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configure.ac
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dnl +------------------------------------------------------------------+
dnl | Network UPS Tools: configure.ac |
dnl +------------------------------------------------------------------+
dnl NUT version number is defined here, with a Git suffixed macro like
dnl NUT_VERSION_MACRO "2.7.4-2838-gdfc3ac08"
dnl in include/nut_version.h (generated by make)
AC_INIT([nut],[2.8.0.1],[https://github.com/networkupstools/nut/issues])
dnl See docs/maintainer-guide.txt about releases - updating the version
dnl above is a small part of the consistent ritual!
dnl Note: this refers to GITREV at the time of configure script running
dnl primarily for better messaging in the script itself (also to render
dnl the PDF documentation revision history via docs/docinfo.xml.in).
dnl If the NUT codebase in this workspace is being developed and rebuilt
dnl without reconfiguration, detailed version in the binaries will differ
dnl (that one comes from the NUT_VERSION_MACRO from nut_version.h file).
(command -v git >/dev/null 2>/dev/null) \
&& NUT_SOURCE_GITREV="`(git describe --tags --match 'v[0-9]*.[0-9]*.[0-9]' --exclude '*-signed' --exclude '*rc*' --exclude '*alpha*' --exclude '*beta*' 2>/dev/null || git describe --tags --exclude '*rc*' --exclude '*alpha*' --exclude '*beta*' --exclude '*Windows*' --exclude '*IPM*' 2>/dev/null ) | sed -e 's/^v\([0-9]\)/\1/' -e 's,^.*/,,'`" \
|| NUT_SOURCE_GITREV=""
dnl Note: except for experiments, do not pass this into config.h - use
dnl the NUT_VERSION_MACRO from nut_version.h instead. Developers may
dnl want to disable their "force-nut-version-header" configure option
dnl to reduce rebuild scope and so speed up the iterations with ccache.
dnl New "config.h" contents for every reconfig would defeat that purpose!
dnl ### AS_IF([test -n "${NUT_SOURCE_GITREV-}"],
dnl ### [AC_DEFINE_UNQUOTED([NUT_SOURCE_GITREV], ["${NUT_SOURCE_GITREV}"], [NUT source revision when the build was configured])],
dnl ### [AC_DEFINE([NUT_SOURCE_GITREV], [NULL], [NUT source revision when the build was configured: not detected])])
dnl Keep track of command-line options passed to this script:
AC_MSG_CHECKING([for CONFIG_FLAGS])
CONFIG_FLAGS=""
dnl Keep each token quoted, in case spaces or other special chars crawl in:
_flag_enable_inplace_runtime=""
for F in "$@" ; do
case "$F" in
*=*" "*) NF="$(echo "$F" | sed "s,=,=',")""'" && F="$NF" ;;
esac
case "$F" in
--disable-inplace-runtime|--enable-inplace-runtime=no) _flag_enable_inplace_runtime="no" ;;
--enable-inplace-runtime*) _flag_enable_inplace_runtime="$F" ;;
*)
test -z "${CONFIG_FLAGS}" \
&& CONFIG_FLAGS="$F" \
|| CONFIG_FLAGS="${CONFIG_FLAGS} $F"
;;
esac
done
dnl Keep it "known" that we tried to re-use at least some local configuration
dnl so unspecified options are not necessarily at default values for this script
AS_IF([test x"${NUT_VERSION_DEPLOYED-}" = x"<reenter>"], [_flag_enable_inplace_runtime="reenter"])
F=""
AS_IF([test x"${NUT_VERSION_DEPLOYED-}" != x && test x"${NUT_VERSION_DEPLOYED-}" != x"<reenter>"], [
dnl Even if explicitly disabled... did we re-enter? Save the value to be seen:
F="--enable-inplace-runtime='${NUT_VERSION_DEPLOYED}'"
],[
AS_CASE(["${_flag_enable_inplace_runtime}"],
[no|""|reenter], [],
[F="${_flag_enable_inplace_runtime}"])
])
AS_IF([test x"$F" != x], [
test -z "${CONFIG_FLAGS}" \
&& CONFIG_FLAGS="$F" \
|| CONFIG_FLAGS="${CONFIG_FLAGS} $F"
])
unset _flag_enable_inplace_runtime
unset F
unset NF
AC_MSG_RESULT([${CONFIG_FLAGS}])
AC_DEFINE_UNQUOTED([CONFIG_FLAGS],["${CONFIG_FLAGS}"],[Flags passed to configure script])
AC_SUBST(CONFIG_FLAGS)
AC_CONFIG_AUX_DIR([.])
AC_CONFIG_SRCDIR(server/upsd.c)
AC_CONFIG_MACRO_DIR([m4])
AS_IF([test x"${NUT_SOURCE_GITREV}" = x],
[echo "Network UPS Tools version ${PACKAGE_VERSION}"],
[echo "Network UPS Tools version ${PACKAGE_VERSION} (${NUT_SOURCE_GITREV})"])
AC_CANONICAL_TARGET
NUT_CHECK_OS
NUT_STASH_WARNINGS
AC_CONFIG_HEADERS([include/config.h])
AC_PREFIX_DEFAULT(/usr/local/ups)
AM_INIT_AUTOMAKE([subdir-objects])
dnl Default to `configure --enable-silent-rules` or `make V=1` for details?
dnl This feature seems to require automake-1.13 or newer (1.11+ by other info)
dnl On very old systems can comment it away with little loss (then automake-1.10
dnl is known to suffice):
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])],
[AC_MSG_NOTICE([Silent Rules feature not defined in this automake version, skipped])])
dnl we need Autoconf 2.61 or better to enable features of Posix that are extensions to C
dnl (and actually 2.64 or better for m4/ax_check_compile_flag.m4 when it is sourced)
dnl UPDATE: As tested on CentOS 6, its "autoconf-2.63-5.1.el6.noarch" also suffices.
dnl But OpenBSD 6.5 requires autoconf-2.65 and automake-1.13 or newer...
