=cold suggest-attribute=const suggest-attribute=format suggest-attribute=malloc suggest-attribute=noreturn suggest-attribute=pure sync-nand trampolines undef uninitialized unknown-pragmas unsafe-loop-optimizations unsuffixed-float-constants unused-const-variable=2 unused-macros variadic-macros write-strings"
WARNINGS_EXTRA="aggregate-return cast-align=strict conversion format-nonliteral format-overflow=2 format-truncation=2 padded pedantic sign-conversion stack-usage=$MAX_FRAME_SIZE strict-overflow=5 stringop-overflow=3 stringop-overflow=4 switch-enum system-headers traditional-conversion"
# We want _GNU_SOURCE defined always
add_to_var([CPPFLAGS], [-D_GNU_SOURCE])
# fpclassify() needs -lm
add_to_var([KA_LIBS], [-lm])
# Some sanity checks on configure options
AS_IF([test .$enable_vrrp = .no],
AS_IF([test .$IPTABLES_SILENT == .Yes], [enable_iptables=no])
AS_IF([test .$enable_perf != .], [AC_MSG_ERROR([enable-perf requires vrrp])])
AS_IF([test $with_fixed_if_type], [AC_MSG_ERROR([with-fixed-if-type requires vrrp])])
AS_IF([test .$enable_vrrp_fd_debug != .], [AC_MSG_ERROR([enable-vrrp-fd-debug requires vrrp])])
AS_IF([test .$enable_tsm_debug != .], [AC_MSG_ERROR([enable-tsm-debug requires vrrp])])
AS_IF([test .$enable_recvmsg_debug != .], [AC_MSG_ERROR([enable-recvmsg-debug requires vrrp])])
AS_IF([test .$enable_json != .], [AC_MSG_ERROR([enable-json requires vrrp])])
AS_IF([test .$enable_snmp_vrrp != .], [AC_MSG_ERROR([enable-snmp-vrrp requires vrrp])])
AS_IF([test .$enable_snmp_keepalived != .], [AC_MSG_ERROR([enable-snmp-keepalived requires vrrp])])
AS_IF([test .$enable_snmp_rfc != .], [AC_MSG_ERROR([enable-snmp-rfc requires vrrp])])
AS_IF([test .$enable_snmp_rfcv2 != .], [AC_MSG_ERROR([enable-snmp-rfcv2 requires vrrp])])
AS_IF([test .$enable_snmp_rfcv3 != .], [AC_MSG_ERROR([enable-snmp-rfcv3 requires vrrp])])
AS_IF([test .$enable_dbus != .], [AC_MSG_ERROR([enable-dbus requires vrrp])])
AS_IF([test .$enable_vrrp_auth != .], [AC_MSG_ERROR([disable-vrrp-auth requires vrrp])])
AS_IF([test .$enable_checksum_compat != .], [AC_MSG_ERROR([disable-checksum-compat requires vrrp])])
AS_IF([test .$enable_routes != .], [AC_MSG_ERROR([disable-routes requires vrrp])])
AS_IF([test .$enable_linkbeat != .], [AC_MSG_ERROR([disable-linkbeat requires vrrp])])
AS_IF([test .$enable_bfd != .], [AC_MSG_ERROR([enable-bfd requires vrrp])])
AS_IF([test .$enable_iptables != .no], [AC_MSG_ERROR([disable-iptables requires vrrp])])
AS_IF([test .$enable_track_process != .], [AC_MSG_ERROR([disable-track-process requires vrrp])])
AS_IF([test .$enable_network_timestamp != .], [AC_MSG_ERROR([enable-network-timestamp requires vrrp])])
AS_IF([test .$enable_netlink_timers != .], [AC_MSG_ERROR([enable-netlink-timers requires vrrp])])
)
AS_IF([test .$enable_iptables = .no],
AS_IF([test .$enable_libipset != .], [AC_MSG_ERROR([disable-libipset requires vrrp and iptables])])
)
AS_IF([test .$enable_libipset = .no],
AS_IF([test .$enable_libipset_dynamic != .], [AC_MSG_ERROR([disable-libipset-dynamic requires ipsets])])
)
AS_IF([test .$enable_snmp_rfc != .yes -a .$enable_snmp_rfcv3 != yes],
AS_IF([test .$enable_snmp_reply_v3_for_v2 != .], [AC_MSG_ERROR([disable-snmp-reply-v3-for-v2 requires enable-snmp-rfcv3 or enable-snmp-rfc])])
)
AS_IF([test .$enable_dbus != .yes],
AS_IF([test .$enable_dbus_create_instance != .], [AC_MSG_ERROR([enable-dbus-create-instance requires enable-dbus])])
)
AS_IF([test .$enable_lvs = .no],
