#!/bin/sh
#
# parameters <machine> <haiku sourcedir> <buildtools dir> <isntall dir>

# get and check the parameters
if [ $# -lt 4 ]; then
	echo Usage: $0 '<machine> <haiku sourcedir> <buildtools dir>' \
		'<install dir>' >&2
	exit 1
fi

haikuMachine=$1
haikuSourceDir=$2
buildToolsDir=$3
installDir=$4
shift 4
additionalMakeArgs=$*

kernelCcFlags="-D_KERNEL_MODE"
ccFlags="-O2"
cxxFlags="-O2"
case $haikuMachine in
x86_64-*)
	# GCC's default is to enable multilib, but there is a bug when
	# explicitly using --enable-multilib that causes a build
	# failure
	binutilsConfigureArgs=""
	gccConfigureArgs=""
	kernelCcFlags="$kernelCcFlags -mno-red-zone"
	;;
m68k-*)
	binutilsConfigureArgs="--enable-multilib"
	gccConfigureArgs="--enable-multilib"
	;;
arm-*)
	binutilsConfigureArgs="--enable-multilib"
	gccConfigureArgs="--enable-multilib"
	;;
*)
	binutilsConfigureArgs="--disable-multilib"
	gccConfigureArgs="--disable-multilib"
	;;
esac

if [ `uname -s` = 'Haiku' ]; then
	# force cross-build if building on Haiku:
	buildhostMachine=${haikuMachine}_buildhost
	buildHostSpec="--build=$buildhostMachine --host=$buildhostMachine"
fi

if [ ! -d "$haikuSourceDir" ]; then
	echo "No such directory: \"$haikuSourceDir\"" >&2
	exit 1
fi

if [ ! -d "$buildToolsDir" ]; then
	echo "No such directory: \"$buildToolsDir\"" >&2
	exit 1
fi


# create the output dir
mkdir -p "$installDir" || exit 1


# get absolute paths
currentDir=$(pwd)

cd "$haikuSourceDir"
haikuSourceDir=$(pwd)
cd "$currentDir"

cd "$buildToolsDir"
buildToolsDir=$(pwd)
cd "$currentDir"

cd "$installDir"
installDir=$(pwd)
cd "$currentDir"

binutilsSourceDir="$buildToolsDir/binutils"
gccSourceDir="$buildToolsDir/gcc"


# get gcc version
gccVersion=$(cat "$gccSourceDir/gcc/BASE-VER")

if [ -z "$gccVersion" ]; then
	echo "Failed to find out gcc version." >&2
	exit 1
fi

# touch all info files in order to avoid the dependency on makeinfo
# (which apparently doesn't work reliably on all the different host 
# configurations and changes files which in turn appear as local changes
# to the VCS).
find "$binutilsSourceDir" "$gccSourceDir" -name \*.info -print0 | xargs -0 touch

# create the object and installation directories for the cross compilation tools
objDir="${installDir}-build"
binutilsObjDir="$objDir/binutils"
gccObjDir="$objDir/gcc"
stdcxxObjDir="$objDir/stdcxx"
sysrootDir="$installDir/sysroot"
tmpIncludeDir="$sysrootDir/boot/system/develop/headers"
tmpLibDir="$sysrootDir/boot/system/develop/lib"

rm -rf "$installDir" "$objDir"

mkdir -p "$installDir" "$objDir" "$binutilsObjDir" "$gccObjDir" "$stdcxxObjDir" \
	"$tmpIncludeDir" "$tmpLibDir" || exit 1
mkdir -p "$installDir/lib/gcc/$haikuMachine/$gccVersion"

if [ "$HAIKU_USE_GCC_GRAPHITE" = 1 ]; then
	cloogSourceDir="$buildToolsDir/cloog"
	gmpSourceDir="$buildToolsDir/gcc/gmp"
	islSourceDir="$buildToolsDir/isl"

	islObjDir="$objDir/isl"
	gmpObjDir="$objDir/gmp"
	cloogObjDir="$objDir/cloog"
	mkdir -p "$islObjDir" "$gmpObjDir" "$cloogObjDir" || exit 1

	gccConfigureArgs="$gccConfigureArgs --with-cloog=$installDir \
		--enable-cloog-backend=isl --with-isl=$installDir \
		--with-gmp=$installDir \
		--with-host-libstdcxx=\"-lstdc++\""
fi
if [ "$HAIKU_USE_GCC_PIPE" = 1 ]; then
	ccFlags="$ccFlags -pipe"
	cxxFlags="$cxxFlags -pipe"
fi

if [ -n "$SECONDARY_ARCH" ]; then
	gccConfigureArgs="$gccConfigureArgs --with-hybrid-secondary=$SECONDARY_ARCH"
fi

# force the POSIX locale, as the build (makeinfo) might choke otherwise
export LC_ALL=POSIX

# build binutils
cd "$binutilsObjDir"
CFLAGS="$ccFlags" CXXFLAGS="$cxxFlags" "$binutilsSourceDir/configure" \
	--prefix="$installDir" $buildHostSpec --target=$haikuMachine \
	--enable-targets=$haikuMachine,i386-efi-pe,x86_64-efi-pe \
	--disable-nls --disable-shared --disable-werror \
	--with-sysroot="$sysrootDir" \
	$binutilsConfigureArgs \
	|| exit 1
$MAKE $additionalMakeArgs || exit 1
$MAKE $additionalMakeArgs install || exit 1

export PATH=$PATH:"$installDir/bin"

if [ "$HAIKU_USE_GCC_GRAPHITE" = 1 ]; then
	# build gmp
	cd "$gmpObjDir"
	CFLAGS="$ccFlags" CXXFLAGS="$cxxFlags" "$gmpSourceDir/configure" \
		--prefix="$installDir" --disable-shared --enable-cxx || exit 1
	$MAKE $additionalMakeArgs || exit 1
	$MAKE $additionalMakeArgs install || exit 1

