#!/bin/sh
# Demonstrate use of rpath on macosx
set -e
set -x

# Final installed location of shared libraries
LIBDIR=`pwd`/lib
rm -rf $LIBDIR
mkdir -p $LIBDIR

# Build the shared library
gcc -shared foo.c -install_name @rpath/foo.so -o foo.so
#gcc -shared foo.c -o foo.so   # this doesn't work, dyld refuses to load it via rpath
otool -D foo.so
cp foo.so $LIBDIR 

# Build the executable that uses the shared library, and show the rpath.
gcc -Wl,-rpath $LIBDIR x.c foo.so
otool -l a.out | grep -A2 RPATH

# Remove the shared library from the build area, so it can only be found in $LIBDIR
rm foo.so

# Finally, run the app and show where it found its libraries
DYLD_PRINT_LIBRARIES=1 ./a.out

# Bonus round: verify that you can use such a library without rpath, too.
# This can't work, see
# https://developer.apple.com/library/mac/documentation/developertools/conceptual/dynamiclibraries/100-Articles/RunpathDependentLibraries.html
# If you think you need it, see ../demo6, that was what I needed.
#gcc x.c $LIBDIR/foo.so
#DYLD_PRINT_LIBRARIES=1 ./a.out