#!/usr/bin/env bash

set -e

trap 'echo -e "\n\nConfiguration failed\n\n" >&2' ERR

rootdir=$(readlink -f $(dirname $0))
source "$rootdir/scripts/common.sh"

function usage() {
	echo "'configure' configures SPDK to compile on supported platforms."
	echo ""
	echo "Usage: ./configure [OPTION]..."
	echo ""
	echo "Defaults for the options are specified in brackets."
	echo ""
	echo "General:"
	echo " -h, --help                Display this help and exit"
	echo ""
	echo " --prefix=path             Configure installation prefix (default: /usr/local)"
	echo " --target-arch=arch        Target build architecture. Must be a valid GNU arch. Default: native"
	echo ""
	echo " --cross-prefix=prefix     Prefix for cross compilation (default: none)"
	echo "                           example: aarch64-linux-gnu"
	echo " --libdir=path             Configure installation path for the libraries (default: \$prefix/lib)"
	echo ""
	echo " --enable-debug            Configure for debug builds"
	echo " --enable-werror           Treat compiler warnings as errors"
	echo " --enable-asan             Enable address sanitizer"
	echo " --enable-ubsan            Enable undefined behavior sanitizer"
	echo " --enable-coverage         Enable code coverage tracking"
	echo " --enable-lto              Enable link-time optimization"
	echo " --enable-pgo-capture      Enable generation of profile guided optimization data"
	echo " --enable-pgo-use          Use previously captured profile guided optimization data"
	echo " --enable-cet              Enable Intel Control-flow Enforcement Technology (CET)"
	echo " --disable-tests           Disable building of functional tests"
	echo " --disable-unit-tests      Disable building of unit tests"
	echo " --disable-examples        Disable building of examples"
	echo " --disable-apps            Disable building of apps"
	echo ""
	echo "Specifying Dependencies:"
	echo "--with-DEPENDENCY[=path]   Use the given dependency. Optionally, provide the"
	echo "                           path."
	echo "--without-DEPENDENCY       Do not link to the given dependency. This may"
	echo "                           disable features and components."
	echo ""
	echo "Valid dependencies are listed below."
	echo " --with-dpdk[=DIR]         Build against a custom dpdk version. By default, the dpdk"
	echo " --without-dpdk            submodule in spdk tree will be used."
	echo "                           example: /usr/share/dpdk/x86_64-default-linuxapp-gcc"
	echo " --with-env=DIR            Use an alternate environment implementation instead of DPDK."
	echo "                           Implies --without-dpdk."
	echo " --with-idxd               Build the IDXD library and accel framework plug-in module."
	echo " --without-idxd            Disabled while experimental. Only built for x86 when enabled."
	echo " --with-crypto             Build vbdev crypto module."
	echo " --without-crypto          No path required."
	echo " --with-fio[=DIR]          Build fio_plugin."
	echo " --without-fio             default: /usr/src/fio"
	echo " --with-xnvme              Build xNVMe bdev module."
	echo " --without-xnvme           No path required."
	echo " --with-vhost              Build vhost target. Enabled by default."
	echo " --without-vhost           No path required."
	echo " --with-virtio             Build vhost initiator and virtio-pci bdev modules."
	echo " --without-virtio          No path required."
	echo " --with-vfio-user[=DIR]    Build custom vfio-user transport for NVMf target and NVMe initiator."
	echo " --without-vfio-user       example: /usr/src/libvfio-user"
	echo " --with-pmdk[=DIR]         Build persistent memory bdev.
					 example: /usr/share/pmdk"
	echo " --without-pmdk		 No path required."
	echo " --with-reduce             Build vbdev compression module."
	echo " --without-reduce          No path required."
	echo " --with-rbd                Build Ceph RBD bdev module."
	echo " --without-rbd             No path required."
	echo " --with-rdma[=DIR]         Build RDMA transport for NVMf target and initiator."
	echo " --without-rdma            Accepts optional RDMA provider name. Can be \"verbs\" or \"mlx5_dv\"."
	echo "                           If no provider specified, \"verbs\" provider is used by default."
	echo " --with-fc[=DIR]           Build FC transport for NVMf target."
	echo " --without-fc              If an argument is provided, it is considered a directory containing"
	echo "                           libufc.a and fc_lld.h. Otherwise the regular system paths will"
	echo "                           be searched."
	echo " --with-shared             Build spdk shared libraries."
	echo " --without-shared          No path required."
	echo " --with-iscsi-initiator    Build with iscsi bdev module."
	echo " --without-iscsi-initiator No path required."
	echo " --with-vtune=DIR          Required to profile I/O under Intel VTune Amplifier XE."
	echo " --without-vtune           example: /opt/intel/vtune_amplifier_xe_version"
	echo " --with-ocf[=DIR]          Build OCF library and bdev module."
	echo " --without-ocf             If argument is directory, interpret it as root of OCF repo"
	echo "                           If argument is file, interpret it as compiled OCF lib"
	echo "                           If no argument is specified, OCF git submodule is used by default"
	echo "                           example: /usr/src/ocf/"
	echo " --with-isal               Build with ISA-L. Enabled by default on x86 and aarch64 architectures."
	echo " --without-isal            No path required."
	echo " --with-uring[=DIR]        Build I/O uring bdev or socket module."
	echo " --without-uring           If an argument is provided, it is considered a directory containing"
	echo "                           liburing.a and io_uring.h. Otherwise the regular system paths will"
	echo "                           be searched."
	echo " --with-openssl[=DIR]      Build OPENSSL with custom path. Otherwise the regular system paths will"
	echo "                           be searched."
	echo " --with-fuse               Build FUSE components for mounting a blobfs filesystem."
	echo " --without-fuse            No path required."
	echo " --with-nvme-cuse          Build NVMe driver with support for CUSE-based character devices."
	echo " --without-nvme-cuse       No path required."
	echo " --with-raid5              Build with bdev_raid module RAID5 support."
	echo " --without-raid5           No path required."
	echo " --with-wpdk=DIR           Build using WPDK to provide support for Windows (experimental)."
	echo " --without-wpdk            The argument must be a directory containing lib and include."
	echo " --with-usdt               Build with userspace DTrace probes enabled."
	echo " --without-usdt            No path required."
	echo " --with-fuzzer             Build with LLVM fuzzing enabled."
	echo "                           Path to clang_rt.fuzzer_no_main library required."
	echo "                           Requires setting CC and CXX to clang."
	echo "                           (Typically /usr/lib/llvm-VER/lib/clang/VER/lib/linux/libclang_rt.fuzzer_no_main-ARCH.a)"
	echo " --with-sma                Generate Storage Management Agent's protobuf interface"
	echo " --without-sma             No path required."
	echo ""
	echo "Environment variables:"
	echo ""
	echo "CC                         C compiler"
	echo "CFLAGS                     C compiler flags"
	echo "CXX                        C++ compiler"
	echo "CXXFLAGS                   C++ compiler flags"
	echo "LD                         Linker"
	echo "LDFLAGS                    Linker flags"
	echo "DESTDIR                    Destination for 'make install'"
	echo ""
}