AC_MSG_CHECKING(for autoconf macro to enable system extensions)
m4_version_prereq(2.61, [
AC_MSG_RESULT(yes)
AC_USE_SYSTEM_EXTENSIONS
], [
AC_MSG_RESULT(no)
])
AC_PREREQ([2.63])
dnl #AC_PREREQ([2.64])
dnl Use "./configure --enable-maintainer-mode" to keep Makefile.in and Makefile
dnl in sync after Git updates.
AM_MAINTAINER_MODE
dnl Some systems have older autotools without direct macro support for PKG_CONF*
NUT_CHECK_PKGCONFIG
dnl Various version related processing
dnl ----------------------------------
dnl # the following is commented out, because the UPS_VERSION macro now
dnl # resides in include/nut_version.h, which is generated by Makefile.am,
dnl # rather than in include/config.h, which is generated by configure. The
dnl # reason is that the SVN revision should be computed at compile time,
dnl # not configure time.
dnl AC_DEFINE_UNQUOTED(UPS_VERSION, "${PACKAGE_VERSION}", [NUT version])
dnl However, automatically define the tree version (mostly for AC_SUBST)
TREE_VERSION="`echo ${PACKAGE_VERSION} | awk '{ print substr($0,1,3) }'`"
AC_DEFINE_UNQUOTED(TREE_VERSION, "${TREE_VERSION}", [NUT tree version])
dnl Should not be necessary, since old servers have well-defined errors for
dnl unsupported commands:
NUT_NETVERSION="1.3"
AC_DEFINE_UNQUOTED(NUT_NETVERSION, "${NUT_NETVERSION}", [NUT network protocol version])
dnl Fix this early so we can expand with eval later
test "${prefix}" = "NONE" && prefix="${ac_default_prefix}"
test "${exec_prefix}" = "NONE" && exec_prefix='${prefix}'
CFLAGS=${CFLAGS-"-O"}
dnl Note: for practical and platform-independent use, see AX_REALPATH macro
AC_CHECK_PROGS([REALPATH], [realpath], [])
dnl FIXME: remove after dev-testing
dnl UNITTEST_AX_REALPATH
dnl exit
dnl NOTE: for definition of NUT_* autoconf macros, see m4/ directory
dnl and docs/macros.txt
dnl +------------------------------------------------------------------+
dnl | default values for things later on (can be overridden) |
STATEPATH="/var/state/ups"
dnl Historically this refers to *system location* for PID files,
dnl and more specifically that for `upsmon` (running as `root`).
dnl See also ALTPIDPATH (defaulted to STATEPATH) setting below
dnl for the unprivileged daemons (`upsd`, drivers).
PIDPATH="/var/run"
dnl Honour new LFS recommendations if applied on the build system:
AS_IF([test -d "/run"], [PIDPATH="/run"])
dnl Defaults for respective configure options below
dnl Note these defaults may change further below depending on OS and
dnl certain other configure options (e.g. "in-place replacement")
RUN_AS_USER="nobody"
RUN_AS_GROUP="nobody"
AS_IF([test -n "`getent group nogroup`" && ! test -n "`getent group "${RUN_AS_GROUP}"`"],
[RUN_AS_GROUP="nogroup"]
)
dnl NOTE: NUT legacy default, keep as is for least surprise
dnl Distributions are however welcome to specify the option to use tmpfs
AS_CASE([${target_os}],
[*mingw*], [POWERDOWNFLAG="C:\\\\killpower"], dnl NOTE: Double backslashes (times escaping) are correct!
[POWERDOWNFLAG="/etc/killpower"] dnl POSIX systems default
)
cgiexecdir='${exec_prefix}/cgi-bin'
driverexecdir='${exec_prefix}/bin'
htmldir='${prefix}/html'
pkgconfigdir='${libdir}/pkgconfig'
auglensdir='/usr/share/augeas/lenses/dist'
if test ! -d "${auglensdir}"; then
auglensdir='/usr/share/augeas/lenses'
if test ! -d "${auglensdir}"; then
auglensdir=''
fi
fi
dnl ### NUT_CHECK_LIBREGEX ### Detect below as part of libusb etc.
dnl ### LIBREGEX_LIBS=''
dnl Disable Hotplug, DevD and udev support on Windows
dnl (useful when cross-compiling)
case "${target_os}" in
*mingw* )
dnl TODO: Actually detect it? See also nut_check_libregex.m4 for same.
dnl Here we assumed from practice that it is available...
dnl ### if test x"${LIBREGEX_LIBS}" = x ; then
dnl ### LIBREGEX_LIBS='-lregex'
dnl ### fi
hotplugdir=''
udevdir=''
devddir=''
;;
* )
hotplugdir='/etc/hotplug'
if test ! -d "${hotplugdir}"; then
hotplugdir=''
fi
udevdir='/lib/udev'
if test ! -d "${udevdir}"; then
udevdir='/etc/udev'
if test ! -d "${udevdir}"; then
udevdir=''
fi
fi
devddir='/usr/local/etc/devd'
if test ! -d "${devddir}"; then
devddir='/etc/devd'
if test ! -d "${devddir}"; then
devddir=''
fi
fi
;;
esac
dnl Note: this deals with run-time settings so that the newly built
dnl programs can be "just executed" to use same configuration files
dnl and filesystem object permissions as an older deployment of NUT
dnl on this system; this specifically does not deal with trying to
dnl use same prefix and other paths to fully replace an older setup
dnl (a different option might be crafted to do that, but really the
dnl arcane distro-dependent packaging recipes are a better way here).
dnl This feature is intended for users who want to see if a custom
dnl build of NUT supports their hardware or other use-cases better.
