build: use --as-needed to avoid unnecessary dependency on libm

[mirror_kronosnet.git] / configure.ac

#
# Copyright (C) 2010-2018 Red Hat, Inc.  All rights reserved.
#
# Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
#          Federico Simoncelli <fsimon@kronosnet.org>
#
# This software licensed under GPL-2.0+, LGPL-2.0+
#

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
#

AC_PREREQ([2.63])
AC_INIT([kronosnet],
	m4_esyscmd([build-aux/git-version-gen .tarball-version]),
	[devel@lists.kronosnet.org])
# Don't let AC_PROC_CC (invoked by AC_USE_SYSTEM_EXTENSIONS) replace
# undefined CFLAGS with -g -O2, overriding our special OPT_CFLAGS.
: ${CFLAGS=""}
AC_USE_SYSTEM_EXTENSIONS
AM_INIT_AUTOMAKE([1.13 dist-bzip2 dist-xz color-tests -Wno-portability subdir-objects])

LT_PREREQ([2.2.6])
# --enable-new-dtags: Use RUNPATH instead of RPATH.
# It is necessary to have this done before libtool does linker detection.
# See also: https://github.com/kronosnet/kronosnet/issues/107
# --as-needed: Modern systems have builtin ceil() making -lm superfluous but
# AC_SEARCH_LIBS can't detect this because it tests with a false prototype
AX_CHECK_LINK_FLAG([-Wl,--enable-new-dtags],[AM_LDFLAGS=-Wl,--enable-new-dtags])
AX_CHECK_LINK_FLAG([-Wl,--as-needed],[AM_LDFLAGS="$AM_LDFLAGS -Wl,--as-needed"])
AC_SUBST([AM_LDFLAGS])
saved_LDFLAGS="$LDFLAGS"
LDFLAGS="$AM_LDFLAGS $LDFLAGS"
LT_INIT
LDFLAGS="$saved_LDFLAGS"

AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_SRCDIR([kronosnetd/main.c])
AC_CONFIG_HEADERS([config.h])

AC_CANONICAL_HOST
AC_PROG_LIBTOOL

AC_LANG([C])

systemddir=${prefix}/lib/systemd/system

if test "$prefix" = "NONE"; then
	prefix="/usr"
	if test "$localstatedir" = "\${prefix}/var"; then
		localstatedir="/var"
	fi
	if test "$sysconfdir" = "\${prefix}/etc"; then
		sysconfdir="/etc"
	fi
	if test "$systemddir" = "NONE/lib/systemd/system"; then
		systemddir=/lib/systemd/system
	fi
	if test "$libdir" = "\${exec_prefix}/lib"; then
		if test -e /usr/lib64; then
			libdir="/usr/lib64"
		else
			libdir="/usr/lib"
		fi
	fi
fi

AC_PROG_AWK
AC_PROG_GREP
AC_PROG_SED
AC_PROG_CPP
AC_PROG_CC
AC_PROG_CC_C99
if test "x$ac_cv_prog_cc_c99" = "xno"; then
	AC_MSG_ERROR(["C99 support is required"])
fi
AC_PROG_LN_S
AC_PROG_INSTALL
AC_PROG_MAKE_SET
PKG_PROG_PKG_CONFIG
AC_CHECK_PROGS([DOXYGEN], [doxygen])

AC_CHECK_PROGS([VALGRIND_EXEC], [valgrind])
AM_CONDITIONAL([HAS_VALGRIND], [test x$VALGRIND_EXEC != "x"])

# KNET_OPTION_DEFINES(stem,type,detection code)
# stem: enters name of option, Automake conditional and preprocessor define
# type: compress or crypto, determines where the default comes from
AC_DEFUN([KNET_OPTION_DEFINES],[
AC_ARG_ENABLE([$2-$1],[AS_HELP_STRING([--disable-$2-$1],[disable libknet $1 support])],,
	[enable_$2_$1="$enable_$2_all"])
AM_CONDITIONAL([BUILD_]m4_toupper([$2_$1]),[test "x$enable_$2_$1" = xyes])
if test "x$enable_$2_$1" = xyes; then
	$3
fi
AC_DEFINE_UNQUOTED([WITH_]m4_toupper([$2_$1]), [`test "x$enable_$2_$1" != xyes; echo $?`], $1 $2 [built in])
])

