#!/bin/sh

test -f $PF9/$objtype/config && . $PF9/$objtype/config

libsl=""
frameworks=""
doautolib=true
doautoframework=true
verbose=false

if [ "x$1" = "x-l" ]
then
	shift
	doautolib=false
	doautoframework=false
elif [ "x$1" = "x-v" ]
then
	shift
	verbose=true
fi

target=a.out
if [ "x$1" = "x-o" ]
then
	target=$2
fi

if $doautolib
then
	ofiles=""
	for i
	do
		case "$i" in
		*.[a$O])
			ofiles="$ofiles $i"
			;;
		esac
	done
	
	# echo "ofiles $ofiles"
	autolibs=""
	if [ "x$ofiles" != "x" ]
	then
		a=`
			${TOOLPFX}nm $ofiles |
			grep '__p9l_autolib_[a-zA-Z0-9+-]*$' |
			sed 's/.*__p9l_autolib_//' |
			sort -u
		`
		for i in $a
		do
			autolibs="$autolibs $i"
			eval "need$i=true"
		done
	fi
	if $verbose
	then
		echo "autolibs1 $autolibs"
	fi

	# fetch dependencies out of libraries
	workq="$autolibs 9"
	while [ "x$workq" != "x" ]
	do
		w="$workq"
		workq=""
		for i in $w
		do
			# can't trust the libraries about using
			# libthread or libdraw - we might not be linking with
			# those object files.
			a=`
				${TOOLPFX}nm $PF9/$objtype/lib/lib$i.a 2>/dev/null |
				grep '__p9l_autolib_[a-zA-Z0-9+-]*$' |
				sed 's/.*__p9l_autolib_//' |
				sort -u |
				egrep -v '^(thread|draw)$'
			`
			# fix up libraries that really need draw
			if [ "x$i" = "xmemdraw" -o "x$i" = "xmemlayer" -o "x$i" = "xframe" ]
			then
				a="$a draw"
			fi
			okayfn="true"
			for j in $a
			do
				if eval "[ x\$need$j = x ]"
				then
					autolibs="$autolibs $j"
					workq="$workq $j"
					eval "need$j=true"
				fi
				if [ $j != $i ]
				then
					okayfn="$okayfn && have$j"
				fi
			done
			if $verbose
			then
				echo "can$i: $okayfn"
			fi
			eval "can$i() { $okayfn; }"
		done
	done
	if $verbose
	then
		echo "autolibs $autolibs"
	fi

	for i in $autolibs
	do
		eval "have$i() { false; }"
	done
	havethread() { false; }
	havesec() { false; }
	canmemlayer() { havedraw; }

	# now find correct order
	libsl=""
	while [ "x$autolibs" != x ]
	do
		stillneed=""
		didnothing=true
		for i in $autolibs
		do
			if eval "can$i"
			then
				libsl="-l$i $libsl"
				eval "have$i() { true; }"
				didnothing=false
			else
				stillneed="$stillneed $i"
			fi
		done
		# break cycle by setting the last library on the list
		# to have no dependencies
		if $didnothing
		then
			j="xxx"
			for i in $autolibs
			do
				j=$i
			done
			echo "dependency cycle: $autolibs; breaking with $j"
			eval "can$j() { true; }"
		fi
		autolibs="$stillneed"
	done
	if $verbose
	then
		echo "liborder $libsl"
	fi
	libsl="$libsl -l9"

	# cycle: lib9 expects p9main, which is defined in libthread.  oops.
	if havethread
	then
		libsl="$libsl -lthread -l9"
	fi

	# cycle: lib9 netcrypt uses libsec
	if havesec
	then
		libsl="$libsl -lsec -l9"
	fi

#	if [ "x$needndb" = xtrue -a '(' -f /usr/lib/libresolv.a -o -f /usr/lib/libresolv.dylib ')' ]
#	then
#		libsl="$libsl -lresolv"
#	fi

	if [ "x$needdraw" = xtrue -a "x$WSYSTYPE" != xnowsys ]
	then
		libsl="$libsl -lgdi32 -lthread -l9"
	fi
fi
if $doautoframework
then
	ofiles=""
	for i
	do
		case "$i" in
		*.[ao])
			ofiles="$ofiles $i"
			;;
		esac
	done

	# echo "ofiles $ofiles"
	autoframeworks=""
	if [ "x$ofiles" != "x" ]
	then
		a=`
			${TOOLPFX}nm $ofiles |
			grep '__p9l_autoframework_[a-zA-Z0-9+-]*$' |
			sed 's/.*__p9l_autoframework_//' |
			sort -u
		`
		for i in $a
		do
			autoframeworks="$autoframeworks $i"
			eval "need$i=true"
		done
	fi

	if $verbose
	then
		echo "autoframeworks $autoframeworks"
	fi

	for i in $autoframeworks
	do
		eval "have$i() { false; }"
	done

	frameworks=""
	for i in $autoframeworks
	do	
		frameworks="-framework $i $frameworks"
	done
fi

#always use gcc
ld=${TOOLPFX}gcc

case $objtype in
mingw)
	startfiles=
	extralibs="-lm -lws2_32 -ladvapi32 -lmpr -lshell32 -lole32 -luuid"
	ldflags=
	;;
cygwin)
	startfiles="$MSYSdir/lib/crt0.o $MSYSdir/lib/binmode.o "
	ldflags="-mcygwin -nostartfiles"
	extralibs="-lcygwin -lc -lkernel32 -lm"
	;;
esac

if $verbose
then
	echo $ld $ldflags -L$PF9/$objtype/lib $startfiles "$@" $libsl $extralibs $frameworks
fi

xtmp=/tmp/9l.$$.$USER.out
xxout() {
	sed 's/.*: In function `[^:]*: *//' $xtmp | egrep . | 
	egrep -v 'is almost always misused|is dangerous, better use' 
	rm -f $xtmp
}

if $ld $ldflags -L$PF9/$objtype/lib $startfiles "$@" $libsl $extralibs $frameworks >$xtmp 2>&1
then
	xxout
	exit 0
else
	xxout
	rm -f $target
	exit 1
fi