#! /bin/sh -e
# SPDX-License-Identifier: BSD-3-Clause
# Copyright(c) 2018 Intel Corporation

# Run meson to auto-configure the various builds.
# * all builds get put in a directory whose name starts with "build-"
# * if a build-directory already exists we assume it was properly configured
# Run ninja after configuration is done.

# set pipefail option if possible
PIPEFAIL=""
set -o | grep -q pipefail && set -o pipefail && PIPEFAIL=1

srcdir=$(dirname $(readlink -f $0))/..
. $srcdir/devtools/load-devel-config

MESON=${MESON:-meson}
use_shared="--default-library=shared"
builds_dir=${DPDK_BUILD_TEST_DIR:-.}

if command -v gmake >/dev/null 2>&1 ; then
	MAKE=gmake
else
	MAKE=make
fi
if command -v ninja >/dev/null 2>&1 ; then
	ninja_cmd=ninja
elif command -v ninja-build >/dev/null 2>&1 ; then
	ninja_cmd=ninja-build
else
	echo "ERROR: ninja is not found" >&2
	exit 1
fi
if command -v ccache >/dev/null 2>&1 ; then
	CCACHE=ccache
else
	CCACHE=
fi

default_path=$PATH
default_cppflags=$CPPFLAGS
default_cflags=$CFLAGS
default_ldflags=$LDFLAGS
default_meson_options=$DPDK_MESON_OPTIONS

opt_verbose=
opt_vverbose=
if [ "$1" = "-v" ] ; then
	opt_verbose=y
elif [ "$1" = "-vv" ] ; then
	opt_verbose=y
	opt_vverbose=y
fi
# we can't use plain verbose when we don't have pipefail option so up-level
if [ -z "$PIPEFAIL" -a -n "$opt_verbose" ] ; then
	echo "# Missing pipefail shell option, changing VERBOSE to VERY_VERBOSE"
	opt_vverbose=y
fi
[ -n "$opt_verbose" ] && exec 8>&1 || exec 8>/dev/null
verbose=8
[ -n "$opt_vverbose" ] && exec 9>&1 || exec 9>/dev/null
veryverbose=9

check_cc_flags () # <flag to check> <flag2> ...
{
	echo 'int main(void) { return 0; }' |
		cc $@ -x c - -o /dev/null 2> /dev/null
}

load_env () # <target compiler>
{
	targetcc=$1
	# reset variables before target-specific config
	export PATH=$default_path
	unset PKG_CONFIG_PATH # global default makes no sense
	export CPPFLAGS=$default_cppflags
	export CFLAGS=$default_cflags
	export LDFLAGS=$default_ldflags
	export DPDK_MESON_OPTIONS=$default_meson_options
	# set target hint for use in the loaded config file
	if [ -n "$target_override" ] ; then
		DPDK_TARGET=$target_override
	elif command -v $targetcc >/dev/null 2>&1 ; then
		DPDK_TARGET=$($targetcc -v 2>&1 | sed -n 's,^Target: ,,p')
	else # toolchain not yet in PATH: its name should be enough
		DPDK_TARGET=$targetcc
	fi
	echo "Using DPDK_TARGET $DPDK_TARGET" >&$verbose
	# config input: $DPDK_TARGET
	. $srcdir/devtools/load-devel-config
	# config output: $DPDK_MESON_OPTIONS, $PATH, $PKG_CONFIG_PATH, etc
	command -v $targetcc >/dev/null 2>&1 || return 1
}

