#!/bin/sh

# gcc-uni.sh 
# ----------
# Builds a universal binary by a multi-step process to allow for individual
# options for both architectures. Its primary use is to be used as a wrapper
# for makefile based projects.
#
# If the makefile has a CC variable, this is all that should be necessary:
#
# CC=/usr/bin/gcc-uni.sh
#

# set up defaults
mode=link
output=
cmd=

# check whether to use gcc or g++
# (using a symlink with g++ in name is recommended)
if [ `echo "$0" | fgrep "g++"` ]; then
	gcc=g++
else
	gcc=gcc
fi

# which OSX to target (used for PPC)
OSX_TARGET=10.2

# which SDK to use (unused with PPC because gcc-3.3 doesn't know about it))
SDK_i386=/Developer/SDKs/MacOSX10.4u.sdk
SDK_PPC=

# i386 flags
CFLAGS_i386=" -isysroot $SDK_i386"
LDFLAGS_i386=" -isysroot $SDK_i386 -Wl,-syslibroot,$SDK_i386"

# ppc flags
CFLAGS_PPC=
LDFLAGS_PPC=

# Parse options:
#   -arch switches are ignored
#   looks for -c to enable the CFLAGS
#   looks for -o to determine the name of the output
while [ "$1" ]; do
	case $1 in
	-arch)
		shift
	;;

	-c)
		mode=compile
		cmd="$cmd -c"
	;;

	-o)
		shift
		output=$1
	;;

	*)
		cmd="$cmd $1"
	;;
	esac
	
	shift
done

# if no output, bail...
if [ "$output" = "" ]; then
	echo Error! $0 requires the -o switch.
	exit 1
fi

# figure out if we are compiling or linking
if [ "$mode" = "link" ]; then
	FLAGS_i386="$LDFLAGS_i386"
	FLAGS_PPC="$LDFLAGS_PPC"
elif [ "$mode" = "compile" ]; then
	FLAGS_i386="$CFLAGS_i386"
	FLAGS_PPC="$CFLAGS_PPC"
fi

# build the i386 version
$gcc $cmd $FLAGS_i386 -arch i386 -o $output.i386
if [ $? -ne 0 ]; then
	exit 1
fi

# build the PPC version
MACOSX_DEPLOYMENT_TARGET=$OSX_TARGET /usr/bin/$gcc-3.3 $cmd $FLAGS_PPC -arch ppc -o $output.ppc
if [ $? -ne 0 ]; then
	rm $output.i386
	exit 1 
fi

# create the universal version
lipo -create $output.i386 $output.ppc -output $output
if [ $? -ne 0 ]; then
	rm $output.i386 $output.ppc
	exit 1 
fi

# cleanup
rm $output.i386 $output.ppc