#!/bin/sh
# Demonstrate use of -install_name on macosx to link to a library
# before it's moved into its final location
# with an intermediate DESTDIR as described at 
# http://www.gnu.org/prep/standards/html_node/DESTDIR.html
# With cmake
set -e
set -x

# Intermediate destination while preparing package

DESTDIR="`pwd`"/staging
rm -rf "$DESTDIR"

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

rm -rf btmp
mkdir btmp
cd btmp
cmake -DCMAKE_INSTALL_PREFIX:PATH="$PREFIX" -DDESTDIR:PATH="$DESTDIR" ..

# To watch what processes get executed during the make, do
#   sudo /usr/bin/newproc.d > newproc.log
# in another window.  It's very informative.

make VERBOSE=1
make install VERBOSE=1

# Now simulate the final install done later by dpkg.  Don't run this demo as root!
rm -rf "$PREFIX"
cp -a "$DESTDIR$PREFIX" "$PREFIX"

# Now do
#   grep install_name_tool newproc.log
# to see how cmake used install_name_tool.

# Compare the library in the build and the install area
echo Build area install_name:
otool -D libfoo.dylib
echo Final install area install_name:
otool -D "$LIBDIR"/libfoo.dylib

# Compare the executable in the build and the install area
echo Build area shared library references:
otool -L x
echo Final install area shared library references:
otool -L "$BINDIR"/x

# Try running the binary from the build area
# This works, since in the build area, cmake has arranged for the library's install_name to point to the build area
DYLD_PRINT_LIBRARIES=1 ./x

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

# Try running the binary from the install area
# This works, since in the install area, cmake's install machinery
# has arranged for the library's install_name to point to the install
# area, and for the executable to refer to the library in the install area.
DYLD_PRINT_LIBRARIES=1 "$BINDIR"/x