#!/bin/sh
# =======================================================================
#
# chronyd/chronyc - Programs for keeping computer clocks accurate.
#
# Copyright (C) Richard P. Curnow  1997-2003
# Copyright (C) Bryan Christianson  2016
# Copyright (C) Miroslav Lichvar  2009, 2012-2021
# Copyright (C) Stefan R. Filipek  2019
#
# =======================================================================

# This configure script determines the operating system type and version

# ======================================================================
# FUNCTIONS

#{{{ test_code
test_code () {
  name=$1
  headers=$2
  cflags=$3
  ldflags=$4
  code=$5

  printf "%s" "Checking for $name : "

  (
    echo "#include \"config.h\""
    for h in $headers; do
      echo "#include <$h>"
    done
    echo "int main(int argc, char **argv) {"
    echo "$code"
    echo "return 0; }"
  ) > conftest.c

  echo "conftest.c:" >> config.log
  cat conftest.c >> config.log
  echo $MYCC $MYCFLAGS $MYCPPFLAGS $cflags -o conftest conftest.c $ldflags \
    $MYLDFLAGS >> config.log
  $MYCC $MYCFLAGS $MYCPPFLAGS $cflags -o conftest conftest.c $ldflags \
    $MYLDFLAGS >> config.log 2>&1

  if [ $? -eq 0 ]
  then
    echo "Yes"
    result=0
  else
    echo "No"
    result=1
  fi
  rm -f conftest.c conftest
  echo >> config.log
  return $result
}
#}}}
#{{{ test_executable
test_executable () {
  name=$1
  executable=$2
  options=$3

  printf "%s" "Checking for $name : "

  echo $executable $options >> config.log
  $executable $options >> config.log 2>&1

  if [ $? -eq 0 ]
  then
    echo "Yes"
    result=0
  else
    echo "No"
    result=1
  fi
  echo >> config.log
  return $result
}
#}}}
#{{{ pkg_config
pkg_config () {
  $PKG_CONFIG "$@" 2>> config.log
}
#}}}
#{{{ usage
usage () {
  cat <<EOF
\`configure' configures this package to adapt to many kinds of systems.

Usage: ./configure [OPTION]...

Defaults for the options are specified in brackets.

Configuration:
  -h, --help              display this help and exit

Installation directories:
  --prefix=PREFIX         install architecture-independent files in PREFIX
                          [/usr/local]
  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
                          [PREFIX]

By default, \`make install' will install all the files in
\`/usr/local/bin', \`/usr/local/lib' etc.  You can specify
an installation prefix other than \`/usr/local' using \`--prefix',
for instance \`--prefix=$HOME'.

For better control, use the options below.
  --disable-readline     Disable line editing support
  --without-editline     Don't use editline even if it is available
  --disable-sechash      Disable support for hashes other than MD5
  --without-nettle       Don't use nettle even if it is available
  --without-nss          Don't use NSS even if it is available
  --without-tomcrypt     Don't use libtomcrypt even if it is available
  --disable-nts          Disable NTS support
  --without-gnutls       Don't use gnutls even if it is available
  --disable-cmdmon       Disable command and monitoring support
  --disable-ntp          Disable NTP support
  --disable-refclock     Disable reference clock support
  --disable-phc          Disable PHC refclock driver
  --disable-pps          Disable PPS refclock driver
  --disable-ipv6         Disable IPv6 support
  --disable-rtc          Don't include RTC even on Linux
  --disable-privdrop     Disable support for dropping root privileges
  --without-libcap       Don't use libcap even if it is available
  --enable-scfilter      Enable support for system call filtering
  --without-seccomp      Don't use seccomp even if it is available
  --disable-asyncdns     Disable asynchronous name resolving
  --disable-forcednsretry Don't retry on permanent DNS error
  --without-clock-gettime Don't use clock_gettime() even if it is available
  --disable-timestamping Disable support for SW/HW timestamping
  --enable-ntp-signd     Enable support for MS-SNTP authentication in Samba
  --with-ntp-era=SECONDS Specify earliest assumed NTP time in seconds
                         since 1970-01-01 [50*365 days ago]
  --with-user=USER       Specify default chronyd user [root]
  --with-hwclockfile=PATH Specify default path to hwclock(8) adjtime file
  --with-pidfile=PATH    Specify default pidfile [/var/run/chrony/chronyd.pid]
  --with-rtcdevice=PATH  Specify default path to RTC device [/dev/rtc]
  --with-sendmail=PATH   Path to sendmail binary [/usr/lib/sendmail]
  --enable-debug         Enable debugging support

Fine tuning of the installation directories:
  --sysconfdir=DIR       chrony.conf location [/etc]
  --bindir=DIR           user executables [EPREFIX/bin]
  --sbindir=DIR          system admin executables [EPREFIX/sbin]
  --datarootdir=DIR      data root [PREFIX/share]
  --mandir=DIR           man documentation [DATAROOTDIR/man]
  --docdir=DIR           documentation root [DATAROOTDIR/doc/chrony]
  --localstatedir=DIR    modifiable single-machine data [/var]
  --chronyrundir=DIR     location for chrony sockets [LOCALSTATEDIR/run/chrony]
  --chronyvardir=DIR     location for chrony data [LOCALSTATEDIR/lib/chrony]

Overriding system detection when cross-compiling:
  --host-system=OS       Specify system name (uname -s)
  --host-release=REL     Specify system release (uname -r)
  --host-machine=CPU     Specify machine (uname -m)

Some influential environment variables:
  CC          C compiler command
  CFLAGS      C compiler flags
  CPPFLAGS    C preprocessor flags, e.g. -I<include dir> if you have
              headers in a nonstandard directory <include dir>
  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
              nonstandard directory <lib dir>
  PKG_CONFIG  path to pkg-config utility
  PKG_CONFIG_PATH
              directories to add to pkg-config's search path
  PKG_CONFIG_LIBDIR
              path overriding pkg-config's built-in search path

Use these variables to override the choices made by \`configure' or to help
it to find libraries and programs with nonstandard names/locations.

