[llvm-objcopy][MachO] Print an error message on use of unsupported options
Summary:
It is better to print an error message instead of silently ignoring unsupported options.
As mentioned in https://reviews.llvm.org/D57045, this is not the best solution and we should print which flag is not supported at some time.
Reviewers: alexshap, rupprecht, jhenderson, jakehehrlich
Reviewed By: alexshap, rupprecht, jakehehrlich
Subscribers: jakehehrlich, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D62578
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362040
91177308-0d34-0410-b5e6-
96231b3b80d8