#!/bin/sh
# This script adjusts some of the linkage references in Matlab's dynamically
# loadable libraries. In particular, links to libtbb and libtbbmalloc seem
# to lack the @rpath prefix, which means it is not so easy for the dynamic linker
# to find them when external code tries to link to them. 
#
# The changes to libmx, libmwfl, mwi18n and libut here seem sufficient to allow
# external code to link to and use the Matlab engine library libeng by setting
# the -rpath option to gcc/ld.
#
# The changes should not affect the normal running of Matlab.

MATLAB=$(matlab -e | grep MATLAB= | sed -e 's/MATLAB=//')
ARCH=$(matlab -e | grep ARCH= | sed -e 's/ARCH=//')
LIBDIR=$MATLAB/bin/$ARCH
SOEXT=dylib

for target in {mx,mwfl,mwi18n,ut}; do
	LIB="$LIBDIR/lib$target.$SOEXT"
	echo "About to change $LIB..."
	if [ -a "$LIB.bkp" ]; then
		echo "Backup $LIB.bkp already exists"
	else
		echo "Backing-up $LIB to $LIB.bkp"
		cp -p "$LIB" "$LIB.bkp"
	fi
	for ref in {tbb,tbbmalloc}; do
		echo "Calling:" install_name_tool -change lib$ref.$SOEXT @rpath/lib$ref.$SOEXT $LIBDIR/lib$target.$SOEXT
		install_name_tool -change lib$ref.$SOEXT @rpath/lib$ref.$SOEXT $LIBDIR/lib$target.$SOEXT
	done
done