# Load default values
# Convert config to sourceable configuration file
sed -r 's/CONFIG_([[:alnum:]_]+)=(.*)/CONFIG[\1]=\2/g' $rootdir/CONFIG > $rootdir/CONFIG.sh
declare -A CONFIG
source $rootdir/CONFIG.sh
rm $rootdir/CONFIG.sh

# Try to expand literal ~ that might have been passed as an option via --long-opt=~/dir.
set -- "${@//\~/~}"

for i in "$@"; do
	case "$i" in
		--cross-prefix=*)
			CONFIG[CROSS_PREFIX]="${i#*=}"
			;;
		--enable-lto)
			CONFIG[LTO]=y
			;;
		--disable-lto)
			CONFIG[LTO]=n
			;;
	esac
done

# Detect the compiler toolchain
$rootdir/scripts/detect_cc.sh --cc="$CC" --cxx="$CXX" --lto="${CONFIG[LTO]}" --ld="$LD" --cross-prefix="${CONFIG[CROSS_PREFIX]}" > $rootdir/mk/cc.mk

CC=$(grep "DEFAULT_CC=" "$rootdir/mk/cc.mk" | sed s/DEFAULT_CC=//)
CC_TYPE=$(grep "CC_TYPE=" "$rootdir/mk/cc.mk" | cut -d "=" -f 2)

arch=$($CC -dumpmachine)
sys_name=$(uname -s)

if [[ $arch == *mingw* ]] || [[ $arch == *windows* ]]; then
	sys_name=Windows
fi

# Sanitize default configuration. All parameters set by user explicit should fail
# Force no ISA-L if non-x86 or non-aarch64 architecture
if [[ "${CONFIG[ISAL]}" = "y" ]]; then
	if [[ $arch != x86_64* ]] && [[ $arch != aarch64* ]]; then
		CONFIG[ISAL]=n
		echo "Notice: ISA-L not supported for ${arch}. Turning off default feature."
	fi
fi

if [[ $sys_name != "Linux" ]]; then
	# Vhost, rte_vhost library and virtio are only supported on Linux.
	CONFIG[VHOST]="n"
	CONFIG[VIRTIO]="n"
	echo "Notice: Vhost, rte_vhost library and virtio are only supported on Linux. Turning off default feature."
fi

#check nasm only on x86
if [[ $arch == x86_64* ]]; then
	ver=$(nasm -v 2> /dev/null | awk '{print $3}' | awk -Fr '{print $1}')
	if lt "$ver" 2.14; then
		# ISA-L, compression & crypto require NASM version 2.14 or newer.
		CONFIG[ISAL]=n
		CONFIG[CRYPTO]=n
		CONFIG[IPSEC_MB]=n
		CONFIG[REDUCE]=n
		HAVE_NASM=n
		echo "Notice: ISA-L, compression & crypto require NASM version 2.14 or newer. Turning off default ISA-L and crypto features."
	else
		HAVE_NASM=y
	fi
fi

function check_dir() {
	arg="$1"
	dir="${arg#*=}"
	if [ ! -d "$dir" ]; then
		echo "$arg: directory not found"
		exit 1
	fi
}

# On x86_64 'clang -dumpmachine' produces x86_64-pc-linux-gnu
# whereas the dpdk might be built with gcc and its libs lie in
# x86_64-linux-gnu. Let's find the right libdir for dpdkd libs.
function find_dpdk_arch_libdir() {
	local dpdk_dir=$1

	# Checking first what we have with $arch, then clang
	# variant of arch.
	arches=("$arch" "$(echo $arch | sed 's/-pc//g')")
	for a in "${arches[@]}"; do
		local libdir="$dpdk_dir/lib/$a"
		if [[ -d $libdir ]]; then
			echo $libdir
			return
		fi
	done

	# Fallback to the libdir without arch component
	echo "$dpdk_dir/lib"
}

function check_IPSec_mb() {
	local mode=$1
	local dpdk_libdir=$2
	local dpdk_incdir=$3
	local have_ipsec_mb=n

	if [[ $mode = "pkg-config" ]]; then
		local dpdk_libs

		# Request libdpdk pkg-config settings to figure out if the IPSec_MB is used
		# as a dependency.
		# Due to some reason pkg-config shows -lIPSec_MB only with --static option
		dpdk_libs=$(PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$dpdk_libdir/pkgconfig" pkg-config --libs --static libdpdk)
		if echo "$dpdk_libs" | grep "\-lIPSec_MB" > /dev/null 2>&1; then
			have_ipsec_mb=y
		fi
	elif [[ $mode = "build-config" ]]; then
		# Use dpdk build config header to check if the IPSec_MB was used.
		if grep -F "define RTE_CRYPTO_IPSEC_MB 1" "$dpdk_incdir/rte_build_config.h" > /dev/null 2>&1; then
			have_ipsec_mb=y
		fi
	else
		echo "ERROR: Invalid IPSec_MB checking mode $mode."
		echo "ERROR: Only \"pkg-config\" and \"build-config\" available."
		exit 1
	fi
	if [[ $have_ipsec_mb = "n" ]]; then
		CONFIG[IPSEC_MB]=n
		return
	fi