AC_ARG_ENABLE([libknet-sctp],
	[AS_HELP_STRING([--disable-libknet-sctp],[disable libknet SCTP support])],,
	[ enable_libknet_sctp="yes" ])
AM_CONDITIONAL([BUILDSCTP], [test x$enable_libknet_sctp = xyes])

AC_ARG_ENABLE([crypto-all],
	[AS_HELP_STRING([--disable-crypto-all],[disable libknet all crypto modules support])],,
	[ enable_crypto_all="yes" ])

KNET_OPTION_DEFINES([nss],[crypto],[PKG_CHECK_MODULES([nss], [nss])])
KNET_OPTION_DEFINES([openssl],[crypto],[
	PKG_CHECK_MODULES([openssl],[libcrypto < 1.1],
			  [AC_DEFINE_UNQUOTED([BUILDCRYPTOOPENSSL10], [1], [openssl 1.0 crypto])],
			  [PKG_CHECK_MODULES([openssl],[libcrypto >= 1.1],
					     [AC_DEFINE_UNQUOTED([BUILDCRYPTOOPENSSL11], [1], [openssl 1.1 crypto])])])
])

AC_ARG_ENABLE([compress-all],
	[AS_HELP_STRING([--disable-compress-all],[disable libknet all compress modules support])],,
	[ enable_compress_all="yes" ])

KNET_OPTION_DEFINES([zlib],[compress],[PKG_CHECK_MODULES([zlib], [zlib])])
KNET_OPTION_DEFINES([lz4],[compress],[PKG_CHECK_MODULES([liblz4], [liblz4])])
KNET_OPTION_DEFINES([lzo2],[compress],[
	PKG_CHECK_MODULES([lzo2], [lzo2],
		[# work around broken pkg-config file in v2.10
		 AC_SUBST([lzo2_CFLAGS],[`echo $lzo2_CFLAGS | sed 's,/lzo *, ,'`])],
		[AC_CHECK_HEADERS([lzo/lzo1x.h],
			[AC_CHECK_LIB([lzo2], [lzo1x_decompress_safe],
				[AC_SUBST([lzo2_LIBS], [-llzo2])])],
				[AC_MSG_ERROR(["missing required lzo/lzo1x.h header"])])])
])
KNET_OPTION_DEFINES([lzma],[compress],[PKG_CHECK_MODULES([liblzma], [liblzma])])
KNET_OPTION_DEFINES([bzip2],[compress],[
	PKG_CHECK_MODULES([bzip2], [bzip2],,
		[AC_CHECK_HEADERS([bzlib.h],
			[AC_CHECK_LIB([bz2], [BZ2_bzBuffToBuffCompress],
				[AC_SUBST([bzip2_LIBS], [-lbz2])])],
				[AC_MSG_ERROR(["missing required bzlib.h"])])])
])

AC_ARG_ENABLE([poc],
	[AS_HELP_STRING([--enable-poc],[enable building poc code])],,
	[ enable_poc="no" ])
AM_CONDITIONAL([BUILD_POC], [test x$enable_poc = xyes])

AC_ARG_ENABLE([kronosnetd],
	[AS_HELP_STRING([--enable-kronosnetd],[Kronosnetd support])],,
	[ enable_kronosnetd="no" ])
AM_CONDITIONAL([BUILD_KRONOSNETD], [test x$enable_kronosnetd = xyes])