NUT_ARG_ENABLE([inplace-runtime],
[Request configure option defaults for runtime user/group/confpath based on currently installed NUT (to extent these can be detected)],
[no])
dnl Check for not re-entering in this run - whether NUT_VERSION_DEPLOYED is set
AS_IF([test x"$nut_enable_inplace_runtime" = xyes -a x"${NUT_VERSION_DEPLOYED-}" = x], [
AC_MSG_NOTICE([checking for location, CONFIG_FLAGS and version of an already deployed NUT build (if it reports those)])
dnl If existing NUT installation reports its build options, re-run this
dnl script with those flags (overridden by any options passed currently):
conftemp="${sbindir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
PREFIX_SBINDIR="${conftemp}"
conftemp="${bindir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
PREFIX_BINDIR="${conftemp}"
DEPLOYED_SBINDIR="${PREFIX_SBINDIR}"
DEPLOYED_BINDIR="${PREFIX_BINDIR}"
dnl Note use of AC_PATH_PROG for specific pathname (not AC_CHECK_PROGS which picks filename variants)!
dnl Note: "ordinary" users might not have "sbin" in their default PATH, so appending it:
dnl Note: in some systems, the file in PATH is a shell
dnl wrapper for /etc/nut/nut.conf MODE support
AC_PATH_PROG([DEPLOYED_UPSD], [upsd], [], [${PREFIX_SBINDIR}:${PATH}:/sbin:/usr/sbin:/usr/local/sbin])
dnl ...however "upsc" is a userland tool so should be there:
AC_PATH_PROG([DEPLOYED_UPSC], [upsc], [], [${PREFIX_BINDIR}:${PATH}])
AS_IF([test -x "${DEPLOYED_UPSD}"], [
AX_REALPATH([$DEPLOYED_UPSD], [DEPLOYED_UPSD])
DEPLOYED_SBINDIR="`dirname "${DEPLOYED_UPSD}"`"
])
AS_IF([test -x "${DEPLOYED_UPSC}"], [
AX_REALPATH([$DEPLOYED_UPSC], [DEPLOYED_UPSC])
DEPLOYED_BINDIR="`dirname "${DEPLOYED_UPSC}"`"
])
DEPLOYED_PREFIX=""
AS_IF([test -d "${DEPLOYED_SBINDIR}"],
[DEPLOYED_PREFIX="`dirname "${DEPLOYED_SBINDIR}"`"],
[AS_IF([test -d "${DEPLOYED_BINDIR}"],
[DEPLOYED_PREFIX="`dirname "${DEPLOYED_BINDIR}"`"])]
)
AC_MSG_CHECKING([for CONFIG_FLAGS of an already deployed NUT build (if it reports those)])
CONFIG_FLAGS_DEPLOYED=""
NUT_VERSION_DEPLOYED=""
dnl TODO: Similar query can be done for BINDIR tools
dnl and for libupsclient-config if deployed locally
for DEPLOYED_TOOL in \
"${DEPLOYED_UPSD}" \
"${DEPLOYED_UPSC}" \
; do
AS_IF([test x"${DEPLOYED_TOOL}" = x], [continue])
AS_IF([test -x "${DEPLOYED_TOOL}"], [], [continue])
AC_MSG_CHECKING([for CONFIG_FLAGS from ${DEPLOYED_TOOL}])
CONFIG_FLAGS_DEPLOYED="`"${DEPLOYED_TOOL}" -DV 2>&1 | grep 'configured with flags:' | head -1 | sed 's,^.*configured with flags: *,,'`" \
&& test x"${CONFIG_FLAGS_DEPLOYED}" != x \
|| CONFIG_FLAGS_DEPLOYED=""
NUT_VERSION_DEPLOYED="`"${DEPLOYED_TOOL}" -DV 2>&1 | grep 'configured with flags:' | head -1 | sed 's,^.*Network UPS Tools version \(.*\) configured with flags:.*$,\1,'`" \
&& test x"${NUT_VERSION_DEPLOYED}" != x \
|| NUT_VERSION_DEPLOYED=""
AS_IF([test x"${CONFIG_FLAGS_DEPLOYED}${NUT_VERSION_DEPLOYED}" = x], [], [break])
done
AS_IF([test x"${CONFIG_FLAGS_DEPLOYED}" != x], [
AC_MSG_RESULT([CONFIG_FLAGS_DEPLOYED: ${CONFIG_FLAGS_DEPLOYED}])
],[
AC_MSG_RESULT([CONFIG_FLAGS_DEPLOYED: not reported])
])
dnl Account for custom paths if known/found:
AS_IF([test x"${DEPLOYED_PREFIX}" != x && test x"${DEPLOYED_PREFIX}" != x"${prefix}"],
AC_MSG_WARN([Deployed NUT installation uses a PREFIX different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_PREFIX}' vs. '${prefix}'])
[AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
[*--prefix=*], [],
[CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --prefix='${DEPLOYED_PREFIX}'"])
])
AS_IF([test x"${DEPLOYED_SBINDIR}" != x && test x"${DEPLOYED_SBINDIR}" != x"${PREFIX_SBINDIR}"],
AC_MSG_WARN([Deployed NUT installation uses a SBINDIR different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_SBINDIR}' vs. '${sbindir}'])
[AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
[*--sbindir=*], [],
[CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --sbindir='${DEPLOYED_SBINDIR}'"])
])
AS_IF([test x"${DEPLOYED_BINDIR}" != x && test x"${DEPLOYED_BINDIR}" != x"${PREFIX_BINDIR}"],
AC_MSG_WARN([Deployed NUT installation uses a BINDIR different from one specified (wins) or derived (loses) for this build: '${DEPLOYED_BINDIR}' vs. '${bindir}'])
[AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
[*--bindir=*], [],
[CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --bindir='${DEPLOYED_BINDIR}'"])
])
AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
[*--sysconfdir=*], [
for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
case "$F" in
"--sysconfdir="*) sysconfdir="`echo "$F" | ( IFS='=' read K V ; echo "$V" )`" ;;
esac
done
],
[
dnl If there was no custom --sysconfdir=/etc/myNUT passed,
dnl try to default it to something from existing deployment.
