configure.ac

#
# Copyright (C) - Tobias Brunner
# Copyright (C) - Andreas Steffen
# Copyright (C) - Martin Willi
# Hochschule fuer Technik Rapperswil
#
# This program 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  of the License, or (at your
# option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
#
# 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.
#

# ============================
#  initialize & set some vars
# ============================

//AC_INIT (package, version, [bug-report], [tarname], [url])
AC_INIT([strongSwan],[5.1.])

//tar-ustar 指make dist生成的格式
//subdir-objects 指定目标将生成在源码目录下，如源码是subdir/file.cxx, 然后输出文件将是besubdir/file.o.
AM_INIT_AUTOMAKE([tar-ustar subdir-objects])

//Enable silent build when available (Automake 1.11)
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])

//表示宏存放的文件夹
AC_CONFIG_MACRO_DIR([m4/config])

//用于生成config.h文件，以便autoheader使用
AC_CONFIG_HEADERS([config.h])

//定义C/C++的宏
AC_DEFINE([CONFIG_H_INCLUDED], [], [defined if config.h included])

//pkg-config
PKG_PROG_PKG_CONFIG

//包含自定义宏文件
m4_include(m4/macros/split-package-version.m4)
SPLIT_PACKAGE_VERSION

# =================================
#  check --enable-xxx & --with-xxx
# =================================

//包含自定义的宏文件
m4_include(m4/macros/with.m4)

//ARG_WITH_SUBST宏定义在with.m4
ARG_WITH_SUBST([random-device],      [/dev/random], [set the device to read real random data from])
ARG_WITH_SUBST([urandom-device],     [/dev/urandom], [set the device to read pseudo random data from])
ARG_WITH_SUBST([strongswan-conf],    [${sysconfdir}/strongswan.conf], [set the strongswan.conf file location])
ARG_WITH_SUBST([resolv-conf],        [${sysconfdir}/resolv.conf], [set the file to use in DNS handler plugin])
ARG_WITH_SUBST([piddir],             [/var/run], [set path for PID and UNIX socket files])
ARG_WITH_SUBST([ipsecdir],           [${libexecdir%/}/ipsec], [set installation path for ipsec tools])
ARG_WITH_SUBST([ipseclibdir],        [${libdir%/}/ipsec], [set installation path for ipsec libraries])
ARG_WITH_SUBST([plugindir],          [${ipseclibdir%/}/plugins], [set the installation path of plugins])
ARG_WITH_SUBST([imcvdir],            [${ipseclibdir%/}/imcvs], [set the installation path of IMC and IMV dynamic librariers])
ARG_WITH_SUBST([nm-ca-dir],          [/usr/share/ca-certificates], [directory the NM backend uses to look up trusted root certificates])
ARG_WITH_SUBST([linux-headers],      [\${top_srcdir}/src/include], [set directory of linux header files to use])
ARG_WITH_SUBST([routing-table],      [], [set routing table to use for IPsec routes])
ARG_WITH_SUBST([routing-table-prio], [], [set priority for IPsec routing table])
ARG_WITH_SUBST([ipsec-script],       [ipsec], [change the name of the ipsec script])
ARG_WITH_SUBST([fips-mode],          [], [set openssl FIPS mode: disabled(), enabled(), Suite B enabled()])

//ARG_WITH_SET宏定义在with.m4
ARG_WITH_SET([tss],                  [no], [set implementation of the Trusted Computing Group's Software Stack (TSS). Currently the only supported value is "trousers"])
ARG_WITH_SET([capabilities],         [no], [set capability dropping library. Currently supported values are "libcap" and "native"])
ARG_WITH_SET([mpz_powm_sec],         [yes], [use the more side-channel resistant mpz_powm_sec in libgmp, if available])
ARG_WITH_SET([dev-headers],          [no], [install strongSwan development headers to directory.])

if test -n "$PKG_CONFIG"; then
    systemdsystemunitdir_default=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)
fi
ARG_WITH_SET([systemdsystemunitdir], [$systemdsystemunitdir_default], [directory for systemd service files])
AM_CONDITIONAL(HAVE_SYSTEMD, [test -n "$systemdsystemunitdir" -a "x$systemdsystemunitdir" != xno])
AC_SUBST(systemdsystemunitdir)

//AC_ARG_WITH (package, help-string, [action-if-given], [action-if-not-given])
//AC_SUBST输出一个变量 AC_SUBST (variable, [value])
//AS_HELP_STRING (left-hand-side, right-hand-side [indent-column = ‘26’], [wrap-column = ‘79’])
AC_ARG_WITH(
    [user],
    AS_HELP_STRING([--with-user=user],[change user of the daemons to "user" after startup (default is "root").]),
    [AC_DEFINE_UNQUOTED([IPSEC_USER], "$withval", [username to run daemon with])
     AC_SUBST(ipsecuser, "$withval")],
    [AC_SUBST(ipsecuser, "root")]
)

AC_ARG_WITH(
    [group],
    AS_HELP_STRING([--with-group=group],[change group of the daemons to "group" after startup (default is "root").]),
    [AC_DEFINE_UNQUOTED(IPSEC_GROUP, "$withval", [groupname to run daemon with])
     AC_SUBST(ipsecgroup, "$withval")],
    [AC_SUBST(ipsecgroup, "root")]
)

AC_ARG_WITH(
    [charon-udp-port],
    AS_HELP_STRING([--with-charon-udp-port=port],[UDP port used by charon locally (default ). Set to  to allocate randomly.]),
    [AC_DEFINE_UNQUOTED(CHARON_UDP_PORT, [$withval], [UDP port used by charon locally])
     AC_SUBST(charon_udp_port, [$withval])],
    [AC_SUBST(charon_udp_port, )]
)

AC_ARG_WITH(
    [charon-natt-port],
    AS_HELP_STRING([--with-charon-natt-port=port],[UDP port used by charon locally in case a NAT is detected (must be different from charon-udp-port, default ). Set to  to allocate randomly.]),
    [AC_DEFINE_UNQUOTED(CHARON_NATT_PORT, [$withval], [UDP post used by charon locally in case a NAT is detected])
     AC_SUBST(charon_natt_port, [$withval])],
    [AC_SUBST(charon_natt_port, )]
)

//AC_MSG_CHECKING (feature-description)
//AC_MSG_ERROR (error-description, [exit-status = ‘$?/1’])
//AC_MSG_RESULT (result-description)
AC_MSG_CHECKING([configured UDP ports ($charon_udp_port, $charon_natt_port)])
if test x$charon_udp_port != x0 -a x$charon_udp_port = x$charon_natt_port; then
    AC_MSG_ERROR(the ports have to be different)
else
    AC_MSG_RESULT(ok)
fi

# convert script name to uppercase
AC_SUBST(ipsec_script_upper, [`echo -n "$ipsec_script" | tr a-z A-Z`])

m4_include(m4/macros/enable-disable.m4)