AS_IF([test .$enable_regex != .], [AC_MSG_ERROR([enable-regex requires lvs])])
AS_IF([test .$enable_libnl != .], [AC_MSG_ERROR([disable-libnl requires lvs])])
AS_IF([test .$enable_lvs_syncd != .], [AC_MSG_ERROR([disable-lvs-syncd requires lvs])])
AS_IF([test .$enable_lvs_64bit_stats != .], [AC_MSG_ERROR([disable-lvs-64bit-stats requires lvs])])
AS_IF([test .$enable_fwmark != .], [AC_MSG_ERROR([disable-fwmark requires lvs])])
AS_IF([test .$enable_checker_debug != .], [AC_MSG_ERROR([enable-checker-debug requires lvs])])
AS_IF([test .$enable_openssl_mem_check != .], [AC_MSG_ERROR([enable-openssl-mem-check requires lvs])])
)
AS_IF([test .$enable_libnl = .no],
AS_IF([test .$enable_libnl_dynamic != .], [AC_MSG_ERROR([enable-libnl-dynamic requires lvs and libnl])])
)
AS_IF([test .$enable_regex != .yes],
AS_IF([test .$enable_regex_timers != .], [AC_MSG_ERROR([enable-regex-timers requires enable-regex])])
AS_IF([test .$enable_regex_debug != .], [AC_MSG_ERROR([enable-regex-debug requires enable-regex])])
)
AS_IF([test .$enable_track_process = .no],
AS_IF([test .$enable_track_process_debug != .], [AC_MSG_ERROR([enable-track-process-debug incompatible with disable-track-process])])
)
AS_IF([test .$enable_mem_check != .yes],
AS_IF([test .$enable_mem_err_debug != .], [AC_MSG_ERROR([enable-mem-err-debug requires --enable-mem-check])])
)
# --enable-debug enables most debugging if not explicitly disabled, but NOT one-process-debug
AS_IF([test .$enable_debug = .yes],
[
# If we are debugging, we want to be able to write logs to files
AS_IF([test .$enable_log_file = .], [enable_log_file=yes])
AS_IF([test .$enable_asserts = .], [enable_asserts=yes])
AS_IF([test .$enable_epoll_debug = .], [enable_epoll_debug=yes])
AS_IF([test .$enable_epoll_thread_dump = .], [enable_epoll_thread_dump=yes])
AS_IF([test .$enable_eintr_debug = .], [enable_eintr_debug=yes])
AS_IF([test .$enable_parser_debug = .], [enable_parser_debug=yes])
AS_IF([test .$enable_timer_check = .], [enable_timer_check=yes])
AS_IF([test .$enable_smtp_alert_debug = .], [enable_smtp_alert_debug=yes])
AS_IF([test .$enable_smtp_connect_debug = .], [enable_smtp_connect_debug=yes])
AS_IF([test .$enable_dump_keywords = .], [enable_dump_keywords=yes])
AS_IF([test .$enable_script_debug = .], [enable_script_debug=yes])
AS_IF([test .$enable_vrrp != .no],
[
AS_IF([test .$enable_vrrp_fd_debug = .], [enable_vrrp_fd_debug=yes])
AS_IF([test .$enable_tsm_debug = .], [enable_tsm_debug=yes])
AS_IF([test .$enable_recvmsg_debug = .], [enable_recvmsg_debug=yes])
AS_IF([test .$enable_track_process_debug = .], [enable_track_process_debug=yes])
AS_IF([test .$enable_checksum_debug = .], [enable_checksum_debug=yes])
AS_IF([test .$enable_netlink_timers = .], [enable_netlink_timers=yes])
AS_IF([test .$enable_network_timestamp = .], [enable_network_timestamp=yes])
])
AS_IF([test .$enable_lvs != .no],
[
AS_IF([test .$enable_checker_debug = .], [enable_checker_debug=yes])
AS_IF([test .$enable_regex = .yes],
[
AS_IF([test .$enable_regex_timers = .], [enable_regex_timers=yes])
AS_IF([test .$enable_regex_debug = .], [enable_regex_debug=yes])
])
])
AS_IF([test .$enable_mem_check = .yes],
[
AS_IF([test .$enable_mem_err_debug = .], [enable_mem_err_debug=yes])
])
])
dnl --with-run-dir duplicates standard --runstatedir
AS_IF([test .$with_run_dir != .], [AC_MSG_ERROR([--with-run-dir is deprecated, use --runstatedir=${with_run_dir}/run instead])])
dnl -- Do we want -Wcast-align=strict?