EOF

}
#}}}
#{{{
add_def () {
  if [ "x$2" = "x" ]; then
    echo "#define $1 1" >> config.h
  else
    echo "#define $1 $2" >> config.h
  fi
}
#}}}
#{{{ get_features
get_features () {
  ff=1
  for f; do
    if [ "$ff" = "0" ]; then
      printf " "
    fi
    if grep "define FEAT_$f" config.h > /dev/null; then
      printf "%s" "+$f"
    else
      printf "%s" "-$f"
    fi
    ff=0
  done
}
#}}}

# ======================================================================


OPERATINGSYSTEM=`uname -s`
VERSION=`uname -r`
MACHINE=`uname -m`

LIBS=""
EXTRA_LIBS=""
EXTRA_CLI_LIBS=""
EXTRA_OBJECTS=""
EXTRA_CLI_OBJECTS=""

feat_debug=0
feat_cmdmon=1
feat_ntp=1
feat_refclock=1
feat_readline=1
try_editline=1
feat_sechash=1
try_nettle=1
try_nss=1
try_tomcrypt=1
feat_nts=1
try_gnutls=1
feat_rtc=1
try_rtc=0
feat_droproot=1
try_libcap=-1
try_clockctl=0
feat_scfilter=0
try_seccomp=-1
priv_ops=""
feat_ipv6=1
feat_phc=1
try_phc=0
feat_pps=1
try_setsched=0
try_lockmem=0
feat_asyncdns=1
feat_forcednsretry=1
try_clock_gettime=1
try_recvmmsg=1
feat_timestamping=1
try_timestamping=0
feat_ntp_signd=0
ntp_era_split=""
use_pthread=0
default_user="root"
default_hwclockfile=""
default_pidfile="/var/run/chrony/chronyd.pid"
default_rtcdevice="/dev/rtc"
mail_program="/usr/lib/sendmail"

for option
do
    case "$option" in
    --enable-debug )
      feat_debug=1
    ;;
    --disable-readline )
      feat_readline=0
    ;;
    --without-editline )
      try_editline=0
    ;;
    --prefix=* | --install_prefix=* )
      SETPREFIX=`echo $option | sed -e 's/[^=]*=//;'`
    ;;
    --exec-prefix=* )
      SETEPREFIX=`echo $option | sed -e 's/[^=]*=//;'`
    ;;
    --sysconfdir=* )
      SETSYSCONFDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --bindir=* )
      SETBINDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --sbindir=* )
      SETSBINDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --datarootdir=* )
      SETDATAROOTDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --mandir=* )
      SETMANDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --docdir=* )
      SETDOCDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --localstatedir=* )
      SETLOCALSTATEDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --chronyrundir=* | --chronysockdir=* )
      SETCHRONYRUNDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --chronyvardir=* )
      SETCHRONYVARDIR=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --disable-cmdmon)
      feat_cmdmon=0
    ;;
    --disable-ntp)
      feat_ntp=0
    ;;
    --disable-refclock)
      feat_refclock=0
    ;;
    --disable-rtc)
      feat_rtc=0
    ;;
    --disable-ipv6)
      feat_ipv6=0
    ;;
    --disable-phc)
      feat_phc=0
    ;;
    --disable-pps)
      feat_pps=0
    ;;
    --disable-privdrop)
      feat_droproot=0
    ;;
    --without-libcap|--disable-linuxcaps)
      try_libcap=0
    ;;
    --enable-scfilter)
      feat_scfilter=1
    ;;
    --disable-scfilter)
      feat_scfilter=0
    ;;
    --without-seccomp)
      try_seccomp=0
    ;;
    --disable-asyncdns)
      feat_asyncdns=0
    ;;
    --disable-forcednsretry)
      feat_forcednsretry=0
    ;;
    --without-clock-gettime)
      try_clock_gettime=0
    ;;
    --disable-timestamping)
      feat_timestamping=0
    ;;
    --enable-ntp-signd)
      feat_ntp_signd=1
    ;;
    --with-ntp-era=* )
      ntp_era_split=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-user=* )
      default_user=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-hwclockfile=* )
      default_hwclockfile=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-pidfile=* )
      default_pidfile=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-rtcdevice=* )
      default_rtcdevice=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --with-sendmail=* )
      mail_program=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --disable-sechash )
      feat_sechash=0
    ;;
    --without-nettle )
      try_nettle=0
    ;;
    --without-nss )
      try_nss=0
    ;;
    --without-tomcrypt )
      try_tomcrypt=0
    ;;
    --disable-nts )
      feat_nts=0
    ;;
    --without-gnutls )
      try_gnutls=0
    ;;
    --host-system=* )
      OPERATINGSYSTEM=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --host-release=* )
      VERSION=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --host-machine=* )
      MACHINE=`echo $option | sed -e 's/^.*=//;'`
    ;;
    --help | -h )
      usage
      exit 0
    ;;
    * )
    echo "Unrecognized option : " $option
    esac
done

