Extract object (*.o) files from an iPhone static library

Question

I have a set of iPhone static libraries (a *.a file) in which I only call a few of the classes from. I have used AR in the past (with linux libraries) to extract the object files from the static library, remove the unwanted object files and rearchive.

However, when I try this with an iPhone compliled static library, I get the following error:

ar: CustomiPhoneLib.a is a fat file (use libtool(1) or lipo(1) and ar(1) on it)
ar: CustomiPhoneLib.a: Inappropriate file type or format

Does anyone know how to extract the object files from an iphone compiled static library? Doing thie could potentially reduce the final file size.

Solution

Code: ar -t mylib.a This will list all of the files in the archive.

Code: ar -xv mylib.a myobj.o This will extract the object give myobj.o from the library mylib.a.