#!/bin/sh
#
# configure [ <options> ]

# usage
#
# Prints usage.
#
usage()
{
	cat << EOF

Usage: $0 <options>
options:
  --help                      Prints out this help.
  --update                    Re-runs last configure invocation [must be given
                              as first option!]
  --bootstrap <haikuporter> <HaikuPorts cross repo> <HaikuPorts repo>
                              Prepare for a bootstrap build. No pre-built
                              packages will be used, instead they will be built
                              from the sources (in several phases).
                              <haikuporter> is the path to the haikuporter tool
                              suitable for the host platform.
                              <HaikuPorts cross repo> is the path to a checked
                              out HaikuPorts cross-compilation repository.
                              <HaikuPorts repo> is the path to a checked out
                              HaikuPorts repository.
  --build-cross-tools <arch> [ <build tools dir> ]
                              Assume cross compilation. <build tools dir>
                              defines the location of the build tools sources.
                              They will be compiled and placed in the output
                              directory under "cross-tools". The HAIKU_* tools
                              variables will be set accordingly.
                              <arch> specifies the target architecture, either
                              "x86_gcc2", "x86", "x86_64", "ppc", "m68k",
                              "arm", "arm64", "riscv64", "sparc"
                              This option and --cross-tools-prefix can be
                              specified multiple times. The first cross tools
                              specify the primary tools, the subsequent ones the
                              secondary tools (for "hybrid" images).
                              For the first --build-cross-tools the
                              <build tools dir> argument must be specified and
                              for the subsequent ones it must be omitted.
  --cross-tools-prefix <prefix>
                              Assume cross compilation. <prefix> should be a
                              path to the directory where the cross
                              compilation tools are located, plus the platform
                              prefix, e.g. "/path/to/tools/i586-pc-haiku-".
                              This overrides the HAIKU_* tool variables.
  --distro-compatibility <level>
                              The distribution's level of compatibility with
                              the official Haiku distribution. The generated
                              files will contain the respective trademarks
                              accordingly.
                              official -- the official Haiku distribution.
                              compatible -- a Haiku Compatible (tm) distro.
                              default -- any other distro (default value).
  --host-only                 Configure for building tools for the build host
                              only. Haiku cannot be built when configured like
                              this.
  --include-sources           Includes the source code of projects that require
                              either an offer of source code or a copy of the
                              patched sources. This is preferable when
                              distributing on physical mediums.
  --include-3rdparty          Include 3rdparty/ in the build system.
  -j<n>                       Only relevant for --build-cross-tools. Is passed
                              on to the make building the build tools.
  --no-downloads              Do not download anything. Useful when trying to
                              bootstrap and build Haiku from source only.
  --target-arch <arch>        Haiku only: Specify the target architecture to
                              build for. Must be one of the architectures of the
                              host system. The installed build tools for that
                              architecture will be used.
                              This option can be specified multiple times. The
                              first occurrence specifies the primary
                              architecture of the Haiku to build, subsequent
                              ones the secondary architectures.
  --use-clang <arch>          Build with host Clang instead of GCC cross
                              compiler, targeting <arch>
  --use-gcc-pipe              Build with GCC option -pipe. Speeds up the build
                              process, but uses more memory.
  --use-gcc-graphite          Build with GCC Graphite engine for loop
                              optimizations. (Only for GCC 4+.)
  --use-32bit                 Use -m32 flag on 64bit host gcc compiler.
  --no-full-xattr             Do not use Linux/*BSD/Darwin's native extended file
                              attributes as Haiku attributes. If they are still
                              available, they will be used to store hashes for
                              the attribute emulation layer.
  --no-xattr                  Do not use Linux/*BSD/Darwin's native extended file
                              attributes for Haiku extended attributes at all,
                              even if they are available.
  --with-gdb <gdb sources dir>
                              specify the path to a GDB source dir, to build
                              GDB for each arch we build the cross-tools for.

environment variables:
  CC                          The host compiler. Defaults to "gcc".
  HAIKU_AR_<arch>             The static library archiver for <arch>.
                              Defaults to "ar".
  HAIKU_CC_<arch>             The compiler for <arch>. Defaults to "gcc".
  HAIKU_LD_<arch>             The <arch> linker. Defaults to "ld".
  HAIKU_OBJCOPY_<arch>        The <arch> objcopy to be used. Defaults to
                              "objcopy".
  HAIKU_RANLIB_<arch>         The static library indexer for <arch>. Defaults
                              to "ranlib".
  HAIKU_STRIP_<arch>          The <arch> strip command. Defaults to "strip".
  HAIKU_NASM                  The nasm assembler (x86 and x86_64 only).
  HAIKU_CPPFLAGS_<arch>       The preprocessor flags for target architecture
                              <arch>. Defaults to "".
  HAIKU_CCFLAGS_<arch>        The C flags for target architecture <arch>.
                              Defaults to "".
  HAIKU_CXXFLAGS_<arch>       The C++ flags for target architecture <arch>.
                              Defaults to "".
  HAIKU_LINKFLAGS_<arch>      The flags passed to the compiler when linking for
                              target architecture <arch>. Defaults to "".
  HAIKU_LDFLAGS_<arch>        The linker flags for target architecture <arch>.
                              Defaults to "".
  HAIKU_ARFLAGS_<arch>        The flags passed to HAIKU_AR for target
                              architecture <arch> for archiving. Defaults to
                              "cru".
  HAIKU_UNARFLAGS_<arch>      The flags passed to HAIKU_AR for target
                              architecture <arch> for unarchiving. Defaults to
                              "x".