	# build isl
	cd "$islObjDir"
	CFLAGS="$ccFlags" CXXFLAGS="$cxxFlags" "$islSourceDir/configure" \
		--prefix="$installDir" --disable-nls --disable-shared \
		 --with-gmp-prefix="$installDir" || exit 1
	$MAKE $additionalMakeArgs || exit 1
	$MAKE $additionalMakeArgs install || exit 1

	# build cloog
	cd "$cloogObjDir"
	CFLAGS="$ccFlags" CXXFLAGS="$cxxFlags" "$cloogSourceDir/configure" \
		--prefix="$installDir" --disable-nls --disable-shared \
		--with-gmp-prefix="$installDir" --with-isl-prefix=="$installDir" \
		|| exit 1
	$MAKE $additionalMakeArgs || exit 1
	$MAKE $additionalMakeArgs install || exit 1
fi

# build gcc

# prepare the include files
copy_headers()
{
	sourceDir=$1
	targetDir=$2

	headers="$(find $sourceDir -name \*\.h)"
	headers="$(echo $headers | sed -e s@$sourceDir/@@g)"
	for f in $headers; do
		headerTargetDir="$targetDir/$(dirname $f)"
		mkdir -p "$headerTargetDir"
		cp "$sourceDir/$f" "$headerTargetDir"
	done
}

copy_headers "$haikuSourceDir/headers/config" "$tmpIncludeDir/config"
copy_headers "$haikuSourceDir/headers/os" "$tmpIncludeDir/os"
copy_headers "$haikuSourceDir/headers/posix" "$tmpIncludeDir/posix"

# configure gcc
cd "$gccObjDir"
CFLAGS="$ccFlags" CXXFLAGS="$cxxFlags" "$gccSourceDir/configure" \
	--prefix="$installDir" $buildHostSpec --target=$haikuMachine \
	--disable-nls --disable-shared --with-system-zlib \
	--enable-languages=c,c++ --enable-lto --enable-frame-pointer \
	--with-sysroot="$sysrootDir" --enable-threads=posix \
	$gccConfigureArgs \
	|| exit 1

# make gcc
$MAKE $additionalMakeArgs || {
	echo "ERROR: Building gcc failed." >&2
	exit 1
}

# install gcc
$MAKE $additionalMakeArgs install || {
	echo "ERROR: Installing the cross compiler failed." >&2
	exit 1
}

# build libraries for the kernel if the target arch requires it
if [ -n "$kernelCcFlags" ]; then
	# switch threads config to single for libgcc
	ln -sf "$gccSourceDir/libgcc/gthr-single.h" "$haikuMachine/libgcc/gthr-default.h"
	$MAKE -C "$haikuMachine/libgcc" clean
	$MAKE -C "$haikuMachine/libgcc" CFLAGS="-g -O2 $kernelCcFlags" || {
		echo "Error: Building kernel libgcc failed." >&2
		exit 1
	}

	cp "$haikuMachine/libgcc/libgcc.a" \
		"$installDir/$haikuMachine/lib/libgcc-kernel.a" || exit 1

	$MAKE -C "$haikuMachine/libstdc++-v3/libsupc++" clean

	# switch threads config to single for libsupc++
	[ -f "$haikuMachine/32/libstdc++-v3/include/$haikuMachine/bits/gthr-default.h" ] \
		&& cp -f "$haikuMachine/32/libstdc++-v3/include/$haikuMachine/bits/gthr-single.h" \
		"$haikuMachine/32/libstdc++-v3/include/$haikuMachine/bits/gthr-default.h"
	cp -f "$haikuMachine/libstdc++-v3/include/$haikuMachine/bits/gthr-single.h" \
		"$haikuMachine/libstdc++-v3/include/$haikuMachine/bits/gthr-default.h"
	[ -f "$haikuMachine/32/libstdc++-v3/config.h" ] \
		&& sed -i '/.*_GLIBCXX_HAS_GTHREADS.*/c\#undef _GLIBCXX_HAS_GTHREADS' \
		"$haikuMachine/32/libstdc++-v3/config.h"
	sed -i '/.*_GLIBCXX_HAS_GTHREADS.*/c\#undef _GLIBCXX_HAS_GTHREADS' \
		"$haikuMachine/libstdc++-v3/config.h"
	$MAKE -C "$haikuMachine/libstdc++-v3/libsupc++" CFLAGS="-g -O2 $kernelCcFlags" \
		CXXFLAGS="-g -O2 $kernelCcFlags" || {
		echo "Error: Building kernel libsupc++ failed." >&2
		exit 1
	}

	cp "$haikuMachine/libstdc++-v3/libsupc++/.libs/libsupc++.a" \
		"$installDir/$haikuMachine/lib/libsupc++-kernel.a" || exit 1
fi

# cleanup

# remove the system headers from the installation dir
# Only the ones from the source tree should be used.
rm -rf "$installDir/$haikuMachine/sys-include"

# remove the sysroot dir
rm -rf "$sysrootDir"

# remove the objects dir
rm -rf "$objDir"


echo "binutils and gcc for cross compilation have been built successfully!"