#!/bin/sh

# parameters <haiku sourcedir> <buildtools dir> <haiku output dir>

# get and check the parameters
if [ $# -lt 3 ]; then
	echo Usage: $0 '<haiku sourcedir> <buildtools dir> <haiku output dir>' >&2
	exit 1
fi

haikuSourceDir=$1
buildToolsDir=$2/legacy
haikuOutputDir=$3
shift 3
additionalMakeArgs=$*
	# Note: The gcc 2 build has trouble with -jN N > 1, hence we only use the
	# additional flags for the binutils build. Should there ever be any other
	# flags than -jN, we need to handle this differently.


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

if ! grep "$haikuRequiredLegacyGCCVersion" \
		$buildToolsDir/gcc/gcc/version.c >/dev/null 2>&1 ; then
	echo "*** Mismatching compiler versions between configure script and" >&2
	echo "*** $buildToolsDir/gcc/gcc/version.c" >&2
	echo "*** Did you perhaps update only one of haiku & buildtools?" >&2
	exit 1
fi


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


# get absolute paths
currentDir=`pwd`

cd $haikuSourceDir
haikuSourceDir=`pwd`
cd $currentDir

cd $buildToolsDir
buildToolsDir=`pwd`
cd $currentDir

cd $haikuOutputDir
haikuOutputDir=`pwd`


# create the object and installation directories for the cross compilation tools
installDir=$haikuOutputDir/cross-tools
objDir=$haikuOutputDir/cross-tools-build
binutilsObjDir=$objDir/binutils
gccObjDir=$objDir/gcc
tmpIncludeDir=$objDir/sysincludes
tmpLibDir=$objDir/syslibs

rm -rf $installDir $objDir

mkdir -p $installDir $objDir $binutilsObjDir $gccObjDir $tmpIncludeDir \
	$tmpLibDir || exit 1
mkdir -p $installDir/lib/gcc-lib/i586-pc-haiku/$haikuRequiredLegacyGCCVersion

# build binutils
cd $binutilsObjDir
CFLAGS="-O2" CXXFLAGS="-O2" $buildToolsDir/binutils/configure \
	--prefix=$installDir --target=i586-pc-haiku --disable-nls \
	--enable-shared=yes --disable-werror || exit 1
make $additionalMakeArgs || exit 1
make $additionalMakeArgs install || exit 1

PATH=$PATH:$installDir/bin
export PATH


# build gcc

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

	headers="`find $sourceDir -name \*\.h | grep -v /.svn`"
	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="-O2 -U_FORTIFY_SOURCE" CXXFLAGS="-O2" $buildToolsDir/gcc/configure \
	--prefix=$installDir \
	--target=i586-pc-haiku --disable-nls --enable-shared=yes \
	--enable-languages=c,c++ --with-headers=$tmpIncludeDir \
	--with-libs=$tmpLibDir || exit 1

# hack the Makefile to avoid trouble with stuff we don't need anyway
sedExpr=
for toRemove in libiberty libio libjava libobjc libstdc++; do
	sedExpr="$sedExpr -e 's@^\(TARGET_CONFIGDIRS =.*\)$toRemove\(.*\)@\1\2@'"
done
echo sedExpr: $sedExpr
mv Makefile Makefile.bak || exit 1
eval "sed $sedExpr Makefile.bak > Makefile" || exit 1
rm Makefile.bak

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

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

# Remove the math.h gcc header. It has been generated by fixincludes
# (unconditional hack: math_huge_val_ifndef) from ours and it is semantically
# equivalent.
rm $installDir/lib/gcc-lib/i586-pc-haiku/$haikuRequiredLegacyGCCVersion/include/math.h


# cleanup

# remove the system headers from the installation dir
# Only the ones from the source tree should be used.
sysIncludeDir=$installDir/i586-pc-haiku/sys-include
rm -rf $sysIncludeDir/be $sysIncludeDir/posix

# remove the objects dir
rm -rf $objDir


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