#!/bin/sh

os=`uname`
mac=`uname -m`
opt=""
as=""
stat=""

usage() {
	sed -e 's/^.//' <<EOT
	Usage: $0 [-h] [-m cpu] [-s os]
EOT
}

longusage() {
	echo
	usage
	echo
	sed -e 's/^.//' <<EOT
	-m cpu   select target machine
	-s os    select target operating system

EOT
}

while [ "x$1" != "x" ]; do
	case $1 in
	-h)	longusage; exit ;;
	-m)	shift
		if [ "x$1" = "x" ]; then usage; exit; fi
		mac=$1
		;;
	-s)	shift
		if [ "x$1" = "x" ]; then usage; exit; fi
		os=$1
		;;
	*)	usage; exit ;;
	esac
	shift
done

if test -f src/scc0; then
	echo "You may want to run 'make clean' first."
	exit 1
fi

case $os/$mac in
FreeBSD/i386)		os=freebsd ; mac=386    ; int=32 ;;
FreeBSD/arm)		os=freebsd ; mac=armv6	; int=32 ;;
FreeBSD/amd64)		os=freebsd ; mac=x86-64 ; int=64 ;;
NetBSD/i386)		os=netbsd  ; mac=386    ; int=32 ;;
NetBSD/amd64)		os=netbsd  ; mac=x86-64 ; int=64 ;;
OpenBSD/i386)		os=openbsd ; mac=386    ; int=32 ;;
Linux/i386)		os=linux   ; mac=386    ; int=32 ;;
Linux/i686)		os=linux   ; mac=386    ; int=32 ;;
Linux/x86_64)		os=linux   ; mac=x86-64 ; int=64 ;;
MINGW32_NT-6.1/i686)	os=windows ; mac=386    ; int=32 ;;
MINGW32_NT-5.1/i686)	os=windows ; mac=386    ; int=32 ;;
Darwin/x86_64)		os=darwin  ; mac=x86-64 ; int=64 ; stat=untested
			opt="-darwin"
			;;
DOS/8086)		os=dos     ; mac=8086   ; int=16 ; stat=EXPERIMENTAL
			as=s86
			ar="sar -c"
			ranlib="sar -r"
			;;
*)			echo "Sorry, $os/$mac is currently not supported."
			exit 1
			;;
esac

if [ "$stat" != "" ]; then
	echo
	echo "WARNING: this port is "$stat"!"
	echo
fi

if [ -f "src/targets/$os-$mac/NOTE" ]; then
	if [ "$stat" = "" ]; then echo; fi
	echo NOTE:
	cat src/targets/$os-$mac/NOTE
	echo
fi

if [ $os = dos ]; then
	(cd src; ln -fs ../targets/lib/init-unix.c lib/init.c)
	(cd src; ln -fs ../targets/lib/system-dos.c lib/system.c)
	if [ "$as" != "" ]; then
		if [ ! -f src/Makefile.ORIG ]; then
			cp src/Makefile src/Makefile.ORIG
		fi
		sed	-e "s/^AS=.*/AS=	$as/" \
			-e "s/^AR=.*/AR=	$ar/" \
			-e "s/^RANLIB=.*/RANLIB=	$ranlib/" \
			<src/Makefile.ORIG >src/Makefile
	fi
elif [ $os = windows ]; then
	(cd src; ln -fs ../targets/lib/init-windows.c lib/init.c)
	(cd src; ln -fs ../targets/lib/system-windows.c lib/system.c)
else
	(cd src; ln -fs ../targets/lib/init-unix.c lib/init.c)
	(cd src; ln -fs ../targets/lib/system-unix.c lib/system.c)
fi

(cd src && ln -fs targets/cg/cg$mac$opt.c cg.c)
(cd src && ln -fs targets/cg/cg$mac.h cg.h)
(cd src && ln -fs targets/$os-$mac/sys-$os-$mac.h sys.h)
(cd src/lib && ln -fs ../targets/$os-$mac/crt0-$os-$mac.s crt0.s)
(cd src/include && ln -fs ../targets/include/limits-$int.h limits.h)

echo "Building for $os/$mac. Now cd to src and run make."