ARG_ENABL_SET([curl],           [enable CURL fetcher plugin to fetch files via libcurl. Requires libcurl.])
ARG_ENABL_SET([unbound],        [enable UNBOUND resolver plugin to perform DNS queries via libunbound. Requires libldns and libunbound.])
ARG_ENABL_SET([soup],           [enable soup fetcher plugin to fetch from HTTP via libsoup. Requires libsoup.])
ARG_ENABL_SET([ldap],           [enable LDAP fetching plugin to fetch files via libldap. Requires openLDAP.])
ARG_DISBL_SET([aes],            [disable AES software implementation plugin.])
ARG_DISBL_SET([des],            [disable DES/3DES software implementation plugin.])
ARG_ENABL_SET([blowfish],       [enable Blowfish software implementation plugin.])
ARG_DISBL_SET([rc2],            [disable RC2 software implementation plugin.])
ARG_ENABL_SET([md4],            [enable MD4 software implementation plugin.])
ARG_DISBL_SET([md5],            [disable MD5 software implementation plugin.])
ARG_DISBL_SET([sha1],           [disable SHA1 software implementation plugin.])
ARG_DISBL_SET([sha2],           [disable SHA256/SHA384/SHA512 software implementation plugin.])
ARG_DISBL_SET([fips-prf],       [disable FIPS PRF software implementation plugin.])
ARG_DISBL_SET([gmp],            [disable GNU MP (libgmp) based crypto implementation plugin.])
ARG_ENABL_SET([rdrand],         [enable Intel RDRAND random generator plugin.])
ARG_DISBL_SET([random],         [disable RNG implementation on top of /dev/(u)random.])
ARG_DISBL_SET([nonce],          [disable nonce generation plugin.])
ARG_DISBL_SET([x509],           [disable X509 certificate implementation plugin.])
ARG_DISBL_SET([revocation],     [disable X509 CRL/OCSP revocation check plugin.])
ARG_DISBL_SET([constraints],    [disable advanced X509 constraint checking plugin.])
ARG_DISBL_SET([pubkey],         [disable RAW public key support plugin.])
ARG_DISBL_SET([pkcs1],          [disable PKCS1 key decoding plugin.])
ARG_DISBL_SET([pkcs7],          [disable PKCS7 container support plugin.])
ARG_DISBL_SET([pkcs8],          [disable PKCS8 private key decoding plugin.])
ARG_DISBL_SET([pkcs12],         [disable PKCS12 container support plugin.])
ARG_DISBL_SET([pgp],            [disable PGP key decoding plugin.])
ARG_DISBL_SET([dnskey],         [disable DNS RR key decoding plugin.])
ARG_DISBL_SET([sshkey],         [disable SSH key decoding plugin.])
ARG_ENABL_SET([dnscert],        [enable DNSCERT authentication plugin.])
ARG_ENABL_SET([ipseckey],       [enable IPSECKEY authentication plugin.])
ARG_DISBL_SET([pem],            [disable PEM decoding plugin.])
ARG_DISBL_SET([hmac],           [disable HMAC crypto implementation plugin.])
ARG_DISBL_SET([cmac],           [disable CMAC crypto implementation plugin.])
ARG_DISBL_SET([xcbc],           [disable xcbc crypto implementation plugin.])
ARG_ENABL_SET([af-alg],         [enable AF_ALG crypto interface to Linux Crypto API.])
ARG_ENABL_SET([test-vectors],   [enable plugin providing crypto test vectors.])
ARG_ENABL_SET([mysql],          [enable MySQL database support. Requires libmysqlclient_r.])
ARG_ENABL_SET([sqlite],         [enable SQLite database support. Requires libsqlite3.])
ARG_DISBL_SET([stroke],         [disable charons stroke configuration backend.])
ARG_ENABL_SET([medsrv],         [enable mediation server web frontend and daemon plugin.])
ARG_ENABL_SET([medcli],         [enable mediation client configuration database plugin.])
ARG_ENABL_SET([smp],            [enable SMP configuration and control interface. Requires libxml.])
ARG_ENABL_SET([sql],            [enable SQL database configuration backend.])
ARG_ENABL_SET([leak-detective], [enable malloc hooks to find memory leaks.])
ARG_ENABL_SET([lock-profiler],  [enable lock/mutex profiling code.])
ARG_ENABL_SET([unit-tester],    [enable unit tests on IKEv2 daemon startup.])
ARG_ENABL_SET([load-tester],    [enable load testing plugin for IKEv2 daemon.])
ARG_ENABL_SET([eap-sim],        [enable SIM authentication module for EAP.])
ARG_ENABL_SET([eap-sim-file],   [enable EAP-SIM backend based on a triplet file.])
ARG_ENABL_SET([eap-sim-pcsc],   [enable EAP-SIM backend based on a smartcard reader. Requires libpcsclite.])
ARG_ENABL_SET([eap-aka],        [enable EAP AKA authentication module.])
ARG_ENABL_SET([eap-aka-3gpp2],  [enable EAP AKA backend implementing 3GPP2 algorithms in software. Requires libgmp.])
ARG_ENABL_SET([eap-simaka-sql], [enable EAP-SIM/AKA backend based on a triplet/quintuplet SQL database.])
ARG_ENABL_SET([eap-simaka-pseudonym], [enable EAP-SIM/AKA pseudonym storage plugin.])
ARG_ENABL_SET([eap-simaka-reauth],    [enable EAP-SIM/AKA reauthentication data storage plugin.])
ARG_ENABL_SET([eap-identity],   [enable EAP module providing EAP-Identity helper.])
ARG_ENABL_SET([eap-md5],        [enable EAP MD5 (CHAP) authentication module.])
ARG_ENABL_SET([eap-gtc],        [enable EAP GTC authentication module.])
ARG_ENABL_SET([eap-mschapv2],   [enable EAP MS-CHAPv2 authentication module.])
ARG_ENABL_SET([eap-tls],        [enable EAP TLS authentication module.])
ARG_ENABL_SET([eap-ttls],       [enable EAP TTLS authentication module.])
ARG_ENABL_SET([eap-peap],       [enable EAP PEAP authentication module.])
ARG_ENABL_SET([eap-tnc],        [enable EAP TNC trusted network connect module.])
ARG_ENABL_SET([eap-dynamic],    [enable dynamic EAP proxy module.])
ARG_ENABL_SET([eap-radius],     [enable RADIUS proxy authentication module.])
ARG_DISBL_SET([xauth-generic],  [disable generic XAuth backend.])
ARG_ENABL_SET([xauth-eap],      [enable XAuth backend using EAP methods to verify passwords.])
ARG_ENABL_SET([xauth-pam],      [enable XAuth backend using PAM to verify passwords.])
ARG_ENABL_SET([xauth-noauth],   [enable XAuth pseudo-backend that does not actually verify or even request any credentials.])
ARG_ENABL_SET([tnc-ifmap],      [enable TNC IF-MAP module. Requires libxml])
ARG_ENABL_SET([tnc-pdp],        [enable TNC policy decision point module.])
ARG_ENABL_SET([tnc-imc],        [enable TNC IMC module.])
ARG_ENABL_SET([tnc-imv],        [enable TNC IMV module.])
ARG_ENABL_SET([tnccs-],       [enable TNCCS 1.1 protocol module. Requires libxml])
ARG_ENABL_SET([tnccs-],       [enable TNCCS 2.0 protocol module.])
ARG_ENABL_SET([tnccs-dynamic],  [enable dynamic TNCCS protocol discovery module.])
ARG_ENABL_SET([imc-test],       [enable IMC test module.])
ARG_ENABL_SET([imv-test],       [enable IMV test module.])
ARG_ENABL_SET([imc-scanner],    [enable IMC port scanner module.])
ARG_ENABL_SET([imv-scanner],    [enable IMV port scanner module.])
ARG_ENABL_SET([imc-os],         [enable IMC operating system module.])
ARG_ENABL_SET([imv-os],         [enable IMV operating system module.])
ARG_ENABL_SET([imc-attestation],[enable IMC attestation module.])
ARG_ENABL_SET([imv-attestation],[enable IMV attestation module.])
ARG_ENABL_SET([imc-swid],       [enable IMC swid module.])
ARG_ENABL_SET([imv-swid],       [enable IMV swid module.])
ARG_DISBL_SET([kernel-netlink], [disable the netlink kernel interface.])
ARG_ENABL_SET([kernel-pfkey],   [enable the PF_KEY kernel interface.])
ARG_ENABL_SET([kernel-pfroute], [enable the PF_ROUTE kernel interface.])
ARG_ENABL_SET([kernel-klips],   [enable the KLIPS kernel interface.])
ARG_ENABL_SET([kernel-libipsec],[enable the libipsec kernel interface.])
ARG_ENABL_SET([libipsec],       [enable user space IPsec implementation.])
ARG_DISBL_SET([socket-default], [disable default socket implementation for charon.])
ARG_ENABL_SET([socket-dynamic], [enable dynamic socket implementation for charon])
ARG_ENABL_SET([farp],           [enable ARP faking plugin that responds to ARP requests to peers virtual IP])
ARG_ENABL_SET([dumm],           [enable the DUMM UML test framework.])
ARG_ENABL_SET([fast],           [enable libfast (FastCGI Application Server w/ templates.])
ARG_ENABL_SET([manager],        [enable web management console (proof of concept).])
ARG_ENABL_SET([mediation],      [enable IKEv2 Mediation Extension.])
ARG_ENABL_SET([integrity-test], [enable integrity testing of libstrongswan and plugins.])
ARG_DISBL_SET([load-warning],   [disable the charon plugin load option warning in starter.])
ARG_DISBL_SET([ikev1],          [disable IKEv1 protocol support in charon.])
ARG_DISBL_SET([ikev2],          [disable IKEv2 protocol support in charon.])
ARG_DISBL_SET([charon],         [disable the IKEv1/IKEv2 keying daemon charon.])
ARG_DISBL_SET([tools],          [disable additional utilities (openac, scepclient and pki).])
ARG_DISBL_SET([scripts],        [disable additional utilities (found in directory scripts).])
ARG_ENABL_SET([conftest],       [enforce Suite B conformance test framework.])
ARG_DISBL_SET([updown],         [disable updown firewall script plugin.])
ARG_DISBL_SET([attr],           [disable strongswan.conf based configuration attribute plugin.])
ARG_ENABL_SET([attr-sql],       [enable SQL based configuration attribute plugin.])
ARG_ENABL_SET([dhcp],           [enable DHCP based attribute provider plugin.])
ARG_DISBL_SET([resolve],        [disable resolve DNS handler plugin.])
ARG_ENABL_SET([padlock],        [enables VIA Padlock crypto plugin.])
ARG_ENABL_SET([openssl],        [enables the OpenSSL crypto plugin.])
ARG_ENABL_SET([gcrypt],         [enables the libgcrypt plugin.])
ARG_ENABL_SET([agent],          [enables the ssh-agent signing plugin.])
ARG_ENABL_SET([keychain],       [enables OS X Keychain Services credential set.])
ARG_ENABL_SET([pkcs11],         [enables the PKCS11 token support plugin.])
ARG_ENABL_SET([ctr],            [enables the Counter Mode wrapper crypto plugin.])
ARG_ENABL_SET([ccm],            [enables the CCM AEAD wrapper crypto plugin.])
ARG_ENABL_SET([gcm],            [enables the GCM AEAD wrapper crypto plugin.])
ARG_ENABL_SET([addrblock],      [enables RFC  address block constraint support.])
ARG_ENABL_SET([unity],          [enables Cisco Unity extension plugin.])
ARG_ENABL_SET([uci],            [enable OpenWRT UCI configuration plugin.])
ARG_ENABL_SET([osx-attr],       [enable OS X SystemConfiguration attribute handler.])
ARG_ENABL_SET([android-dns],    [enable Android specific DNS handler.])
ARG_ENABL_SET([android-log],    [enable Android specific logger plugin.])
ARG_ENABL_SET([maemo],          [enable Maemo specific plugin.])
ARG_ENABL_SET([nm],             [enable NetworkManager backend.])
ARG_ENABL_SET([ha],             [enable high availability cluster plugin.])
ARG_ENABL_SET([whitelist],      [enable peer identity whitelisting plugin.])
ARG_ENABL_SET([lookip],         [enable fast virtual IP lookup and notification plugin.])
ARG_ENABL_SET([error-notify],   [enable error notification plugin.])
ARG_ENABL_SET([certexpire],     [enable CSV export of expiration dates of used certificates.])
ARG_ENABL_SET([systime-fix],    [enable plugin to handle cert lifetimes with invalid system time gracefully.])
ARG_ENABL_SET([led],            [enable plugin to control LEDs on IKEv2 activity using the Linux kernel LED subsystem.])
ARG_ENABL_SET([duplicheck],     [advanced duplicate checking plugin using liveness checks.])
ARG_ENABL_SET([coupling],       [enable IKEv2 plugin to couple peer certificates permanently to authentication.])
ARG_ENABL_SET([radattr],        [enable plugin to inject and process custom RADIUS attributes as IKEv2 client.])
ARG_ENABL_SET([vstr],           [enforce using the Vstr string library to replace glibc-like printf hooks.])
ARG_ENABL_SET([monolithic],     [build monolithic version of libstrongswan that includes all enabled plugins. Similarly, the plugins of charon are assembled in libcharon.])
ARG_ENABL_SET([bfd-backtraces], [use binutils libbfd to resolve backtraces for memory leaks and segfaults.])
ARG_ENABL_SET([unwind-backtraces],[use libunwind to create backtraces for memory leaks and segfaults.])
ARG_ENABL_SET([unit-tests],     [enable unit tests using the check test framework.])
ARG_ENABL_SET([coverage],       [enable lcov coverage report generation.])
ARG_ENABL_SET([tkm],            [enable Trusted Key Manager support.])
ARG_ENABL_SET([cmd],            [enable the command line IKE client charon-cmd.])