rm -f config.h config.log

SYSTEM=${OPERATINGSYSTEM}-${MACHINE}

case $OPERATINGSYSTEM in
    Linux)
        EXTRA_OBJECTS="sys_generic.o sys_linux.o sys_timex.o sys_posix.o"
        [ $try_libcap != "0" ] && try_libcap=1
        try_rtc=1
        [ $try_seccomp != "0" ] && try_seccomp=1
        try_timestamping=1
        try_setsched=1
        try_lockmem=1
        try_phc=1
        add_def LINUX
        echo "Configuring for " $SYSTEM
    ;;
    FreeBSD)
        # recvmmsg() seems to be broken on FreeBSD 11.0 and it's just
        # a wrapper around recvmsg()
        try_recvmmsg=0
        EXTRA_OBJECTS="sys_generic.o sys_netbsd.o sys_timex.o sys_posix.o"
        try_setsched=1
        try_lockmem=1
        add_def FREEBSD
        if [ $feat_droproot = "1" ]; then
          add_def FEAT_PRIVDROP
          priv_ops="ADJUSTTIME ADJUSTTIMEX SETTIME BINDSOCKET"
        fi
        echo "Configuring for $SYSTEM"
    ;;
    NetBSD)
        EXTRA_OBJECTS="sys_generic.o sys_netbsd.o sys_timex.o sys_posix.o"
        try_clockctl=1
        try_setsched=1
        try_lockmem=1
        add_def NETBSD
        echo "Configuring for $SYSTEM"
    ;;
    Darwin)
        EXTRA_OBJECTS="sys_macosx.o"
        LIBS="$LIBS -lresolv"
        add_def MACOSX
        if [ $feat_droproot = "1" ]; then
          add_def FEAT_PRIVDROP
          priv_ops="ADJUSTTIME SETTIME BINDSOCKET"
        fi
        major=`echo $VERSION | cut -d. -f1`
        # ntp_adjtime is not available in macOS 10.12 (Darwin 16.x.x) and earlier
        if [ $major -gt "16" ]; then
          add_def HAVE_MACOS_SYS_TIMEX
          EXTRA_OBJECTS="$EXTRA_OBJECTS sys_generic.o sys_netbsd.o sys_timex.o"
          if [ $feat_droproot = "1" ]; then
            priv_ops="$priv_ops ADJUSTTIMEX"
          fi
        fi
        echo "Configuring for macOS (" $SYSTEM "macOS version" $VERSION ")"
    ;;
    SunOS)
        EXTRA_OBJECTS="sys_generic.o sys_solaris.o sys_timex.o sys_posix.o"
        LIBS="$LIBS -lsocket -lnsl -lkvm -lelf -lresolv"
        try_setsched=1
        try_lockmem=1
        add_def SOLARIS
        # These are needed to have msg_control in struct msghdr
        add_def __EXTENSIONS__
        add_def _XOPEN_SOURCE 1
        add_def _XOPEN_SOURCE_EXTENDED 1
        if [ $feat_droproot = "1" ]; then
          add_def FEAT_PRIVDROP
          priv_ops="ADJUSTTIMEX SETTIME BINDSOCKET"
        fi
        echo "Configuring for illumos (" $SYSTEM "SunOS version" $VERSION ")"
    ;;                                                                        
    * )
        echo "error: $SYSTEM is not supported (yet?)"
        exit 1
    ;;
esac

if [ $feat_debug = "1" ]; then
  add_def FEAT_DEBUG
fi
add_def DEBUG $feat_debug

if [ $feat_cmdmon = "1" ]; then
  add_def FEAT_CMDMON
  EXTRA_OBJECTS="$EXTRA_OBJECTS cmdmon.o manual.o pktlength.o"
fi

if [ $feat_ntp = "1" ]; then
  add_def FEAT_NTP
  EXTRA_OBJECTS="$EXTRA_OBJECTS ntp_auth.o ntp_core.o ntp_ext.o ntp_io.o ntp_sources.o"
  if [ $feat_ntp_signd = "1" ]; then
    add_def FEAT_SIGND
    EXTRA_OBJECTS="$EXTRA_OBJECTS ntp_signd.o"
  fi
else
  feat_asyncdns=0
  feat_timestamping=0
fi

if [ "$feat_cmdmon" = "1" ] || [ $feat_ntp = "1" ]; then
  EXTRA_OBJECTS="$EXTRA_OBJECTS addrfilt.o clientlog.o keys.o nameserv.o"
else
  feat_ipv6=0
fi

if [ $feat_refclock = "1" ]; then
  add_def FEAT_REFCLOCK
  EXTRA_OBJECTS="$EXTRA_OBJECTS refclock.o refclock_phc.o refclock_pps.o refclock_shm.o refclock_sock.o"
fi