	# Since we don't know the library path where the IPSec_MB is located
	# let's find it out with the ldd utility. This can be a standard location
	# or a custom build.
	local librte_crypto_ipsec_mb="$dpdk_libdir/librte_crypto_ipsec_mb.so"
	if [[ -f "$librte_crypto_ipsec_mb" ]]; then
		local ipsec_mb_libdir

		ipsec_mb_libdir=$(ldd "$librte_crypto_ipsec_mb" | grep "libIPSec_MB.so" \
			| sed -e 's/\s*libIPSec_MB.so.*=>\s//' -e 's/\/libIPSec_MB.so.*$//')
		if [[ -d $ipsec_mb_libdir ]]; then
			CONFIG[IPSEC_MB]=y
			CONFIG[IPSEC_MB_DIR]="$ipsec_mb_libdir"
		elif [[ $ipsec_mb_libdir = "not found" ]]; then
			# ldconfig cache is broken, old build with refs to non-existing libs, etc.
			echo "ERROR: Invalid IPSec_MB installation. Library is not found and/or ldconfig cache is broken!"
			exit 1
		else
			# Failed to check for IPSec_MB lib path. Let's just assume it is lives
			# in one of the standard locations (/usr/lib, etc.).
			CONFIG[IPSEC_MB]=y
		fi
	else
		# pkg-config says there is IPSec_mb and dpdk lib does not have it. Let's just
		# assume it is installed in the system in one of the standard locations.
		CONFIG[IPSEC_MB]=y
	fi
}

for i in "$@"; do
	case "$i" in
		-h | --help)
			usage
			exit 0
			;;
		--cross-prefix=*) ;&
		--enable-lto) ;&
		--disable-lto)
			# Options handled before detecting CC.
			;;
		--prefix=*)
			CONFIG[PREFIX]="${i#*=}"
			;;
		--target-arch=*)
			CONFIG[ARCH]="${i#*=}"
			;;
		--libdir=*)
			CONFIG[LIBDIR]="${i#*=}"
			;;
		--enable-debug)
			CONFIG[DEBUG]=y
			;;
		--disable-debug)
			CONFIG[DEBUG]=n
			;;
		--enable-asan)
			CONFIG[ASAN]=y
			;;
		--disable-asan)
			CONFIG[ASAN]=n
			;;
		--enable-ubsan)
			CONFIG[UBSAN]=y
			;;
		--disable-ubsan)
			CONFIG[UBSAN]=n
			;;
		--enable-tsan)
			CONFIG[TSAN]=y
			;;
		--disable-tsan)
			CONFIG[TSAN]=n
			;;
		--enable-coverage)
			CONFIG[COVERAGE]=y
			;;
		--disable-coverage)
			CONFIG[COVERAGE]=n
			;;
		--enable-pgo-capture)
			CONFIG[PGO_CAPTURE]=y
			;;
		--disable-pgo-capture)
			CONFIG[PGO_CAPTURE]=n
			;;
		--enable-pgo-use)
			CONFIG[PGO_USE]=y
			;;
		--disable-pgo-use)
			CONFIG[PGO_USE]=n
			;;
		--enable-tests)
			CONFIG[TESTS]=y
			;;
		--disable-tests)
			CONFIG[TESTS]=n
			;;
		--enable-unit-tests)
			CONFIG[UNIT_TESTS]=y
			;;
		--disable-unit-tests)
			CONFIG[UNIT_TESTS]=n
			;;
		--enable-examples)
			CONFIG[EXAMPLES]=y
			;;
		--disable-examples)
			CONFIG[EXAMPLES]=n
			;;
		--enable-apps)
			CONFIG[APPS]=y
			;;
		--disable-apps)
			CONFIG[APPS]=N
			;;
		--enable-werror)
			CONFIG[WERROR]=y
			;;
		--disable-werror)
			CONFIG[WERROR]=n
			;;
		--enable-cet)
			CONFIG[CET]=y
			;;
		--disable-cet)
			CONFIG[CET]=n
			;;
		--with-dpdk)
			# Can we use pkg-config?
			if command -v "pkg-config" > /dev/null 2>&1 && pkg-config --exists libdpdk; then
				dpdk_libdir=$(pkg-config --variable=libdir libdpdk)
				dpdk_libdir=$(readlink -f $dpdk_libdir)
				dpdk_incdir=$(pkg-config --variable=includedir libdpdk)
				echo "Using DPDK lib dir $dpdk_libdir"
				CONFIG[DPDK_LIB_DIR]=$dpdk_libdir
				CONFIG[DPDK_INC_DIR]=$dpdk_incdir
				CONFIG[DPDK_PKG_CONFIG]=y
				if pkg-config --print-requires libdpdk | grep "libbsd" > /dev/null 2>&1; then
					CONFIG[HAVE_LIBBSD]=y
				fi
				CFLAGS="${CFLAGS:+$CFLAGS }$(pkg-config --cflags libdpdk)"
				check_IPSec_mb "pkg-config" "$dpdk_libdir" "$dpdk_incdir"
			else
				echo "libdpdk.pc not found, aborting"
				exit 1
			fi
			;;
		--with-dpdk=*)
			check_dir "$i"
			dpdk_dir=$(readlink -f ${i#*=})
			dpdk_libdir=$(find_dpdk_arch_libdir $dpdk_dir)
			dpdk_incdir="$dpdk_dir/include"

			# Can we use pkg-config?
			if command -v "pkg-config" > /dev/null 2>&1 && PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$dpdk_libdir/pkgconfig" pkg-config --exists libdpdk; then
				echo "Using $dpdk_libdir/pkgconfig for additional libs..."
				sysroot_dir=$(PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$dpdk_libdir/pkgconfig" pkg-config --variable=pc_sysrootdir libdpdk)
				dpdk_libdir=$(PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$dpdk_libdir/pkgconfig" pkg-config --variable=libdir libdpdk)
				dpdk_libdir=$(readlink -f "${sysroot_dir}$dpdk_libdir")
				if ! echo $dpdk_libdir | grep $dpdk_dir > /dev/null 2>&1; then
					echo "ERROR: pkg-config reported DPDK libdir $dpdk_libdir is out of the directory specified with --with-dpdk="
					echo "ERROR: do you have another DPDK installed in the system?"
					exit 1
				fi
				dpdk_reqs=$(PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$dpdk_libdir/pkgconfig" pkg-config --print-requires libdpdk)
				if echo $dpdk_reqs | grep "libbsd" > /dev/null 2>&1; then
					CONFIG[HAVE_LIBBSD]=y
				fi
				CFLAGS="${CFLAGS:+$CFLAGS }$(PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$dpdk_libdir/pkgconfig" pkg-config --cflags libdpdk)"
				dpdk_incdir="${sysroot_dir}$(PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$dpdk_libdir/pkgconfig" pkg-config --variable=includedir libdpdk)"
				check_IPSec_mb "pkg-config" "$dpdk_libdir" "$dpdk_incdir"
			else
				echo "Using $dpdk_incdir/rte_build_config.h for additional libs..."