Non-default output directories:
  By default all objects, build configuration, and other related files are
  stored in /path/to/haiku_source/generated.  To store objects in a non-default
  location, run "../../relative/path/to/haiku_source/configure <options>" from
  within your non-default location.  "jam [ options ] targets" can then be run
  directly inside your non-default location.  Another option is to invoke "jam
  [ options ] targets" from within haiku_source.  This can be accomplished by
  either "export HAIKU_OUTPUT_DIR=your non-default location" before invoking
  jam or by creating a symlink of haiku_source/generated pointing to your
  non-default location and running jam.


EOF
}

# assertparam
#
# Checks whether at least one parameter is left.
#
assertparam()
{
	if [ $2 -lt 2 ]; then
		echo $0: \`$1\': Parameter expected.
		exit 1
	fi
}

# assertparams
#
# Checks whether at least a certain number of parameters is left.
#
assertparams()
{
	if [ $3 -le $2 ]; then
		echo $0: \`$1\': Not enough parameters.
		exit 1
	fi
}

# absolute_path
#
# returns the absolute path of a given path.
#
absolute_path()
{
	if [ "x$1" != "x${1#/}" ]; then
		echo "$1"
	else
		echo "`pwd`/$1"
	fi
}

# check_dir_exists
#
# check if a directory exists or not
#
check_dir_exists()
{
	if [ -d "$1" ]; then
		return 0
	else
		return 1
	fi
}

# check_file_exists
#
# check if a file exists or not
#
check_file_exists()
{
	if [ -f "$1" ]; then
		return 0
	else
		return 1
	fi
}

# real_path
#
# returns the realpath of a symbolic link.
#
real_path()
{
	perl -MCwd=realpath -e'print realpath($ARGV[0]), "\n"' "$1"
}

# relative_to
#
# returns $1 relative to $2
#
relative_to()
{
	perl -e 'use File::Spec; print File::Spec->abs2rel(@ARGV) . "\n"' \
		"$1" "$2"
}

# valid_toolchain
#
# check if a toolchain is valid
#
valid_toolchain()
{
	TRIPLET="$1"
	BASE="$2"
	SOURCE="$3"
	if [ ! -d "$BASE" ]; then
		return 1
	fi
	if [ -f "$BASE/bin/$TRIPLET-gcc" ]; then
		[ "$BASE/bin/$TRIPLET-gcc" -nt "$SOURCE/legacy/gcc/configure" ] && \
			[ "$BASE/bin/$TRIPLET-gcc" -nt "$SOURCE/gcc/gcc/configure" ]
		return $?
	fi
	return 1
}

# standard_gcc_settings
#
# Sets the variables for a GCC platform.
#
standard_gcc_settings()
{
	local gcc="$1"

	if which greadlink > /dev/null 2>&1; then
		readlink="greadlink -e"
	elif which realpath > /dev/null 2>&1; then
		readlink=realpath
	elif readlink -e / > /dev/null 2>&1; then
		readlink="readlink -e"
	else
		readlink=real_path
	fi

	# PLATFORM_LINKLIBS
	local gcclib=`$gcc -print-libgcc-file-name`
	local gccdir=`dirname ${gcclib}`

	local gccRawVersion=`$gcc -dumpversion`
	local gccMachine=`$gcc -dumpmachine`

	# determine architecture from machine triple
	case $gccMachine in
		arm-*)		targetCpu=arm;;
		arm64-*)	targetCpu=arm64;;
		i?86-*)		targetCpu=x86;;
		m68k-*)		targetCpu=m68k;;
		powerpc-*)	targetCpu=ppc;;
		riscv64-*)	targetCpu=riscv64;;
		sparc64-*)	targetCpu=sparc;;
		x86_64-*)	targetCpu=x86_64;;
		*)
			echo "Unsupported gcc target machine: $gccMachine" >&2
			exit 1
			;;
	esac

	local targetArch=$targetCpu

	case $gccRawVersion in
		2.9*)
			# check for correct (most up-to-date) legacy compiler and complain
			# if an older one is installed
			if [ $gccRawVersion != $haikuRequiredLegacyGCCVersion ]; then
				echo "GCC version $haikuRequiredLegacyGCCVersion is required!";
				echo "Please download it from www.haiku-os.org...";
				exit 1;
			fi

			targetArch=x86_gcc2
			;;
	esac

	local bootLibgcc
	local bootLibSupCxx
	local bootCxxHeaders
	case $gccMachine in
		x86_64-*)
			# Boot loader is 32-bit, need the 32-bit libs and c++ config
			bootLibgcc=`$gcc -m32 -print-file-name=libgcc.a`
			bootLibSupCxx=`$gcc -m32 -print-file-name=libsupc++.a`

			local headersBase=$gccdir/../../../..
			local headers=$headersBase/$gccMachine/include/c++/$gccRawVersion
			if [ ! -d $headers ]; then
				headers=$headersBase/include/c++/$gccRawVersion
			fi
			bootCxxHeaders="$headers/$gccMachine/32"
			;;
	esac

