[llvm] [llvm-objcopy] Report unsupported formats before compression (PR #202357)

[via llvm-commits]

jjppp wrote:

> The other aspect of it is that you probably want the error even if there are no such sections, to show you're trying to use an option that is invalid for your environment (so that it doesn't cause surprises when the input object changes, e.g. to have debug data).

This makes sense. Will work on that!


https://github.com/llvm/llvm-project/pull/202357