# ===================================
#  option to disable default options
# ===================================

ARG_DISBL_SET([defaults],       [disable all default plugins (they can be enabled with their respective --enable options)])

if test x$defaults = xfalse; then
    for option in $enabled_by_default; do
        eval test x\${${option}_given} = xtrue && continue
        let $option=false
    done
fi

# ===========================
#  set up compiler and flags
# ===========================

//test –z 字符串   字符串的长度为零
if test -z "$CFLAGS"; then
    CFLAGS="-g -O2 -Wall -Wno-format -Wno-pointer-sign"
fi
//这个宏将检查系统所用的C编译器
AC_PROG_CC
AM_PROG_CC_C_O

AC_LIB_PREFIX
AC_C_BIGENDIAN

# =========================
#  check required programs
# =========================

//配置使用了libtool
LT_INIT
//如果在当前PATH中找到了一个与BSD兼容的install程序，就把输出变量INSTALL设置成到该程序的路径。
AC_PROG_INSTALL
//Check whether $GREP -E works
AC_PROG_EGREP
//Check for gawk, mawk, nawk, and awk
AC_PROG_AWK
//If flex is found, set output variable LEX to ‘flex’ and LEXLIB to -lfl
AC_PROG_LEX
//If bison is found, set output variable YACC to ‘bison -y’.
AC_PROG_YACC
//AC_PATH_PROG (variable, prog-to-check-for, [value-if-not-found], [path = ‘$PATH’])
AC_PATH_PROG([PERL], [perl], [], [$PATH:/bin:/usr/bin:/usr/local/bin])
AC_PATH_PROG([GPERF], [gperf], [], [$PATH:/bin:/usr/bin:/usr/local/bin])

# because gperf is not needed by end-users we just report it but do not abort on failure
// AC_MSG_CHECKING (feature-description)
AC_MSG_CHECKING([gperf version >= 3.0.])
//如果文件可执行，则为真
if test -x "$GPERF"; then
    if test "`$GPERF --version | $AWK -F' ' '/^GNU gperf/ { print $3 }' | $AWK -F. '{ print $1 }'`" -ge ""; then
        //print the result of the check
        AC_MSG_RESULT([yes])
    else
        AC_MSG_RESULT([no])
    fi
else
    AC_MSG_RESULT([not found])
fi

# ========================
#  dependency calculation
# ========================
//前面加X好象是防止$xauth_generic_given为空  -a 是且的意思
if test x$xauth_generic_given = xfalse -a x$ikev1 = xfalse; then
    xauth_generic=false;
fi

if test x$kernel_libipsec = xtrue; then
    libipsec=true;
fi

if test x$eap_aka_3gpp2 = xtrue; then
    gmp=true;
fi

if test x$eap_aka = xtrue; then
    fips_prf=true;
    simaka=true;
fi

if test x$eap_sim = xtrue; then
    fips_prf=true;
    simaka=true;
fi

if test x$eap_radius = xtrue -o x$radattr = xtrue -o x$tnc_pdp = xtrue; then
    radius=true;
fi

if test x$tnc_imc = xtrue -o x$tnc_imv = xtrue -o x$tnccs_11 = xtrue -o x$tnccs_11 = xtrue -o x$tnccs_dynamic = xtrue -o x$eap_tnc = xtrue; then
    tnc_tnccs=true;
fi

if test x$eap_tls = xtrue -o x$eap_ttls = xtrue -o x$eap_peap = xtrue -o x$tnc_tnccs = xtrue; then
    tls=true;
fi

if test x$imc_test = xtrue -o x$imv_test = xtrue -o x$imc_scanner = xtrue -o x$imv_scanner = xtrue -o x$imc_os = xtrue -o x$imv_os = xtrue -o x$imc_attestation = xtrue -o x$imv_attestation = xtrue -o x$imc_swid = xtrue -o x$imv_swid = xtrue; then
    imcv=true;
fi

if test x$imc_attestation = xtrue -o x$imv_attestation = xtrue -o x$imc_swid = xtrue -o x$imv_swid = xtrue; then
    pts=true;
fi

if test x$fips_prf = xtrue; then
    if test x$openssl = xfalse; then
        sha1=true;
    fi
fi

if test x$smp = xtrue -o x$tnccs_11 = xtrue -o x$tnc_ifmap = xtrue; then
    xml=true
fi

if test x$manager = xtrue; then
    fast=true
fi

if test x$medsrv = xtrue; then
    mediation=true
    fast=true
fi

if test x$medcli = xtrue; then
    mediation=true
fi

if test x$coverage = xtrue; then
    unit_tests=true
fi

# ===========================================
#  check required libraries and header files
# ===========================================
//用于检测stdbool.h的可用性和C99的bool类型是否存在
AC_HEADER_STDBOOL
//如果本宏找到了`alloca.h'，它就定义HAVE_ALLOCA_H
AC_FUNC_ALLOCA
//If strerror_r is available, define HAVE_STRERROR_R
AC_FUNC_STRERROR_R

#  libraries needed on some platforms but not on others
# ------------------------------------------------------
saved_LIBS=$LIBS

//AC_SEARCH_LIBS (function, search-libs, [action-if-found], [action-if-not-found], [other-libraries])
//AC_SUBST (variable, [value])  Create an output variable from a shell variable
# FreeBSD and Mac OS X have dlopen integrated in libc, Linux needs libdl
LIBS=""
AC_SEARCH_LIBS(dlopen, dl, [DLLIB=$LIBS])
AC_SUBST(DLLIB)

//AC_CHECK_FUNCS (function..., [action-if-found], [action-if-not-found])
# glibc's backtrace() can be replicated on FreeBSD with libexecinfo
LIBS=""
AC_SEARCH_LIBS(backtrace, execinfo, [BTLIB=$LIBS])
AC_CHECK_FUNCS(backtrace)
AC_SUBST(BTLIB)

// AC_CHECK_LIB (library, function, [action-if-found], [action-if-not-found], [other-libraries])
# OpenSolaris needs libsocket and libnsl for socket()
LIBS=""
AC_SEARCH_LIBS(socket, socket, [SOCKLIB=$LIBS],
    [AC_CHECK_LIB(nsl, socket, [SOCKLIB="-lsocket -lnsl"], [], [-lsocket])]
)
AC_SUBST(SOCKLIB)

# FreeBSD has clock_gettime in libc, Linux needs librt
LIBS=""
AC_SEARCH_LIBS(clock_gettime, rt, [RTLIB=$LIBS])
AC_CHECK_FUNCS(clock_gettime)
AC_SUBST(RTLIB)

# Android has pthread_* functions in bionic (libc), others need libpthread
LIBS=""
AC_SEARCH_LIBS(pthread_create, pthread, [PTHREADLIB=$LIBS])
AC_SUBST(PTHREADLIB)

LIBS=$saved_LIBS
# ------------------------------------------------------

//AC_MSG_CHECKING (feature-description)  Notify the user that configure is checking for a particular feature.
//AC_COMPILE_IFELSE (input, [action-if-true], [action-if-false])
//AC_DEFINE (variable, value, [description])
//AC_LANG_PROGRAM (prologue, body)
AC_MSG_CHECKING(for dladdr)
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
        [[#define _GNU_SOURCE
          #include <dlfcn.h>]],
        [[Dl_info* info = ;
          dladdr(, info);]])],
    [AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_DLADDR], [], [have dladdr()])],
    [AC_MSG_RESULT([no])]
)

# check if pthread_condattr_setclock(CLOCK_MONOTONE) is supported
// AC_RUN_IFELSE (input, [action-if-true], [action-if-false], [action-if-cross-compiling = ‘AC_MSG_FAILURE’])
saved_LIBS=$LIBS
LIBS=$PTHREADLIB
AC_MSG_CHECKING([for pthread_condattr_setclock(CLOCK_MONOTONE)])
AC_RUN_IFELSE(
    [AC_LANG_SOURCE(
        [[#include <pthread.h>
          int main() { pthread_condattr_t attr;
            pthread_condattr_init(&attr);
            return pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);}]])],
    [AC_MSG_RESULT([yes]);
     AC_DEFINE([HAVE_CONDATTR_CLOCK_MONOTONIC], [],
               [pthread_condattr_setclock supports CLOCK_MONOTONIC])],
    [AC_MSG_RESULT([no])],
    # Check existence of pthread_condattr_setclock if cross-compiling
    [AC_MSG_RESULT([unknown]);
     AC_CHECK_FUNCS(pthread_condattr_setclock,
        [AC_DEFINE([HAVE_CONDATTR_CLOCK_MONOTONIC], [],
                   [have pthread_condattr_setclock()])]
    )]
)
//AC_CHECK_FUNCS (function..., [action-if-found], [action-if-not-found])
# check if we actually are able to configure attributes on cond vars
AC_CHECK_FUNCS(pthread_condattr_init)
# instead of pthread_condattr_setclock Android has this function
AC_CHECK_FUNCS(pthread_cond_timedwait_monotonic)
# check if we can cancel threads
AC_CHECK_FUNCS(pthread_cancel)
# check if native rwlocks are available
AC_CHECK_FUNCS(pthread_rwlock_init)
# check if pthread spinlocks are available
AC_CHECK_FUNCS(pthread_spin_init)
# check if we have POSIX semaphore functions, including timed-wait
AC_CHECK_FUNCS(sem_timedwait)
LIBS=$saved_LIBS

//AC_CHECK_FUNC (function, [action-if-found], [action-if-not-found])
AC_CHECK_FUNC(
    [gettid],
    [AC_DEFINE([HAVE_GETTID], [], [have gettid()])],
    [AC_MSG_CHECKING([for SYS_gettid])
     AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#define _GNU_SOURCE
              #include <unistd.h>
              #include <sys/syscall.h>]],
            [[int main() {
              return syscall(SYS_gettid);}]])],
        [AC_MSG_RESULT([yes]);
         AC_DEFINE([HAVE_GETTID], [], [have gettid()])
         AC_DEFINE([HAVE_SYS_GETTID], [], [have syscall(SYS_gettid)])],
        [AC_MSG_RESULT([no])]
    )]
)

AC_CHECK_FUNCS(prctl mallinfo getpass closefrom getpwnam_r getgrnam_r getpwuid_r)
AC_CHECK_FUNCS(fmemopen funopen)

//AC_CHECK_HEADERS (header-file..., [action-if-found], [action-if-not-found], [includes])
AC_CHECK_HEADERS(sys/sockio.h glob.h net/if_tun.h linux/fib_rules.h)
AC_CHECK_HEADERS(net/pfkeyv2.h netipsec/ipsec.h netinet6/ipsec.h linux/udp.h)
AC_CHECK_HEADERS(netinet/ip6.h, [], [],
[
    #include <sys/types.h>
    #include <netinet/in.h>
])

// AC_CHECK_MEMBERS (members, [action-if-found], [action-if-not-found], [includes = ‘AC_INCLUDES_DEFAULT’])
AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [],
[
    #include <sys/types.h>
    #include <sys/socket.h>
])

AC_CHECK_MEMBERS([struct sadb_x_policy.sadb_x_policy_priority], [], [],
[
    #include <sys/types.h>
    #ifdef HAVE_NET_PFKEYV2_H
    #include <net/pfkeyv2.h>
    #else
    #include <stdint.h>
    #include <linux/pfkeyv2.h>
    #endif
])

//AC_COMPILE_IFELSE (input, [action-if-true], [action-if-false])
AC_MSG_CHECKING([for in6addr_any])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
        [[#include <sys/types.h>
          #include <sys/socket.h>
          #include <netinet/in.h>]],
        [[struct in6_addr in6;
          in6 = in6addr_any;]])],
    [AC_MSG_RESULT([yes]);
     AC_DEFINE([HAVE_IN6ADDR_ANY], [], [have struct in6_addr in6addr_any])],
    [AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for in6_pktinfo])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
        [[#define _GNU_SOURCE
          #include <sys/types.h>
          #include <sys/socket.h>
          #include <netinet/in.h>]],
        [[struct in6_pktinfo pi;
          if (pi.ipi6_ifindex)
          {
            return ;
          }]])],
    [AC_MSG_RESULT([yes]);
     AC_DEFINE([HAVE_IN6_PKTINFO], [], [have struct in6_pktinfo.ipi6_ifindex])],
    [AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for IPSEC_MODE_BEET])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
        [[#include <sys/types.h>
          #ifdef HAVE_NETIPSEC_IPSEC_H
          #include <netipsec/ipsec.h>
          #elif defined(HAVE_NETINET6_IPSEC_H)
          #include <netinet6/ipsec.h>
          #else
          #include <stdint.h>
          #include <linux/ipsec.h>
          #endif]],
        [[int mode = IPSEC_MODE_BEET;
          return mode;]])],
    [AC_MSG_RESULT([yes]);
     AC_DEFINE([HAVE_IPSEC_MODE_BEET], [], [have IPSEC_MODE_BEET defined])],
    [AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for IPSEC_DIR_FWD])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
        [[#include <sys/types.h>
          #ifdef HAVE_NETIPSEC_IPSEC_H
          #include <netipsec/ipsec.h>
          #elif defined(HAVE_NETINET6_IPSEC_H)
          #include <netinet6/ipsec.h>
          #else
          #include <stdint.h>
          #include <linux/ipsec.h>
          #endif]],
        [[int dir = IPSEC_DIR_FWD;
          return dir;]])],
    [AC_MSG_RESULT([yes]);
     AC_DEFINE([HAVE_IPSEC_DIR_FWD], [], [have IPSEC_DIR_FWD defined])],
    [AC_MSG_RESULT([no])]
)