	# determine whether graphite loop optimization should/can be used
	local useGraphite=`get_variable HAIKU_USE_GCC_GRAPHITE_$targetCpu`
	if [ -z "$useGraphite" ]; then
		useGraphite=$useGccGraphiteDefault
	fi

	if [ "$useGraphite" != 0 ]; then
		UNUSED=`echo "int main() {}" | $gcc -xc -c -floop-block - 2>&1`
		if [ $? != 0 ]; then
			echo "GCC Graphite loop optimizations cannot be used on $targetArch"
			useGraphite=0
		fi
	fi

	set_variable HAIKU_CPU_$targetArch $targetCpu

	get_build_tool_path CC_$targetArch "$gcc"
	set_variable HAIKU_CC_IS_CLANG_$targetArch $useClang
	set_variable HAIKU_GCC_RAW_VERSION_$targetArch $gccRawVersion
	set_variable HAIKU_GCC_MACHINE_$targetArch $gccMachine
	set_variable HAIKU_GCC_LIB_DIR_$targetArch $gccdir
	set_variable HAIKU_BOOT_CXX_HEADERS_DIR_$targetArch "$bootCxxHeaders"
	set_variable HAIKU_BOOT_LIBSUPCXX_$targetArch "$bootLibSupCxx"
	set_variable HAIKU_BOOT_LIBGCC_$targetArch $bootLibgcc
	set_variable HAIKU_USE_GCC_GRAPHITE_$targetArch $useGraphite

	standard_gcc_settings_targetArch=$targetArch
}

# set_variable
#
# Set the value of a variable.
#
set_variable()
{
	eval "$1=\"$2\""
}

# get_variable
#
# Echo the value of a variable.
#
get_variable()
{
	eval "echo \${$1}"
}

# set_default_value
#
# Set the value for a variable, if no value is set yet.
#
set_default_value()
{
	eval "$1=\${$1-$2}"
}

# get_build_tool_path
#
# Gets a usable absolute path of a build tool.
#
get_build_tool_path()
{
	local var="HAIKU_$1"
	local varval="`get_variable $var`"
	local cmd="$2"

	if [ ! -z "$varval" ]; then
		# this variable is already set (probably by user) so grab its contents
		cmd=$varval
	fi

	local path=${cmd%% *}

	if [ -f "$path" ]; then
		# get absolute path from relative path
		local oldPwd="`pwd`"
		cd "`dirname "$path"`"
		path="`pwd`/`basename "$path"`"
		cd $oldPwd
	else
		which "$path" > /dev/null 2>&1 || {
			echo "Build tool \"$path\" not found (maybe specify it in $var?)" >&2
			exit 1
		}
	fi

	if test "${cmd#* }" != "$cmd"; then
		# $cmd contains arguments, so preserve them (and only them)
		cmd=${cmd#* }
	else
		# $cmd does not contain arguments, so unset it
		cmd=
	fi
	eval "$var=\"$path $cmd\""
}

# check_native_xattrs
#
# Checks the host platform's support for extended attributes.
# 0: no support, 1: only enough for xattr-ref, 2: full support
#
check_native_xattrs()
{
	local xattr_set=
	local xattr_set_args=
	local xattr_get=
	local xattr_get_args=
	case $HOST_PLATFORM in
		haiku_host)
			xattr_set="addattr"; xattr_set_args="\$NAME \"\$VALUE\""
			xattr_get="catattr"; xattr_get_args="\$NAME"
			;;
		darwin)
			xattr_set="xattr"; xattr_set_args="-w \$NAME \"\$VALUE\""
			xattr_get="xattr"; xattr_get_args="-p \$NAME"
			;;
		freebsd)
			xattr_set="setextattr"; xattr_set_args="user \$NAME \"\$VALUE\""
			xattr_get="getextattr"; xattr_get_args="user \$NAME"
			;;
		linux)
			xattr_set="setfattr"; xattr_set_args="-n user.\$NAME -v \"\$VALUE\""
			xattr_get="getfattr"; xattr_get_args="-n user.\$NAME"
			;;
		*)
			return 0
			;;
	esac
	if ! type $xattr_set >/dev/null 2>&1; then
		echo "$0: could not find $xattr_set, assuming host has no extended attributes"
		return 0
	elif ! type $xattr_get >/dev/null 2>&1; then
		echo "$0: could not find $xattr_get, assuming host has no extended attributes"
		return 0
	fi

	mkdir -p "$outputDir"
	echo "xattr test file" >"$outputDir/xattrtest"
	local i=0
	# on round 0, we test if we can set 3 attrs of 1K each (enough for xattr-ref)
	# on round 1, we test if we can set 3 attrs of 45K each (enough for full xattr)
	while [ $i -lt 2 ]; do
		local j=0
		while [ $j -lt 3 ]; do
			NAME=attr$j
			VALUE=`printf '%*s' $((1024 + $i * 45056)) "" | tr ' ' x`
			if [ `echo -n $VALUE | wc -c` -lt $((1024 + $i * 45056)) ]; then
				echo "$0: warning: could not generate test data for extended attributes"
				rm "$outputDir/xattrtest"
				return $i
			elif ! $xattr_set `eval echo \"$xattr_set_args\"` \
					"$outputDir/xattrtest" >/dev/null 2>&1 ; then
				rm "$outputDir/xattrtest"
				return $i
			fi
			j=$((j+1))
		done
		i=$((i+1))
	done
	rm "$outputDir/xattrtest"
	return 2
}

is_in_list()
{
	local element
	for element in $2; do
		if [ "$1" = "$element" ]; then
			return 0
		fi
	done
	return 1
}

# check for --help or -h and show usage immediately
if [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
	usage; exit 0;
fi

# get cwd and the source directory
currentDir=`pwd`
cd `dirname "$0"`
sourceDir=`pwd`
cd "$currentDir"

# determine output directory
if [ "$currentDir" = "$sourceDir" ]; then
	outputDir=$currentDir/generated
else
	outputDir=$currentDir
fi
buildOutputDir="$outputDir/build"
HAIKU_BUILD_ATTRIBUTES_DIR="$outputDir/attributes"
buildConfigFile="$buildOutputDir/BuildConfig"