AS_IF([test .$enable_strict_cast_align = .yes],
[WARNINGS_STD=`echo $WARNINGS_STD | sed -e "s/cast-align /cast-align=strict /"`])
#### find the actual value for $datadir that we'll end up with
## (I know this is broken and should be done in the Makefile, but
## that's a major pain and almost nobody actually seems to care)
## In fact the "Built Sources Example" section of the automake
## manual suggests using configure as an option.
AS_AC_EXPAND(EXPANDED_DATADIR, "$datadir")
AS_IF([test .$with_dbus_data_dir != .],
[DBUS_DATADIR=$with_dbus_data_dir], [DBUS_DATADIR=$EXPANDED_DATADIR])
AC_SUBST(DBUS_DATADIR)
AC_DEFINE_UNQUOTED(DBUS_DATADIR,"$DBUS_DATADIR", [Directory for installing DBUS data files])
dnl We want /run to be the default runstatedir, not ${localstatedir}/run which defaults to /usr/local/var/run
dnl We want to know if --runstatedir or equivalent was specified
echo "$ac_configure_args" | grep -q "'--r"
RUNSTATEDIR_SPECIFIED=$?
AS_IF([test $RUNSTATEDIR_SPECIFIED -eq 1],
[
echo "$ac_configure_args" | grep -q "'-runstatedir"
RUNSTATEDIR_SPECIFIED=$?
])
AS_IF([test $RUNSTATEDIR_SPECIFIED -eq 0],
[AS_AC_EXPAND(RUNSTATEDIR, "$runstatedir")],
[RUNSTATEDIR=/run])
AC_DEFINE_UNQUOTED(RUNSTATEDIR, "$RUNSTATEDIR", [Directory for runtime state files])
GCC_LTO=no
AS_IF([test $CC = gcc],
[
dnl -- check if we are using LTO. There is a GCC bug which means that when addattr_l()
dnl -- is inlined, GCC (up to at least v11.1.1) ignores RELAX_STRINGOP_OVERFLOW and issues
dnl -- -Wstringop-overflow warnings
dnl -- I haven't been able to produce a test case to demonstrate this GCC bug, so we can't
dnl -- test it here, nor have I been able to report a bug upstream to GCC.
AC_MSG_CHECKING([if using GCC Link Time Optimisation])
echo " $CFLAGS " | grep -q -- " -flto=auto "
AS_IF([test $? -eq 0],
[
AC_MSG_RESULT([yes])
GCC_LTO=yes
], [
AC_MSG_RESULT([no])
])
])
AS_IF([test $GCC_LTO = yes],
[AC_DEFINE([GCC_LTO_NOINLINE], [ __attribute__((noinline)) ], [Define to not inline if using GCC LTO])],
[AC_DEFINE([GCC_LTO_NOINLINE], [], [Define to not inline if using GCC LTO])])
dnl -- ulibc/glibc differences
AC_MSG_CHECKING([msghdr.msg_controllen is size_t])
SAV_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include <sys/socket.h>
#include <stdio.h>
int main(void)
{
struct msghdr msgh = { .msg_controllen = 0 };
printf("%zu", msgh.msg_controllen);
}
]])],
[
AC_MSG_RESULT([yes])
AC_DEFINE([PRI_MSG_CONTROLLEN], [ "zu" ], [Define to zu if msghdr.msg_controllen is size_t, else u])
],
[
AC_MSG_RESULT([no])
AC_DEFINE([PRI_MSG_CONTROLLEN], [ "u" ], [Define to zu if msghdr.msg_controllen is size_t, else u])
])
CFLAGS=$SAV_CFLAGS
dnl -- Check for diagnostic pragmas in functions - GCC 4.6.0
AC_MSG_CHECKING([diagnostic pragmas in functions])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
int main(void)
{
_Pragma("GCC diagnostic warning \"-Wall\"")
}
]])],
[
AC_MSG_RESULT([yes])
AC_DEFINE([_HAVE_FUNCTION_DIAGNOSTIC_PRAGMAS_], [ 1 ], [Define to 1 if can have _Pragma GCC diagnostic in functions])
],
[
AC_MSG_RESULT([no])
])
AM_CONDITIONAL([DEBUG], [test .$enable_debug = .yes])