dnl NOTE: Single-quotes are correct for autotools default,
dnl expanded at runtime (see conftemp tricks below)
AC_MSG_CHECKING([for in-place replacement default sysconfdir (better than '${sysconfdir}')])
DEPLOYED_SYSCONFDIR=""
dnl TODO: Any more reasonable defaults? Pile them on here :)
for D in \
/etc/nut /etc/ups \
/usr/etc/nut /usr/etc/ups \
/usr/local/etc/nut /usr/local/etc/ups \
/usr/local/nut/etc /usr/local/ups/etc \
; do
if test -e "$D/ups.conf" || test -e "$D/upsmon.conf" \
|| ( test -e "$D/upsd.conf" && test -e "$D/upsd.users" ) \
; then
DEPLOYED_SYSCONFDIR="$D"
break
else
if test -d "$D/" && test ! -r "$D/" ; then
dnl Keeping order of preference defined by "for" loop:
AC_MSG_WARN([Picking directory '${D}' which exists but current build user may not read])
DEPLOYED_SYSCONFDIR="$D"
break
fi
fi
done
AS_IF([test -n "${DEPLOYED_SYSCONFDIR}"], [
AC_MSG_RESULT([${DEPLOYED_SYSCONFDIR}])
dnl May be used in searches below:
sysconfdir="${DEPLOYED_SYSCONFDIR}"
CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --sysconfdir='${DEPLOYED_SYSCONFDIR}'"
], [
AC_MSG_RESULT([not detected])
])
])
dnl Prepare paths that may be used in user/group searches below:
conftemp="${sysconfdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
CONFPATH="${conftemp}"
AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
[*--libdir=*], [
for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
case "$F" in
"--libdir="*) libdir="`echo "$F" | ( IFS='=' read K V ; echo "$V" )`" ;;
esac
done
]
)
conftemp="${libdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
LIBDIR="${conftemp}"
AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
[*--with-pkgconfig-dir=*], [
for F in ${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS} ; do
case "$F" in
"--with-pkgconfig-dir="*) pkgconfigdir="`echo "$F" | ( IFS='=' read K V ; echo "$V" )`" ;;
esac
done
]
)
dnl pkgconfigdir may have more indirections:
conftemp="${pkgconfigdir}"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
eval conftemp=\"${conftemp}\"
PKGCONFIGDIR="${conftemp}"
AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
[*--with-group=*], [],
[
AC_MSG_CHECKING([for in-place replacement default group (better than '${RUN_AS_GROUP}')])
nut_inplace_group=""
AS_IF([test -d "${udevdir}/rules.d"],
[for F in "${udevdir}/rules.d"/*-nut-*.rules ; do
if test -s "$F" ; then
nut_inplace_group="`grep GROUP= "$F" | head -1 | sed 's,^.* GROUP="*\(.*\)"*.*$,\1,'`" \
&& test -n "`getent group "${nut_inplace_group}"`" \
&& AC_MSG_RESULT([Got from ${F}]) \
&& break \
|| nut_inplace_group=""
fi
done
])
AS_IF([test -z "${nut_inplace_group}"],
[AS_IF([test -n "`getent group nut`"], [nut_inplace_group="nut"],
[AS_IF([test -n "`getent group ups`"], [nut_inplace_group="ups"])])])
AS_IF([test -n "${nut_inplace_group}"], [
AC_MSG_RESULT([${nut_inplace_group}])
CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --with-group='${nut_inplace_group}'"
], [
AC_MSG_RESULT([not detected])
])
])
AS_CASE(["${CONFIG_FLAGS_DEPLOYED} ${CONFIG_FLAGS}"],
[*--with-user=*], [],
[
AC_MSG_CHECKING([for in-place replacement default user (better than '${RUN_AS_USER}')])
nut_inplace_user=""
dnl Beside currently active setting, check the built-in default sugestion
AS_IF([test -s "${CONFPATH}/upsmon.conf"],
[for nut_inplace_user in \
`grep -E '^ *RUN_AS_USER' "${CONFPATH}/upsmon.conf" | awk '{print $2}'`\
`grep -E '^ *##*RUN_AS_USER' "${CONFPATH}/upsmon.conf" | awk '{print $2}'`\
`grep -E '^ *##* *RUN_AS_USER' "${CONFPATH}/upsmon.conf" | awk '{print $3}'`\
; do \
AS_IF([test -z "${nut_inplace_user}"], [
test -n "`getent passwd "${nut_inplace_user}"`" \
&& AC_MSG_RESULT([Got from ${CONFPATH}/upsmon.conf]) \
|| nut_inplace_user=""])
done
])
AS_IF([test -s "${CONFPATH}/upsmon.conf.sample" && test -z "${nut_inplace_user}"],
[for nut_inplace_user in \
`grep -E '^ *RUN_AS_USER' "${CONFPATH}/upsmon.conf.sample" | awk '{print $2}'`\
`grep -E '^ *##*RUN_AS_USER' "${CONFPATH}/upsmon.conf.sample" | awk '{print $2}'`\
`grep -E '^ *##* *RUN_AS_USER' "${CONFPATH}/upsmon.conf.sample" | awk '{print $3}'`\
; do \
AS_IF([test -z "${nut_inplace_user}"], [
test -n "`getent passwd "${nut_inplace_user}"`" \
&& AC_MSG_RESULT([Got from ${CONFPATH}/upsmon.conf]) \
|| nut_inplace_user=""])
done
])
dnl Note: with default short inplace and no prefix, this would look under
dnl /usr/local/ups/lib/pkgconfig which may be irrelevant for packaged setups