# check for update request
if [ "$1" = "--update" ]; then
	if ! [ -e "$buildConfigFile" ]; then
		echo $0 --update: \'$buildConfigFile\' not found - updating not possible.
		exit 1
	fi
	# get last configure invocation and flags from BuildConfig and call ourselves with it
	lastPwd=`grep "#d " "$buildConfigFile" | cut -c 4-`
	lastConfig=`grep "#c " "$buildConfigFile" | cut -c 4-`
	lastEnv=`grep "#e " "$buildConfigFile" | cut -c 4-`
	lastArgs=`grep "#a " "$buildConfigFile" | cut -c 4-`
	if [ -z "$lastConfig" ]; then
		echo "$0 --update: The previous configure invocation was not properly" \
			"encoded into '$buildConfigFile' - updating not possible."
		exit 1
	fi
	cd "$lastPwd"
	if [ -n "$lastEnv" ]; then
		export $lastEnv
	fi
	$lastConfig $lastArgs
	exit $?
fi

# backup the passed arguments
configureArgs="$@"
configurePath=$0

# backup relevant environs
configureEnvirons=
for var in `env`; do
	case "$var" in
		CC\=*|HAIKU*\=*)
			configureEnvirons="$configureEnvirons $var"
			;;
	esac
done

# ensure umask is not too restrictive
if [ `umask` -gt 22 ]; then
	echo Your umask is too restrictive "(should be <= 0022;" is actually `umask`")"
	echo
	echo Additionally, if the source tree was cloned with a too-restrictive umask,
	echo you will need to run \"git checkout\" again to fix this.
	exit 1
fi
# ensure git checkout was not done with a restrictive umask
if [ `stat -c '%a' "$sourceDir/data/system/boot/SetupEnvironment"` -lt 644 ]; then
	echo "The source tree was cloned with a umask > 0022. It seems you"
	echo have already corrected your umask, but not re-checked-out the
	echo source tree. Try running:
	echo "	git checkout --force"
	echo to fix this problem.
	exit 1
fi


# internal default parameter values
#
platform=`uname`
platformMachine=`uname  -m`
targetArchs=
buildCrossTools=
buildCrossToolsScript="$sourceDir/build/scripts/build_cross_tools"
buildCrossToolsJobs=
useClang=0
useGccGraphiteDefault=0
unknownArchIndex=1
haikuTargetArchs=
gdbSources=

if [ -z "$CC" ]; then
	CC=gcc
fi

# exported (BuildSetup) default parameter values
#
HOST_GCC_RAW_VERSION=`$CC -dumpversion`
HOST_GCC_MACHINE=`$CC -dumpmachine`
HAIKU_INCLUDE_SOURCES=0
HAIKU_INCLUDE_3RDPARTY=0
HAIKU_DISTRO_COMPATIBILITY=default
TARGET_PLATFORM=haiku
HAIKU_USE_GCC_PIPE=0
HAIKU_HOST_USE_32BIT=0
HAIKU_HOST_USE_XATTR=
HAIKU_HOST_USE_XATTR_REF=
HAIKU_HOST_BUILD_ONLY=0
HOST_EXTENDED_REGEX_SED="sed -r"
HOST_GCC_LD=`$CC -print-prog-name=ld`
HOST_GCC_OBJCOPY=`$CC -print-prog-name=objcopy`
HOST_SHA256=
HOST_HAIKU_PORTER=
HAIKU_PORTS=
HAIKU_PORTS_CROSS=
HAIKU_IS_BOOTSTRAP=0
HAIKU_NO_DOWNLOADS=0

HAIKU_PACKAGING_ARCHS=

set_default_value HAIKU_NASM		nasm

if sha256sum < /dev/null > /dev/null 2>&1; then
	HOST_SHA256=sha256sum
elif sha256 < /dev/null > /dev/null 2>&1; then
	HOST_SHA256="sha256 -q"
elif shasum < /dev/null > /dev/null 2>&1; then
	HOST_SHA256="shasum -a 256"
else
	echo "Error: Neither sha256sum nor sha256 seem to be available!" >&2
	exit 1
fi

haikuRequiredLegacyGCCVersion="2.95.3-haiku-2017_07_20"
export haikuRequiredLegacyGCCVersion
	# version of legacy gcc required to build haiku
supportedTargetArchs="
	arm
	arm64
	m68k
	ppc
	riscv64
	sparc
	x86
	x86_64
	x86_gcc2
	"