AC_MSG_CHECKING([for RTA_TABLE])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM(
        [[#include <sys/socket.h>
          #include <linux/netlink.h>
          #include <linux/rtnetlink.h>]],
        [[int rta_type = RTA_TABLE;
          return rta_type;]])],
    [AC_MSG_RESULT([yes]);
     AC_DEFINE([HAVE_RTA_TABLE], [], [have netlink RTA_TABLE defined])],
    [AC_MSG_RESULT([no])]
)

//AC_RUN_IFELSE (input, [action-if-true], [action-if-false], [action-if-cross-compiling = ‘AC_MSG_FAILURE’])
//AC_LANG_SOURCE (source)
AC_MSG_CHECKING([for gcc atomic operations])
AC_RUN_IFELSE([AC_LANG_SOURCE(
    [[
            int main() {
            volatile int ref = ;
            __sync_fetch_and_add (&ref, );
            __sync_sub_and_fetch (&ref, );
            /* Make sure test fails if operations are not supported */
            __sync_val_compare_and_swap(&ref, , );
            return ref;
        }
    ]])],
    [AC_MSG_RESULT([yes]);
     AC_DEFINE([HAVE_GCC_ATOMIC_OPERATIONS], [],
           [have GCC __sync_* atomic operations])],
    [AC_MSG_RESULT([no])],
    [AC_MSG_RESULT([no])]
)

# check for the new register_printf_specifier function with len argument,
# or the deprecated register_printf_function without
AC_CHECK_FUNC(
    [register_printf_specifier],
    [AC_DEFINE([HAVE_PRINTF_SPECIFIER], [], [have register_printf_specifier()])],
    [AC_CHECK_FUNC(
        [register_printf_function],
        [AC_DEFINE([HAVE_PRINTF_FUNCTION], [], [have register_printf_function()])],
        [
            AC_MSG_NOTICE([printf does not support custom format specifiers!])
            builtin_printf=true
        ]
    )]
)

//AC_CHECK_LIB (library, function, [action-if-found], [action-if-not-found], [other-libraries])
//AC_DEFINE (variable, value, [description])
if test x$vstr = xtrue; then
    AC_CHECK_LIB([vstr],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([Vstr string library not found])],[])
    AC_DEFINE([USE_VSTR], [], [use vstring library for printf hooks])
    builtin_printf=false
fi

if test x$builtin_printf = xtrue; then
    AC_DEFINE([USE_BUILTIN_PRINTF], [], [using builtin printf for printf hooks])
fi

if test x$gmp = xtrue; then
    saved_LIBS=$LIBS
    AC_CHECK_LIB([gmp],[main],[],[AC_MSG_ERROR([GNU Multi Precision library gmp not found])],[])
    AC_MSG_CHECKING([mpz_powm_sec])
    if test x$mpz_powm_sec = xyes; then
        AC_COMPILE_IFELSE(
            [AC_LANG_PROGRAM(
                [[#include "gmp.h"]],
                [[void *x = mpz_powm_sec;]])],
            [AC_MSG_RESULT([yes]);
             AC_DEFINE([HAVE_MPZ_POWM_SEC], [], [have mpz_mown_sec()])],
            [AC_MSG_RESULT([no])]
        )
    else
        AC_MSG_RESULT([disabled])
    fi
    LIBS=$saved_LIBS
    AC_MSG_CHECKING([gmp.h version >= 4.1.])
    AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#include "gmp.h"]],
            [[
                #if (__GNU_MP_VERSION*100 +  __GNU_MP_VERSION_MINOR*10 + __GNU_MP_VERSION_PATCHLEVEL) < 414
                    #error bad gmp
                #endif]])],
        [AC_MSG_RESULT([yes])],
        [AC_MSG_RESULT([no]); AC_MSG_ERROR([No usable gmp.h found!])]
    )
fi

if test x$ldap = xtrue; then
    AC_CHECK_LIB([ldap],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([LDAP library ldap not found])],[])
    AC_CHECK_LIB([lber],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([LDAP library lber not found])],[])
    AC_CHECK_HEADER([ldap.h],,[AC_MSG_ERROR([LDAP header ldap.h not found!])])
fi

if test x$curl = xtrue; then
    AC_CHECK_LIB([curl],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([CURL library curl not found])],[])
    AC_CHECK_HEADER([curl/curl.h],,[AC_MSG_ERROR([CURL header curl/curl.h not found!])])
fi

//AC_HAVE_LIBRARY (library, [action-if-found], [action-if-not-found], [other-libraries])
if test x$unbound = xtrue; then
    AC_HAVE_LIBRARY([ldns],[LIBS="$LIBS"],[AC_MSG_ERROR([UNBOUND library ldns not found])])
    AC_CHECK_HEADER([ldns/ldns.h],,[AC_MSG_ERROR([UNBOUND header ldns/ldns.h not found!])])
    AC_HAVE_LIBRARY([unbound],[LIBS="$LIBS"],[AC_MSG_ERROR([UNBOUND library libunbound not found])])
    AC_CHECK_HEADER([unbound.h],,[AC_MSG_ERROR([UNBOUND header unbound.h not found!])])
fi

//PKG_CHECK_MODULES(prefix, list-of-modules, action-if-found, action-if-not-found)
if test x$soup = xtrue; then
    PKG_CHECK_MODULES(soup, [libsoup-2.4])
    AC_SUBST(soup_CFLAGS)
    AC_SUBST(soup_LIBS)
fi

if test x$xml = xtrue; then
    PKG_CHECK_MODULES(xml, [libxml-2.0])
    AC_SUBST(xml_CFLAGS)
    AC_SUBST(xml_LIBS)
fi

if test x$tss = xtrousers; then
    AC_CHECK_LIB([tspi],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([TrouSerS library libtspi not found])],[])
    AC_CHECK_HEADER([trousers/tss.h],,[AC_MSG_ERROR([TrouSerS header trousers/tss.h not found!])])
    AC_DEFINE([TSS_TROUSERS], [], [use TrouSerS library libtspi as TSS implementation])
fi

//AC_TRY_LINK_FUNC (function, [action-if-found], [action-if-not-found])
if test x$dumm = xtrue; then
    PKG_CHECK_MODULES(gtk, [gtk+-2.0 vte])
    AC_SUBST(gtk_CFLAGS)
    AC_SUBST(gtk_LIBS)
    AC_CHECK_PROGS(RUBY, ruby)
    AC_MSG_CHECKING([for Ruby header files])
    if test -n "$RUBY"; then
        RUBYINCLUDE=
        RUBYDIR=`($RUBY -r rbconfig -e 'print RbConfig::CONFIG[["rubyhdrdir"]] || ""') >/dev/null`
        if test -n "$RUBYDIR" -a -r "$RUBYDIR/ruby.h"; then
            RUBYARCH=`($RUBY -r rbconfig -e 'print RbConfig::CONFIG[["arch"]] || ""') >/dev/null`
            if test -n "$RUBYARCH"; then
                AC_MSG_RESULT([$RUBYDIR])
                RUBYINCLUDE="-I$RUBYDIR -I$RUBYDIR/$RUBYARCH"
            fi
        else
            RUBYDIR=`($RUBY -r rbconfig -e 'print RbConfig::CONFIG[["archdir"]] || ""') >/dev/null`
            if test -n "$RUBYDIR" -a -r "$RUBYDIR/ruby.h"; then
                AC_MSG_RESULT([$RUBYDIR])
                RUBYINCLUDE="-I$RUBYDIR"
            fi
        fi
        if test -z "$RUBYINCLUDE"; then
            AC_MSG_ERROR([ruby.h not found])
        fi
        AC_SUBST(RUBYINCLUDE)
    else
        AC_MSG_ERROR([don't know how to run ruby])
    fi
    AC_MSG_CHECKING([for libruby])
    saved_LIBS=$LIBS
    LIBS=`($RUBY -r rbconfig -e 'print RbConfig::CONFIG[["LIBRUBYARG_SHARED"]] || ""') >/dev/null`
    AC_TRY_LINK_FUNC(ruby_init,
        [AC_MSG_RESULT([$LIBS]); RUBYLIB=$LIBS],
        [AC_MSG_ERROR([not found])])
    AC_SUBST(RUBYLIB)
    AC_CHECK_FUNCS(rb_errinfo)
    LIBS=$saved_LIBS
fi

if test x$fast = xtrue; then
    AC_CHECK_LIB([neo_cgi],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([ClearSilver library neo_cgi not found!])],[])
    AC_CHECK_LIB([neo_utl],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([ClearSilver library neo_utl not found!])],[])
    AC_MSG_CHECKING([ClearSilver requires zlib])
    saved_CFLAGS=$CFLAGS
    saved_LIBS=$LIBS
    LIBS="-lneo_cgi -lneo_cs -lneo_utl"
    CFLAGS="-I/usr/include/ClearSilver"
    AC_LINK_IFELSE(
        [AC_LANG_PROGRAM(
            [[#include <ClearSilver.h>]],
            [[NEOERR *err = cgi_display(NULL, NULL);]])],
        [AC_MSG_RESULT([no]); clearsilver_LIBS="$LIBS"],
        [AC_MSG_RESULT([yes]); clearsilver_LIBS="$LIBS -lz"]
    )
    AC_SUBST(clearsilver_LIBS)
    LIBS=$saved_LIBS
    CFLAGS=$saved_CFLAGS
# autoconf does not like CamelCase!? How to fix this?
#    AC_CHECK_HEADER([ClearSilver/ClearSilver.h],,[AC_MSG_ERROR([ClearSilver header file ClearSilver/ClearSilver.h not found!])])

