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How to build libobjc for OS X 10.6.8

This builds and links and work for me, but it hasn't been tested much so I don't make any guarantees.

Preparation

Create a directory where to store all the stuff. I chose /usr/local/src/darwin-10.6.8.

prepare
sudo mkdir -p /usr/local/src/darwin-10.6.8
sudo chmod 777 /usr/local/src/darwin-10.6.8

Download and Unpack

Download the following packages:

download
cd /usr/local/src/darwin-10.6.8/
curl -O http://www.opensource.apple.com/tarballs/Libc/Libc-594.9.5.tar.gz
curl -O http://www.opensource.apple.com/tarballs/dyld/dyld-132.13.tar.gz
curl -O http://www.opensource.apple.com/tarballs/libauto/libauto-141.2.tar.gz
curl -O http://www.opensource.apple.com/tarballs/libclosure/libclosure-38.tar.gz
curl -O http://www.opensource.apple.com/tarballs/libdispatch/libdispatch-84.5.5.tar.gz
curl -O http://www.opensource.apple.com/tarballs/objc4/objc4-437.3.tar.gz
curl -O http://www.opensource.apple.com/tarballs/xnu/xnu-1504.15.3.tar.gz

tar xfz Libc-594.9.5.tar.gz
tar xfz dyld-132.13.tar.gz
tar xfz libauto-141.2.tar.gz
tar xfz libclosure-38.tar.gz
tar xfz libdispatch-84.5.5.tar.gz
tar xfz objc4-437.3.tar.gz

You can also manually download stuff from http://www.opensource.apple.com/release/mac-os-x-1068/.

Installation of Headers

Copy the needed headere into /usr/local/include/darwin-10.6.8. The versioning of the destination directory is important, otherwise you might get some strange bugs later on in life.

install
sudo mkdir -p /usr/local/include/darwin-10.6.8
sudo chmod 777 /usr/local/include/darwin-10.6.8
cd /usr/local/include/darwin-10.6.8
mkdir libkern
mkdir System
mkdir System/i386
mkdir System/ppc
mkdir System/machine
mkdir mach-o

cd /usr/local/src/darwin-10.6.8

# find . -name "OSCrossEndian.h"
# find . -name "pthread_machdep.h"
# find . -name "dyld_priv.h"
# find . -name "cpu_capabilities.h"
# find . -name Block_private.h
# find . -name auto_zone.h

cp ./xnu-1504.15.3/libkern/libkern/OSCrossEndian.h /usr/local/include/darwin-10.6.8/libkern/
cp ./Libc-594.9.5/pthreads/pthread_machdep.h /usr/local/include/darwin-10.6.8/System/
cp ./dyld-132.13/include/mach-o/dyld_priv.h /usr/local/include/darwin-10.6.8/mach-o/
cp ./xnu-1504.15.3/osfmk/i386/cpu_capabilities.h /usr/local/include/darwin-10.6.8/System/i386/
cp ./xnu-1504.15.3/osfmk/ppc/cpu_capabilities.h /usr/local/include/darwin-10.6.8/System/ppc/
cp ./xnu-1504.15.3/osfmk/machine/cpu_capabilities.h /usr/local/include/darwin-10.6.8/System/machine/
cp ./libclosure-38/Block_private.h /usr/local/include/darwin-10.6.8/
cp ./libauto-141.2/auto_zone.h /usr/local/include/darwin-10.6.8/

Change the Xcode Project of objc

open objc4-437.3/*.xcodeproj

Open the project settings in Xcode and set:

  • HEADER_SEARCH_PATHS=/usr/local/include/darwin-10.6.8 $(inherited) for all Configurations
  • GCC_PREPROCESSOR_DEFINITIONS=$(inherited) PRIVATE for Debug and
  • GCC_PREPROCESSOR_DEFINITIONS=$(inherited) NDEBUG PRIVATE for Release

But this isn't good enough yet. Fix the objc target settings by prefixing $(inherited) to HEADER_SEARCH_PATHS thusly

  • HEADER_SEARCH_PATHS = $(inherited) $(DSTROOT)/usr/include/** $(DSTROOT)/usr/local/include/** $(CONFIGURATION_BUILD_DIR)/usr/include/** $<(CONFIGURATION_BUILD_DIR)/usr/local/include/**

Then you should go into the objc target's Compile sources settings and move the file objc-probes.d to the top, so that it gets compiled first.

And now it should build and link without errors.

Go ahead and trash your system with the debug linked version :)