#!/bin/sh

usage="\
Usage: $0 [options]
Options:
	-h, --help
		Display this usage message.
	-j <num-jobs>, --jobs <num-jobs>
		Run using <num-jobs> different parallel processes.
	-m <mmake-args>, --mmake-args <mmake-args>
		Pass <mmake-args> as options to \`mmake'.
	-o <filename>, --output-file <filename>
		Output results to <filename>.
	-r, --copy-runtime
		Copy the runtime directory instead of linking it.
	-2, --keep-stage-2
		Don't rebuild the stage 2 directory from scratch after
		building stage 1.  Instead use the existing stage 2 directory.
	-3, --keep-stage-3
		Don't rebuild the stage 3 directory from scratch after
		building stage 1.  Instead use the existing stage 3 directory.
"

jfactor=""
mmake_opts="-k"
outfile=""
copy_runtime=false
keep_stage_2=false
keep_stage_3=false

while [ $# -gt 0 ]; do
	case "$1" in

	-h|--help)
		echo "$usage"
		exit 0 ;;

	-j|--jobs)
		jfactor="-j$2"; shift ;;
	-j*)
		jfactor="-j` expr $1 : '-j\(.*\)' `" ;;
	--jobs*)
		jfactor="--jobs` expr $1 : '--jobs\(.*\)' `" ;;

	-m|--mmake)
		mmake_opts="$mmake_opts $2"; shift ;;

	-o|--output-file)
		outfile="$2"; shift ;;
	-o*)
		outfile="` expr $1 : '-o\(.*\)' `"; ;;

	-r|--copy-runtime)
		copy_runtime=true ;;

	-2|--keep-stage-2)
		keep_stage_2=true ;;

	-3|--keep-stage-3)
		keep_stage_3=true ;;

	--)	
		shift; break ;;
	-*)
		echo "$0: unknown option \`$1'" 1>&2
		echo "$usage" 1>&2
		exit 1 ;;
	*)
		break ;;
	esac
	shift
done

if [ $# -ne 0 ]; then
	echo "$0: unexpected argument(s) \`$*'" 1>&2
	echo "$usage" 1>&2
	exit 1
fi

echo "starting at `date`"

root=`/bin/pwd`
PATH=$root/tools:$PATH
export PATH

set -x

if mmake $mmake_opts MMAKEFLAGS=$jfactor all
then
	echo "building of stage 1 successful"
else
	echo "building of stage 1 not successful"
	exit 1
fi

root=`/bin/pwd`

# the stage 1 compiler is copied to allow it to be worked on
# in parallel with the bootcheck itself.

[ -d stage1 ] || mkdir stage1

cp compiler/mercury_compile stage1
MERCURY_COMPILER=$root/stage1/mercury_compile
export MERCURY_COMPILER
MERCURY_INT_DIR=$root/stage2/library
export MERCURY_INT_DIR

# .pp files are not necessary

[ -d stage2 ] || mkdir stage2
$keep_stage_2 || /bin/rm -fr stage2/*
set +x
echo linking stage 2... 1>&2
cd stage2
mkdir compiler
cd compiler
# Break up the links into several chunks.
# This is needed to cope with small limits on the size of argument vectors.
ln -s $root/compiler/[a-h]*.m .
ln -s $root/compiler/[i-s]*.m .
ln -s $root/compiler/[t-z]*.m .
cp $root/compiler/Mmake* .
cd $root/stage2
mkdir library
cd library
ln -s $root/library/[a-l]*.m .
ln -s $root/library/[m-z]*.m .
# ln -s $root/library/*.nl .
cp $root/library/Mmake* .
ln -s $root/library/library.init .
cd $root/stage2
if test "$copy_runtime" = "true"
then
	mkdir runtime
	cd runtime
	ln -s $root/runtime/*.h .
	ln -s $root/runtime/*.c .
	ln -s $root/runtime/*.mod .
	ln -s $root/runtime/*.in .
	cp $root/runtime/Mmake* .
	ln -s $root/runtime/machdeps .
	cd $root/stage2
else
	ln -s $root/runtime .
fi
ln -s $root/boehm_gc .
ln -s $root/doc .
ln -s $root/scripts .
ln -s $root/util .
ln -s $root/profiler .
ln -s $root/conf* .
rm -f config*.log
cp $root/Mmake* .
if test -f $root/Mmake.stage.params
then
	/bin/rm -f Mmake.params
	cp $root/Mmake.stage.params Mmake.params
fi
cd $root

set -x

if (cd stage2 ; mmake $mmake_opts $jfactor runtime)
then
	echo "building of stage 2 runtime successful"
else
	echo "building of stage 2 runtime not successful"
	exit 1
fi

if (cd stage2 ; mmake $mmake_opts depend_library depend_compiler)
then
	echo "building of stage 2 dependencies successful"
else
	echo "building of stage 2 dependencies not successful"
	exit 1
fi

