Short-opt parsing with `=`

[anmonteiro]

I don't know whether this is expected behavior, and I couldn't find it explained in this docs page.

Cmdliner currently parses doesn't special case = when parsing short optional arguments. E.g. ./my_program -a=foo will yield "=foo" as the value for a in my program. I expected this behavior to be consistent with the long option parsing, which would yield "foo" e.g. for ./my_program --long-a=foo.

[dbuenzli]

Yes that's expected. You are in the "Glued to a short name: -oa.out" (aka as POSIX convention) case of how to specify a value to an option.