# parse parameters
#
while [ $# -gt 0 ] ; do
	case "$1" in
		--bootstrap)
			assertparams "$1" 3 $#
			HOST_HAIKU_PORTER="`absolute_path $2`"
			HAIKU_PORTS_CROSS="`absolute_path $3`"
			HAIKU_PORTS="`absolute_path $4`"
			HAIKU_IS_BOOTSTRAP=1
			HAIKU_NO_DOWNLOADS=1
			check_file_exists "$HOST_HAIKU_PORTER" || (
				echo "Invalid path to haikuporter: $HOST_HAIKU_PORTER" >&2
				exit 1
			)
			check_dir_exists "$HAIKU_PORTS" || (
				echo "Non-existent directory $HAIKU_PORTS" >&2
				exit 1
			)
			check_dir_exists "$HAIKU_PORTS_CROSS" || (
				echo "Non-existent directory $HAIKU_PORTS_CROSS" >&2
				exit 1
			)
			shift 4
			;;
		--build-cross-tools)
			if [ -z "$buildCrossTools" ]; then
				assertparams "$1" 2 $#
				targetArch=$2
				buildCrossTools=$3
				shift 3
			else
				assertparam "$1" $#
				targetArch=$2
				shift 2
			fi
			case "$targetArch" in
				x86_gcc2)	targetMachine=i586-pc-haiku;;
				x86)		targetMachine=i586-pc-haiku;;
				x86_64)		targetMachine=x86_64-unknown-haiku;;
				ppc)		targetMachine=powerpc-apple-haiku;;
				m68k)		targetMachine=m68k-unknown-haiku;;
				arm)		targetMachine=arm-unknown-haiku;;
				riscv64)	targetMachine=riscv64-unknown-haiku;;
				sparc)		targetMachine=sparc64-unknown-haiku;;
				*)
					echo "Unsupported target architecture: $targetArch" >&2
					exit 1
					;;
			esac
			set_variable buildCrossToolsMachine_$targetArch $targetMachine
			targetArchs="$targetArchs $targetArch"
			;;
		--cross-tools-prefix)
			assertparam "$1" $#
			targetArch=unknown${unknownArchIndex}
			set_variable crossToolsPrefix_$targetArch "$2"
			targetArchs="$targetArchs $targetArch"
			unknownArchIndex=$(($unknownArchIndex + 1))
			shift 2
			;;
		--distro-compatibility)
			assertparam "$1" $#
			HAIKU_DISTRO_COMPATIBILITY=$2
			case "$HAIKU_DISTRO_COMPATIBILITY" in
				official)	;;
				compatible)	;;
				default)	;;
				*)			echo "Invalid distro compatibility" \
								"level: $HAIKU_DISTRO_COMPATIBILITY"
							exit 1;;
			esac
			shift 2
			;;
		--host-only)	HAIKU_HOST_BUILD_ONLY=1; shift 1;;
		--include-sources)	HAIKU_INCLUDE_SOURCES=1; shift 1;;
		--include-3rdparty)	HAIKU_INCLUDE_3RDPARTY=1; shift 1;;
        -j*)				buildCrossToolsJobs="$1"; shift 1;;
		--no-downloads)	HAIKU_NO_DOWNLOADS=1; shift 1;;
		--target-arch)
			assertparam "$1" $#
			targetArch=$2
			shift 2
			if [ ! "$platform" = Haiku ]; then
				echo "--target-arch can only be specified on Haiku." >&2
				exit 1
			fi
			is_in_list "$targetArch" "$supportedTargetArchs" || (
				echo "Unsupported target architecture: \"$targetArch\"" >&2
				exit 1
			)
			haikuTargetArchs="$haikuTargetArchs $targetArch"
			;;
		--use-clang)
			assertparam "$1" $#
			targetArch=$2
			useClang=1
			case "$targetArch" in
				x86)		targetMachine=i586-pc-haiku;;
				x86_64)		targetMachine=x86_64-unknown-haiku;;
				ppc)		targetMachine=powerpc-apple-haiku;;
				arm)		targetMachine=arm-unknown-haiku;;
				arm64)		targetMachine=arm64-unknown-haiku;;
				riscv64)	targetMachine=riscv64-unknown-haiku;;
				sparc)		targetMachine=sparc64-unknown-haiku;;
				*)
					echo "Unsupported target architecture: $2" >&2
					exit 1
					;;
			esac
			get_build_tool_path clang clang
			if [ -z `get_variable "crossToolsPrefix_$targetArch"` ] \
					&& [ -z `get_variable buildCrossToolsMachine_$targetArch` ]; then
				set_variable crossToolsPrefix_$targetArch llvm-
			fi
			clangVersion=`$HAIKU_clang -v 2>&1 | head -1 | cut -d " " -f3`
			if [ `echo $clangVersion | head -c 1` -lt 7 ]; then
				echo "Haiku requires Clang 7 or better to build, but you have $clangVersion."
				echo "Please install a newer version."
				exit 1
			fi
			targetArchs="$targetArchs $targetArch"
			shift 2
			;;
		--use-gcc-pipe)	HAIKU_USE_GCC_PIPE=1; shift 1;;
		--use-gcc-graphite)	useGccGraphiteDefault=1; shift 1;;
		--use-32bit)	HAIKU_HOST_USE_32BIT=1; shift 1;;
		--no-full-xattr)HAIKU_HOST_USE_XATTR=0; shift 1;;
		--no-xattr)		HAIKU_HOST_USE_XATTR_REF=0; shift 1;;
		--with-gdb)	gdbSources=$2; shift 2;;
		*)				echo Invalid argument: \`$1\'; exit 1;;
	esac
done

# detect the build platform
case "${platform}" in
	Darwin)	HOST_PLATFORM=darwin ;;
	FreeBSD)	HOST_PLATFORM=freebsd
				if [ "$HAIKU_HOST_USE_32BIT" = 1 ] ; then
					echo Unsupported platform: FreeBSD ${platformMachine}
					exit 1
				fi	;;
	Haiku)	HOST_PLATFORM=haiku_host ;;
	Linux)	HOST_PLATFORM=linux ;;
	OpenBSD) HOST_PLATFORM=openbsd ;;
	MINGW*) HOST_PLATFORM=mingw ;;
	*)		echo Unsupported platform: ${platform}
			exit 1 ;;
esac

# check for case-sensitive filesystem
mkdir haikuCaseTest 2>/dev/null
mkdir haikucasetest 2>/dev/null
caseInsensitive=$?
rmdir haikuCaseTest haikucasetest 2>/dev/null
if [ $caseInsensitive != 0 ]; then
	echo "You need a case-sensitive file-system to build Haiku."
	if [ $HOST_PLATFORM = "darwin" ]; then
		echo "You can create a case-sensitive disk image using Disk Utility."
	fi
	exit 1
fi