dnl TODO: Any more reasonable defaults? Pile them on here :)
for F in \
"${PKGCONFDIR}/libupsclient.pc" \
"${PKGCONFDIR}/libnutclient.pc" \
"${LIBDIR}/pkgconfig/libupsclient.pc" \
"${LIBDIR}/pkgconfig/libnutclient.pc" \
; do
AS_IF([test -z "${nut_inplace_user}" && test -s "$F"],
[nut_inplace_user="`grep -E '^ *nutuser=' "$F" | sed 's,^ *nutuser=,,'`" \
&& test -n "`getent passwd "${nut_inplace_user}"`" \
&& AC_MSG_RESULT([Got from $F]) \
|| nut_inplace_user=""
])
done
AS_IF([test -z "${nut_inplace_user}"],
[AS_IF([test -n "`getent passwd nut`"], [nut_inplace_user="nut"],
[AS_IF([test -n "`getent passwd ups`"], [nut_inplace_user="ups"])])])
AS_IF([test -n "${nut_inplace_user}"], [
AC_MSG_RESULT([${nut_inplace_user}])
CONFIG_FLAGS_DEPLOYED="${CONFIG_FLAGS_DEPLOYED} --with-user='${nut_inplace_user}'"
], [
AC_MSG_RESULT([not detected])
])
])
AS_IF([test x"${CONFIG_FLAGS_DEPLOYED}" != x], [
AC_MSG_NOTICE([Detected CONFIG_FLAGS of an already deployed NUT installation, using them for --inplace-runtime configuration (restarting script)])
dnl For multiply-specified flags with conflicting values, last mention wins:
AC_MSG_NOTICE([exec "$0" $CONFIG_FLAGS_DEPLOYED $CONFIG_FLAGS --disable-inplace-runtime])
AS_IF([test x"${NUT_VERSION_DEPLOYED}" != x], [
AC_MSG_NOTICE([NUT_VERSION_DEPLOYED: ${NUT_VERSION_DEPLOYED}])
],[
NUT_VERSION_DEPLOYED="<reenter>"
])
export NUT_VERSION_DEPLOYED
eval exec "$0" $CONFIG_FLAGS_DEPLOYED $CONFIG_FLAGS --disable-inplace-runtime
],[
AC_MSG_NOTICE([No CONFIG_FLAGS were reported or discovered from existing NUT deployment (if any); restarting script for a clean run])
NUT_VERSION_DEPLOYED="<reenter>"
export NUT_VERSION_DEPLOYED
AC_MSG_NOTICE([exec "$0" $CONFIG_FLAGS --disable-inplace-runtime])
eval exec "$0" $CONFIG_FLAGS --disable-inplace-runtime
])
])
dnl Define directory where LIBOBJS replacement functions are
AC_CONFIG_LIBOBJ_DIR([common])
dnl +-------------------------------------------------------------------
dnl AC_PROG_CC
dnl Macro AC_PROG_CC_C99 is obsolete; use AC_PROG_CC
dnl Note that NUT does not support building with C89 anyway
dnl AC_PROG_CC_C99
dnl Needed for per-target flags
AM_PROG_CC_C_O
AC_PROG_CPP
AC_PROG_CXX
AC_PROG_CXX_C_O
AC_PROG_INSTALL
AC_PROG_MKDIR_P
AC_PROG_LN_S
AC_PROG_EGREP
AC_PATH_PROG(AR, ar)
AC_CHECK_TOOL(RANLIB, ranlib, :)
dnl Postpone call to LT_INIT/AC_CONFIG_FILES to allow disabling static lib
AC_C_BIGENDIAN
AC_C_INLINE
AC_C_FLEXIBLE_ARRAY_MEMBER
AC_C_VARARRAYS
NUT_ARG_ENABLE([keep_nut_report_feature],
[Request that we keep config.nut_report_feature.log (normally deleted by configure script after displaying)],
[no])
AS_IF([test x"${NUT_SOURCE_GITREV}" = x],
[NUT_REPORT([configured version], [${PACKAGE_VERSION}])],
[NUT_REPORT([configured version], [${PACKAGE_VERSION} (${NUT_SOURCE_GITREV})])])
dnl Note: the compiler/pragma/attr methods below are custom for NUT codebase:
NUT_COMPILER_FAMILY
dnl Note: DO NOT AC_DEFINE the "FULL" items: they are generally multi-line.
dnl NUT_REPORT_TARGET([CC_VERSION_FULL], ["${CC_VERSION_FULL}"], [Version and other details of C compiler])
dnl NUT_REPORT_TARGET([CXX_VERSION_FULL], ["${CXX_VERSION_FULL}"], [Version and other details of C++ compiler])
dnl NUT_REPORT_TARGET([CPP_VERSION_FULL], ["${CPP_VERSION_FULL}"], [Version and other details of C preprocessor])
NUT_REPORT_TARGET([CC_VERSION], ["${CC_VERSION}"], [Compact version of C compiler])
NUT_REPORT_TARGET([CXX_VERSION], ["${CXX_VERSION}"], [Compact version of C++ compiler])
NUT_REPORT_TARGET([CPP_VERSION], ["${CPP_VERSION}"], [Compact version of C preprocessor])
dnl Help find warning/error details in a wall of text (must be processed before NUT_COMPILER_FAMILY_FLAGS):
NUT_ARG_ENABLE([Wcolor],
[Request that compiler output is colorized (no = leave it up to compiler defaults)],
[no])
NUT_COMPILER_FAMILY_FLAGS
AX_C_PRAGMAS
AX_C___ATTRIBUTE__
AX_C_PRINTF_STRING_NULL
dnl All current systems provide time.h; it need not be checked for.
dnl Not all systems provide sys/time.h, but those that do, all allow
dnl you to include it and time.h simultaneously.
dnl NUT codebase provides the include/timehead.h to wrap these nuances.
AC_CHECK_HEADERS_ONCE([sys/time.h time.h sys/types.h sys/socket.h netdb.h])
dnl ###obsolete### AC_HEADER_TIME
AS_IF([test "$ac_cv_header_sys_time_h" = yes],
[AC_DEFINE([TIME_WITH_SYS_TIME],[1],[Define to 1 if you can safely include both <sys/time.h>
and <time.h>. This macro is deemed obsolete by autotools.])