dnl -- Check for diagnostic push/pop pragmas - GCC 4.6.0
AC_MSG_CHECKING([diagnostic push/pop pragmas])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
int main(void)
{
_Pragma("GCC diagnostic push")
}
]])],
[
AC_MSG_RESULT([yes])
AC_DEFINE([_HAVE_DIAGNOSTIC_PUSH_POP_PRAGMAS_], [ 1 ], [Define to 1 if can have _Pragma GCC diagnostic push/pop])
],
[
AC_MSG_RESULT([no])
])
dnl - Set up warnings list
AS_IF([test ".$enable_warnings" = .no],
[WARNINGS_ENABLED=$WARNINGS_BASIC],
[WARNINGS_ENABLED="$WARNINGS_BASIC $WARNINGS_STD"
AS_IF([test ".$enable_warnings" != .yes],
[WARN_LIST=`echo $enable_warnings | sed -e "s/-W//g"`
add_to_var([WARNINGS_ENABLED], ["$WARN_LIST"])
])
]
)
AS_IF([test .$enable_extra_warnings = .yes],
[add_to_var([WARNINGS_ENABLED], ["$WARNINGS_EXTRA"])])
if test "$enable_conversion_checks" = yes; then
# Check if we can sensibly enable -Wconversion
AC_MSG_CHECKING([for usable -Wconversion])
SAV_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wconversion -O2 -Wp,-D_FORTIFY_SOURCE=2 -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include <sys/types.h>
#include <sys/select.h>
#include <stdint.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <linux/rtnetlink.h>
#define VAL 255
static void
fun(uint8_t val)
{
}
int main(void)
{
fd_set set;
uint8_t val = 42;
unsigned u;
bool b;
size_t size = 17;
char c[2];
char *c_ptr = c;
struct rtattr rta;
struct rtattr *rta_p = &rta;
FD_SET(argc+1, &set);
fun(argc == VAL ? VAL : val);
// vrrp->lower_prio_no_advert = vrrp->strict_mode ? true : global_data->vrrp_lower_prio_no_advert;
u = u ? true : b;
size = RTA_LENGTH(size);
c_ptr = RTA_DATA(c_ptr);
rta_p = RTA_NEXT(rta_p, size);
val = (u < 256 ) ? u & 0xff : 0;
}
]])],
[
AC_MSG_RESULT([yes])
add_to_var([WARNINGS_ENABLED], [conversion])
],
[
AC_MSG_RESULT([no])
AC_MSG_WARN([-Wconversion is not sensible with this compiler. Use --enable-force-conversion-checks to override.])
])
CFLAGS="$SAV_CFLAGS"
elif test "$enable_force_conversion_checks" = yes; then
add_to_var([WARNINGS_ENABLED], [conversion])
fi
if test "$enable_Werror" = yes; then
add_to_var([WARNINGS_ENABLED], [error])
fi
CONFIG_WARNINGS=$SRC_DIR/lib/config_warnings.h.in
SAV_CFLAGS="$CFLAGS"
for WARN in $WARNINGS_ENABLED
do
AC_MSG_CHECKING([for -W$WARN])
CFLAGS="$SAV_CFLAGS -W$WARN -Werror"
WARN_VAR=_HAVE_WARNING_`echo $WARN | tr "a-z=-" "A-Z__"`_
LOCAL_WARN_VAR=HAVE_WARNING_`echo $WARN | sed -e "s/=.*//" | tr "a-z-" "A-Z_"`
grep -q "^#undef $WARN_VAR$" $CONFIG_WARNINGS
AS_IF([test $? -ne 0],
[echo -e "\n/* Define to 1 if -W$WARN in use */\n#undef $WARN_VAR" >>$CONFIG_WARNINGS]
)
test `echo $WARN | grep "=[[0-9]][[0-9]]*$"`
AS_IF([test $? -eq 0],
[ WARN_SHORT=`echo $WARN | sed -e 's/=[[0-9]][[0-9]]*$//'`
WARN_VAR_SHORT=_HAVE_WARNING_`echo $WARN_SHORT | tr "a-z=-" "A-Z__"`_
grep -q "^#undef $WARN_VAR_SHORT$" $CONFIG_WARNINGS
AS_IF([test $? -ne 0],
[echo -e "\n/* Define to 1 if -W$WARN_SHORT in use */\n#undef $WARN_VAR_SHORT" >>$CONFIG_WARNINGS]
)
],
[ unset WARN_VAR_SHORT ]
)
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
int main(void)