				if grep -F "define RTE_USE_LIBBSD 1" $dpdk_incdir/rte_build_config.h > /dev/null 2>&1; then
					CONFIG[HAVE_LIBBSD]=y
				fi
				check_IPSec_mb "build-config" "$dpdk_libdir" "$dpdk_incdir"
			fi
			echo "DPDK libraries: $dpdk_libdir"
			echo "DPDK includes: $dpdk_incdir"
			CONFIG[DPDK_DIR]=$dpdk_dir
			CONFIG[DPDK_LIB_DIR]="$dpdk_libdir"
			CONFIG[DPDK_INC_DIR]="$dpdk_incdir"
			CONFIG[DPDK_PKG_CONFIG]=n
			;;
		--without-dpdk)
			CONFIG[DPDK_DIR]=
			;;
		--with-wpdk=*)
			check_dir "$i"
			CONFIG[WPDK_DIR]=$(readlink -f ${i#*=})
			;;
		--without-wpdk)
			CONFIG[WPDK_DIR]=
			;;
		--with-env=*)
			CONFIG[ENV]="${i#*=}"
			;;
		--with-rbd)
			CONFIG[RBD]=y
			;;
		--without-rbd)
			CONFIG[RBD]=n
			;;
		--with-rdma=*)
			CONFIG[RDMA]=y
			CONFIG[RDMA_PROV]=${i#*=}
			;;
		--with-rdma)
			CONFIG[RDMA]=y
			CONFIG[RDMA_PROV]="verbs"
			;;
		--without-rdma)
			CONFIG[RDMA]=n
			;;
		--with-fc=*)
			CONFIG[FC]=y
			CONFIG[FC_PATH]=$(readlink -f ${i#*=})
			;;
		--with-fc)
			CONFIG[FC]=y
			CONFIG[FC_PATH]=
			;;
		--without-fc)
			CONFIG[FC]=n
			CONFIG[FC_PATH]=
			;;
		--with-shared)
			CONFIG[SHARED]=y
			;;
		--without-shared)
			CONFIG[SHARED]=n
			;;
		--with-iscsi-initiator)
			CONFIG[ISCSI_INITIATOR]=y
			;;
		--without-iscsi-initiator)
			CONFIG[ISCSI_INITIATOR]=n
			;;
		--with-crypto)
			CONFIG[CRYPTO]=y
			;;
		--without-crypto)
			CONFIG[CRYPTO]=n
			;;
		--with-vhost)
			CONFIG[VHOST]=y
			;;
		--without-vhost)
			CONFIG[VHOST]=n
			;;
		--with-virtio)
			CONFIG[VIRTIO]=y
			;;
		--without-virtio)
			CONFIG[VIRTIO]=n
			;;
		--with-vfio-user)
			CONFIG[VFIO_USER]=y
			CONFIG[VFIO_USER_DIR]=""
			;;
		--with-vfio-user=*)
			CONFIG[VFIO_USER]=y
			check_dir "$i"
			CONFIG[VFIO_USER_DIR]=$(readlink -f ${i#*=})
			;;
		--without-vfio-user)
			CONFIG[VFIO_USER]=n
			;;
		--with-pmdk)
			CONFIG[PMDK]=y
			CONFIG[PMDK_DIR]=""
			;;
		--with-pmdk=*)
			CONFIG[PMDK]=y
			check_dir "$i"
			CONFIG[PMDK_DIR]=$(readlink -f ${i#*=})
			;;
		--without-pmdk)
			CONFIG[PMDK]=n
			;;
		--with-reduce)
			CONFIG[REDUCE]=y
			;;
		--without-reduce)
			CONFIG[REDUCE]=n
			;;
		--with-xnvme)
			CONFIG[XNVME]=y
			;;
		--without-xnvme)
			CONFIG[XNVME]=n
			;;
		--with-fio) ;&
		--with-fio=*)
			if [[ ${i#*=} != "$i" ]]; then
				CONFIG[FIO_SOURCE_DIR]=${i#*=}
			fi
			check_dir "--with-fio=${CONFIG[FIO_SOURCE_DIR]}"
			CONFIG[FIO_SOURCE_DIR]=$(readlink -f "${CONFIG[FIO_SOURCE_DIR]}")
			CONFIG[FIO_PLUGIN]=y
			;;
		--without-fio)
			CONFIG[FIO_PLUGIN]=n
			;;
		--with-vtune=*)
			check_dir "$i"
			CONFIG[VTUNE_DIR]="${i#*=}"
			CONFIG[VTUNE]=y
			;;
		--without-vtune)
			CONFIG[VTUNE_DIR]=
			CONFIG[VTUNE]=n
			;;
		--with-ocf)
			CONFIG[OCF]=y
			CONFIG[OCF_PATH]=$(readlink -f "./ocf")
			;;
		--with-ocf=*)
			CONFIG[OCF]=y
			CONFIG[OCF_PATH]=$(readlink -f ${i#*=})
			;;
		--without-ocf)
			CONFIG[OCF]=n
			CONFIG[OCF_PATH]=
			;;
		--with-isal)
			CONFIG[ISAL]=y
			;;
		--without-isal)
			CONFIG[ISAL]=n
			;;
		--with-uring=*)
			CONFIG[URING]=y
			CONFIG[URING_PATH]=$(readlink -f ${i#*=})
			;;
		--with-uring)
			CONFIG[URING]=y
			CONFIG[URING_PATH]=
			;;
		--without-uring)
			CONFIG[URING]=n
			CONFIG[URING_PATH]=
			;;
		--with-openssl=*)
			check_dir "$i"
			CONFIG[OPENSSL_PATH]=$(readlink -f ${i#*=})
			;;
		--with-fuse)
			CONFIG[FUSE]=y
			;;
		--without-fuse)
			CONFIG[FUSE]=n
			;;
		--with-nvme-cuse)
			CONFIG[NVME_CUSE]=y
			;;
		--without-nvme-cuse)
			CONFIG[NVME_CUSE]=n
			;;
		--with-raid5)
			CONFIG[RAID5]=y
			;;
		--without-raid5)
			CONFIG[RAID5]=n
			;;
		--with-idxd)
			CONFIG[IDXD]=y
			CONFIG[IDXD_KERNEL]=n
			;;
		--without-idxd)
			CONFIG[IDXD]=n
			;;
		--with-usdt)
			CONFIG[USDT]=y
			;;
		--without-usdt)
			CONFIG[USDT]=n
			;;
		--with-fuzzer)
			echo "Must specify fuzzer library path with --with-fuzzer"
			usage
			exit 1
			;;
		--with-fuzzer=*)
			CONFIG[FUZZER]=y
			CONFIG[FUZZER_LIB]=$(readlink -f ${i#*=})
			;;
		--without-fuzzer)
			CONFIG[FUZZER]=n
			CONFIG[FUZZER_LIB]=
			;;
		--with-sma)
			CONFIG[SMA]=y
			;;
		--without-sma)
			CONFIG[SMA]=n
			;;
		--)
			break
			;;
		*)
			echo "Unrecognized option $i"
			usage
			exit 1
			;;
	esac
done