config () # <dir> <builddir> <meson options>
{
	dir=$1
	shift
	builddir=$1
	shift
	if [ -f "$builddir/build.ninja" ] ; then
		# for existing environments, switch to debugoptimized if unset
		# so that ABI checks can run
		if ! $MESON configure $builddir |
				awk '$1=="buildtype" {print $2}' |
				grep -qw debugoptimized; then
			$MESON configure --buildtype=debugoptimized $builddir
		fi
		return
	fi
	options=
	if echo $* | grep -qw -- '--default-library=shared' ; then
		options="$options -Dexamples=all"
	else
		options="$options -Dexamples=l3fwd" # save disk space
	fi
	options="$options --buildtype=debugoptimized"
	for option in $DPDK_MESON_OPTIONS ; do
		options="$options -D$option"
	done
	options="$options $*"
	echo "$MESON $options $dir $builddir" >&$verbose
	$MESON $options $dir $builddir
}

compile () # <builddir>
{
	builddir=$1
	if [ -n "$opt_vverbose" ] ; then
		# for full output from ninja use "-v"
		echo "$ninja_cmd -v -C $builddir"
		$ninja_cmd -v -C $builddir
	elif [ -n "$opt_verbose" ] ; then
		# for keeping the history of short cmds, pipe through cat
		echo "$ninja_cmd -C $builddir | cat"
		$ninja_cmd -C $builddir | cat
	else
		$ninja_cmd -C $builddir
	fi
}

install_target () # <builddir> <installdir>
{
	rm -rf $2
	echo "DESTDIR=$2 $ninja_cmd -C $1 install" >&$verbose
	DESTDIR=$2 $ninja_cmd -C $1 install >&$veryverbose
}

build () # <directory> <target cc | cross file> <ABI check> [meson options]
{
	targetdir=$1
	shift
	crossfile=
	[ -r $1 ] && crossfile=$1 || targetcc=$1
	shift
	abicheck=$1
	shift
	# skip build if compiler not available
	command -v ${CC##* } >/dev/null 2>&1 || return 0
	if [ -n "$crossfile" ] ; then
		cross="--cross-file $crossfile"
		targetcc=$(sed -n 's,^c[[:space:]]*=[[:space:]]*,,p' \
			$crossfile | tr -d "'" | tr -d '"')
	else
		cross=
	fi
	load_env $targetcc || return 0
	config $srcdir $builds_dir/$targetdir $cross --werror $*
	compile $builds_dir/$targetdir
	if [ -n "$DPDK_ABI_REF_VERSION" -a "$abicheck" = ABI ] ; then
		abirefdir=${DPDK_ABI_REF_DIR:-reference}/$DPDK_ABI_REF_VERSION
		if [ ! -d $abirefdir/$targetdir ]; then
			# clone current sources
			if [ ! -d $abirefdir/src ]; then
				git clone --local --no-hardlinks \
					--single-branch \
					-b $DPDK_ABI_REF_VERSION \
					$srcdir $abirefdir/src
			fi

			rm -rf $abirefdir/build
			config $abirefdir/src $abirefdir/build $cross \
				-Dexamples= $*
			compile $abirefdir/build
			install_target $abirefdir/build $abirefdir/$targetdir
			$srcdir/devtools/gen-abi.sh $abirefdir/$targetdir

			# save disk space by removing static libs and apps
			find $abirefdir/$targetdir/usr/local -name '*.a' -delete
			rm -rf $abirefdir/$targetdir/usr/local/bin
			rm -rf $abirefdir/$targetdir/usr/local/share
		fi

		install_target $builds_dir/$targetdir \
			$(readlink -f $builds_dir/$targetdir/install)
		echo "Checking ABI compatibility of $targetdir" >&$verbose
		echo $srcdir/devtools/gen-abi.sh \
			$(readlink -f $builds_dir/$targetdir/install) >&$veryverbose
		$srcdir/devtools/gen-abi.sh \
			$(readlink -f $builds_dir/$targetdir/install) >&$veryverbose
		echo $srcdir/devtools/check-abi.sh $abirefdir/$targetdir \
			$(readlink -f $builds_dir/$targetdir/install) >&$veryverbose
		$srcdir/devtools/check-abi.sh $abirefdir/$targetdir \
			$(readlink -f $builds_dir/$targetdir/install) >&$verbose
	fi
}

