For Mach-O fat binaries that contains multiple platforms, stripping symbol may not work as you would expect.
So you have to extract the executables/libraries from Mach-O and thin it using lipo. Then you can remove the .o file you don’t like by “ar -d <.a> <.o>” or strip the symbol by “strip” which is no longer necessary.
After that, do the reverse steps to pack it back to a multiple platform Mach-O file.
Well, this post may be the last post this year.