if [[ $arch == x86_64* ]]; then
	BUILD_CMD=($CC -o /dev/null -x c $CPPFLAGS $CFLAGS $LDFLAGS "-march=native")
else
	BUILD_CMD=($CC -o /dev/null -x c $CPPFLAGS $CFLAGS $LDFLAGS)
fi
BUILD_CMD+=(-I/usr/local/include -L/usr/local/lib)

if [[ "${CONFIG[VFIO_USER]}" = "y" ]]; then
	if ! echo -e '#include <json-c/json.h>' \
		| "${BUILD_CMD[@]}" -E - 2> /dev/null; then
		echo "ERROR: --with-vfio-user requires json-c-devel"
		echo "Please install then re-run this script"
		exit 1
	fi
	if ! echo -e '#include <cmocka.h>' \
		| "${BUILD_CMD[@]}" -E - 2> /dev/null; then
		echo "ERROR: --with-vfio-user requires libcmocka-devel"
		echo "Please install then re-run this script"
		exit 1
	fi
fi

# IDXD uses Intel specific instructions.
if [[ "${CONFIG[IDXD]}" = "y" ]]; then
	if [ $(uname -s) == "FreeBSD" ]; then
		intel="hw.model: Intel"
		cpu_vendor=$(sysctl -a | grep hw.model | cut -c 1-15)
	else
		intel="GenuineIntel"
		cpu_vendor=$(grep -i 'vendor' /proc/cpuinfo --max-count=1)
	fi
	if [[ "$cpu_vendor" != *"$intel"* ]]; then
		echo "ERROR: IDXD cannot be used due to CPU incompatibility."
		exit 1
	fi
	if [ -e /usr/include/accel-config/libaccel_config.h ]; then
		CONFIG[IDXD_KERNEL]=y
	fi

fi

# Detect architecture and force no ISA-L if non-x86 or non-aarch64 architecture
if [[ "${CONFIG[ISAL]}" = "y" ]]; then
	if [[ $arch != x86_64* ]] && [[ $arch != aarch64* ]]; then
		echo "ERROR: ISA-L cannot be used due to CPU incompatibility."
		exit 1
	fi
fi

if [[ "${CONFIG[ISAL]}" = "n" ]] && [[ "${CONFIG[REDUCE]}" = "y" ]]; then
	echo "ERROR Conflicting options: --with-reduce is not compatible with --without-isal."
	exit 1
fi

if [ -z "${CONFIG[ENV]}" ]; then
	CONFIG[ENV]=$rootdir/lib/env_dpdk
	echo "Using default SPDK env in ${CONFIG[ENV]}"
	if [[ -z "${CONFIG[DPDK_DIR]}" && "${CONFIG[DPDK_PKG_CONFIG]}" == n ]]; then
		if [ ! -f "$rootdir"/dpdk/config/meson.build ]; then
			echo "DPDK not found; please specify --with-dpdk=<path> or run:"
			echo
			echo "  git submodule update --init"
			exit 1
		else
			CONFIG[DPDK_DIR]="${rootdir}/dpdk/build"
			# Default ipsec libs
			if [[ "${CONFIG[CRYPTO]}" = "y" ]]; then
				CONFIG[IPSEC_MB]=y
				CONFIG[IPSEC_MB_DIR]="${rootdir}/intel-ipsec-mb/lib"
			fi
			echo "Using default DPDK in ${CONFIG[DPDK_DIR]}"
		fi
	fi
else
	if [[ -n "${CONFIG[DPDK_DIR]}" || "${CONFIG[DPDK_PKG_CONFIG]}" == y ]]; then
		echo "--with-env and --with-dpdk are mutually exclusive."
		exit 1
	fi

	if [ "${CONFIG[VHOST]}" = "y" ]; then
		echo "Vhost is only supported when using the default DPDK environment. Disabling it."
	fi
	# Always disable vhost, but only print the error message if the user explicitly turned it on.
	CONFIG[VHOST]="n"
	if [ "${CONFIG[VIRTIO]}" = "y" ]; then
		echo "Virtio is only supported when using the default DPDK environment. Disabling it."
	fi
	# Always disable virtio, but only print the error message if the user explicitly turned it on.
	CONFIG[VIRTIO]="n"
fi

if [[ "${CONFIG[DPDK_PKG_CONFIG]}" == y ]]; then
	if [[ "${CONFIG[SHARED]}" == n ]]; then
		# dpdk-devel doesn't provide static libs
		echo "Build against packaged DPDK requested, enabling shared libraries"
		CONFIG[SHARED]=y
	fi
fi

if [[ $sys_name == "Windows" ]]; then
	if [ -z "${CONFIG[WPDK_DIR]}" ]; then
		if [ ! -f "$rootdir"/wpdk/Makefile ]; then
			echo "WPDK not found; please specify --with-wpdk=<path>. See https://wpdk.github.io."
			exit 1
		else
			CONFIG[WPDK_DIR]="${rootdir}/wpdk/build"
			echo "Using default WPDK in ${CONFIG[WPDK_DIR]}"
		fi
	fi
else
	if [ -n "${CONFIG[WPDK_DIR]}" ]; then
		echo "ERROR: --with-wpdk is only supported for Windows"
		exit 1
	fi
fi

if [ "${CONFIG[VTUNE]}" = "y" ]; then
	if [ -z "${CONFIG[VTUNE_DIR]}" ]; then
		echo "When VTune is enabled, you must specify the VTune directory using --with-vtune=path"
		exit 1
	fi
fi

if [[ "${CONFIG[ASAN]}" = "y" && "${CONFIG[TSAN]}" = "y" ]]; then
	echo "ERROR: ASAN and TSAN cannot be enabled at the same time."
	exit 1
fi