# shared and static linked builds with gcc and clang
for c in gcc clang ; do
	command -v $c >/dev/null 2>&1 || continue
	for s in static shared ; do
		if [ $s = shared ] ; then
			abicheck=ABI
		else
			abicheck=skipABI # save time and disk space
		fi
		export CC="$CCACHE $c"
		build build-$c-$s $c $abicheck --default-library=$s
		unset CC
	done
done

# test compilation with minimal x86 instruction set
# Set the install path for libraries to "lib" explicitly to prevent problems
# with pkg-config prefixes if installed in "lib/x86_64-linux-gnu" later.
generic_machine='nehalem'
if ! check_cc_flags "-march=$generic_machine" ; then
	generic_machine='corei7'
fi
build build-x86-generic cc skipABI -Dcheck_includes=true \
	-Dlibdir=lib -Dmachine=$generic_machine $use_shared

# 32-bit with default compiler
if check_cc_flags '-m32' ; then
	if [ -d '/usr/lib/i386-linux-gnu' ] ; then
		# 32-bit pkgconfig on Debian/Ubuntu
		export PKG_CONFIG_LIBDIR='/usr/lib/i386-linux-gnu/pkgconfig'
	elif [ -d '/usr/lib32' ] ; then
		# 32-bit pkgconfig on Arch
		export PKG_CONFIG_LIBDIR='/usr/lib32/pkgconfig'
	else
		# 32-bit pkgconfig on RHEL/Fedora (lib vs lib64)
		export PKG_CONFIG_LIBDIR='/usr/lib/pkgconfig'
	fi
	target_override='i386-pc-linux-gnu'
	build build-32b cc ABI -Dc_args='-m32' -Dc_link_args='-m32'
	target_override=
	unset PKG_CONFIG_LIBDIR
fi

# x86 MinGW
build build-x86-mingw $srcdir/config/x86/cross-mingw skipABI \
	-Dexamples=helloworld

# generic armv8a with clang as host compiler
f=$srcdir/config/arm/arm64_armv8_linux_gcc
export CC="clang"
build build-arm64-host-clang $f ABI $use_shared
unset CC
# some gcc/arm configurations
for f in $srcdir/config/arm/arm64_[bdo]*gcc ; do
	export CC="$CCACHE gcc"
	targetdir=build-$(basename $f | tr '_' '-' | cut -d'-' -f-2)
	build $targetdir $f skipABI $use_shared
	unset CC
done

# ppc configurations
for f in $srcdir/config/ppc/ppc* ; do
	targetdir=build-$(basename $f | cut -d'-' -f-2)
	build $targetdir $f ABI $use_shared
done

# Test installation of the x86-generic target, to be used for checking
# the sample apps build using the pkg-config file for cflags and libs
load_env cc
build_path=$(readlink -f $builds_dir/build-x86-generic)
export DESTDIR=$build_path/install
install_target $build_path $DESTDIR
pc_file=$(find $DESTDIR -name libdpdk.pc)
export PKG_CONFIG_PATH=$(dirname $pc_file):$PKG_CONFIG_PATH
libdir=$(dirname $(find $DESTDIR -name librte_eal.so))
export LD_LIBRARY_PATH=$libdir:$LD_LIBRARY_PATH
examples=${DPDK_BUILD_TEST_EXAMPLES:-"cmdline helloworld l2fwd l3fwd skeleton timer"}
# if pkg-config defines the necessary flags, test building some examples
if pkg-config --define-prefix libdpdk >/dev/null 2>&1; then
	export PKGCONF="pkg-config --define-prefix"
	for example in $examples; do
		echo "## Building $example"
		[ $example = helloworld ] && static=static || static= # save disk space
		$MAKE -C $DESTDIR/usr/local/share/dpdk/examples/$example \
			clean shared $static >&$veryverbose
	done
fi
