dzbarsky wrote:

> I'd like to avoid changing all the tests and also potentially breaking 
> downstream users who rely on the old flag spelling. I also don't think it's 
> necessary. For example, rather than changing all instances of `-output=` to 
> `--output=`, you can simply define the option as:
> 
> ```
> def output : JoinedOrSeparate<["-", "--"], "output",
>                                [Show, Order, Overlap, Merge]>,
>              MetaVarName<"<output>">,
>              HelpText<"Output file">;
> ```

OK, I can undo that, that's what I had done originally but then changed to the 
current approach based off your comment here 
https://github.com/llvm/llvm-project/pull/177868#issuecomment-3822124153 since 
the other PRs also made similar changes. I'll revert these buts, but it would 
be great to avoid more confusion/ping-ponging here, especially given the time 
between review cycles :)

https://github.com/llvm/llvm-project/pull/177868
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