if [[ "${CONFIG[FIO_PLUGIN]}" = "y" && "${CONFIG[EXAMPLES]}" = "n" ]]; then
	echo "ERROR: --with-fio and --disable-examples are mutually exclusive."
	exit 1
fi

if [[ $sys_name == "FreeBSD" ]]; then
	# FreeBSD doesn't support all configurations
	if [[ "${CONFIG[COVERAGE]}" == "y" ]]; then
		echo "ERROR: CONFIG_COVERAGE not available on FreeBSD"
		exit 1
	fi
fi

if [[ $sys_name != "Linux" ]]; then
	if [[ "${CONFIG[VHOST]}" == "y" ]]; then
		echo "Vhost is only supported on Linux."
		exit 1
	fi
	if [[ "${CONFIG[VIRTIO]}" == "y" ]]; then
		echo "Virtio is only supported on Linux."
		exit 1
	fi
fi

if [ "${CONFIG[RDMA]}" = "y" ]; then
	if [[ ! "${CONFIG[RDMA_PROV]}" == "verbs" ]] && [[ ! "${CONFIG[RDMA_PROV]}" == "mlx5_dv" ]]; then
		echo "Invalid RDMA provider specified, must be \"verbs\" or \"mlx5_dv\""
		exit 1
	fi

	if ! echo -e '#include <infiniband/verbs.h>\n#include <rdma/rdma_verbs.h>\n' \
		'int main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -libverbs -lrdmacm - 2> /dev/null; then
		echo "--with-rdma requires libverbs and librdmacm."
		echo "Please install then re-run this script."
		exit 1
	fi

	if echo -e '#include <infiniband/verbs.h>\n' \
		'int main(void) { return !!IBV_WR_SEND_WITH_INV; }\n' \
		| "${BUILD_CMD[@]}" -c - 2> /dev/null; then
		CONFIG[RDMA_SEND_WITH_INVAL]="y"
	else
		CONFIG[RDMA_SEND_WITH_INVAL]="n"
		echo "
*******************************************************************************
WARNING: The Infiniband Verbs opcode Send With Invalidate is either not
supported or is not functional with the current version of libibverbs installed
on this system. Please upgrade to at least version 1.1.

Beginning with Linux kernel 4.14, the kernel NVMe-oF initiator leverages Send
With Invalidate RDMA operations to improve performance. Failing to use the
Send With Invalidate operation on the NVMe-oF target side results in full
functionality, but greatly reduced performance. The SPDK NVMe-oF target will
be unable to leverage that operation using the currently installed version
of libibverbs, so Linux kernel NVMe-oF initiators based on kernels greater
than or equal to 4.14 will see significantly reduced performance.
*******************************************************************************"
	fi

	if echo -e '#include <rdma/rdma_cma.h>\n' \
		'int main(void) { return !!RDMA_OPTION_ID_ACK_TIMEOUT; }\n' \
		| "${BUILD_CMD[@]}" -c - 2> /dev/null; then
		CONFIG[RDMA_SET_ACK_TIMEOUT]="y"
	else
		CONFIG[RDMA_SET_ACK_TIMEOUT]="n"
		echo "RDMA_OPTION_ID_ACK_TIMEOUT is not supported"
	fi

	if [ "${CONFIG[RDMA_PROV]}" == "mlx5_dv" ]; then
		if ! echo -e '#include <spdk/stdinc.h>\n' \
			'#include <infiniband/mlx5dv.h>\n' \
			'#include <rdma/rdma_cma.h>\n' \
			'int main(void) { return rdma_establish(NULL) || ' \
			'!!IBV_QP_INIT_ATTR_SEND_OPS_FLAGS || !!MLX5_OPCODE_RDMA_WRITE; }\n' \
			| "${BUILD_CMD[@]}" -lmlx5 -I${rootdir}/include -c - 2> /dev/null; then
			echo "mlx5_dv provider is not supported"
			exit 1
		fi
	fi

	echo "Using '${CONFIG[RDMA_PROV]}' RDMA provider"
fi

if [[ "${CONFIG[FC]}" = "y" ]]; then
	if [[ -n "${CONFIG[FC_PATH]}" ]]; then
		if [ ! -d "${CONFIG[FC_PATH]}" ]; then
			echo "${CONFIG[FC_PATH]}: directory not found"
			exit 1
		fi
	fi
fi

if [[ "${CONFIG[ISAL]}" = "y" ]] || [[ "${CONFIG[CRYPTO]}" = "y" ]]; then
	if [[ "${HAVE_NASM}" = "n" ]] && [[ $arch == x86_64* ]]; then
		echo "ERROR: ISA-L, compression & crypto require NASM version 2.14 or newer."
		echo "Please install or upgrade them re-run this script."
		exit 1
	fi
fi

if [[ "${CONFIG[PMDK]}" = "y" ]]; then
	if ! echo -e '#include <libpmemblk.h>\nint main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -lpmemblk - 2> /dev/null; then
		echo "--with-pmdk requires libpmemblk."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

function dpdk_version() {
	# Check DPDK version to determine if mlx5_pci driver is supported
	local dpdk_ver="none"
	if [[ "${CONFIG[DPDK_DIR]}" == "$rootdir/dpdk/build" ]]; then
		# DPDK_DIR points at our submodule so ./build may not exist yet. Use
		# absolute path to lookup the version.
		dpdk_ver=$(< "$rootdir/dpdk/VERSION")
	elif [[ -f "${CONFIG[DPDK_DIR]}"/../VERSION ]]; then
		dpdk_ver=$(< "${CONFIG[DPDK_DIR]}"/../VERSION)
	fi
	echo $dpdk_ver
}

function mlx5_build() {
	# Check if libmlx5 exists to enable mlx5_pci compress/crypto PMD
	if ! echo -e '#include <spdk/stdinc.h>\n' \
		'#include <infiniband/mlx5dv.h>\n' \
		'#include <infiniband/verbs.h>\n' \
		'int main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -lmlx5 -libverbs -I${rootdir}/include -c - 2> /dev/null; then
		return 1
	fi
	return 0
}

if [[ "${CONFIG[REDUCE]}" = "y" ]]; then
	if ! echo -e '#include <libpmem.h>\nint main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -lpmem - 2> /dev/null; then
		echo "--with-reduce requires libpmem."
		echo "Please install then re-run this script."
		exit 1
	fi
	# Try to enable mlx5 compress
	CONFIG[REDUCE_MLX5]="y"