{
}
]])],
[
# gcc 9 removed -Wchkp and doesn't error if it is specified,
# but rather outputs:
# warning: switch '-Wchkp' is no longer supported
# so check for the warning.
touch conftest.err
grep -q "is no longer supported" conftest.err
AS_IF([test $? -ne 0],
[
AC_MSG_RESULT([yes])
eval $LOCAL_WARN_VAR=yes
add_to_var([KA_CFLAGS], [-W$WARN])
AC_DEFINE_UNQUOTED([$WARN_VAR], [ 1 ])
AS_IF([test -z "$WARN_VAR_SHORT"], [],
[AC_DEFINE_UNQUOTED([$WARN_VAR_SHORT], [ 1 ])]
)
],
[
AC_MSG_RESULT([no])
eval $LOCAL_WARN_VAR=no
])
],
[
AC_MSG_RESULT([no])
eval $LOCAL_WARN_VAR=no
])
done
AS_IF([test .$HAVE_WARNING_STRICT_OVERFLOW = .yes],
[
# The following is not supported in gcc 5.4.0
CFLAGS="$CFLAGS -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
_Pragma("GCC diagnostic warning \"-Wstrict-overflow=1\"")
int main(void)
{
}
]])],
[AC_DEFINE([_HAVE_PRAGMA_WARN_STRICT_OVERFLOW_1_], [ 1 ], [Define to 1 if _Pragma("GCC diagnostic warning \"-Wstrict-overflow=1\"") supported])
])
]
)
CFLAGS="$SAV_CFLAGS"
# keepalived is not suitable for assuming strict aliasing (it does a lot of type casting)
add_to_var([KA_CFLAGS], [-fno-strict-aliasing])
dnl ---- [ Is function __attribute__((error(msg))) supported? ] ----
AC_MSG_CHECKING([for function __attribute__((error(msg))) support])
AC_COMPILE_IFELSE(
[
AC_LANG_PROGRAM(
[[
#include <stdio.h>
static int func(int i) __attribute__((error("deliberate-error")));
static int func(int i)
{
return i * 2;
}
]],
[[
int i = func(2);
printf("%d", i);
]]
)
],
[
dnl -- The logic is inverted here. If the attribute is supported,
dnl -- the compilation will fail!
AC_MSG_RESULT([no])
],
[
AC_MSG_RESULT([yes])
AC_DEFINE([_HAVE_FUNCTION_ATTRIBUTE_ERROR_], [ 1 ], [Define to 1 if function __attribute__((error(msg))) supported])
])
SAV_CFLAGS="$CFLAGS"
CFLAGS="$SAV_CFLAGS -Werror=attributes"
dnl ---- [ Is function __attribute__((warn_unused_result)) supported? ] ----
AC_MSG_CHECKING([for function __attribute__((warn_unused_result)) support])
AC_COMPILE_IFELSE(
[
AC_LANG_PROGRAM(
[[
#include <stdio.h>
static int func(int i) __attribute__((warn_unused_result));
static int func(int i)
{
return i * 2;
}
]],
[[
func(2);
printf("%d", 2);
]]
)
],
[
AC_MSG_RESULT([yes])
AC_DEFINE([_HAVE_FUNCTION_WARN_UNUSED_RESULTS_], [ 1 ], [Define to 1 if function __attribute__((warn_unused_results)) supported])
],
[
AC_MSG_RESULT([no])
])
CFLAGS="$SAV_CFLAGS"
dnl ---- [ Do we want stricter configuration checking? ] ----
STRICT_CONFIG=No
if test "$enable_strict_config_checks" = yes; then
AC_DEFINE([_STRICT_CONFIG_], [ 1 ], [Define to 1 if want stricter configuration checking])
STRICT_CONFIG=Yes
add_config_opt([STRICT_CONFIG])
fi
AM_CONDITIONAL([WITH_STRICT_CONFIG_CHECKS], [test $STRICT_CONFIG = Yes])
