hw-1

ld: multiple errors: archive member '/' not a mach-o file in '/Users/xxx/Desktop/libapps.a';

ld: multiple errors: archive member ‘/‘ not a mach-o file in ‘/Users/xxx/Desktop/libapps.a’;

1
2
3

using GCC instead of XCode-provided CLang
having Coreutils or Binutils in your env PATH.
Try to remove any reference from your env PATH before compiling again.