	# Check if libmlx5 exists to enable mlx5_pci compress PMD
	if ! mlx5_build; then
		echo "libmlx5 is not found, so disabling DPDK mlx5_pci compress PMD"
		CONFIG[REDUCE_MLX5]="n"
	else
		if [[ "${CONFIG[DPDK_PKG_CONFIG]}" = "y" ]]; then
			# Check if librte_compress_mlx5 exists in DPDK package
			if [ ! -f "${CONFIG[DPDK_LIB_DIR]}"/librte_compress_mlx5.so ]; then
				echo "librte_compress_mlx5 is not found, so disabling DPDK mlx5_pci compress PMD"
				CONFIG[REDUCE_MLX5]="n"
			fi
		else
			# Check DPDK version to determine if mlx5_pci driver is supported
			dpdk_ver=$(dpdk_version)
			if [[ $dpdk_ver = "none" ]]; then
				echo "Cannot get DPDK version, so disabling DPDK mlx5_pci compress PMD"
				CONFIG[REDUCE_MLX5]="n"
			elif [[ -n $dpdk_ver ]] && lt "$dpdk_ver" 21.02.0; then
				# mlx5_pci for compress is supported by DPDK >- 21.02.0
				echo "DPDK version ${dpdk_ver} doesn't support mlx5_pci compress PMD"
				CONFIG[REDUCE_MLX5]="n"
			elif [[ -n ${CONFIG[DPDK_LIB_DIR]} ]] && [ ! -f "${CONFIG[DPDK_LIB_DIR]}"/librte_compress_mlx5.so ]; then
				# This is only checked when --with-dpdk or --with-dpdk=* is used
				echo "librte_compress_mlx5 is not found, so disabling DPDK mlx5_pci compress PMD"
				CONFIG[REDUCE_MLX5]="n"
			fi
		fi
	fi
fi

if [[ "${CONFIG[CRYPTO]}" = "y" ]]; then
	# Try to enable mlx5 crypto
	CONFIG[CRYPTO_MLX5]="y"

	# Check if libmlx5 exists to enable mlx5_pci compress PMD
	if ! mlx5_build; then
		echo "libmlx5 is not found, so disabling DPDK mlx5_pci crypto PMD"
		CONFIG[CRYPTO_MLX5]="n"
	else
		if [[ "${CONFIG[DPDK_PKG_CONFIG]}" = "y" ]]; then
			# Check if librte_crypto_mlx5 exists in DPDK package
			if [ ! -f "${CONFIG[DPDK_LIB_DIR]}"/librte_crypto_mlx5.so ]; then
				echo "librte_crypto_mlx5 is not found, so disabling DPDK mlx5_pci crypto PMD"
				CONFIG[CRYPTO_MLX5]="n"
			fi
		else
			# Check DPDK version to determine if mlx5_pci driver is supported
			dpdk_ver=$(dpdk_version)
			if [[ $dpdk_ver = "none" ]]; then
				echo "Cannot get DPDK version, so disabling DPDK mlx5_pci crypto PMD"
				CONFIG[CRYPTO_MLX5]="n"
			elif [[ -n $dpdk_ver ]] && lt "$dpdk_ver" 21.11.0; then
				# mlx5_pci for crypto is supported by DPDK >- 21.11.0
				echo "DPDK version ${dpdk_ver} doesn't support mlx5_pci crypto PMD"
				CONFIG[CRYPTO_MLX5]="n"
			elif [[ -n ${CONFIG[DPDK_LIB_DIR]} ]] && [ ! -f "${CONFIG[DPDK_LIB_DIR]}"/librte_crypto_mlx5.so ]; then
				# This is only checked when --with-dpdk or --with-dpdk=* is used
				echo "librte_crypto_mlx5 is not found, so disabling DPDK mlx5_pci crypto PMD"
				CONFIG[CRYPTO_MLX5]="n"
			fi
		fi
	fi
fi

if [[ "${CONFIG[NVME_CUSE]}" = "y" ]]; then
	if ! echo -e '#define FUSE_USE_VERSION 31\n#include <fuse3/cuse_lowlevel.h>\n#include <fuse3/fuse_lowlevel.h>\n#include <fuse3/fuse_opt.h>\nint main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -lfuse3 -D_FILE_OFFSET_BITS=64 - 2> /dev/null; then
		echo "--with-cuse requires libfuse3."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

if [[ "${CONFIG[RBD]}" = "y" ]]; then
	if ! echo -e '#include <rbd/librbd.h>\n#include <rados/librados.h>\n' \
		'int main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -lrados -lrbd - 2> /dev/null; then
		echo "--with-rbd requires librados and librbd."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

if [[ "${CONFIG[ISCSI_INITIATOR]}" = "y" ]]; then
	# Fedora installs libiscsi to /usr/lib64/iscsi for some reason.
	if ! echo -e '#include <iscsi/iscsi.h>\n#include <iscsi/scsi-lowlevel.h>\n' \
		'#if LIBISCSI_API_VERSION < 20150621\n' \
		'#error\n' \
		'#endif\n' \
		'int main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -L/usr/lib64/iscsi -liscsi - 2> /dev/null; then
		echo "--with-iscsi-initiator requires libiscsi with"
		echo "LIBISCSI_API_VERSION >= 20150621."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

if [[ "${CONFIG[ASAN]}" = "y" ]]; then
	if ! echo -e 'int main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -fsanitize=address - 2> /dev/null; then
		echo "--enable-asan requires libasan."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

if [[ "${CONFIG[UBSAN]}" = "y" ]]; then
	if ! echo -e 'int main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -fsanitize=undefined - 2> /dev/null; then
		echo "--enable-ubsan requires libubsan."
		echo "Please install then re-run this script."
		echo "If installed, please check that the GCC version is at least 6.4"
		echo "and synchronize CC accordingly."
		exit 1
	fi
fi

if [[ "${CONFIG[TSAN]}" = "y" ]]; then
	if ! echo -e 'int main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -fsanitize=thread - 2> /dev/null; then
		echo "--enable-tsan requires libtsan."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

if [[ "${CONFIG[OCF]}" = "y" ]]; then
	# If OCF_PATH is a file, assume it is a library and use it to compile with
	if [ -f ${CONFIG[OCF_PATH]} ]; then
		CONFIG[CUSTOMOCF]=y
	else
		CONFIG[CUSTOMOCF]=n
	fi
fi