    AC_CHECK_LIB([fcgi],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([FastCGI library fcgi not found!])],[])
    AC_CHECK_HEADER([fcgiapp.h],,[AC_MSG_ERROR([FastCGI header file fcgiapp.h not found!])])
fi

//AC_PATH_PROG (variable, prog-to-check-for, [value-if-not-found], [path = ‘$PATH’])
if test x$mysql = xtrue; then
    AC_PATH_PROG([MYSQLCONFIG], [mysql_config], [], [$PATH:/bin:/usr/bin:/usr/local/bin])
    if test x$MYSQLCONFIG = x; then
        AC_MSG_ERROR([mysql_config not found!])
    fi
    AC_SUBST(MYSQLLIB, `$MYSQLCONFIG --libs_r`)
    AC_SUBST(MYSQLCFLAG, `$MYSQLCONFIG --cflags`)
fi

if test x$sqlite = xtrue; then
    AC_CHECK_LIB([sqlite3],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([SQLite library sqlite3 not found])],[])
    AC_CHECK_HEADER([sqlite3.h],,[AC_MSG_ERROR([SQLite header sqlite3.h not found!])])
    AC_MSG_CHECKING([sqlite3_prepare_v2])
    AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#include <sqlite3.h>]],
            [[void *test = sqlite3_prepare_v2;]])],
        [AC_MSG_RESULT([yes]);
         AC_DEFINE([HAVE_SQLITE3_PREPARE_V2], [], [have sqlite3_prepare_v2()])],
        [AC_MSG_RESULT([no])]
    )
    AC_MSG_CHECKING([sqlite3.h version >= 3.3.])
    AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#include <sqlite3.h>]],
            [[
                #if SQLITE_VERSION_NUMBER < 3003001
                    #error bad sqlite
                #endif]])],
        [AC_MSG_RESULT([yes])],
        [AC_MSG_RESULT([no]); AC_MSG_ERROR([SQLite version >= 3.3. required!])]
    )
fi

if test x$openssl = xtrue; then
    AC_CHECK_LIB([crypto],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([OpenSSL crypto library not found])],[])
    AC_CHECK_HEADER([openssl/evp.h],,[AC_MSG_ERROR([OpenSSL header openssl/evp.h not found!])])
fi

if test x$gcrypt = xtrue; then
    AC_CHECK_LIB([gcrypt],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([gcrypt library not found])],[-lgpg-error])
    AC_CHECK_HEADER([gcrypt.h],,[AC_MSG_ERROR([gcrypt header gcrypt.h not found!])])
    AC_MSG_CHECKING([gcrypt CAMELLIA cipher])
    AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#include <gcrypt.h>]],
            [[enum gcry_cipher_algos alg = GCRY_CIPHER_CAMELLIA128;]])],
        [AC_MSG_RESULT([yes]);
         AC_DEFINE([HAVE_GCRY_CIPHER_CAMELLIA], [], [have GCRY_CIPHER_CAMELLIA128])],
        [AC_MSG_RESULT([no])]
    )
fi

if test x$uci = xtrue; then
    AC_CHECK_LIB([uci],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([UCI library libuci not found])],[])
    AC_CHECK_HEADER([uci.h],,[AC_MSG_ERROR([UCI header uci.h not found!])])
fi

//android相关的库的检测
if test x$android_dns = xtrue; then
    AC_CHECK_LIB([cutils],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([Android library libcutils not found])],[])
    AC_CHECK_HEADER([cutils/properties.h],,[AC_MSG_ERROR([Android header cutils/properties.h not found!])])
    # we have to force the use of libdl here because the autodetection
    # above does not work correctly when cross-compiling for android.
    DLLIB="-ldl"
    AC_SUBST(DLLIB)
fi

if test x$maemo = xtrue; then
    PKG_CHECK_MODULES(maemo, [glib-2.0 gthread-2.0 libosso osso-af-settings])
    AC_SUBST(maemo_CFLAGS)
    AC_SUBST(maemo_LIBS)
    dbusservicedir="/usr/share/dbus-1/system-services"
    AC_SUBST(dbusservicedir)
fi

if test x$eap_sim_pcsc = xtrue; then
    PKG_CHECK_MODULES(pcsclite, [libpcsclite])
    AC_SUBST(pcsclite_CFLAGS)
    AC_SUBST(pcsclite_LIBS)
fi

if test x$nm = xtrue; then
    PKG_CHECK_EXISTS([libnm-glib],
        [PKG_CHECK_MODULES(nm, [NetworkManager gthread-2.0 libnm-util libnm-glib libnm-glib-vpn])],
        [PKG_CHECK_MODULES(nm, [NetworkManager gthread-2.0 libnm_util libnm_glib libnm_glib_vpn])]
    )
    AC_SUBST(nm_CFLAGS)
    AC_SUBST(nm_LIBS)
fi

if test x$xauth_pam = xtrue; then
    AC_CHECK_LIB([pam],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([PAM library not found])],[])
    AC_CHECK_HEADER([security/pam_appl.h],,[AC_MSG_ERROR([PAM header security/pam_appl.h not found!])])
fi

if test x$capabilities = xnative; then
    AC_MSG_NOTICE([Usage of the native Linux capabilities interface is deprecated, use libcap instead])
    # Linux requires the following for capset(), Android does not have it,
    # but defines capset() in unistd.h instead.
    AC_CHECK_HEADERS([sys/capability.h])
    AC_CHECK_FUNC(capset,,[AC_MSG_ERROR([capset() not found!])])
    AC_DEFINE([CAPABILITIES_NATIVE], [], [have native linux capset()])
fi

if test x$capabilities = xlibcap; then
    AC_CHECK_LIB([cap],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([libcap library not found])],[])
    AC_CHECK_HEADER([sys/capability.h],
        [AC_DEFINE([HAVE_SYS_CAPABILITY_H], [], [have sys/capability.h])],
        [AC_MSG_ERROR([libcap header sys/capability.h not found!])])
    AC_DEFINE([CAPABILITIES_LIBCAP], [], [have libpcap library])
fi

if test x$integrity_test = xtrue; then
    AC_MSG_CHECKING([for dladdr()])
    AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#define _GNU_SOURCE
              #include <dlfcn.h>]],
            [[Dl_info info; dladdr(main, &info);]])],
        [AC_MSG_RESULT([yes])],
        [AC_MSG_RESULT([no]);
         AC_MSG_ERROR([dladdr() not supported, required by integrity-test!])]
    )
    AC_MSG_CHECKING([for dl_iterate_phdr()])
    AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
            [[#define _GNU_SOURCE
              #include <link.h>]],
            [[dl_iterate_phdr((void*), (void*));]])],
        [AC_MSG_RESULT([yes])],
        [AC_MSG_RESULT([no]);
         AC_MSG_ERROR([dl_iterate_phdr() not supported, required by integrity-test!])]
    )
fi

if test x$bfd_backtraces = xtrue; then
    AC_CHECK_LIB([bfd],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([binutils libbfd not found!])],[])
    AC_CHECK_HEADER([bfd.h],[AC_DEFINE([HAVE_BFD_H],,[have binutils bfd.h])],
        [AC_MSG_ERROR([binutils bfd.h header not found!])])
    BFDLIB="-lbfd"
    AC_SUBST(BFDLIB)
fi

if test x$unwind_backtraces = xtrue; then
    AC_CHECK_LIB([unwind],[main],[LIBS="$LIBS"],[AC_MSG_ERROR([libunwind not found!])],[])
    AC_CHECK_HEADER([libunwind.h],[AC_DEFINE([HAVE_LIBUNWIND_H],,[have libunwind.h])],
        [AC_MSG_ERROR([libunwind.h header not found!])])
    UNWINDLIB="-lunwind"
    AC_SUBST(UNWINDLIB)
fi

//dev头文件
AM_CONDITIONAL(USE_DEV_HEADERS, [test "x$dev_headers" != xno])
if test x$dev_headers = xyes; then
    dev_headers="$includedir/strongswan"
fi
AC_SUBST(dev_headers)

CFLAGS="$CFLAGS -include `pwd`/config.h"

if test x$tkm = xtrue; then
    AC_PATH_PROG([GPRBUILD], [gprbuild], [], [$PATH:/bin:/usr/bin:/usr/local/bin])
fi

if test x$unit_tests = xtrue; then
    PKG_CHECK_MODULES(CHECK, [check >= 0.9.])
    AC_SUBST(CHECK_CFLAGS)
    AC_SUBST(CHECK_LIBS)
fi

if test x$coverage = xtrue; then
    AC_PATH_PROG([LCOV], [lcov], [], [$PATH:/bin:/usr/bin:/usr/local/bin])
    if test x$LCOV = x; then
        AC_MSG_ERROR([lcov not found])
    fi
    AC_PATH_PROG([GENHTML], [genhtml], [], [$PATH:/bin:/usr/bin:/usr/local/bin])
    if test x$GENHTML = x; then
        AC_MSG_ERROR([genhtml not found])
    fi

    COVERAGE_CFLAGS="-fprofile-arcs -ftest-coverage"
    COVERAGE_LDFLAGS="-fprofile-arcs"
    AC_SUBST(COVERAGE_CFLAGS)
    AC_SUBST(COVERAGE_LDFLAGS)

    AC_MSG_NOTICE([coverage enabled, adding "-g -O0" to CFLAGS])
    CFLAGS="${CFLAGS} -g -O0"
fi

# ===============================================
#  collect plugin list for strongSwan components
# ===============================================

m4_include(m4/macros/add-plugin.m4)

# plugin lists for all components
charon_plugins=
starter_plugins=
pool_plugins=
attest_plugins=
openac_plugins=
scepclient_plugins=
pki_plugins=
scripts_plugins=
manager_plugins=
medsrv_plugins=
nm_plugins=
cmd_plugins=

# location specific lists for checksumming,
# for src/libcharon, src/libhydra, src/libstrongswan and src/libtnccs
c_plugins=
h_plugins=
s_plugins=
t_plugins=