AC_ARG_ENABLE([runautogen],
	[AS_HELP_STRING([--enable-runautogen],[run autogen.sh])],,
	[ enable_runautogen="no" ])
AM_CONDITIONAL([BUILD_RUNAUTOGEN], [test x$enable_runautogen = xyes])

override_rpm_debuginfo_option="yes"
AC_ARG_ENABLE([rpm-debuginfo],
	[AS_HELP_STRING([--enable-rpm-debuginfo],[build debuginfo packages])],,
	[ enable_rpm_debuginfo="no", override_rpm_debuginfo_option="no" ])
AM_CONDITIONAL([BUILD_RPM_DEBUGINFO], [test x$enable_rpm_debuginfo = xyes])
AM_CONDITIONAL([OVERRIDE_RPM_DEBUGINFO], [test x$override_rpm_debuginfo_option = xyes])

AC_ARG_ENABLE([libtap],
	[AS_HELP_STRING([--enable-libtap],[libtap support])],,
	[ enable_libtap="no" ])

if test "x$enable_kronosnetd" = xyes; then
	enable_libtap=yes
fi
AM_CONDITIONAL([BUILD_LIBTAP], [test x$enable_libtap = xyes])

## local helper functions
# this function checks if CC support options passed as
# args. Global CPPFLAGS are ignored during this test.
cc_supports_flag() {
	saveCPPFLAGS="$CPPFLAGS"
	CPPFLAGS="$@"
	if echo $CC | grep -q clang; then
		CPPFLAGS="-Werror $CPPFLAGS"
	fi
	AC_MSG_CHECKING([whether $CC supports "$@"])
	AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])],
			  [RC=0; AC_MSG_RESULT([yes])],
			  [RC=1; AC_MSG_RESULT([no])])
	CPPFLAGS="$saveCPPFLAGS"
	return $RC
}

# Checks for C features
AC_C_INLINE

# Checks for libraries.
AX_PTHREAD(,[AC_MSG_ERROR([POSIX threads support is required])])
AC_CHECK_LIB([m], [ceil], [AC_SUBST([m_LIBS], [-lm])], [AC_MSG_ERROR([kronosnet requires m library])])
saved_LIBS="$LIBS"
LIBS=
AC_SEARCH_LIBS([clock_gettime], [rt], , [AC_MSG_ERROR([clock_gettime not found])])
AC_SUBST([rt_LIBS], [$LIBS])
LIBS=
AC_SEARCH_LIBS([dlopen], [dl dld], , [AC_MSG_ERROR([dlopen not found])])
AC_SUBST([dl_LIBS], [$LIBS])
LIBS="$saved_LIBS"

# OS detection

AC_MSG_CHECKING([for os in ${host_os}])
case "$host_os" in
	*linux*)
		AC_DEFINE_UNQUOTED([KNET_LINUX], [1], [Compiling for Linux platform])
		AC_MSG_RESULT([Linux])
		;;
	*bsd*)
		AC_DEFINE_UNQUOTED([KNET_BSD], [1], [Compiling for BSD platform])
		AC_MSG_RESULT([BSD])
		if test "x$enable_libtap" = xyes; then
			AC_MSG_ERROR([libtap is not currently supported on BSD platforms])
		fi
		;;
	*)
		AC_MSG_ERROR([Unsupported OS? hmmmm])
		;;
esac

# Checks for header files.
AC_CHECK_HEADERS([fcntl.h])
AC_CHECK_HEADERS([stdlib.h])
AC_CHECK_HEADERS([string.h])
AC_CHECK_HEADERS([strings.h])
AC_CHECK_HEADERS([sys/ioctl.h])
AC_CHECK_HEADERS([syslog.h])
AC_CHECK_HEADERS([unistd.h])
AC_CHECK_HEADERS([netinet/in.h])
AC_CHECK_HEADERS([sys/socket.h])
AC_CHECK_HEADERS([arpa/inet.h])
AC_CHECK_HEADERS([netdb.h])
AC_CHECK_HEADERS([limits.h])
AC_CHECK_HEADERS([stdint.h])
AC_CHECK_HEADERS([sys/epoll.h])

if test "x$enable_libknet_sctp" = xyes; then
	AC_CHECK_HEADERS([netinet/sctp.h],, [AC_MSG_ERROR(["missing required SCTP headers"])])
fi