MYCC="$CC"
MYCFLAGS="$CFLAGS"
MYCPPFLAGS="$CPPFLAGS"
MYLDFLAGS="$LDFLAGS"

if [ "x$MYCC" = "x" ]; then
  for cc in gcc clang cc ""; do
    if [ "x$cc" = "x" ]; then
      echo "error: no C compiler found"
      exit 1
    fi
    MYCC=$cc
    if test_code "$MYCC" '' '' '' ''; then
      break
    fi
  done
else
  if ! test_code "$MYCC" '' '' '' ''; then
    echo "error: C compiler $MYCC cannot create executables"
    exit 1
  fi
fi

if [ "x$MYCFLAGS" = "x" ]; then
  MYCFLAGS="-O2 -g"

  TESTCFLAGS="-D_FORTIFY_SOURCE=2 -fPIE"
  TESTLDFLAGS="-pie -Wl,-z,relro,-z,now"
  if test_code 'hardening compiler options' '' "$TESTCFLAGS" "$TESTLDFLAGS" ''; then
    MYCFLAGS="$MYCFLAGS $TESTCFLAGS"
    MYLDFLAGS="$MYLDFLAGS $TESTLDFLAGS"
  fi
  TESTCFLAGS="-fstack-protector-strong --param=ssp-buffer-size=4"
  if test_code '-fstack-protector-strong' '' "$TESTCFLAGS" '' ''; then
    MYCFLAGS="$MYCFLAGS $TESTCFLAGS"
  else
    TESTCFLAGS="-fstack-protector --param=ssp-buffer-size=4"
    if test_code '-fstack-protector' '' "$TESTCFLAGS" '' ''; then
      MYCFLAGS="$MYCFLAGS $TESTCFLAGS"
    fi
  fi
fi

if [ "x$MYCC" = "xgcc" ] || [ "x$MYCC" = "xclang" ]; then
  MYCFLAGS="$MYCFLAGS -Wmissing-prototypes -Wall"
fi

if [ "x$PKG_CONFIG" = "x" ]; then
  PKG_CONFIG=pkg-config
fi

if ! test_executable "pkg-config" $PKG_CONFIG --version; then
  try_nettle=0
  try_nss=0
  try_gnutls=0
fi

if test_code '64-bit time_t' 'time.h' '' '' '
  char x[sizeof(time_t) > 4 ? 1 : -1] = {0};
  return x[0];'
then
  add_def HAVE_LONG_TIME_T 1

  if [ "x$ntp_era_split" != "x" ]; then
    split_seconds=$ntp_era_split
    split_days=0
  else
    if [ "x$SOURCE_DATE_EPOCH" != "x" ]; then
      split_seconds=$SOURCE_DATE_EPOCH
    else
      split_seconds=`date '+%s'`
    fi
    if [ "x$split_seconds" = "x" ]; then
      echo "error: could not get current time, --with-ntp-era option is needed"
      exit 1
    fi
    split_days=$((50 * 365))
  fi

  add_def NTP_ERA_SPLIT "(${split_seconds}LL - $split_days * 24 * 3600)"

  date_format='+%Y-%m-%dT%H:%M:%SZ'

  # Print the full NTP interval if a suitable date is found
  if [ "x`date -u -d '1970-01-01 UTC 9 days ago 5 seconds 3 seconds' \
    $date_format 2> /dev/null`" = "x1969-12-23T00:00:08Z" ]
  then
    time1="`date -u -d "1970-01-01 UTC $split_days days ago $split_seconds seconds" \
      $date_format`"
    time2="`date -u -d "1970-01-01 UTC $split_days days ago $split_seconds seconds 4294967296 seconds" \
      $date_format`"
    echo "NTP time mapped to $time1/$time2"
  fi
fi

MATHCODE='return (int) pow(2.0, log(sqrt((double)argc)));'
if ! test_code 'math' 'math.h' '' '' "$MATHCODE"; then
  if test_code 'math in -lm' 'math.h' '' '-lm' "$MATHCODE"; then
    LIBS="$LIBS -lm"
  else
    echo "error: could not compile/link a program which uses sqrt(), log(), pow()"
    exit 1
  fi
fi
  
if test_code 'struct in_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
  struct in_pktinfo ipi;
  return sizeof (ipi.ipi_spec_dst.s_addr) + IP_PKTINFO;'
then
  add_def HAVE_IN_PKTINFO
fi

if [ $feat_ipv6 = "1" ] && \
  test_code 'IPv6 support' 'arpa/inet.h sys/socket.h netinet/in.h' '' "$LIBS" '
    struct sockaddr_in6 n;
    char p[100];
    n.sin6_addr = in6addr_any;
    n.sin6_scope_id = 0;
    return !inet_ntop(AF_INET6, &n.sin6_addr.s6_addr, p, sizeof(p));'
then
  add_def FEAT_IPV6
  if test_code 'struct in6_pktinfo' 'sys/socket.h netinet/in.h' '' '' '
    return sizeof (struct in6_pktinfo) + IPV6_PKTINFO;'
  then
    add_def HAVE_IN6_PKTINFO
  else
    if test_code 'struct in6_pktinfo with _GNU_SOURCE' 'sys/socket.h netinet/in.h' \
      '-D_GNU_SOURCE' '' 'return sizeof (struct in6_pktinfo) + IPV6_PKTINFO;'
    then
      add_def _GNU_SOURCE
      add_def HAVE_IN6_PKTINFO
    fi
  fi
fi