# check xattr support
if [ -z $HAIKU_HOST_USE_XATTR_REF ]; then
	check_native_xattrs
	attrSupport=$?
	if [ $attrSupport = 2 ] && [ -z $HAIKU_HOST_USE_XATTR ]; then
		HAIKU_HOST_USE_XATTR=1
	elif [ $attrSupport = 1 ]; then
		HAIKU_HOST_USE_XATTR_REF=1
	fi
fi
if [ -z $HAIKU_HOST_USE_XATTR ]; then HAIKU_HOST_USE_XATTR=0; fi
if [ -z $HAIKU_HOST_USE_XATTR_REF ]; then HAIKU_HOST_USE_XATTR_REF=0; fi

# determine how to invoke sed with extended regexp support for non-GNU sed
if [ $HOST_PLATFORM = "darwin" ]; then
	HOST_EXTENDED_REGEX_SED="sed -E"
fi

# locate python
if python3 --version < /dev/null > /dev/null 2>&1; then
	HOST_PYTHON="python3"
elif python --version < /dev/null > /dev/null 2>&1; then
	HOST_PYTHON="python"
else
	echo "a python interpreter is required"
	exit 1
fi

# check if nasm can actually output ELF files
# (the stock version in OSX can't)
# XXX: should probably only test for x86* arch
if [ "$("$HAIKU_NASM" -hf | grep -c elf'[36][24] ')" -ne "2" ]; then
	echo "$HAIKU_NASM cannot generate ELF files. Please install a working version."
	if [ $HOST_PLATFORM = "darwin" ]; then
		echo "You can install it from Mac Ports."
		echo "Mac Ports is available at: http://www.macports.org/"
	fi
	exit 1
fi

# create output directory
mkdir -p "$buildOutputDir" || exit 1

if [ "$HAIKU_HOST_BUILD_ONLY" = 1 ]; then
	invalidCommand=$sourceDir/build/scripts/host_build_only
	HAIKU_AR=$invalidCommand
	HAIKU_CC=$invalidCommand
	HAIKU_LD=$invalidCommand
	HAIKU_OBJCOPY=$invalidCommand
	HAIKU_RANLIB=$invalidCommand
	HAIKU_ELFEDIT=$invalidCommand
	HAIKU_NASM=$invalidCommand
	HAIKU_STRIP=$invalidCommand
else
	# On Haiku determine target architectures and tools automatically.
	if [ -z "$targetArchs" ]; then
		if [ $HOST_PLATFORM != haiku_host ]; then
			echo "Please specify the build tools to use or build (via" \
				"--cross-tools-prefix or --build-cross-tools) or specify a" \
				"host-only build (--host-only)." >&2
			echo "For more info, invoke $0 --help"
			exit 1
		fi

		# determine primary architecture
		targetArch=`package list -i /system/packages/haiku-*.hpkg \
			| sed '/^\s*architecture:/!d; s,^\s*architecture:\s*,,'`
		is_in_list "$targetArch" "$supportedTargetArchs" || (
			echo "Unsupported target architecture: \"$targetArch\"" >&2
			exit 1
		)
		targetArchs=$targetArch

		set_default_value HAIKU_AR_$targetArch			ar
		set_default_value HAIKU_CC_$targetArch			gcc
		set_default_value HAIKU_LD_$targetArch			ld
		set_default_value HAIKU_OBJCOPY_$targetArch		objcopy
		set_default_value HAIKU_RANLIB_$targetArch		ranlib
		set_default_value HAIKU_ELFEDIT_$targetArch		elfedit
		set_default_value HAIKU_STRIP_$targetArch		strip

		# determine secondary architectures
		for targetArch in $supportedTargetArchs; do
			if [ -e /system/packages/haiku_$targetArch-*.hpkg ]; then
				targetArchs="$targetArchs $targetArch"
				set_default_value HAIKU_AR_$targetArch		ar-$targetArch
				set_default_value HAIKU_CC_$targetArch		gcc-$targetArch
				set_default_value HAIKU_LD_$targetArch		ld-$targetArch
				set_default_value HAIKU_OBJCOPY_$targetArch	objcopy-$targetArch
				set_default_value HAIKU_RANLIB_$targetArch	ranlib-$targetArch
				set_default_value HAIKU_ELFEDIT_$targetArch	elfedit-$targetArch
				set_default_value HAIKU_STRIP_$targetArch	strip-$targetArch
			fi
		done

		# The target architectures might have been specified explicitly.
		if [ -n "$haikuTargetArchs" ]; then
			for targetArch in $haikuTargetArchs; do
				is_in_list "$targetArch" "$targetArchs" || (
					echo "Unsupported target architecture: \"$targetArch\"." \
						"Only native architectures of the host platform can" \
						"be specified." >&2
					exit 1
				)
			done
			targetArchs="$haikuTargetArchs"
		fi
	fi

	isPrimaryArch=1
	for targetArch in $targetArchs; do
		# Note: targetArch is "unknown<n>" at this point if a cross-tools
		# prefix was specified. The standard_gcc_settings call below will get
		# the actual architecture.