ADD_PLUGIN([test-vectors],         [s charon openac scepclient pki])
ADD_PLUGIN([curl],                 [s charon scepclient scripts nm cmd])
ADD_PLUGIN([soup],                 [s charon scripts nm cmd])
ADD_PLUGIN([unbound],              [s charon scripts])
ADD_PLUGIN([ldap],                 [s charon scepclient scripts nm cmd])
ADD_PLUGIN([mysql],                [s charon pool manager medsrv attest])
ADD_PLUGIN([sqlite],               [s charon pool manager medsrv attest])
ADD_PLUGIN([pkcs11],               [s charon pki nm cmd])
ADD_PLUGIN([aes],                  [s charon openac scepclient pki scripts nm cmd])
ADD_PLUGIN([des],                  [s charon openac scepclient pki scripts nm cmd])
ADD_PLUGIN([blowfish],             [s charon openac scepclient pki scripts nm cmd])
ADD_PLUGIN([rc2],                  [s charon openac scepclient pki scripts nm cmd])
ADD_PLUGIN([sha1],                 [s charon openac scepclient pki scripts medsrv attest nm cmd])
ADD_PLUGIN([sha2],                 [s charon openac scepclient pki scripts medsrv attest nm cmd])
ADD_PLUGIN([md4],                  [s charon openac manager scepclient pki nm cmd])
ADD_PLUGIN([md5],                  [s charon openac scepclient pki scripts attest nm cmd])
ADD_PLUGIN([rdrand],               [s charon openac scepclient pki scripts medsrv attest nm cmd])
ADD_PLUGIN([random],               [s charon openac scepclient pki scripts medsrv attest nm cmd])
ADD_PLUGIN([nonce],                [s charon nm cmd])
ADD_PLUGIN([x509],                 [s charon openac scepclient pki scripts attest nm cmd])
ADD_PLUGIN([revocation],           [s charon nm cmd])
ADD_PLUGIN([constraints],          [s charon nm cmd])
ADD_PLUGIN([pubkey],               [s charon cmd])
ADD_PLUGIN([pkcs1],                [s charon openac scepclient pki scripts manager medsrv attest nm cmd])
ADD_PLUGIN([pkcs7],                [s charon scepclient pki scripts nm cmd])
ADD_PLUGIN([pkcs8],                [s charon openac scepclient pki scripts manager medsrv attest nm cmd])
ADD_PLUGIN([pkcs12],               [s charon scepclient pki scripts cmd])
ADD_PLUGIN([pgp],                  [s charon])
ADD_PLUGIN([dnskey],               [s charon pki])
ADD_PLUGIN([sshkey],               [s charon pki nm cmd])
ADD_PLUGIN([dnscert],              [c charon])
ADD_PLUGIN([ipseckey],             [c charon])
ADD_PLUGIN([pem],                  [s charon openac scepclient pki scripts manager medsrv attest nm cmd])
ADD_PLUGIN([padlock],              [s charon])
ADD_PLUGIN([openssl],              [s charon openac scepclient pki scripts manager medsrv attest nm cmd])
ADD_PLUGIN([gcrypt],               [s charon openac scepclient pki scripts manager medsrv attest nm cmd])
ADD_PLUGIN([af-alg],               [s charon openac scepclient pki scripts medsrv attest nm cmd])
ADD_PLUGIN([fips-prf],             [s charon nm cmd])
ADD_PLUGIN([gmp],                  [s charon openac scepclient pki scripts manager medsrv attest nm cmd])
ADD_PLUGIN([agent],                [s charon nm cmd])
ADD_PLUGIN([keychain],             [s charon cmd])
ADD_PLUGIN([xcbc],                 [s charon nm cmd])
ADD_PLUGIN([cmac],                 [s charon nm cmd])
ADD_PLUGIN([hmac],                 [s charon scripts nm cmd])
ADD_PLUGIN([ctr],                  [s charon scripts nm cmd])
ADD_PLUGIN([ccm],                  [s charon scripts nm cmd])
ADD_PLUGIN([gcm],                  [s charon scripts nm cmd])
ADD_PLUGIN([attr],                 [h charon])
ADD_PLUGIN([attr-sql],             [h charon])
ADD_PLUGIN([load-tester],          [c charon])
ADD_PLUGIN([kernel-libipsec],      [c charon cmd])
ADD_PLUGIN([kernel-pfkey],         [h charon starter nm cmd])
ADD_PLUGIN([kernel-pfroute],       [h charon starter nm cmd])
ADD_PLUGIN([kernel-klips],         [h charon starter])
ADD_PLUGIN([kernel-netlink],       [h charon starter nm cmd])
ADD_PLUGIN([resolve],              [h charon cmd])
ADD_PLUGIN([socket-default],       [c charon nm cmd])
ADD_PLUGIN([socket-dynamic],       [c charon cmd])
ADD_PLUGIN([farp],                 [c charon])
ADD_PLUGIN([stroke],               [c charon])
ADD_PLUGIN([smp],                  [c charon])
ADD_PLUGIN([sql],                  [c charon])
ADD_PLUGIN([updown],               [c charon])
ADD_PLUGIN([eap-identity],         [c charon nm cmd])
ADD_PLUGIN([eap-sim],              [c charon])
ADD_PLUGIN([eap-sim-file],         [c charon])
ADD_PLUGIN([eap-sim-pcsc],         [c charon])
ADD_PLUGIN([eap-aka],              [c charon])
ADD_PLUGIN([eap-aka-3gpp2],        [c charon])
ADD_PLUGIN([eap-simaka-sql],       [c charon])
ADD_PLUGIN([eap-simaka-pseudonym], [c charon])
ADD_PLUGIN([eap-simaka-reauth],    [c charon])
ADD_PLUGIN([eap-md5],              [c charon nm cmd])
ADD_PLUGIN([eap-gtc],              [c charon nm cmd])
ADD_PLUGIN([eap-mschapv2],         [c charon nm cmd])
ADD_PLUGIN([eap-dynamic],          [c charon])
ADD_PLUGIN([eap-radius],           [c charon])
ADD_PLUGIN([eap-tls],              [c charon nm cmd])
ADD_PLUGIN([eap-ttls],             [c charon nm cmd])
ADD_PLUGIN([eap-peap],             [c charon nm cmd])
ADD_PLUGIN([eap-tnc],              [c charon])
ADD_PLUGIN([xauth-generic],        [c charon cmd])
ADD_PLUGIN([xauth-eap],            [c charon])
ADD_PLUGIN([xauth-pam],            [c charon])
ADD_PLUGIN([xauth-noauth],         [c charon])
ADD_PLUGIN([tnc-ifmap],            [c charon])
ADD_PLUGIN([tnc-pdp],              [c charon])
ADD_PLUGIN([tnc-imc],              [t charon])
ADD_PLUGIN([tnc-imv],              [t charon])
ADD_PLUGIN([tnc-tnccs],            [t charon])
ADD_PLUGIN([tnccs-],             [t charon])
ADD_PLUGIN([tnccs-],             [t charon])
ADD_PLUGIN([tnccs-dynamic],        [t charon])
ADD_PLUGIN([medsrv],               [c charon])
ADD_PLUGIN([medcli],               [c charon])
ADD_PLUGIN([dhcp],                 [c charon])
ADD_PLUGIN([osx-attr],             [c charon cmd])
ADD_PLUGIN([android-dns],          [c charon])
ADD_PLUGIN([android-log],          [c charon])
ADD_PLUGIN([ha],                   [c charon])
ADD_PLUGIN([whitelist],            [c charon])
ADD_PLUGIN([lookip],               [c charon])
ADD_PLUGIN([error-notify],         [c charon])
ADD_PLUGIN([certexpire],           [c charon])
ADD_PLUGIN([systime-fix],          [c charon])
ADD_PLUGIN([led],                  [c charon])
ADD_PLUGIN([duplicheck],           [c charon])
ADD_PLUGIN([coupling],             [c charon])
ADD_PLUGIN([radattr],              [c charon])
ADD_PLUGIN([maemo],                [c charon])
ADD_PLUGIN([uci],                  [c charon])
ADD_PLUGIN([addrblock],            [c charon])
ADD_PLUGIN([unity],                [c charon])
ADD_PLUGIN([unit-tester],          [c charon])

AC_SUBST(charon_plugins)
AC_SUBST(starter_plugins)
AC_SUBST(pool_plugins)
AC_SUBST(attest_plugins)
AC_SUBST(openac_plugins)
AC_SUBST(scepclient_plugins)
AC_SUBST(pki_plugins)
AC_SUBST(scripts_plugins)
AC_SUBST(manager_plugins)
AC_SUBST(medsrv_plugins)
AC_SUBST(nm_plugins)
AC_SUBST(cmd_plugins)

AC_SUBST(c_plugins)
AC_SUBST(h_plugins)
AC_SUBST(s_plugins)
AC_SUBST(t_plugins)

# ======================
#  set Makefile.am vars
# ======================

#  libstrongswan plugins
# -----------------------
//AM_CONDITIONAL (conditional, condition)
AM_CONDITIONAL(USE_TEST_VECTORS, test x$test_vectors = xtrue)
AM_CONDITIONAL(USE_CURL, test x$curl = xtrue)
AM_CONDITIONAL(USE_UNBOUND, test x$unbound = xtrue)
AM_CONDITIONAL(USE_SOUP, test x$soup = xtrue)
AM_CONDITIONAL(USE_LDAP, test x$ldap = xtrue)
AM_CONDITIONAL(USE_AES, test x$aes = xtrue)
AM_CONDITIONAL(USE_DES, test x$des = xtrue)
AM_CONDITIONAL(USE_BLOWFISH, test x$blowfish = xtrue)
AM_CONDITIONAL(USE_RC2, test x$rc2 = xtrue)
AM_CONDITIONAL(USE_MD4, test x$md4 = xtrue)
AM_CONDITIONAL(USE_MD5, test x$md5 = xtrue)
AM_CONDITIONAL(USE_SHA1, test x$sha1 = xtrue)
AM_CONDITIONAL(USE_SHA2, test x$sha2 = xtrue)
AM_CONDITIONAL(USE_FIPS_PRF, test x$fips_prf = xtrue)
AM_CONDITIONAL(USE_GMP, test x$gmp = xtrue)
AM_CONDITIONAL(USE_RDRAND, test x$rdrand = xtrue)
AM_CONDITIONAL(USE_RANDOM, test x$random = xtrue)
AM_CONDITIONAL(USE_NONCE, test x$nonce = xtrue)
AM_CONDITIONAL(USE_X509, test x$x509 = xtrue)
AM_CONDITIONAL(USE_REVOCATION, test x$revocation = xtrue)
AM_CONDITIONAL(USE_CONSTRAINTS, test x$constraints = xtrue)
AM_CONDITIONAL(USE_PUBKEY, test x$pubkey = xtrue)
AM_CONDITIONAL(USE_PKCS1, test x$pkcs1 = xtrue)
AM_CONDITIONAL(USE_PKCS7, test x$pkcs7 = xtrue)
AM_CONDITIONAL(USE_PKCS8, test x$pkcs8 = xtrue)
AM_CONDITIONAL(USE_PKCS12, test x$pkcs12 = xtrue)
AM_CONDITIONAL(USE_PGP, test x$pgp = xtrue)
AM_CONDITIONAL(USE_DNSKEY, test x$dnskey = xtrue)
AM_CONDITIONAL(USE_SSHKEY, test x$sshkey = xtrue)
AM_CONDITIONAL(USE_PEM, test x$pem = xtrue)
AM_CONDITIONAL(USE_HMAC, test x$hmac = xtrue)
AM_CONDITIONAL(USE_CMAC, test x$cmac = xtrue)
AM_CONDITIONAL(USE_XCBC, test x$xcbc = xtrue)
AM_CONDITIONAL(USE_MYSQL, test x$mysql = xtrue)
AM_CONDITIONAL(USE_SQLITE, test x$sqlite = xtrue)
AM_CONDITIONAL(USE_PADLOCK, test x$padlock = xtrue)
AM_CONDITIONAL(USE_OPENSSL, test x$openssl = xtrue)
AM_CONDITIONAL(USE_GCRYPT, test x$gcrypt = xtrue)
AM_CONDITIONAL(USE_AGENT, test x$agent = xtrue)
AM_CONDITIONAL(USE_KEYCHAIN, test x$keychain = xtrue)
AM_CONDITIONAL(USE_PKCS11, test x$pkcs11 = xtrue)
AM_CONDITIONAL(USE_CTR, test x$ctr = xtrue)
AM_CONDITIONAL(USE_CCM, test x$ccm = xtrue)
AM_CONDITIONAL(USE_GCM, test x$gcm = xtrue)
AM_CONDITIONAL(USE_AF_ALG, test x$af_alg = xtrue)

