configure

#!/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 ""
	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 " dpdk                      Build against a custom dpdk version. By default, the dpdk"
	echo "                           submodule in spdk tree will be used."
	echo "                           example: /usr/share/dpdk/x86_64-default-linuxapp-gcc"
	echo " env                       Use an alternate environment implementation instead of DPDK."
	echo "                           Implies --without-dpdk."
	echo " idxd                      Build the IDXD library and accel framework plug-in module."
	echo "                           Disabled while experimental. Only built for x86 when enabled."
	echo " crypto                    Build vbdev crypto module."
	echo "                           No path required."
	echo " fio                       Build fio_plugin."
	echo "                           default: /usr/src/fio"
	echo " vhost                     Build vhost target. Enabled by default."
	echo "                           No path required."
	echo " virtio                    Build vhost initiator and virtio-pci bdev modules."
	echo "                           No path required."
	echo " vfio-user                 Build custom vfio-user transport for NVMf target and NVMe initiator."
	echo "                           example: /usr/src/libvfio-user"
	echo " pmdk                      Build persistent memory bdev."
	echo "                           example: /usr/share/pmdk"
	echo " reduce                    Build vbdev compression module."
	echo "                           No path required."
	echo " rbd                       Build Ceph RBD bdev module."
	echo "                           No path required."
	echo " rdma                      Build RDMA transport for NVMf target and initiator."
	echo "                           Accepts optional RDMA provider name. Can be \"verbs\" or \"mlx5_dv\"."
	echo "                           If no provider specified, \"verbs\" provider is used by default."
	echo " fc                        Build FC transport for NVMf target."
	echo "                           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 " shared                    Build spdk shared libraries."
	echo "                           No path required."
	echo " iscsi-initiator           Build with iscsi bdev module."
	echo "                           No path required."
	echo " vtune                     Required to profile I/O under Intel VTune Amplifier XE."
	echo "                           example: /opt/intel/vtune_amplifier_xe_version"
	echo " ocf                       Build OCF library and bdev module."
	echo "                           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 " isal                      Build with ISA-L. Enabled by default on x86 and aarch64 architectures."
	echo "                           No path required."
	echo " uring                     Build I/O uring bdev or socket module."
	echo "                           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 " fuse                      Build FUSE components for mounting a blobfs filesystem."
	echo "                           No path required."
	echo " nvme-cuse                 Build NVMe driver with support for CUSE-based character devices."
	echo "                           No path required."
	echo " raid5                     Build with bdev_raid module RAID5 support."
	echo "                           No path required."
	echo " wpdk                      Build using WPDK to provide support for Windows (experimental)."
	echo "                           The argument must be a directory containing lib and include."
	echo " usdt                      Build with userspace DTrace probes enabled."
	echo "                           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 sourcable 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

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
}

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#*=}"
			;;
		--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=*)
			check_dir "$i"
			CONFIG[DPDK_DIR]=$(readlink -f ${i#*=})
			;;
		--without-dpdk)
			CONFIG[DPDK_DIR]=
			;;
		--with-wpdk=*)
			check_dir "$i"
			CONFIG[WPDK_DIR]=$(readlink -f ${i#*=})
			;;
		--with-env=*)
			CONFIG[ENV]="${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-fio) ;&
		--with-fio=*)
			if [[ ${i#*=} != "$i" ]]; then
				CONFIG[FIO_SOURCE_DIR]=$(readlink -f "${i#*=}")
			fi
			check_dir "--with-fio=${CONFIG[FIO_SOURCE_DIR]}"
			CONFIG[FIO_PLUGIN]=y
			;;
		--without-fio)
			CONFIG[FIO_PLUGIN]=n
			;;
		--with-vtune=*)
			check_dir "$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-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
			;;
		--without-idxd)
			CONFIG[IDXD]=n
			;;
		--with-usdt)
			CONFIG[USDT]=y
			;;
		--without-usdt)
			CONFIG[USDT]=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 ! bash -c "command -v cmake3 cmake" > /dev/null; then
		echo "ERROR: --with-vfio-user requires cmake"
		echo "Please install then re-run this script"
		exit 1
	fi
	if [[ ! -d /usr/include/json-c ]] && [[ ! -d /usr/local/include/json-c ]]; then
		echo "ERROR: --with-vfio-user requires json-c-devel"
		echo "Please install then re-run this script"
		exit 1
	fi
	if [[ ! -e /usr/include/cmocka.h ]] && [[ ! -e /usr/local/include/cmocka.h ]]; 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 incompatiblity."
		exit 1
	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 incompatiblity."
		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]}" ]; 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"
			echo "Using default DPDK in ${CONFIG[DPDK_DIR]}"
		fi
	fi
else
	if [ -n "${CONFIG[DPDK_DIR]}" ]; 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 [[ $sys_name == "Windows" ]]; then
	if [ -z "${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 [[ $sys_name == "FreeBSD" ]]; then
	# FreeBSD doesn't support all configurations
	if [[ "${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" ]] && [[ $arch == x86_64* ]]; then
		echo "ERROR: ISA-L, compression & crypto require NASM version 2.14 or newer."
		echo "Please install or upgrade them re-run this script."
		exit 1
	else
		if [[ "${CONFIG[CRYPTO]}" = "y" ]]; then
			CONFIG[IPSEC_MB]=y
		fi
	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

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
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 [[ "${CONFIG[ISAL]}" = "y" ]]; then
	if [ ! -f "$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

# 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