if ! test_code 'O_NOFOLLOW flag' 'sys/types.h sys/stat.h fcntl.h' '' "$LIBS" \
  'return open("/dev/null", O_NOFOLLOW);'
then
  if test_code 'O_NOFOLLOW flag with _GNU_SOURCE' 'sys/types.h sys/stat.h fcntl.h' \
    '-D_GNU_SOURCE' "$LIBS" \
    'return open("/dev/null", O_NOFOLLOW);'
  then
    add_def _GNU_SOURCE
  else
    echo "error: open() does not support O_NOFOLLOW flag"
    exit 1
  fi
fi

if [ $try_clock_gettime = "1" ]; then
  if test_code 'clock_gettime()' 'time.h' '' '' \
    'clock_gettime(CLOCK_REALTIME, NULL);'
  then
    add_def HAVE_CLOCK_GETTIME
  else
    if test_code 'clock_gettime() in -lrt' 'time.h' '' '-lrt' \
      'clock_gettime(CLOCK_REALTIME, NULL);'
    then
      add_def HAVE_CLOCK_GETTIME
      EXTRA_LIBS="$EXTRA_LIBS -lrt"
    fi
  fi
fi

if ! test_code 'getaddrinfo()' 'sys/types.h sys/socket.h netdb.h' '' "$LIBS" \
  'return getaddrinfo(0, 0, 0, 0);'
then
  echo "error: getaddrinfo() not found"
  exit 1
fi

if [ $feat_asyncdns = "1" ] && \
  test_code 'pthread' 'pthread.h' '-pthread' '' '
    pthread_t thread;
    return (int)pthread_create(&thread, NULL, (void *)1, NULL);'
then
  add_def FEAT_ASYNCDNS
  add_def USE_PTHREAD_ASYNCDNS
  EXTRA_OBJECTS="$EXTRA_OBJECTS nameserv_async.o"
  use_pthread=1
fi

if test_code 'arc4random_buf()' 'stdlib.h' '' '' 'arc4random_buf(NULL, 0);'; then
  add_def HAVE_ARC4RANDOM
else
  if test_code 'getrandom()' 'stdlib.h sys/random.h' '' '' \
      'return getrandom(NULL, 256, 0);'; then
    add_def HAVE_GETRANDOM
  fi
fi

RECVMMSG_CODE='
  struct mmsghdr hdr;
  return !recvmmsg(0, &hdr, 1, MSG_DONTWAIT, 0);'
if [ $try_recvmmsg = "1" ]; then
  if test_code 'recvmmsg()' 'sys/socket.h' '' "$LIBS" "$RECVMMSG_CODE"; then
    add_def HAVE_RECVMMSG
  else
    if test_code 'recvmmsg() with _GNU_SOURCE' 'sys/socket.h' '-D_GNU_SOURCE' \
      "$LIBS" "$RECVMMSG_CODE"
    then
      add_def _GNU_SOURCE
      add_def HAVE_RECVMMSG
    fi
  fi
fi

if [ $feat_timestamping = "1" ] && [ $try_timestamping = "1" ] &&
  test_code 'SW/HW timestamping' 'sys/types.h sys/socket.h linux/net_tstamp.h
                                  linux/errqueue.h linux/ptp_clock.h' '' '' '
    int val = SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_RX_SOFTWARE |
              SOF_TIMESTAMPING_RAW_HARDWARE | SOF_TIMESTAMPING_OPT_CMSG;
    return sizeof (struct scm_timestamping) + SCM_TSTAMP_SND + PTP_SYS_OFFSET +
           setsockopt(0, SOL_SOCKET, SO_SELECT_ERR_QUEUE + SO_TIMESTAMPING,
                      &val, sizeof (val));'
then
  add_def HAVE_LINUX_TIMESTAMPING
  EXTRA_OBJECTS="$EXTRA_OBJECTS hwclock.o ntp_io_linux.o"

  if test_code 'other timestamping options' \
    'sys/types.h sys/socket.h linux/net_tstamp.h' '' '' '
    struct scm_ts_pktinfo pktinfo;
    pktinfo.if_index = pktinfo.pkt_length = 0;
    return pktinfo.if_index + pktinfo.pkt_length + HWTSTAMP_FILTER_NTP_ALL +
           SCM_TIMESTAMPING_PKTINFO +
           SOF_TIMESTAMPING_OPT_PKTINFO + SOF_TIMESTAMPING_OPT_TX_SWHW;'; then
    add_def HAVE_LINUX_TIMESTAMPING_RXFILTER_NTP 1
    add_def HAVE_LINUX_TIMESTAMPING_OPT_PKTINFO 1
    add_def HAVE_LINUX_TIMESTAMPING_OPT_TX_SWHW 1
  fi
fi

timepps_h=""
if [ $feat_refclock = "1" ] && [ $feat_pps = "1" ]; then
  if test_code '<sys/timepps.h>' 'inttypes.h time.h sys/timepps.h' '' '' ''; then
    timepps_h="sys/timepps.h"
    add_def HAVE_SYS_TIMEPPS_H
  else
    if test_code '<timepps.h>' 'inttypes.h time.h timepps.h' '' '' ''; then
      timepps_h="timepps.h"
      add_def HAVE_TIMEPPS_H
    fi
  fi
fi