# Checks for typedefs, structures, and compiler characteristics.
AC_C_INLINE
AC_TYPE_SIZE_T
AC_TYPE_PID_T
AC_TYPE_SSIZE_T
AC_TYPE_UINT8_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AC_TYPE_INT32_T

# Checks for library functions.
AC_FUNC_ALLOCA
AC_FUNC_FORK
AC_FUNC_MALLOC
AC_FUNC_REALLOC
AC_CHECK_FUNCS([kevent])
# if neither sys/epoll.h nor kevent are present, we should fail.

if test "x$ac_cv_header_sys_epoll_h" = xno && test "x$ac_cv_func_kevent" = xno; then
	AC_MSG_ERROR([Both epoll and kevent unavailable on this OS])
fi

if test "x$ac_cv_header_sys_epoll_h" = xyes && test "x$ac_cv_func_kevent" = xyes; then
	AC_MSG_ERROR([Both epoll and kevent available on this OS, please contact the maintainers to fix the code])
fi

# required by doxyman to build man pages dynamically
PKG_CHECK_MODULES([libqb], [libqb])
PKG_CHECK_MODULES([libxml], [libxml-2.0])

# checks (for kronosnetd)
if test "x$enable_kronosnetd" = xyes; then
	AC_CHECK_HEADERS([security/pam_appl.h],
			 [AC_CHECK_LIB([pam], [pam_start],
				       [AC_SUBST([pam_LIBS], [-lpam])],
				       [AC_MSG_ERROR([Unable to find LinuxPAM devel files])])])

	AC_CHECK_HEADERS([security/pam_misc.h],
			 [AC_CHECK_LIB([pam_misc], [misc_conv],
				       [AC_SUBST([pam_misc_LIBS], [-lpam_misc])],
				       [AC_MSG_ERROR([Unable to find LinuxPAM MISC devel files])])])

	AC_CHECK_LIB([qb], [qb_log_thread_priority_set],
		     [have_qb_log_thread_priority_set="yes"],
		     [have_qb_log_thread_priority_set="no"])
	if test "x${have_qb_log_thread_priority_set}" = xyes; then
		AC_DEFINE_UNQUOTED([HAVE_QB_LOG_THREAD_PRIORITY_SET], [1], [have qb_log_thread_priority_set])
	fi
fi

# local options
AC_ARG_ENABLE([debug],
	[AS_HELP_STRING([--enable-debug],[enable debug build])])

AC_ARG_WITH([initdefaultdir],
	[AS_HELP_STRING([--with-initdefaultdir=DIR],[path to /etc/sysconfig or /etc/default dir])],
	[ INITDEFAULTDIR="$withval" ],
	[ INITDEFAULTDIR="$sysconfdir/default" ])

AC_ARG_WITH([initddir],
	[AS_HELP_STRING([--with-initddir=DIR],[path to init script directory])],
	[ INITDDIR="$withval" ],
	[ INITDDIR="$sysconfdir/init.d" ])

AC_ARG_WITH([systemddir],
	[AS_HELP_STRING([--with-systemddir=DIR],[path to systemd unit files directory])],
	[ SYSTEMDDIR="$withval" ],
	[ SYSTEMDDIR="$systemddir" ])

AC_ARG_WITH([syslogfacility],
	[AS_HELP_STRING([--with-syslogfacility=FACILITY],[default syslog facility])],
	[ SYSLOGFACILITY="$withval" ],
	[ SYSLOGFACILITY="LOG_DAEMON" ])

AC_ARG_WITH([sysloglevel],
	[AS_HELP_STRING([--with-sysloglevel=LEVEL],[default syslog level])],
	[ SYSLOGLEVEL="$withval" ],
	[ SYSLOGLEVEL="LOG_INFO" ])

AC_ARG_WITH([defaultadmgroup],
	[AS_HELP_STRING([--with-defaultadmgroup=GROUP],
		[define PAM group. Users part of this group will be allowed to configure
		 kronosnet. Others will only receive read-only rights.])],
	[ DEFAULTADMGROUP="$withval" ],
	[ DEFAULTADMGROUP="kronosnetadm" ])