if [[ "${CONFIG[PGO_CAPTURE]}" = "y" && "${CONFIG[PGO_USE]}" = "y" ]]; then
	echo "ERROR: --enable-pgo-capture and --enable-pgo-use are mutually exclusive."
	exit 1
elif [[ "${CONFIG[PGO_USE]}" = "y" ]]; then
	if [[ "$CC_TYPE" = "clang" ]]; then
		# For clang we need to run an extra step on gathered profiling data.
		echo "Generating suitable profile data"
		llvm-profdata merge -output=build/pgo/default.profdata build/pgo
	fi
fi

if [[ "${CONFIG[URING]}" = "y" ]]; then
	if [[ -n "${CONFIG[URING_PATH]}" ]]; then
		if [ ! -d "${CONFIG[URING_PATH]}" ]; then
			echo "${CONFIG[URING_PATH]}: directory not found"
			exit 1
		fi
	elif ! echo -e '#include <liburing.h>\nint main(void) { return 0; }\n' \
		| "${BUILD_CMD[@]}" -luring - 2> /dev/null; then
		echo "--with-uring requires liburing."
		echo "Please build and install then re-run this script."
		exit 1
	fi
fi

if [[ "${CONFIG[FUSE]}" = "y" ]]; then
	if [[ ! -d /usr/include/fuse3 ]] && [[ ! -d /usr/local/include/fuse3 ]]; then
		echo "--with-fuse requires libfuse3."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

if [ "${CONFIG[CET]}" = "y" ]; then
	if ! echo -e 'int main(void) { return 0; }\n' | "${BUILD_CMD[@]}" -fcf-protection - 2> /dev/null; then
		echo "--enable-cet requires compiler/linker that supports CET."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

if [[ "${CONFIG[FUZZER]}" = "y" && "$CC_TYPE" != "clang" ]]; then
	echo "--with-fuzzer requires setting CC and CXX to clang."
	exit 1
fi

if [[ "${CONFIG[ISAL]}" = "y" ]]; then
	if [ ! -f "$rootdir"/isa-l/autogen.sh ]; then
		echo "ISA-L was not found; To install ISA-L run:"
		echo "  git submodule update --init"
		exit 1
	fi

	cd $rootdir/isa-l
	ISAL_LOG=$rootdir/isa-l/spdk-isal.log
	if [[ -n "${CONFIG[CROSS_PREFIX]}" ]]; then
		ISAL_OPTS=("--host=${CONFIG[CROSS_PREFIX]}")
	else
		ISAL_OPTS=()
	fi
	echo -n "Configuring ISA-L (logfile: $ISAL_LOG)..."
	./autogen.sh &> $ISAL_LOG
	./configure CFLAGS="-fPIC -g -O2" "${ISAL_OPTS[@]}" --enable-shared=no >> $ISAL_LOG 2>&1
	echo "done."
	cd $rootdir
fi

if [[ "${CONFIG[SMA]}" = "y" ]]; then
	if ! python3 -c 'import grpc; import grpc_tools' 2> /dev/null; then
		echo "--with-sma requires grpcio and grpcio-tools python packages."
		echo "Please install then re-run this script."
		exit 1
	fi
fi

# For ARM Neoverse-N1 platform, debug build needs gcc version newer than 8.4
if [[ "${CONFIG[DEBUG]}" = "y" && $arch = aarch64* && "$CC_TYPE" = "gcc" ]]; then
	GCC_VERSION=$($CC -dumpfullversion)
	PART_NUM=$(grep -i -m 1 "CPU part" /proc/cpuinfo | awk '{print $4}')

	if [[ "$(printf '%s\n' "8.4.0" "$GCC_VERSION" | sort -V | head -n1)" != "8.4.0" ]]; then
		if [[ $PART_NUM = 0xd0c ]]; then
			echo "WARNING: For ARM Neoverse-N1 platform, debug build needs GCC version newer than 8.4."
			echo "         Will work around this by using armv8.2-a+crypto as target architecture for now."
			CONFIG[ARCH]=armv8.2-a+crypto
		fi
	fi
fi

# We are now ready to generate final configuration. But first do sanity
# check to see if all keys in CONFIG array have its reflection in CONFIG file.
if (($(grep -cE "^\s*CONFIG_[[:alnum:]_]+=" "$rootdir/CONFIG") != ${#CONFIG[@]})); then
	echo ""
	echo "BUG: Some configuration options are not present in CONFIG file. Please update this file."
	echo "Missing options in CONFIG (+) file and in current config (-): "
	diff -u --label "CONFIG file" --label "CONFIG[@]" \
		<(sed -r -e '/^[[:space:]]*$/d; /^[[:space:]]*#.*/d; s/(CONFIG_[[:alnum:]_]+)=.*/\1/g' CONFIG | sort) \
		<(printf "CONFIG_%s\n" "${!CONFIG[@]}" | sort)
	exit 1
fi

echo -n "Creating mk/config.mk..."
cp -f $rootdir/CONFIG $rootdir/mk/config.mk
for key in "${!CONFIG[@]}"; do
	sed -i.bak -r "s#[[:space:]]*CONFIG_${key}=.*#CONFIG_${key}\?=${CONFIG[$key]}#g" $rootdir/mk/config.mk
done
# On FreeBSD sed -i 'SUFFIX' - SUFFIX is mandatory. So no way but to delete the backed file.
rm -f $rootdir/mk/config.mk.bak
echo "done."

# Environment variables
echo -n "Creating mk/cc.flags.mk..."
rm -f $rootdir/mk/cc.flags.mk
[ -n "$CFLAGS" ] && echo "CFLAGS?=$CFLAGS" > $rootdir/mk/cc.flags.mk
[ -n "$CXXFLAGS" ] && echo "CXXFLAGS?=$CXXFLAGS" >> $rootdir/mk/cc.flags.mk
[ -n "$LDFLAGS" ] && echo "LDFLAGS?=$LDFLAGS" >> $rootdir/mk/cc.flags.mk
[ -n "$DESTDIR" ] && echo "DESTDIR?=$DESTDIR" >> $rootdir/mk/cc.flags.mk
echo "done."

# Create .sh with build config for easy sourcing|lookup during the tests.
for conf in "${!CONFIG[@]}"; do
	echo "CONFIG_$conf=${CONFIG[$conf]}"
done > "$rootdir/test/common/build_config.sh"

if [[ $sys_name == "FreeBSD" ]]; then
	echo "Type 'gmake' to build."
else
	echo "Type 'make' to build."
fi

exit 0