if [ "x$timepps_h" != "x" ] && \
  test_code 'PPSAPI' "inttypes.h string.h time.h $timepps_h" '' '' '
    pps_handle_t h = 0;
    pps_info_t i;
    struct timespec ts;
    ts.tv_sec = ts.tv_nsec = 0;
    return time_pps_fetch(h, PPS_TSFMT_TSPEC, &i, &ts);'
then
  add_def FEAT_PPS
fi

if [ $feat_droproot = "1" ] && [ $try_libcap = "1" ] && \
  test_code \
    libcap \
    'sys/types.h pwd.h sys/prctl.h sys/capability.h grp.h' \
    '' '-lcap' \
    'prctl(PR_SET_KEEPCAPS, 1);cap_set_proc(cap_from_text("cap_sys_time=ep"));'
then
    add_def FEAT_PRIVDROP
    EXTRA_LIBS="$EXTRA_LIBS -lcap"
fi

if [ $feat_droproot = "1" ] && [ $try_clockctl = "1" ] && \
  test_code '<sys/clockctl.h>' 'sys/clockctl.h' '' '' ''
then
  add_def FEAT_PRIVDROP
  priv_ops="BINDSOCKET"
fi

if [ $feat_scfilter = "1" ] && [ $try_seccomp = "1" ] && \
  test_code seccomp 'seccomp.h' '' '-lseccomp' \
    'seccomp_init(SCMP_ACT_KILL);'
then
  add_def FEAT_SCFILTER
  if [ $feat_ntp = "1" ]; then
    # NAME2IPADDRESS shouldn't be enabled together with a privops operation
    # used by the main thread as the helper process works on one request at
    # a time and the async resolver would block the main thread
    priv_ops="NAME2IPADDRESS RELOADDNS"
  fi
  EXTRA_LIBS="$EXTRA_LIBS -lseccomp"
fi

if [ "x$priv_ops" != "x" ]; then
  EXTRA_OBJECTS="$EXTRA_OBJECTS privops.o"
  add_def PRIVOPS_HELPER
  for o in $priv_ops; do
    add_def PRIVOPS_$o
  done
fi

if [ $feat_rtc = "1" ] && [ $try_rtc = "1" ] && \
  test_code '<linux/rtc.h>' 'sys/ioctl.h linux/rtc.h' '' '' \
    'ioctl(1, RTC_UIE_ON&RTC_UIE_OFF&RTC_RD_TIME&RTC_SET_TIME, 0&RTC_UF);'
then
    EXTRA_OBJECTS="$EXTRA_OBJECTS rtc_linux.o"
    add_def FEAT_RTC
fi

if [ $feat_refclock = "1" ] && [ $feat_phc = "1" ] && [ $try_phc = "1" ] && \
  grep '#define HAVE_CLOCK_GETTIME' config.h > /dev/null && \
  test_code '<linux/ptp_clock.h>' 'sys/ioctl.h linux/ptp_clock.h' '' '' \
    'ioctl(1, PTP_CLOCK_GETCAPS + PTP_SYS_OFFSET, 0);'
then
  grep 'HAVE_LINUX_TIMESTAMPING' config.h > /dev/null ||
    EXTRA_OBJECTS="$EXTRA_OBJECTS hwclock.o"
  add_def FEAT_PHC
fi

if [ $try_setsched = "1" ] && \
  test_code \
    'pthread_setschedparam()' \
    'pthread.h sched.h' '-pthread' '' '
     struct sched_param sched;
     sched_get_priority_max(SCHED_FIFO);
     pthread_setschedparam(pthread_self(), SCHED_FIFO, &sched);'
then
  add_def HAVE_PTHREAD_SETSCHEDPARAM
  use_pthread=1
fi

if [ $try_lockmem = "1" ] && \
  test_code \
    'mlockall()' \
    'sys/mman.h' '' '' '
     mlockall(MCL_CURRENT|MCL_FUTURE);'
then
  add_def HAVE_MLOCKALL
fi
if [ $try_lockmem = "1" ] && \
  test_code \
    'setrlimit(RLIMIT_MEMLOCK, ...)' \
    'sys/resource.h' '' '' '
     struct rlimit rlim;
     rlim.rlim_max = rlim.rlim_cur = RLIM_INFINITY;
     setrlimit(RLIMIT_MEMLOCK, &rlim);'
then
  add_def HAVE_SETRLIMIT_MEMLOCK
fi

if [ $feat_forcednsretry = "1" ]
then
  add_def FORCE_DNSRETRY
fi

READLINE_LINK=""
if [ $feat_readline = "1" ]; then
  if [ $try_editline = "1" ]; then
    if test_code editline 'stdio.h editline/readline.h' '' '-ledit' \
      'add_history(readline("prompt"));'
    then
      add_def FEAT_READLINE
      READLINE_LINK="-ledit"
    fi
  fi

