Making GHCi object files on MacOS

Section 4.10.3 of the GHC manual tells me to use ld -r --whole-archive to convert a .a file into a .o file suitable for GHCi. However these options only work for GNU ld, which doesn't seem to be available on MacOS (uname -srv gives me "Darwin 6.8 Darwin Kernel Version 6.8: Wed Sep 10 15:20:55 PDT 2003; root:xnu/xnu-344.49.obj~2/RELEASE_PPC"). Specifically, I tried compiling the GNU binutils but got a message from its ./configure telling me that this wouldn't work for the ld directory. I presume there must be some way of producing GHCi object files on MacOS, but how is it done? Thanks