petrhosek 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">;
```
https://github.com/llvm/llvm-project/pull/177868
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