#  charon plugins
# ----------------
AM_CONDITIONAL(USE_STROKE, test x$stroke = xtrue)
AM_CONDITIONAL(USE_MEDSRV, test x$medsrv = xtrue)
AM_CONDITIONAL(USE_MEDCLI, test x$medcli = xtrue)
AM_CONDITIONAL(USE_UCI, test x$uci = xtrue)
AM_CONDITIONAL(USE_OSX_ATTR, test x$osx_attr = xtrue)
AM_CONDITIONAL(USE_ANDROID_DNS, test x$android_dns = xtrue)
AM_CONDITIONAL(USE_ANDROID_LOG, test x$android_log = xtrue)
AM_CONDITIONAL(USE_MAEMO, test x$maemo = xtrue)
AM_CONDITIONAL(USE_SMP, test x$smp = xtrue)
AM_CONDITIONAL(USE_SQL, test x$sql = xtrue)
AM_CONDITIONAL(USE_DNSCERT, test x$dnscert = xtrue)
AM_CONDITIONAL(USE_IPSECKEY, test x$ipseckey = xtrue)
AM_CONDITIONAL(USE_UPDOWN, test x$updown = xtrue)
AM_CONDITIONAL(USE_DHCP, test x$dhcp = xtrue)
AM_CONDITIONAL(USE_UNIT_TESTS, test x$unit_tester = xtrue)
AM_CONDITIONAL(USE_LOAD_TESTER, test x$load_tester = xtrue)
AM_CONDITIONAL(USE_HA, test x$ha = xtrue)
AM_CONDITIONAL(USE_KERNEL_LIBIPSEC, test x$kernel_libipsec = xtrue)
AM_CONDITIONAL(USE_WHITELIST, test x$whitelist = xtrue)
AM_CONDITIONAL(USE_LOOKIP, test x$lookip = xtrue)
AM_CONDITIONAL(USE_ERROR_NOTIFY, test x$error_notify = xtrue)
AM_CONDITIONAL(USE_CERTEXPIRE, test x$certexpire = xtrue)
AM_CONDITIONAL(USE_SYSTIME_FIX, test x$systime_fix = xtrue)
AM_CONDITIONAL(USE_LED, test x$led = xtrue)
AM_CONDITIONAL(USE_DUPLICHECK, test x$duplicheck = xtrue)
AM_CONDITIONAL(USE_COUPLING, test x$coupling = xtrue)
AM_CONDITIONAL(USE_RADATTR, test x$radattr = xtrue)
AM_CONDITIONAL(USE_EAP_SIM, test x$eap_sim = xtrue)
AM_CONDITIONAL(USE_EAP_SIM_FILE, test x$eap_sim_file = xtrue)
AM_CONDITIONAL(USE_EAP_SIM_PCSC, test x$eap_sim_pcsc = xtrue)
AM_CONDITIONAL(USE_EAP_SIMAKA_SQL, test x$eap_simaka_sql = xtrue)
AM_CONDITIONAL(USE_EAP_SIMAKA_PSEUDONYM, test x$eap_simaka_pseudonym = xtrue)
AM_CONDITIONAL(USE_EAP_SIMAKA_REAUTH, test x$eap_simaka_reauth = xtrue)
AM_CONDITIONAL(USE_EAP_IDENTITY, test x$eap_identity = xtrue)
AM_CONDITIONAL(USE_EAP_MD5, test x$eap_md5 = xtrue)
AM_CONDITIONAL(USE_EAP_GTC, test x$eap_gtc = xtrue)
AM_CONDITIONAL(USE_EAP_AKA, test x$eap_aka = xtrue)
AM_CONDITIONAL(USE_EAP_AKA_3GPP2, test x$eap_aka_3gpp2 = xtrue)
AM_CONDITIONAL(USE_EAP_MSCHAPV2, test x$eap_mschapv2 = xtrue)
AM_CONDITIONAL(USE_EAP_TLS, test x$eap_tls = xtrue)
AM_CONDITIONAL(USE_EAP_TTLS, test x$eap_ttls = xtrue)
AM_CONDITIONAL(USE_EAP_PEAP, test x$eap_peap = xtrue)
AM_CONDITIONAL(USE_EAP_TNC, test x$eap_tnc = xtrue)
AM_CONDITIONAL(USE_EAP_DYNAMIC, test x$eap_dynamic = xtrue)
AM_CONDITIONAL(USE_EAP_RADIUS, test x$eap_radius = xtrue)
AM_CONDITIONAL(USE_XAUTH_GENERIC, test x$xauth_generic = xtrue)
AM_CONDITIONAL(USE_XAUTH_EAP, test x$xauth_eap = xtrue)
AM_CONDITIONAL(USE_XAUTH_PAM, test x$xauth_pam = xtrue)
AM_CONDITIONAL(USE_XAUTH_NOAUTH, test x$xauth_noauth = xtrue)
AM_CONDITIONAL(USE_TNC_IFMAP, test x$tnc_ifmap = xtrue)
AM_CONDITIONAL(USE_TNC_PDP, test x$tnc_pdp = xtrue)
AM_CONDITIONAL(USE_TNC_IMC, test x$tnc_imc = xtrue)
AM_CONDITIONAL(USE_TNC_IMV, test x$tnc_imv = xtrue)
AM_CONDITIONAL(USE_TNC_TNCCS, test x$tnc_tnccs = xtrue)
AM_CONDITIONAL(USE_TNCCS_11, test x$tnccs_11 = xtrue)
AM_CONDITIONAL(USE_TNCCS_20, test x$tnccs_20 = xtrue)
AM_CONDITIONAL(USE_TNCCS_DYNAMIC, test x$tnccs_dynamic = xtrue)
AM_CONDITIONAL(USE_IMC_TEST, test x$imc_test = xtrue)
AM_CONDITIONAL(USE_IMV_TEST, test x$imv_test = xtrue)
AM_CONDITIONAL(USE_IMC_SCANNER, test x$imc_scanner = xtrue)
AM_CONDITIONAL(USE_IMV_SCANNER, test x$imv_scanner = xtrue)
AM_CONDITIONAL(USE_IMC_OS, test x$imc_os = xtrue)
AM_CONDITIONAL(USE_IMV_OS, test x$imv_os = xtrue)
AM_CONDITIONAL(USE_IMC_ATTESTATION, test x$imc_attestation = xtrue)
AM_CONDITIONAL(USE_IMV_ATTESTATION, test x$imv_attestation = xtrue)
AM_CONDITIONAL(USE_IMC_SWID, test x$imc_swid = xtrue)
AM_CONDITIONAL(USE_IMV_SWID, test x$imv_swid = xtrue)
AM_CONDITIONAL(USE_SOCKET_DEFAULT, test x$socket_default = xtrue)
AM_CONDITIONAL(USE_SOCKET_DYNAMIC, test x$socket_dynamic = xtrue)
AM_CONDITIONAL(USE_FARP, test x$farp = xtrue)
AM_CONDITIONAL(USE_ADDRBLOCK, test x$addrblock = xtrue)
AM_CONDITIONAL(USE_UNITY, test x$unity = xtrue)

#  hydra plugins
# ---------------
AM_CONDITIONAL(USE_ATTR, test x$attr = xtrue)
AM_CONDITIONAL(USE_ATTR_SQL, test x$attr_sql = xtrue)
AM_CONDITIONAL(USE_KERNEL_KLIPS, test x$kernel_klips = xtrue)
AM_CONDITIONAL(USE_KERNEL_NETLINK, test x$kernel_netlink = xtrue)
AM_CONDITIONAL(USE_KERNEL_PFKEY, test x$kernel_pfkey = xtrue)
AM_CONDITIONAL(USE_KERNEL_PFROUTE, test x$kernel_pfroute = xtrue)
AM_CONDITIONAL(USE_RESOLVE, test x$resolve = xtrue)

#  other options
# ---------------
AM_CONDITIONAL(USE_LEAK_DETECTIVE, test x$leak_detective = xtrue)
AM_CONDITIONAL(USE_LOCK_PROFILER, test x$lock_profiler = xtrue)
AM_CONDITIONAL(USE_DUMM, test x$dumm = xtrue)
AM_CONDITIONAL(USE_FAST, test x$fast = xtrue)
AM_CONDITIONAL(USE_MANAGER, test x$manager = xtrue)
AM_CONDITIONAL(USE_ME, test x$mediation = xtrue)
AM_CONDITIONAL(USE_INTEGRITY_TEST, test x$integrity_test = xtrue)
AM_CONDITIONAL(USE_LOAD_WARNING, test x$load_warning = xtrue)
AM_CONDITIONAL(USE_IKEV1, test x$ikev1 = xtrue)
AM_CONDITIONAL(USE_IKEV2, test x$ikev2 = xtrue)
AM_CONDITIONAL(USE_THREADS, test x$threads = xtrue)
AM_CONDITIONAL(USE_ADNS, test x$adns = xtrue)
AM_CONDITIONAL(USE_CHARON, test x$charon = xtrue)
AM_CONDITIONAL(USE_NM, test x$nm = xtrue)
AM_CONDITIONAL(USE_TOOLS, test x$tools = xtrue)
AM_CONDITIONAL(USE_SCRIPTS, test x$scripts = xtrue)
AM_CONDITIONAL(USE_CONFTEST, test x$conftest = xtrue)
AM_CONDITIONAL(USE_LIBSTRONGSWAN, test x$charon = xtrue -o x$tools = xtrue -o x$conftest = xtrue -o x$fast = xtrue -o x$imcv = xtrue -o x$nm = xtrue -o x$tkm = xtrue -o x$cmd = xtrue -o x$tls = xtrue -o x$tnc_tnccs = xtrue)
AM_CONDITIONAL(USE_LIBHYDRA, test x$charon = xtrue -o x$nm = xtrue -o x$tkm = xtrue -o x$cmd = xtrue)
AM_CONDITIONAL(USE_LIBCHARON, test x$charon = xtrue -o x$conftest = xtrue -o x$nm = xtrue -o x$tkm = xtrue -o x$cmd = xtrue)
AM_CONDITIONAL(USE_LIBIPSEC, test x$libipsec = xtrue)
AM_CONDITIONAL(USE_LIBTNCIF, test x$tnc_tnccs = xtrue -o x$imcv = xtrue)
AM_CONDITIONAL(USE_LIBTNCCS, test x$tnc_tnccs = xtrue)
AM_CONDITIONAL(USE_LIBPTTLS, test x$tnc_tnccs = xtrue)
AM_CONDITIONAL(USE_FILE_CONFIG, test x$stroke = xtrue)
AM_CONDITIONAL(USE_IPSEC_SCRIPT, test x$stroke = xtrue -o x$tools = xtrue -o x$conftest = xtrue)
AM_CONDITIONAL(USE_LIBCAP, test x$capabilities = xlibcap)
AM_CONDITIONAL(USE_VSTR, test x$vstr = xtrue)
AM_CONDITIONAL(USE_BUILTIN_PRINTF, test x$builtin_printf = xtrue)
AM_CONDITIONAL(USE_SIMAKA, test x$simaka = xtrue)
AM_CONDITIONAL(USE_TLS, test x$tls = xtrue)
AM_CONDITIONAL(USE_RADIUS, test x$radius = xtrue)
AM_CONDITIONAL(USE_IMCV, test x$imcv = xtrue)
AM_CONDITIONAL(USE_PTS, test x$pts = xtrue)
AM_CONDITIONAL(USE_TROUSERS, test x$tss = xtrousers)
AM_CONDITIONAL(MONOLITHIC, test x$monolithic = xtrue)
AM_CONDITIONAL(USE_SILENT_RULES, test x$enable_silent_rules = xyes)
AM_CONDITIONAL(UNITTESTS, test x$unit_tests = xtrue)
AM_CONDITIONAL(COVERAGE, test x$coverage = xtrue)
AM_CONDITIONAL(USE_TKM, test x$tkm = xtrue)
AM_CONDITIONAL(USE_CMD, test x$cmd = xtrue)

