how to implement --push-state/--pop-state in gold?

[Cary Coutant]

> In Debian and Ubuntu I'm getting bug reports from people trying to use
> --push-state/--pop-state and then failing with gold.  It would be nice to have
> these options available in gold as well.  Could somebody give me pointers
> where/how to implement these?
>
> Looking at the implementation in the bfd linker, I see that push/pop only
> supports one state, and not a stack.  However the documentation reads:
>
>            The --push-state allows to preserve the current state of the flags
>            which govern the input file handling so that they can all be restored
>            with one corresponding --pop-state option.
>
> which I think documents a stack of states. Should the docs be changed?

I've just pushed a commit to implement this in gold. See PR 18989.

   https://sourceware.org/bugzilla/show_bug.cgi?id=18989

Thanks for expressing an interest in working on this, but it was easy
enough to implement, so I just did it.

-cary