## random vars
LOGDIR=${localstatedir}/log/
RUNDIR=${localstatedir}/run/
DEFAULT_CONFIG_DIR=${sysconfdir}/kronosnet

## do subst

AC_SUBST([DEFAULT_CONFIG_DIR])
AC_SUBST([INITDEFAULTDIR])
AC_SUBST([INITDDIR])
AC_SUBST([SYSTEMDDIR])
AC_SUBST([LOGDIR])
AC_SUBST([DEFAULTADMGROUP])

AC_DEFINE_UNQUOTED([DEFAULT_CONFIG_DIR],
		   ["$(eval echo ${DEFAULT_CONFIG_DIR})"],
		   [Default config directory])

AC_DEFINE_UNQUOTED([DEFAULT_CONFIG_FILE],
		   ["$(eval echo ${DEFAULT_CONFIG_DIR}/kronosnetd.conf)"],
		   [Default config file])

AC_DEFINE_UNQUOTED([LOGDIR],
		   ["$(eval echo ${LOGDIR})"],
		   [Default logging directory])

AC_DEFINE_UNQUOTED([DEFAULT_LOG_FILE],
		   ["$(eval echo ${LOGDIR}/kronosnetd.log)"],
		   [Default log file])

AC_DEFINE_UNQUOTED([RUNDIR],
		   ["$(eval echo ${RUNDIR})"],
		   [Default run directory])

AC_DEFINE_UNQUOTED([SYSLOGFACILITY],
		   [$(eval echo ${SYSLOGFACILITY})],
		   [Default syslog facility])

AC_DEFINE_UNQUOTED([SYSLOGLEVEL],
		   [$(eval echo ${SYSLOGLEVEL})],
		   [Default syslog level])

AC_DEFINE_UNQUOTED([DEFAULTADMGROUP],
		   ["$(eval echo ${DEFAULTADMGROUP})"],
		   [Default admin group])

# debug build stuff
if test "x${enable_debug}" = xyes; then
	AC_DEFINE_UNQUOTED([DEBUG], [1], [Compiling Debugging code])
	OPT_CFLAGS="-O0"
else
	OPT_CFLAGS="-O3"
fi

# gdb flags
if test "x${GCC}" = xyes; then
	GDB_FLAGS="-ggdb3"
else
	GDB_FLAGS="-g"
fi

# extra warnings
EXTRA_WARNINGS=""

WARNLIST="
	all
	extra
	unused
	shadow
	missing-prototypes
	missing-declarations
	suggest-attribute=noreturn
	suggest-attribute=format
	strict-prototypes
	declaration-after-statement
	pointer-arith
	write-strings
	cast-align
	bad-function-cast
	missing-format-attribute
	float-equal
	format=2
	format-signedness
	format-security
	format-nonliteral
	no-long-long
	unsigned-char
	gnu89-inline
	no-strict-aliasing
	error
	address
	cpp
	overflow
	parentheses
	sequence-point
	switch
	shift-overflow=2
	overlength-strings
	retundent-decls
	init-self
	uninitialized
	unused-but-set-variable
	unused-function
	unused-result
	unused-value
	unused-variable
	unknown-pragmas
	no-unused-parameter
	"

for j in $WARNLIST; do
	if cc_supports_flag -W$j; then
		EXTRA_WARNINGS="$EXTRA_WARNINGS -W$j";
	fi
done

AC_SUBST([AM_CFLAGS],["$OPT_CFLAGS $GDB_FLAGS $EXTRA_WARNINGS"])

AC_CONFIG_FILES([
		Makefile
		init/Makefile
		libtap/Makefile
		libtap/libtap.pc
		kronosnetd/Makefile
		kronosnetd/kronosnetd.logrotate
		libknet/Makefile
		libknet/libknet.pc
		libknet/tests/Makefile
		libknet/man/Doxyfile
		libknet/man/Makefile
		build-aux/Makefile
		poc-code/Makefile
		poc-code/iov-hash/Makefile
		poc-code/access-list/Makefile
		])

AC_OUTPUT