], [])
AC_CHECK_FUNCS(flock lockf fcvt fcvtl dup dup2 abs_val abs)
AC_CHECK_HEADER([float.h],
[AC_DEFINE([HAVE_FLOAT_H], [1],
[Define to 1 if you have <float.h>.])])
AC_CHECK_HEADER([math.h],
[AC_DEFINE([HAVE_MATH_H], [1],
[Define to 1 if you have <math.h>.])])
AC_CHECK_DECLS([fabs, fabsf, fabsl, pow10, round], [], [],
[#ifdef HAVE_MATH_H
# include <math.h>
#endif
#ifdef HAVE_FLOAT_H
# include <float.h>
#endif
])
AC_CHECK_HEADER([limits.h],
[AC_DEFINE([HAVE_LIMITS_H], [1],
[Define to 1 if you have <limits.h>.])])
AC_CHECK_HEADER([stdlib.h],
[AC_DEFINE([HAVE_STDLIB_H], [1],
[Define to 1 if you have <stdlib.h>.])])
AC_CHECK_DECLS(realpath, [], [],
[#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
])
AC_CHECK_HEADER([signal.h],
[AC_DEFINE([HAVE_SIGNAL_H], [1],
[Define to 1 if you have <signal.h>.])])
AC_CHECK_HEADER([sys/signal.h],
[AC_DEFINE([HAVE_SYS_SIGNAL_H], [1],
[Define to 1 if you have <sys/signal.h>.])])
AC_CHECK_HEADER([sys/resource.h],
[AC_MSG_CHECKING([for struct rlimit and getrlimit()])
AC_LANG_PUSH([C])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#include <sys/resource.h>
],
[struct rlimit limit;
getrlimit(RLIMIT_NOFILE, &limit);
/* Do not care about actual return value in this test,
* normally check for non-zero meaning to look in errno */
]
)],
[AC_DEFINE([HAVE_SYS_RESOURCE_H], [1],
[Define to 1 if you have <sys/resource.h> with usable struct rlimit and getrlimit().])
AC_MSG_RESULT([ok])
],
[AC_MSG_RESULT([no])]
)
AC_LANG_POP([C])
]
)
AC_CHECK_HEADER([poll.h],
[AC_DEFINE([HAVE_POLL_H], [1],
[Define to 1 if you have <poll.h>.])])
SEMLIBS=""
AC_CHECK_HEADER([semaphore.h],
[AC_DEFINE([HAVE_SEMAPHORE_H], [1],
[Define to 1 if you have <sys/semaphore.h>.])
AC_MSG_CHECKING([for sem_t, sem_init() and sem_destroy()])
AC_LANG_PUSH([C])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#include <semaphore.h>
],
[sem_t semaphore;
sem_init(&semaphore, 0, 4);
sem_destroy(&semaphore);
/* Do not care about actual return value in this test,
* normally check for non-zero meaning to look in errno */
]
)],
[AC_DEFINE([HAVE_SEMAPHORE], [1],
[Define to 1 if you have <sys/semaphore.h> with usable sem_t sem_init() and sem_destroy().])
AC_MSG_RESULT([ok])
dnl Solaris 8 builds complain about indirect dependency involved:
dnl sem_init nut_scanner-nut-scanner.o
dnl (symbol belongs to implicit dependency /usr/lib/librt.so.1)
AC_CHECK_LIB(rt, sem_init, SEMLIBS="-lrt")
],
[AC_MSG_RESULT([no])]
)
AC_LANG_POP([C])
]
)
AM_CONDITIONAL(HAVE_SEMAPHORE_LIBS, test -n "${SEMLIBS}")
AC_CHECK_FUNCS(cfsetispeed tcsendbreak)
AC_CHECK_FUNCS(seteuid setsid getpassphrase)
AC_CHECK_FUNCS(on_exit setlogmask)
AC_CHECK_DECLS(LOG_UPTO, [], [], [#include <syslog.h>])
dnl These common routines are not available in strict C standard library
dnl compilation modes (not part of ANSI or later standard), only in GNU,
dnl POSIX or other extension modes. Note that on modern systems they are
dnl available, just hidden in headers - so AC_CHECK_FUNCS() finds them
dnl by adding a declaration, while the "real" codebase can't use them.
AC_MSG_NOTICE(
[-----------------------------------------------------------------------
The next few tests look for required C library routines; if something is
not found, you may need to enable a different C standard or extension macro
version. You may also have to configure without extreme warning levels
since autotools tests fail those on their own and assume system lacks
stuff (although note we try to not involve standard -W* flags here).
-----------------------------------------------------------------------])
dnl# AC_CHECK_FUNCS(strcasecmp strncasecmp,
dnl# [], [AC_MSG_WARN([Required C library routine not found; try adding __EXTENSIONS__])])
dnl These appear with CFLAGS="-std=c99 -D_POSIX_C_SOURCE=200112L":
dnl# Methods below currently do not cause build errors for C99+ modes so are
dnl# not tested as thoroughly as those further below:
AC_CHECK_FUNCS(strtok_r fileno localtime_r localtime_s gmtime_r gmtime_s sigemptyset sigaction,
[], [AC_MSG_WARN([Required C library routine not found; try adding -D_POSIX_C_SOURCE=200112L])])
AC_LANG_PUSH([C])
AC_CHECK_HEADER([string.h],
[AC_DEFINE([HAVE_STRING_H], [1],
[Define to 1 if you have <string.h>.])])
AC_CHECK_HEADER([strings.h],
[AC_DEFINE([HAVE_STRINGS_H], [1],
[Define to 1 if you have <strings.h>.])])