# ========================
#  set global definitions
# ========================
//全局定义
if test x$mediation = xtrue; then
    AC_DEFINE([ME], [], [mediation extension support])
fi
if test x$capabilities = xlibcap -o x$capabilities = xnative; then
    AC_DEFINE([CAPABILITIES], [], [capability dropping support])
fi
if test x$monolithic = xtrue; then
    AC_DEFINE([MONOLITHIC], [], [monolithic build embedding plugins])
fi
if test x$ikev1 = xtrue; then
    AC_DEFINE([USE_IKEV1], [], [support for IKEv1 protocol])
fi
if test x$ikev2 = xtrue; then
    AC_DEFINE([USE_IKEV2], [], [support for IKEv2 protocol])
fi

# =================
#  build Makefiles
# =================
//输出Makefile
AC_CONFIG_FILES([
    Makefile
    man/Makefile
    init/Makefile
    init/systemd/Makefile
    src/Makefile
    src/include/Makefile
    src/libstrongswan/Makefile
    src/libstrongswan/plugins/aes/Makefile
    src/libstrongswan/plugins/cmac/Makefile
    src/libstrongswan/plugins/des/Makefile
    src/libstrongswan/plugins/blowfish/Makefile
    src/libstrongswan/plugins/rc2/Makefile
    src/libstrongswan/plugins/md4/Makefile
    src/libstrongswan/plugins/md5/Makefile
    src/libstrongswan/plugins/sha1/Makefile
    src/libstrongswan/plugins/sha2/Makefile
    src/libstrongswan/plugins/fips_prf/Makefile
    src/libstrongswan/plugins/gmp/Makefile
    src/libstrongswan/plugins/rdrand/Makefile
    src/libstrongswan/plugins/random/Makefile
    src/libstrongswan/plugins/nonce/Makefile
    src/libstrongswan/plugins/hmac/Makefile
    src/libstrongswan/plugins/xcbc/Makefile
    src/libstrongswan/plugins/x509/Makefile
    src/libstrongswan/plugins/revocation/Makefile
    src/libstrongswan/plugins/constraints/Makefile
    src/libstrongswan/plugins/pubkey/Makefile
    src/libstrongswan/plugins/pkcs1/Makefile
    src/libstrongswan/plugins/pkcs7/Makefile
    src/libstrongswan/plugins/pkcs8/Makefile
    src/libstrongswan/plugins/pkcs12/Makefile
    src/libstrongswan/plugins/pgp/Makefile
    src/libstrongswan/plugins/dnskey/Makefile
    src/libstrongswan/plugins/sshkey/Makefile
    src/libstrongswan/plugins/pem/Makefile
    src/libstrongswan/plugins/curl/Makefile
    src/libstrongswan/plugins/unbound/Makefile
    src/libstrongswan/plugins/soup/Makefile
    src/libstrongswan/plugins/ldap/Makefile
    src/libstrongswan/plugins/mysql/Makefile
    src/libstrongswan/plugins/sqlite/Makefile
    src/libstrongswan/plugins/padlock/Makefile
    src/libstrongswan/plugins/openssl/Makefile
    src/libstrongswan/plugins/gcrypt/Makefile
    src/libstrongswan/plugins/agent/Makefile
    src/libstrongswan/plugins/keychain/Makefile
    src/libstrongswan/plugins/pkcs11/Makefile
    src/libstrongswan/plugins/ctr/Makefile
    src/libstrongswan/plugins/ccm/Makefile
    src/libstrongswan/plugins/gcm/Makefile
    src/libstrongswan/plugins/af_alg/Makefile
    src/libstrongswan/plugins/test_vectors/Makefile
    src/libstrongswan/tests/Makefile
    src/libhydra/Makefile
    src/libhydra/plugins/attr/Makefile
    src/libhydra/plugins/attr_sql/Makefile
    src/libhydra/plugins/kernel_klips/Makefile
    src/libhydra/plugins/kernel_netlink/Makefile
    src/libhydra/plugins/kernel_pfkey/Makefile
    src/libhydra/plugins/kernel_pfroute/Makefile
    src/libhydra/plugins/resolve/Makefile
    src/libipsec/Makefile
    src/libsimaka/Makefile
    src/libtls/Makefile
    src/libradius/Makefile
    src/libtncif/Makefile
    src/libtnccs/Makefile
    src/libtnccs/plugins/tnc_tnccs/Makefile
    src/libtnccs/plugins/tnc_imc/Makefile
    src/libtnccs/plugins/tnc_imv/Makefile
    src/libtnccs/plugins/tnccs_11/Makefile
    src/libtnccs/plugins/tnccs_20/Makefile
    src/libtnccs/plugins/tnccs_dynamic/Makefile
    src/libpttls/Makefile
    src/libpts/Makefile
    src/libpts/plugins/imc_attestation/Makefile
    src/libpts/plugins/imv_attestation/Makefile
    src/libpts/plugins/imc_swid/Makefile
    src/libpts/plugins/imv_swid/Makefile
    src/libimcv/Makefile
    src/libimcv/plugins/imc_test/Makefile
    src/libimcv/plugins/imv_test/Makefile
    src/libimcv/plugins/imc_scanner/Makefile
    src/libimcv/plugins/imv_scanner/Makefile
    src/libimcv/plugins/imc_os/Makefile
    src/libimcv/plugins/imv_os/Makefile
    src/charon/Makefile
    src/charon-nm/Makefile
    src/charon-tkm/Makefile
    src/charon-cmd/Makefile
    src/libcharon/Makefile
    src/libcharon/plugins/eap_aka/Makefile
    src/libcharon/plugins/eap_aka_3gpp2/Makefile
    src/libcharon/plugins/eap_dynamic/Makefile
    src/libcharon/plugins/eap_identity/Makefile
    src/libcharon/plugins/eap_md5/Makefile
    src/libcharon/plugins/eap_gtc/Makefile
    src/libcharon/plugins/eap_sim/Makefile
    src/libcharon/plugins/eap_sim_file/Makefile
    src/libcharon/plugins/eap_sim_pcsc/Makefile
    src/libcharon/plugins/eap_simaka_sql/Makefile
    src/libcharon/plugins/eap_simaka_pseudonym/Makefile
    src/libcharon/plugins/eap_simaka_reauth/Makefile
    src/libcharon/plugins/eap_mschapv2/Makefile
    src/libcharon/plugins/eap_tls/Makefile
    src/libcharon/plugins/eap_ttls/Makefile
    src/libcharon/plugins/eap_peap/Makefile
    src/libcharon/plugins/eap_tnc/Makefile
    src/libcharon/plugins/eap_radius/Makefile
    src/libcharon/plugins/xauth_generic/Makefile
    src/libcharon/plugins/xauth_eap/Makefile
    src/libcharon/plugins/xauth_pam/Makefile
    src/libcharon/plugins/xauth_noauth/Makefile
    src/libcharon/plugins/tnc_ifmap/Makefile
    src/libcharon/plugins/tnc_pdp/Makefile
    src/libcharon/plugins/socket_default/Makefile
    src/libcharon/plugins/socket_dynamic/Makefile
    src/libcharon/plugins/farp/Makefile
    src/libcharon/plugins/smp/Makefile
    src/libcharon/plugins/sql/Makefile
    src/libcharon/plugins/dnscert/Makefile
    src/libcharon/plugins/ipseckey/Makefile
    src/libcharon/plugins/medsrv/Makefile
    src/libcharon/plugins/medcli/Makefile
    src/libcharon/plugins/addrblock/Makefile
    src/libcharon/plugins/unity/Makefile
    src/libcharon/plugins/uci/Makefile
    src/libcharon/plugins/ha/Makefile
    src/libcharon/plugins/kernel_libipsec/Makefile
    src/libcharon/plugins/whitelist/Makefile
    src/libcharon/plugins/lookip/Makefile
    src/libcharon/plugins/error_notify/Makefile
    src/libcharon/plugins/certexpire/Makefile
    src/libcharon/plugins/systime_fix/Makefile
    src/libcharon/plugins/led/Makefile
    src/libcharon/plugins/duplicheck/Makefile
    src/libcharon/plugins/coupling/Makefile
    src/libcharon/plugins/radattr/Makefile
    src/libcharon/plugins/osx_attr/Makefile
    src/libcharon/plugins/android_dns/Makefile
    src/libcharon/plugins/android_log/Makefile
    src/libcharon/plugins/maemo/Makefile
    src/libcharon/plugins/stroke/Makefile
    src/libcharon/plugins/updown/Makefile
    src/libcharon/plugins/dhcp/Makefile
    src/libcharon/plugins/unit_tester/Makefile
    src/libcharon/plugins/load_tester/Makefile
    src/stroke/Makefile
    src/ipsec/Makefile
    src/starter/Makefile
    src/_updown/Makefile
    src/_updown_espmark/Makefile
    src/_copyright/Makefile
    src/openac/Makefile
    src/scepclient/Makefile
    src/pki/Makefile
    src/pki/man/Makefile
    src/pool/Makefile
    src/dumm/Makefile
    src/dumm/ext/extconf.rb
    src/libfast/Makefile
    src/manager/Makefile
    src/medsrv/Makefile
    src/checksum/Makefile
    src/conftest/Makefile
    src/pt-tls-client/Makefile
    scripts/Makefile
    testing/Makefile
])

# =================
#  build man pages
# =================

//输出帮助文档
AC_CONFIG_FILES([
    man/ipsec.conf.
    man/ipsec.secrets.
    man/strongswan.conf.
    src/charon-cmd/charon-cmd.
    src/pki/man/pki.
    src/pki/man/pki---gen.
    src/pki/man/pki---issue.
    src/pki/man/pki---keyid.
    src/pki/man/pki---pkcs7.
    src/pki/man/pki---print.
    src/pki/man/pki---pub.
    src/pki/man/pki---req.
    src/pki/man/pki---self.
    src/pki/man/pki---signcrl.
    src/pki/man/pki---verify.
])

AC_OUTPUT

# ========================
#  report enabled plugins
# ========================

//打印
AC_MSG_RESULT([])
AC_MSG_RESULT([ strongSwan will be built with the following plugins])
AC_MSG_RESULT([-----------------------------------------------------])

AC_MSG_RESULT([libstrongswan:$s_plugins])
AC_MSG_RESULT([libcharon:    $c_plugins])
AC_MSG_RESULT([libhydra:     $h_plugins])
AC_MSG_RESULT([libtnccs:     $t_plugins])
AC_MSG_RESULT([])