		if test "${HAIKU_PACKAGING_ARCHS#*$targetArch\b}" != "$HAIKU_PACKAGING_ARCHS"; then
			# somehow we wound up with a duplicate arch; skip this one
			continue
		fi

		crossToolsPrefix=`get_variable crossToolsPrefix_$targetArch`

		# build cross tools from sources
		if [ -n "$buildCrossTools" -a -z "$crossToolsPrefix" ]; then
			crossToolsDir="$outputDir/cross-tools-$targetArch"
			targetMachine=`get_variable buildCrossToolsMachine_$targetArch`
			script="$buildCrossToolsScript"
			scriptArgs=
			if [ $targetArch != x86_gcc2 ]; then
				script="${script}_gcc4"
				scriptArgs="$targetMachine"
				set_default_value HAIKU_USE_GCC_GRAPHITE_$targetArch	\
					$useGccGraphiteDefault
			fi
			secondaryArch=
			if [ -z "$isPrimaryArch" ]; then
				secondaryArch=$targetArch
			fi

			case $HOST_PLATFORM in
				freebsd|openbsd)	MAKE=gmake;;
				*)					MAKE=make;;
			esac

			if ! valid_toolchain "${targetMachine}" "${crossToolsDir}" "${buildCrossTools}"; then
				MAKE=$MAKE \
				SECONDARY_ARCH=$secondaryArch \
				HAIKU_USE_GCC_GRAPHITE=`get_variable \
					HAIKU_USE_GCC_GRAPHITE_$targetArch` \
				HAIKU_USE_GCC_PIPE=$HAIKU_USE_GCC_PIPE \
				HAIKU_USE_GDB="$gdbSources" \
				"$script" $scriptArgs "$sourceDir" "$buildCrossTools" \
					"$crossToolsDir" $buildCrossToolsJobs || exit 1
			else
				echo "$targetArch crosstools already exist in $crossToolsDir; skipping build"
			fi
			crossToolsPrefix="$crossToolsDir/bin/${targetMachine}-"
		fi

		# prepare gcc settings and get the actual target architecture
		if [ $useClang = 1 ]; then
			gcc="$HAIKU_clang -target ${targetMachine}"
			if [ ! -z "${crossToolsPrefix}" ]; then
				gcc="$gcc -B ${crossToolsPrefix}"
			fi

			# Clang's compiler intrinsics are not compatible with GCC's or even
			# across versions of Clang, so we must collect them for use in the build.
			mkdir -p "$outputDir/clang_headers" || exit 1
			clangHeadersDir=`$gcc -print-resource-dir`/include/
			case $targetArch in
				x86*) cp $clangHeadersDir/*intrin* $clangHeadersDir/mm3* "$outputDir/clang_headers" || exit 1 ;;
				ppc*) cp $clangHeadersDir/*altivec* "$outputDir/clang_headers" || exit 1 ;;
				arm*) cp $clangHeadersDir/*arm* "$outputDir/clang_headers" || exit 1 ;;
			esac
		elif [ -z "${crossToolsPrefix}" ]; then
			gcc=`get_variable HAIKU_CC_$targetArch`
		else
			gcc="${crossToolsPrefix}gcc"
		fi
		standard_gcc_settings "$gcc"
		targetArch=$standard_gcc_settings_targetArch

		# set default values for flags
		set_default_value HAIKU_CPPFLAGS_$targetArch	""
		set_default_value HAIKU_CCFLAGS_$targetArch		""
		set_default_value HAIKU_CXXFLAGS_$targetArch	""
		set_default_value HAIKU_LINKFLAGS_$targetArch	""
		set_default_value HAIKU_LDFLAGS_$targetArch		""
		set_default_value HAIKU_ARFLAGS_$targetArch		cru
		set_default_value HAIKU_UNARFLAGS_$targetArch	x

		# Override the cross tools variables, if the tools were built or a
		# prefix was specified.
		if [ $useClang = 1 ]; then
			get_build_tool_path LD_$targetArch ld.lld
			get_build_tool_path ELFEDIT_$targetArch elfedit
		elif [ -n "$crossToolsPrefix" ]; then
			get_build_tool_path LD_$targetArch ${crossToolsPrefix}ld
			case `get_variable HAIKU_GCC_RAW_VERSION_$targetArch` in
				4.*|5.*|6.*|7.*|8.*)
					get_build_tool_path ELFEDIT_$targetArch \
						${crossToolsPrefix}elfedit
				;;
			esac
		fi
		if [ -n "$crossToolsPrefix" ]; then
			get_build_tool_path AR_$targetArch ${crossToolsPrefix}ar
			get_build_tool_path OBJCOPY_$targetArch ${crossToolsPrefix}objcopy
			get_build_tool_path RANLIB_$targetArch ${crossToolsPrefix}ranlib
			get_build_tool_path STRIP_$targetArch ${crossToolsPrefix}strip
		fi

		# check whether the Haiku compiler really targets Haiku
		targetMachine=`get_variable HAIKU_GCC_MACHINE_$targetArch`
		case "$targetMachine" in
			*-*-haiku)	;;
			*)
				echo The compiler specified as Haiku target compiler is not a \
				valid Haiku cross-compiler. Please see ReadMe.cross-compile. >&2
				echo compiler: $HAIKU_CC
				echo compiler is configured for target: $targetMachine
				exit 1 ;;
		esac

		HAIKU_PACKAGING_ARCHS="$HAIKU_PACKAGING_ARCHS $targetArch"
		isPrimaryArch=
	done
fi

# Generate BuildConfig
cat << EOF > "$buildConfigFile"
# -- WARNING --
# This file was AUTOMATICALLY GENERATED by configure, and will be completely
# overwritten the next time configure is run.
#
#d ${currentDir}
#c ${configurePath}
#e ${configureEnvirons}
#a ${configureArgs}