if test "$enable_hardening" != no; then
AC_MSG_CHECKING([for PIE support])
SAV_CFLAGS="$CFLAGS"
SAV_LDFLAGS="$LDFLAGS"
CFLAGS="$CFLAGS -fPIE"
if test "${enable_profile}" = yes; then
# RHEL 7 and others have a problem with profiling with PIE
CFLAGS="$CFLAGS -pg"
fi
LDFLAGS="$LDFLAGS -pie"
AC_LINK_IFELSE([AC_LANG_SOURCE([[
int main(void)
{
int i = 0;
}
]])],
AC_MSG_RESULT([yes])
add_to_var([KA_CFLAGS], [-fPIE])
add_to_var([KA_LDFLAGS], [-pie]),
AC_MSG_RESULT([no]))
CFLAGS=$SAV_CFLAGS
LDFLAGS=$SAV_LDFLAGS
for FLAG in \
"-Wformat -Werror=format-security" \
"-Wp,-D_FORTIFY_SOURCE=2" \
"-fexceptions" \
"-fstack-protector-strong" \
"--param=ssp-buffer-size=4" \
"-grecord-gcc-switches"
do
AC_MSG_CHECKING([for $FLAG support])
CFLAGS="$CFLAGS $FLAG"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([[ ]])],
[AC_MSG_RESULT([yes])]
add_to_var([KA_CFLAGS], [$FLAG]),
[AC_MSG_RESULT([no])])
CFLAGS=$SAV_CFLAGS
done
WL_FLAGS=
for FLAG in \
"-z,relro" \
"-z,now"
do
AC_MSG_CHECKING([for -Wl,$FLAG support])
LDFLAGS="$LDFLAGS -Wl,$FLAG"
AC_LINK_IFELSE(
[AC_LANG_SOURCE([[
int main(void)
{
int i = 0;
}
]])],
[
AC_MSG_RESULT([yes])
WL_FLAGS="$WL_FLAGS -Wl,$FLAG"
],
[AC_MSG_RESULT([no])]
)
CFLAGS=$SAV_CFLAGS
LDFLAGS=$SAV_LDFLAGS
done
if test -n "$WL_FLAGS"; then
add_to_var([KA_LDFLAGS], [$WL_FLAGS])
fi
fi
# enable-optimise
AS_IF([test "$enable_optimise" = yes -o "$enable_optimise" = not-specified], [optimise_level=2], [optimise_level=$enable_optimise])
AS_IF([test "$enable_optimise" = no], [optimise_level=0])
AS_IF([test "$optimise_level" -eq 0],
[
echo $KA_CFLAGS | $GREP -q -- "-D_FORTIFY_SOURCE=[[^0]]"
AS_IF([test $? -eq 0], [AC_MSG_WARN([--disable-optimise requires --disable-hardening])])
])
FLAG="-O$optimise_level"
AC_MSG_CHECKING([for $FLAG support])
SAV_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS $FLAG"
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([[ ]])],
[AC_MSG_RESULT([yes])]
add_to_var([KA_CFLAGS], [$FLAG]),
[
AC_MSG_RESULT([no])
AS_IF([test "$enable_optimise" != not-specified], [AC_MSG_ERROR([Invalid optimisation level specified])])
])
CFLAGS=$SAV_CFLAGS
AC_SUBST(KA_CPPFLAGS)
AC_SUBST(KA_CFLAGS)
AC_SUBST(KA_LDFLAGS)
AC_SUBST(KA_LIBS)
# AC_SUBST(KA_LIBTOOLFLAGS)
# Check for fallthrough attribute
echo CFLAGS=$KA_CFLAGS
SAV_CFLAGS=$CFLAGS
CFLAGS="$KA_CFLAGS -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
int main(int argc, char **argv)
{
switch(argc) {
case 1:
argv[0][0] = argv[0][1];
[[fallthrough]];
case 2:
argv[1][0] = argv[1][1];
break;
}
}
]])],
[
AC_DEFINE([__fallthrough], [ [[[fallthrough]]] ], [Define fallthrough attribute])
],
[
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
int main(int argc, char **argv)