CODE_STRINGINCL='#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif'
AC_CACHE_CHECK([for strcasecmp(s1,s2)],
[ac_cv_func_strcasecmp],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL],
[if (strcasecmp("STR1", "str1") != 0) return 1])],
[ac_cv_func_strcasecmp=yes], [ac_cv_func_strcasecmp=no]
)])
AS_IF([test x"${ac_cv_func_strcasecmp}" = xyes],
[AC_DEFINE([HAVE_STRCASECMP], 1, [defined if standard library has, and C standard allows, the strcasecmp(s1,s2) method])],
[AC_MSG_WARN([Required C library routine strcasecmp not found; try adding __EXTENSIONS__])]
)
AC_CACHE_CHECK([for strncasecmp(s1,s2,n)],
[ac_cv_func_strncasecmp],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL],
[if (strncasecmp("STR1", "strX", 2) != 0) return 1])],
[ac_cv_func_strncasecmp=yes], [ac_cv_func_strncasecmp=no]
)])
AS_IF([test x"${ac_cv_func_strncasecmp}" = xyes],
[AC_DEFINE([HAVE_STRNCASECMP], 1, [defined if standard library has, and C standard allows, the strncasecmp(s1,s2,n) method])],
[AC_MSG_WARN([Required C library routine strncasecmp not found; try adding __EXTENSIONS__])]
)
dnl Note: this changes the original string in argument!
dnl Do not pass it constants (strdup them if needed)!
AC_CACHE_CHECK([for strlwr(s)],
[ac_cv_func_strlwr],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL],
[char s@<:@64@:>@ = {"Some STR1 text"} ; if (strlwr(s) == NULL) return 1])],
[ac_cv_func_strlwr=yes], [ac_cv_func_strlwr=no]
)])
AS_IF([test x"${ac_cv_func_strlwr}" = xyes],
[AC_DEFINE([HAVE_STRLWR], 1, [defined if standard library has, and C standard allows, the strlwr(s1,s2) method])],
[AC_MSG_WARN([Optional C library routine strlwr not found])]
)
AC_CACHE_CHECK([for strsep(s1,s2)],
[ac_cv_func_strsep],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL],
[char arr@<:@64@:>@ = {"Some,tuple,text"} ; char *s = arr; if (strsep(&s, ",") == NULL) return 1])],
[ac_cv_func_strsep=yes], [ac_cv_func_strsep=no]
)])
AS_IF([test x"${ac_cv_func_strsep}" = xyes],
[AC_DEFINE([HAVE_STRSEP], 1, [defined if standard library has, and C standard allows, the strsep(s1,s2) method])],
[AC_MSG_WARN([Optional C library routine strsep not found])]
)
AM_CONDITIONAL([HAVE_STRSEP], [test x"${ac_cv_func_strsep}" = "xyes"])
AC_CACHE_CHECK([for strstr(s1,s2)],
[ac_cv_func_strstr],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL],
[if (strstr("Some str1 text", "str1") == NULL) return 1])],
[ac_cv_func_strstr=yes], [ac_cv_func_strstr=no]
)])
AS_IF([test x"${ac_cv_func_strstr}" = xyes],
[AC_DEFINE([HAVE_STRSTR], 1, [defined if standard library has, and C standard allows, the strstr(s1,s2) method])],
[AC_MSG_ERROR([Required C library routine strstr not found])]
)
AC_CACHE_CHECK([for strcasestr(s1,s2)],
[ac_cv_func_strcasestr],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL],
[if (strcasestr("Some STR1 text", "str1") == NULL) return 1])],
[ac_cv_func_strcasestr=yes], [ac_cv_func_strcasestr=no]
)])
AS_IF([test x"${ac_cv_func_strcasestr}" = xyes],
[AC_DEFINE([HAVE_STRCASESTR], 1, [defined if standard library has, and C standard allows, the strcasestr(s1,s2) method])],
[AS_IF([test x"${ac_cv_func_strlwr}" = xyes && test x"${ac_cv_func_strstr}" = xyes],
[AC_MSG_WARN([Optional C library routine strcasestr not found; a simple wrapper will be built in])]
[AC_MSG_WARN([Required C library routine strcasestr not found; try adding _GNU_SOURCE])]
)])
AC_CACHE_CHECK([for strptime(s1,s2,tm)],
[ac_cv_func_strptime],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
],
[struct tm tm;
char *date = "12/30/1999";
char *p = strptime(date, "%m/%d/%Y", &tm);
if (p == NULL || *p != '\0') return 1])],
[ac_cv_func_strptime=yes], [ac_cv_func_strptime=no]
)])
AS_IF([test x"${ac_cv_func_strptime}" = xyes],
[AC_DEFINE([HAVE_STRPTIME], 1, [defined if standard library has, and C standard allows, the strptime(s1,s2,tm) method])],
[AC_MSG_WARN([Optional C library routine strptime not found; try adding _GNU_SOURCE; a fallback implementation will be built in])]
)
dnl Note: per Linux headers, this may need __USE_XOPEN (features.h)
dnl which is enabled by _XOPEN_SOURCE via _GNU_SOURCE on the platform.