MMAKE_VPATH=.
export MMAKE_VPATH
MMAKE_DIR=$root/scripts
export MMAKE_DIR

# the `RM_C=:' ensures that the `.c' files do not get deleted

if (cd stage2/library ; mmake $mmake_opts $jfactor RM_C=: libmercury)
then
	echo "building of stage 2 library successful"
else
	echo "building of stage 2 library not successful"
	exit 1
fi

if (cd stage2/compiler ; mmake $mmake_opts $jfactor RM_C=: mercury_compile)
then
	echo "building of stage 2 compiler successful"
else
	echo "building of stage 2 compiler not successful"
	exit 1
fi

unset MMAKE_VPATH
unset MMAKE_DIR

if (cd stage2 ; mmake $mmake_opts $jfactor all)
then
	echo "building of stage 2 successful"
else
	echo "building of stage 2 not successful"
	exit 1
fi

MERCURY_COMPILER=$root/stage2/compiler/mercury_compile
export MERCURY_COMPILER
MERCURY_INT_DIR=$root/stage3/library
export MERCURY_INT_DIR

# .pp files are not necessary

[ -d stage3 ] || mkdir stage3
$keep_stage_3 || /bin/rm -fr stage3/*
echo linking stage 3... 1>&2
set +x
cd stage3
mkdir compiler
cd compiler
# Break up the links into several chunks.
# This is needed to cope with small limits on the size of argument vectors.
ln -s $root/compiler/[a-h]*.m .
ln -s $root/compiler/[i-s]*.m .
ln -s $root/compiler/[t-z]*.m .
cp $root/compiler/Mmake* .
cd $root/stage3
mkdir library
cd library
ln -s $root/library/[a-l]*.m .
ln -s $root/library/[m-z]*.m .
# ln -s $root/library/*.nl .
cp $root/library/Mmake* .
ln -s $root/library/library.init .
cd $root/stage3
ln -s $root/boehm_gc .
ln -s $root/doc .
ln -s $root/runtime .
ln -s $root/scripts .
ln -s $root/util .
ln -s $root/profiler .
ln -s $root/conf* .
rm -f config*.log
cp $root/Mmake* .
if test -f $root/Mmake.stage.params
then
	/bin/rm -f Mmake.params
	ln -s $root/Mmake.stage.params Mmake.params
fi
cd $root
set -x

if (cd stage3 ; mmake $mmake_opts depend_library depend_compiler)
then
	echo "building of stage 3 dependencies successful"
else
	echo "building of stage 3 dependencies not successful"
	exit 1
fi

MMAKE_VPATH=.
export MMAKE_VPATH
MMAKE_DIR=$root/scripts
export MMAKE_DIR

if (cd stage3/library ; mmake $mmake_opts $jfactor cs)
then
	echo "building of stage 3 library successful"
else
	echo "building of stage 3 library not successful"
	exit 1
fi

if (cd stage3/compiler ; mmake $mmake_opts $jfactor cs)
then
	echo "building of stage 3 compiler successful"
else
	echo "building of stage 3 compiler not successful"
	exit 1
fi

exit_status=0

exec 3>&1		# save stdout in fd 3
if [ -n "$outfile" ]
then
	exec > "$outfile"	# redirect stdout to $outfile
fi

for dir in library compiler; do
	for file in stage2/$dir/*.c; do
		diff -u $file stage3/$dir/`basename $file` ||
			exit_status=1
	done
done

exec >&3		# restore stdout from fd 3
if [ $exit_status -ne 0 ]; then
	echo "error - stage 2 and stage 3 differ!"
else
	echo "stage 2 and stage 3 compare ok"
fi

echo "finishing at `date`"
exit $exit_status