  EXTRA_CLI_LIBS="$EXTRA_CLI_LIBS $READLINE_LINK"
fi

HASH_OBJ="hash_intmd5.o"
HASH_LINK=""

if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nettle = "1" ]; then
  test_cflags="`pkg_config --cflags nettle`"
  test_link="`pkg_config --libs nettle`"
  if test_code 'nettle' 'nettle/nettle-meta.h nettle/sha2.h' \
    "$test_cflags" "$test_link" \
    'return nettle_hashes[0]->context_size;'
  then
    HASH_OBJ="hash_nettle.o"
    HASH_LINK="$test_link"
    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
    add_def FEAT_SECHASH

    if test_code 'CMAC in nettle' 'nettle/cmac.h' "$test_cflags" "$test_link" \
      'cmac128_update(NULL, NULL, NULL, 0, NULL);'
    then
      add_def HAVE_CMAC
      EXTRA_OBJECTS="$EXTRA_OBJECTS cmac_nettle.o"
      EXTRA_CLI_OBJECTS="$EXTRA_CLI_OBJECTS cmac_nettle.o"
    fi
  fi
fi

if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ]  && [ $try_nss = "1" ]; then
  test_cflags="`pkg_config --cflags nss`"
  test_link="`pkg_config --libs-only-L nss` -lfreebl3 -lnssutil3"
  if test_code 'NSS' 'nss.h hasht.h nsslowhash.h' \
    "$test_cflags" "$test_link" \
    'NSSLOWHASH_Begin(NSSLOWHASH_NewContext(NSSLOW_Init(), HASH_AlgSHA512));'
  then
    HASH_OBJ="hash_nss.o"
    HASH_LINK="$test_link"
    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
    add_def FEAT_SECHASH
  fi
fi

if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ] && [ $try_tomcrypt = "1" ]; then
  if test_code 'tomcrypt' 'tomcrypt.h' '-I/usr/include/tomcrypt' '-ltomcrypt' \
    'hash_memory_multi(find_hash("md5"), NULL, NULL, NULL, 0, NULL, 0);'
  then
    HASH_OBJ="hash_tomcrypt.o"
    HASH_LINK="-ltomcrypt"
    MYCPPFLAGS="$MYCPPFLAGS -I/usr/include/tomcrypt"
    add_def FEAT_SECHASH
  fi
fi

if [ $feat_sechash = "1" ] && [ "x$HASH_LINK" = "x" ] && [ $try_gnutls = "1" ]; then
  test_cflags="`pkg_config --cflags gnutls`"
  test_link="`pkg_config --libs gnutls`"
  if test_code 'gnutls' 'gnutls/crypto.h' \
    "$test_cflags" "$test_link" '
      return gnutls_hash(NULL, NULL, 0);'
  then
    HASH_OBJ="hash_gnutls.o"
    HASH_LINK="$test_link"
    MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
    add_def FEAT_SECHASH

    if test_code 'CMAC in gnutls' 'gnutls/crypto.h' "$test_cflags" "$test_link" \
      'return gnutls_hmac_init(NULL, GNUTLS_MAC_AES_CMAC_128, NULL, 0);'
    then
      add_def HAVE_CMAC
      EXTRA_OBJECTS="$EXTRA_OBJECTS cmac_gnutls.o"
      EXTRA_CLI_OBJECTS="$EXTRA_CLI_OBJECTS cmac_gnutls.o"
    fi
  fi
fi

EXTRA_OBJECTS="$EXTRA_OBJECTS $HASH_OBJ"
EXTRA_CLI_OBJECTS="$EXTRA_CLI_OBJECTS $HASH_OBJ"
LIBS="$LIBS $HASH_LINK"

if [ $feat_ntp = "1" ] && [ $feat_nts = "1" ] && [ $try_gnutls = "1" ]; then
  if [ "$HASH_OBJ" = "hash_gnutls.o" ]; then
    test_cflags=""
    test_link=""
  else
    test_cflags="`pkg_config --cflags gnutls`"
    test_link="`pkg_config --libs gnutls`"
  fi
  if test_code 'TLS1.3 in gnutls' 'gnutls/gnutls.h' \
    "$test_cflags" "$test_link $LIBS" '
      return gnutls_init(NULL, 0) + GNUTLS_TLS1_3 +
        gnutls_priority_init2(NULL, "", NULL, GNUTLS_PRIORITY_INIT_DEF_APPEND) +
        gnutls_prf_rfc5705(NULL, 0, "", 0, "", 16, NULL);'
  then
    if test_code 'SIV in nettle' \
      'nettle/siv-cmac.h' "" "$LIBS" \
      'siv_cmac_aes128_set_key(NULL, NULL);'
    then
      EXTRA_OBJECTS="$EXTRA_OBJECTS siv_nettle.o"
      add_def HAVE_SIV
      add_def HAVE_NETTLE_SIV_CMAC
    else
      if test_code 'SIV in gnutls' 'gnutls/crypto.h' \
        "$test_cflags" "$test_link $LIBS" '
          return gnutls_aead_cipher_init(NULL, GNUTLS_CIPHER_AES_128_SIV, NULL);'
      then
        EXTRA_OBJECTS="$EXTRA_OBJECTS siv_gnutls.o"
        add_def HAVE_SIV
      else
        if test_code 'AES128 in nettle' 'nettle/aes.h' '' "$LIBS" \
          'aes128_set_encrypt_key(NULL, NULL);'
        then
          EXTRA_OBJECTS="$EXTRA_OBJECTS siv_nettle.o"
          add_def HAVE_SIV
        fi
      fi
    fi

    if grep '#define HAVE_SIV' config.h > /dev/null; then
      EXTRA_OBJECTS="$EXTRA_OBJECTS nts_ke_client.o nts_ke_server.o nts_ke_session.o"
      EXTRA_OBJECTS="$EXTRA_OBJECTS nts_ntp_auth.o nts_ntp_client.o nts_ntp_server.o"
      LIBS="$LIBS $test_link"
      MYCPPFLAGS="$MYCPPFLAGS $test_cflags"
      add_def FEAT_NTS
    fi
  fi
fi

if [ $use_pthread = "1" ]; then
  MYCFLAGS="$MYCFLAGS -pthread"
fi

SYSCONFDIR=/etc
if [ "x$SETSYSCONFDIR" != "x" ]; then
  SYSCONFDIR=$SETSYSCONFDIR
fi