HOST_PLATFORM				?= "${HOST_PLATFORM}" ;
TARGET_PLATFORM 			?= "${TARGET_PLATFORM}" ;
HAIKU_PACKAGING_ARCHS		?= ${HAIKU_PACKAGING_ARCHS} ;

HAIKU_NO_DOWNLOADS			?= "${HAIKU_NO_DOWNLOADS}" ;
HAIKU_INCLUDE_SOURCES		?= "${HAIKU_INCLUDE_SOURCES}" ;
HAIKU_INCLUDE_3RDPARTY		?= "${HAIKU_INCLUDE_3RDPARTY}" ;
HAIKU_DISTRO_COMPATIBILITY	?= "${HAIKU_DISTRO_COMPATIBILITY}" ;

HAIKU_USE_GCC_PIPE			?= "${HAIKU_USE_GCC_PIPE}" ;
HAIKU_HOST_USE_32BIT		?= "${HAIKU_HOST_USE_32BIT}" ;
HAIKU_HOST_USE_XATTR		?= "${HAIKU_HOST_USE_XATTR}" ;
HAIKU_HOST_USE_XATTR_REF	?= "${HAIKU_HOST_USE_XATTR_REF}" ;
HAIKU_HOST_BUILD_ONLY		?= "${HAIKU_HOST_BUILD_ONLY}" ;

HOST_CC						?= ${CC} ;
HOST_GCC_RAW_VERSION		?= ${HOST_GCC_RAW_VERSION} ;
HOST_GCC_MACHINE			?= ${HOST_GCC_MACHINE} ;
HOST_LD						?= ${HOST_GCC_LD} ;
HOST_OBJCOPY				?= ${HOST_GCC_OBJCOPY} ;
HOST_EXTENDED_REGEX_SED		?= ${HOST_EXTENDED_REGEX_SED} ;
HOST_SHA256					?= ${HOST_SHA256} ;
HOST_PYTHON					?= ${HOST_PYTHON} ;
HAIKU_NASM					?= ${HAIKU_NASM} ;

HAIKU_BUILD_ATTRIBUTES_DIR	?= "${HAIKU_BUILD_ATTRIBUTES_DIR}" ;

HOST_HAIKU_PORTER			?= ${HOST_HAIKU_PORTER} ;
HAIKU_PORTS					?= ${HAIKU_PORTS} ;
HAIKU_PORTS_CROSS			?= ${HAIKU_PORTS_CROSS} ;
HAIKU_IS_BOOTSTRAP			?= ${HAIKU_IS_BOOTSTRAP} ;

EOF

for targetArch in $HAIKU_PACKAGING_ARCHS; do
	variables="
		HAIKU_CC					HAIKU_CC
		HAIKU_CC_IS_CLANG			HAIKU_CC_IS_CLANG
		HAIKU_USE_GCC_GRAPHITE		HAIKU_USE_GCC_GRAPHITE
		HAIKU_CPU					HAIKU_CPU
		HAIKU_GCC_MACHINE			HAIKU_GCC_MACHINE
		HAIKU_GCC_RAW_VERSION		HAIKU_GCC_RAW_VERSION
		HAIKU_GCC_LIB_DIR			HAIKU_GCC_LIB_DIR
		HAIKU_BOOT_LIBGCC			HAIKU_BOOT_LIBGCC
		HAIKU_BOOT_LIBSUPC++		HAIKU_BOOT_LIBSUPCXX
		HAIKU_AR					HAIKU_AR
		HAIKU_LD					HAIKU_LD
		HAIKU_OBJCOPY				HAIKU_OBJCOPY
		HAIKU_RANLIB				HAIKU_RANLIB
		HAIKU_ELFEDIT				HAIKU_ELFEDIT
		HAIKU_STRIP					HAIKU_STRIP
		HAIKU_CPPFLAGS				HAIKU_CPPFLAGS
		HAIKU_CCFLAGS				HAIKU_CCFLAGS
		HAIKU_C++FLAGS				HAIKU_CXXFLAGS
		HAIKU_LINKFLAGS				HAIKU_LINKFLAGS
		HAIKU_LDFLAGS				HAIKU_LDFLAGS
		HAIKU_ARFLAGS				HAIKU_ARFLAGS
		HAIKU_UNARFLAGS				HAIKU_UNARFLAGS
		"
	set -- $variables
	while [ $# -ge 2 ]; do
		value=`get_variable ${2}_$targetArch`
		echo "${1}_${targetArch} ?= $value ;" >> "$buildConfigFile"
		shift 2
	done

	# For variables that may have long values, distribute them over multiple
	# lines so that jam doesn't hit the maximum line length.
	variables="
		HAIKU_BOOT_C++_HEADERS_DIR	HAIKU_BOOT_CXX_HEADERS_DIR
		"
	set -- $variables
	while [ $# -ge 2 ]; do
		echo "${1}_${targetArch} ?= " >> "$buildConfigFile"
		get_variable ${2}_$targetArch | xargs -n 1 echo "   " \
			>> "$buildConfigFile"
		echo "    ;" >> "$buildConfigFile"
		shift 2
	done
done


# Generate a Jamfile in the output directory.

cat << EOF > $outputDir/Jamfile
# -- WARNING --
# This file was AUTOMATICALLY GENERATED by configure, and will be completely
# overwritten the next time configure is run.

HAIKU_TOP			= $(relative_to "${sourceDir}" "${outputDir}") ;
HAIKU_OUTPUT_DIR	= . ;

include [ FDirName \$(HAIKU_TOP) Jamfile ] ;

EOF

echo "Configured successfully!"