AM_CONDITIONAL([HAVE_STRPTIME], [test x"${ac_cv_func_strptime}" = "xyes"])
AC_CACHE_CHECK([for clock_gettime(CLOCK_MONOTONIC,ts)],
[ac_cv_func_clock_gettime],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
],
[struct timespec monoclock_ts;
int got_monoclock = clock_gettime(CLOCK_MONOTONIC, &monoclock_ts);
if (monoclock_ts.tv_sec < 0 || monoclock_ts.tv_nsec < 0) return 1])],
[ac_cv_func_clock_gettime=yes], [ac_cv_func_clock_gettime=no]
)])
AS_IF([test x"${ac_cv_func_clock_gettime}" = xyes],
[AC_DEFINE([HAVE_CLOCK_GETTIME], 1, [defined if standard library has, and C standard allows, the clock_gettime(clkid,ts) method])
AC_DEFINE([HAVE_CLOCK_MONOTONIC], 1, [defined if standard library has, and C standard allows, the CLOCK_MONOTONIC macro or token])],
[AC_MSG_WARN([Optional C library routine clock_gettime not found; will not be used in notifications])]
)
dnl Currently these two are the same for us; note also fallback support for
dnl older autoconf in SYSTEMD_SUPPORTS_DAEMON_TYPE_NOTIFY_RELOAD way below:
AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test x"${ac_cv_func_clock_gettime}" = "xyes"])
AM_CONDITIONAL([HAVE_CLOCK_MONOTONIC], [test x"${ac_cv_func_clock_gettime}" = "xyes"])
AC_CACHE_CHECK([for strnlen(s1,s2,tm)],
[ac_cv_func_strnlen],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL
#include <stdlib.h>
],
[size_t len = strnlen("LongString", 5);
if (len != 5) return 5;
len = strnlen("LongString", 50);
if (len != 10) return 10
])],
[ac_cv_func_strnlen=yes], [ac_cv_func_strnlen=no]
)])
AS_IF([test x"${ac_cv_func_strnlen}" = xyes],
[AC_DEFINE([HAVE_STRNLEN], 1, [defined if standard library has, and C standard allows, the strnlen(s1,s2) method])],
[AC_MSG_WARN([Optional C library routine strnlen not found; a fallback implementation will be built in])]
)
AM_CONDITIONAL([HAVE_STRNLEN], [test x"${ac_cv_func_strnlen}" = "xyes"])
AC_CACHE_CHECK([for strdup(s)],
[ac_cv_func_strdup],
[AX_RUN_OR_LINK_IFELSE(
[AC_LANG_PROGRAM([$CODE_STRINGINCL
#include <stdlib.h>
],
[[int res = 0;
char *t = "Test";
char *s = strdup(t);
if (!s || !(s[0]=='T'&&s[1]=='e'&&s[2]=='s'&&s[3]=='t'&&s[4]=='\0') || s == t) res = 1;
if (s) free (s);
if (res != 0) return res
/* autoconf adds ";return 0;" */
]])],
[ac_cv_func_strdup=yes], [ac_cv_func_strdup=no]
)])
AS_IF([test x"${ac_cv_func_strdup}" = xyes],
[AC_DEFINE([HAVE_STRDUP], 1, [defined if standard library has, and C standard allows, the strdup(s) method])],
[AC_MSG_WARN([Required C library routine strdup not found; try adding -D_POSIX_C_SOURCE=200112L])]
)
AC_CHECK_HEADER([sys/select.h],
[AC_DEFINE([HAVE_SYS_SELECT_H], [1],
[Define to 1 if you have <sys/select.h>.])])
AC_CACHE_CHECK([for suseconds_t],
[ac_cv_type_suseconds_t],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <sys/types.h>
#if HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
]],
[[suseconds_t us = 1000000;
signed long int l = 1000000;
if (l != (signed long int)us) return 1;
l = -1; us = -1;
if (l != (signed long int)us) return 1
/* autoconf adds ";return 0;" */
/* we hope the code above fails if type is not defined or range is not sufficient */
]])],
[ac_cv_type_suseconds_t=yes], [ac_cv_type_suseconds_t=no]
)])
AS_IF([test x"${ac_cv_type_suseconds_t}" = xyes],
[AC_DEFINE([HAVE_SUSECONDS_T], 1, [defined if standard library has, and C standard allows, the suseconds_t type])],
[AC_MSG_WARN([Required C library type suseconds_t not found; try adding -D_POSIX_C_SOURCE=200112L])]
)
AC_CACHE_CHECK([for useconds_t],
[ac_cv_type_useconds_t],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <unistd.h>
]],
[[useconds_t us = 1000000;
unsigned long int l = 1000000;
if (l != (unsigned long int)us) return 1
/* autoconf adds ";return 0;" */
/* we hope the code above fails if type is not defined or range is not sufficient */
]])],
[ac_cv_type_useconds_t=yes], [ac_cv_type_useconds_t=no]
)])
AS_IF([test x"${ac_cv_type_useconds_t}" = xyes],
[AC_DEFINE([HAVE_USECONDS_T], 1, [defined if standard library has, and C standard allows, the useconds_t type])],
[AC_MSG_WARN([Required C library type useconds_t not found; try adding -D_POSIX_C_SOURCE=200112L])]
)
AC_CACHE_CHECK([for usleep(us)],
[ac_cv_func_usleep],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <unistd.h>
]],
[[useconds_t us = 1000;
if (usleep(us) != 0) return 1 /* per doc, no errors are returned actually */
/* autoconf adds ";return 0;" */
]])],
[ac_cv_func_usleep=yes], [ac_cv_func_usleep=no]
)])
AS_IF([test x"${ac_cv_func_usleep}" = xyes],
[AC_DEFINE([HAVE_USLEEP], 1, [defined if standard library has, and C standard allows, the usleep(us) method])],
[AC_MSG_WARN([Required C library routine usleep not found; try adding -D_POSIX_C_SOURCE=200112L])]
)
AC_LANG_POP([C])
dnl These routines' arg types differ in strict C standard mode
dnl from what they use in the modes expected by NUT codebase:
dnl bind() : /usr/include/x86_64-linux-gnu/sys/socket.h:123:12: note: expected '__CONST_SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'struct sockaddr *'
dnl accept() : /usr/include/x86_64-linux-gnu/sys/socket.h:243:12: note: expected '__SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'struct sockaddr *'
dnl connect() : /usr/include/x86_64-linux-gnu/sys/socket.h:137:12: note: expected '__CONST_SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'const struct sockaddr *'
dnl sendto() : /usr/include/x86_64-linux-gnu/sys/socket.h:163:16: note: expected '__CONST_SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'struct sockaddr *'
dnl recvfrom() : /usr/include/x86_64-linux-gnu/bits/socket2.h:64:1: note: expected '__SOCKADDR_ARG {aka union <anonymous>}' but argument is of type 'struct sockaddr *'
AC_MSG_CHECKING([whether ln -sr works])