Solved by hhov in post #3 
              
              
                @xta0 Thanks for info. Besides comparing .a file sizes I also checked size as described here:https://stackoverflow.com/questions/32003262/find-size-contributed-by-each-external-library-on-ios/39593377 
Both ways gave insignificant difference. I tried also with -dead_strip but seams XCode is already …