PREFIX=/usr/local
if [ "x$SETPREFIX" != "x" ]; then
  PREFIX=$SETPREFIX
fi

EPREFIX=${PREFIX}
if [ "x$SETEPREFIX" != "x" ]; then
  EPREFIX=$SETEPREFIX
fi

BINDIR=${EPREFIX}/bin
if [ "x$SETBINDIR" != "x" ]; then
  BINDIR=$SETBINDIR
fi

SBINDIR=${EPREFIX}/sbin
if [ "x$SETSBINDIR" != "x" ]; then
  SBINDIR=$SETSBINDIR
fi

DATAROOTDIR=${PREFIX}/share
if [ "x$SETDATAROOTDIR" != "x" ]; then
  DATAROOTDIR=$SETDATAROOTDIR
fi

MANDIR=${DATAROOTDIR}/man
if [ "x$SETMANDIR" != "x" ]; then
  MANDIR=$SETMANDIR
fi

DOCDIR=${DATAROOTDIR}/doc/chrony
if [ "x$SETDOCDIR" != "x" ]; then
  DOCDIR=$SETDOCDIR
fi

LOCALSTATEDIR=/var
if [ "x$SETLOCALSTATEDIR" != "x" ]; then
  LOCALSTATEDIR=$SETLOCALSTATEDIR
fi

CHRONYRUNDIR=${LOCALSTATEDIR}/run/chrony
if [ "x$SETCHRONYRUNDIR" != "x" ]; then
  CHRONYRUNDIR=$SETCHRONYRUNDIR
fi

CHRONYVARDIR=${LOCALSTATEDIR}/lib/chrony
if [ "x$SETCHRONYVARDIR" != "x" ]; then
  CHRONYVARDIR=$SETCHRONYVARDIR
fi

add_def DEFAULT_CONF_FILE "\"$SYSCONFDIR/chrony.conf\""
add_def DEFAULT_HWCLOCK_FILE "\"$default_hwclockfile\""
add_def DEFAULT_PID_FILE "\"$default_pidfile\""
add_def DEFAULT_RTC_DEVICE "\"$default_rtcdevice\""
add_def DEFAULT_USER "\"$default_user\""
add_def DEFAULT_COMMAND_SOCKET "\"$CHRONYRUNDIR/chronyd.sock\""
add_def MAIL_PROGRAM "\"$mail_program\""

common_features="`get_features SECHASH IPV6 DEBUG`"
chronyc_features="`get_features READLINE`"
chronyd_features="`get_features CMDMON NTP REFCLOCK RTC PRIVDROP SCFILTER SIGND ASYNCDNS NTS`"
add_def CHRONYC_FEATURES "\"$chronyc_features $common_features\""
add_def CHRONYD_FEATURES "\"$chronyd_features $common_features\""
echo "Features : $chronyd_features $chronyc_features $common_features"

if [ -f version.txt ]; then
  CHRONY_VERSION="`cat version.txt`"
else
  CHRONY_VERSION="DEVELOPMENT"
fi

add_def CHRONY_VERSION "\"${CHRONY_VERSION}\""

for f in Makefile doc/Makefile test/unit/Makefile
do
  echo Creating $f
  sed -e "s%@EXTRA_OBJS@%${EXTRA_OBJECTS}%;\
          s%@EXTRA_CLI_OBJS@%${EXTRA_CLI_OBJECTS}%;\
          s%@CC@%${MYCC}%;\
          s%@CFLAGS@%${MYCFLAGS}%;\
          s%@CPPFLAGS@%${MYCPPFLAGS}%;\
          s%@LDFLAGS@%${MYLDFLAGS}%;\
          s%@LIBS@%${LIBS}%;\
          s%@EXTRA_LIBS@%${EXTRA_LIBS}%;\
          s%@EXTRA_CLI_LIBS@%${EXTRA_CLI_LIBS}%;\
          s%@SYSCONFDIR@%${SYSCONFDIR}%;\
          s%@BINDIR@%${BINDIR}%;\
          s%@SBINDIR@%${SBINDIR}%;\
          s%@DOCDIR@%${DOCDIR}%;\
          s%@MANDIR@%${MANDIR}%;\
          s%@LOCALSTATEDIR@%${LOCALSTATEDIR}%;\
          s%@CHRONYRUNDIR@%${CHRONYRUNDIR}%;\
          s%@CHRONYVARDIR@%${CHRONYVARDIR}%;\
          s%@DEFAULT_HWCLOCK_FILE@%${default_hwclockfile}%;\
          s%@DEFAULT_PID_FILE@%${default_pidfile}%;\
          s%@DEFAULT_RTC_DEVICE@%${default_rtcdevice}%;\
          s%@DEFAULT_USER@%${default_user}%;\
          s%@CHRONY_VERSION@%${CHRONY_VERSION}%;" \
          < ${f}.in > $f
done

# =======================================================================
# vim:et:sw=2:ht=2:sts=2:fdm=marker:cms=#%s